– IO \u4f18\u5316\u4e0d\u5c31\u662f\u4e0d\u5728\u4e3b\u7ebf\u7a0b\u8bfb\u5199\u5927\u6587\u4ef6\u5417\uff0c\u771f\u7684\u53ea\u6709\u8fd9\u4e48\u7b80\u5355\u5417\uff1f<\/p>\n
## IO \u57fa\u7840<\/p>\n
– IO\u6d41\u7a0b\uff1a\u5e94\u7528\u7a0b\u5e8f \u53d1\u9001\u903b\u8f91IO\u547d\u4ee4\u7ed9\u6587\u4ef6\u7cfb\u7edf\uff0c\u6587\u4ef6\u7cfb\u7edf\u53d1\u9001\u7269\u7406IO\u547d\u4ee4\u7ed9\u5b58\u50a8\u8bbe\u5907\/\u78c1\u76d8<\/p>\n
#### \u6587\u4ef6\u7cfb\u7edf<\/p>\n
– \u6587\u4ef6\u8bfb\uff08read\uff09\u8fc7\u7a0b\uff1a\u5e94\u7528\u7a0b\u5e8f\u8c03\u7528read() \u65b9\u6cd5\uff0c\u7cfb\u7edf\u4f1a\u901a\u8fc7\u4e2d\u65ad\u4ece\u7528\u6237\u7a7a\u95f4\u8fdb\u5165\u5185\u6838\u5904\u7406\u6d41\u7a0b\uff0c\u7136\u540e\u7ecf\u8fc7 VFS\u3001\u5177\u4f53\u6587\u4ef6\u7cfb\u7edf\u3001\u9875\u7f13\u5b58\uff0c\u5982\u679c\u6570\u636e\u6ca1\u6709\u5728\u9875\u7f13\u5b58\u4e2d\uff0c\u5c31\u9700\u8981\u771f\u6b63\u5411\u78c1\u76d8\u53d1\u8d77I\/O\u8bf7\u6c42
\n– \u6587\u4ef6\u7cfb\u7edf\uff1a\u5b58\u50a8\u548c\u7ec4\u7ec7\u6570\u636e\u7684\u65b9\u5f0f\uff0c\u5982iOS\u7684HFS+\uff0cAPFS\uff08Apple File System\uff0ciOS 10.3+\uff09, Android\u7684ext4\uff08Linux\u5e38\u7528\uff09\uff0cF2FS\uff08Flash-Friendly File System\uff09\uff1b<\/p>\n
“`
\n\u53ef\u4ee5\u5728 \/proc\/filesystems \u770b\u5230\u7cfb\u7edf\u53ef\u4ee5\u8bc6\u522b\u7684\u6240\u6709\u6587\u4ef6\u7cfb\u7edf\u7684\u5217\u8868
\n“`<\/p>\n
– \u865a\u62df\u6587\u4ef6\u7cfb\u7edf\uff08VFS\uff09\uff1a\u5c4f\u853d\u5177\u4f53\u7684\u6587\u4ef6\u7cfb\u7edf\uff0c\u4e3a\u5e94\u7528\u7a0b\u5e8f\u7684\u64cd\u4f5c\u63d0\u4f9b\u7edf\u4e00\u7684\u63a5\u53e3;
\n– \u9875\u7f13\u5b58\uff08Page Cache\uff09: \u6587\u4ef6\u7cfb\u7edf\u5bf9\u6570\u636e\u7684\u7f13\u5b58\uff0c\u76ee\u7684\u662f\u63d0\u5347\u5185\u5b58\u547d\u4e2d\u7387;
\n– Buffer Cache : \u78c1\u76d8\u5bf9\u6570\u636e\u7684\u7f13\u5b58\uff0c\u76ee\u7684\u662f\u5408\u5e76\u90e8\u5206\u6587\u4ef6\u7cfb\u7edf\u7684 I\/O \u8bf7\u6c42\u3001\u964d\u4f4e\u78c1\u76d8 I\/O \u7684\u6b21\u6570, \u540e\u6765\u5b83\u4e5f\u5408\u5e76\u5230 Page Cache \u4e2d\u7684 Buffer Page \u4e86;<\/p>\n
“`
\n\u901a\u8fc7 \/proc\/meminfo \u6587\u4ef6\u53ef\u4ee5\u67e5\u770b\u7f13\u5b58\u7684\u5185\u5b58\u5360\u7528\u60c5\u51b5
\n“`<\/p>\n
– \u5f53\u624b\u673a\u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u7cfb\u7edf\u4f1a\u56de\u6536\u5b83\u4eec\u7684\u5185\u5b58\uff0c\u8fd9\u6837\u6574\u4f53 I\/O \u7684\u6027\u80fd\u5c31\u4f1a\u6709\u6240\u964d\u4f4e\u3002<\/p>\n
#### \u78c1\u76d8<\/p>\n
– \u78c1\u76d8\uff1a\u7cfb\u7edf\u7684\u5b58\u50a8\u8bbe\u5907\uff0c\u5982CD, \u673a\u68b0\u786c\u76d8, SSD \u56fa\u6001\u786c\u76d8\uff1b
\n– \u78c1\u76d8IO\u8fc7\u7a0b\uff1a\u5148\u7ecf\u8fc7\u5185\u6838\u7684\u901a\u7528\u5757\u5c42\u3001I\/O \u8c03\u5ea6\u5c42\u3001\u8bbe\u5907\u9a71\u52a8\u5c42\uff0c\u6700\u540e\u4ea4\u7ed9\u5177\u4f53\u7684\u786c\u4ef6\u8bbe\u5907\u5904\u7406\uff1b
\n– \u5757\u8bbe\u5907\uff1a\u7cfb\u7edf\u4e2d\u80fd\u591f\u968f\u673a\u8bbf\u95ee\u56fa\u5b9a\u5927\u5c0f\u6570\u636e\u5757\uff08block\uff09\u7684\u8bbe\u5907\uff0cCD\u3001\u786c\u76d8\u3001SSD\u90fd\u5c5e\u4e8e\u5757\u8bbe\u5907\uff1b
\n– \u901a\u7528\u5757\u5c42\uff1a\u4e3b\u8981\u4f5c\u7528\u662f\u63a5\u6536\u4e0a\u5c42\u53d1\u51fa\u7684\u78c1\u76d8\u8bf7\u6c42\uff0c\u5e76\u6700\u7ec8\u53d1\u51fa I\/O \u8bf7\u6c42\uff0c\u8ba9\u4e0a\u5c42\u4e0d\u9700\u8981\u5173\u5fc3\u5e95\u5c42\u786c\u4ef6\u8bbe\u5907\u7684\u5177\u4f53\u5b9e\u73b0\u3002
\n– I\/O \u8c03\u5ea6\u5c42\uff1a\u6839\u636e\u8bbe\u7f6e\u7684\u8c03\u5ea6\u7b97\u6cd5\u5bf9\u8bf7\u6c42\u5408\u5e76\u548c\u6392\u5e8f<\/p>\n
“`
\nI\/O \u8c03\u5ea6\u5c42 \u5173\u952e\u53c2\u6570\uff1a
\n\/sys\/block\/[disk]\/queue\/nr_requests \/\/ \u961f\u5217\u957f\u5ea6\uff0c\u4e00\u822c\u662f 128\u3002
\n\/sys\/block\/[disk]\/queue\/scheduler \/\/ \u8c03\u5ea6\u7b97\u6cd5
\n“`<\/p>\n
– \u5757\u8bbe\u5907\u9a71\u52a8\u5c42: \u636e\u5177\u4f53\u7684\u7269\u7406\u8bbe\u5907\uff0c\u9009\u62e9\u5bf9\u5e94\u7684\u9a71\u52a8\u7a0b\u5e8f\u901a\u8fc7\u64cd\u63a7\u786c\u4ef6\u8bbe\u5907\u5b8c\u6210\u6700\u7ec8\u7684 I\/O \u8bf7\u6c42\u3002\u5982\u5149\u76d8\u7684\u6fc0\u5149\u70e7\u5f55\uff0c\u95ea\u5b58\u7684\u7535\u5b50\u64e6\u5199\uff1b<\/p>\n
## Android I\/O<\/p>\n
#### Android \u95ea\u5b58\uff08ROM\uff09<\/p>\n
– Android\u524d\u51e0\u5e74\u7684eMMC \u6807\u51c6\uff0c\u8fd1\u51e0\u5e74\u7684UFS 2.0\/2.1 \u6807\u51c6\uff0ciOS\u548cMacOS\u7684NVMe \u534f\u8bae
\n– \u95ea\u5b58\u6027\u80fd\u4e0d\u4ec5\u4ec5\u7531\u786c\u4ef6\u51b3\u5b9a\uff0c\u5b83\u8ddf\u91c7\u7528\u7684\u6807\u51c6\u3001\u6587\u4ef6\u7cfb\u7edf\u7684\u5b9e\u73b0\u4e5f\u6709\u5f88\u5927\u7684\u5173\u7cfb<\/p>\n
###### \u6587\u4ef6\u4e3a\u4ec0\u4e48\u4f1a\u635f\u574f\uff1f<\/p>\n
– \u683c\u5f0f\u9519\u8bef\u6216\u5185\u5bb9\u4e22\u5931\uff0c\u5982SQLite\u5927\u6982\u6709\u51e0\u4e07\u5206\u4e4b\u4e00\u7684\u635f\u574f\u7387\uff0cSharedPreference \u9891\u7e41\u8de8\u8fdb\u7a0b\u8bfb\u5199\u4e5f\u4f1a\u6709\u4e07\u5206\u4e4b\u4e00\u7684\u635f\u574f\u7387;
\n– \u4ece\u5e94\u7528\u7a0b\u5e8f\u3001\u6587\u4ef6\u7cfb\u7edf\u548c\u78c1\u76d8\u4e09\u4e2a\u89d2\u5ea6\u6765\u5ba1\u89c6\uff1a<\/p>\n
“`
\n1. \u78c1\u76d8\u3002\u624b\u673a\u4e0a\u4f7f\u7528\u7684\u95ea\u5b58\u662f\u7535\u5b50\u5f0f\u7684\u5b58\u50a8\u8bbe\u5907\uff0c\u6240\u4ee5\u5728\u8d44\u6599\u4f20\u8f93\u8fc7\u7a0b\u53ef\u80fd\u4f1a\u53d1\u751f\u7535\u5b50\u9057\u5931
\n\u7b49\u73b0\u8c61\u5bfc\u81f4\u6570\u636e\u9519\u8bef\u3002\u4e0d\u8fc7\u95ea\u5b58\u4e5f\u4f1a\u4f7f\u7528 ECC\u3001\u591a\u7ea7\u7f16\u7801\u7b49\u591a\u79cd\u65b9\u5f0f\u589e\u52a0\u6570\u636e\u7684\u53ef\u9760\u6027\uff0c\u4e00
\n\u822c\u6765\u8bf4\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\u7684\u53ef\u80fd\u6027\u4e5f\u6bd4\u8f83\u5c0f\u3002
\n\u95ea\u5b58\u5bff\u547d\u4e5f\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u9519\u8bef\uff0c\u7531\u4e8e\u95ea\u5b58\u7684\u5185\u90e8\u7ed3\u6784\u548c\u7279\u5f81\uff0c\u5bfc\u81f4\u5b83\u5199\u8fc7\u7684\u5730\u5740\u5fc5\u987b\u64e6\u9664\u624d
\n\u80fd\u518d\u6b21\u5199\u5165\uff0c\u800c\u6bcf\u4e2a\u5757\u64e6\u9664\u53c8\u6709\u6b21\u6570\u9650\u5236\uff0c\u6b21\u6570\u9650\u5236\u662f\u6839\u636e\u91c7\u7528\u7684\u5b58\u50a8\u9897\u7c92\uff0c\u4ece\u5341\u4e07\u6b21\u5230\u51e0\u5343
\n\u90fd\u6709\uff08SLC>MLC>TLC\uff09
\n2. \u6587\u4ef6\u7cfb\u7edf\u3002\u867d\u8bf4\u5185\u6838\u5d29\u6e83\u6216\u8005\u7cfb\u7edf\u7a81\u7136\u65ad\u7535\u90fd\u6709\u53ef\u80fd\u5bfc\u81f4\u6587\u4ef6\u7cfb\u7edf\u635f\u574f\uff0c\u6587\u4ef6\u7cfb\u7edf\u628a\u6570\u636e
\n\u5199\u5165\u5230 Page Cache \u4e2d\uff0c\u7136\u540e\u7b49\u5f85\u5408\u9002\u7684\u65f6\u673a\u624d\u4f1a\u771f\u6b63\u7684\u5199\u5165\u78c1\u76d8.\u4e0d\u8fc7\u6587\u4ef6\u7cfb\u7edf\u4e5f\u505a\u4e86\u5f88
\n\u591a\u7684\u4fdd\u62a4\u63aa\u65bd\u3002\u4f8b\u5982 system \u5206\u533a\u4fdd\u8bc1\u53ea\u8bfb\u4e0d\u53ef\u5199\uff0c\u589e\u52a0\u5f02\u5e38\u68c0\u67e5\u548c\u6062\u590d\u673a\u5236\uff0cext4 \u7684
\nfsck\u3001f2fs \u7684 fsck.f2fs \u548c checkpoint \u673a\u5236\u7b49\u3002
\n3. \u5e94\u7528\u7a0b\u5e8f\u3002\u5927\u90e8\u5206\u7684 I\/O \u65b9\u6cd5\u90fd\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c\uff0c\u6587\u4ef6\u7684\u8de8\u8fdb\u7a0b\u6216\u8005\u591a\u7ebf\u7a0b\u5199\u5165\u3001\u4f7f\u7528\u4e00
\n\u4e2a\u5df2\u7ecf\u5173\u95ed\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 fd \u6765\u64cd\u4f5c\u6587\u4ef6\uff0c\u5b83\u4eec\u90fd\u6709\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u88ab\u8986\u76d6\u6216\u8005\u5220\u9664\u3002\u4e8b\u5b9e\u4e0a\uff0c
\n\u5927\u90e8\u5206\u7684\u6587\u4ef6\u635f\u574f\u90fd\u662f\u56e0\u4e3a\u5e94\u7528\u7a0b\u5e8f\u4ee3\u7801\u8bbe\u8ba1\u8003\u8651\u4e0d\u5f53\u5bfc\u81f4\u7684\uff0c\u5e76\u4e0d\u662f\u6587\u4ef6\u7cfb\u7edf\u6216\u8005\u78c1\u76d8\u7684\u95ee\u9898\u3002
\n“`<\/p>\n
###### I\/O \u6709\u65f6\u5019\u4e3a\u4ec0\u4e48\u4f1a\u7a81\u7136\u5f88\u6162\uff1f<\/p>\n
1. \u5185\u5b58\u4e0d\u8db3\uff1a\u5185\u5b58\u4e0d\u8db3\u7684\u65f6\u5019\uff0c\u7cfb\u7edf\u4f1a\u56de\u6536 Page Cache \u548c Buffer Cache \u7684\u5185\u5b58\uff0c\u5927\u90e8\u5206\u7684\u5199\u64cd\u4f5c\u4f1a\u76f4\u63a5\u843d\u76d8\uff0c\u5bfc\u81f4\u6027\u80fd\u4f4e\u4e0b\uff1b
\n2. \u5199\u5165\u653e\u5927\uff1a\u95ea\u5b58\u91cd\u590d\u5199\u5165\u9700\u8981\u5148\u8fdb\u884c\u64e6\u9664\uff0c\u64e6\u9664\u64cd\u4f5c\u7684\u57fa\u672c\u5355\u5143\u662f block \u5757\uff0c\u4e00\u4e2a page \u9875\u7684\u5199\u5165\u64cd\u4f5c\u5c06\u4f1a\u5f15\u8d77\u6574\u4e2a\u5757\u6570\u636e\u7684\u8fc1\u79fb\uff0c\u8fd9\u5c31\u662f\u5178\u578b\u7684\u5199\u5165\u653e\u5927\u73b0\u8c61\uff0c\u4f4e\u7aef\u673a\u6216\u8005\u4f7f\u7528\u6bd4\u8f83\u4e45\u7684\u8bbe\u5907\uff0c\u7531\u4e8e\u78c1\u76d8\u788e\u7247\u591a\u3001\u5269\u4f59\u7a7a\u95f4\u5c11\uff0c\u975e\u5e38\u5bb9\u6613\u51fa\u73b0\u5199\u5165\u653e\u5927\u7684\u73b0\u8c61\u3002
\n3. \u914d\u7f6e\u4e0d\u591f\uff1a\u4f4e\u7aef\u673a\u7684 CPU \u548c\u95ea\u5b58\u7684\u6027\u80fd\u76f8\u5bf9\u4e5f\u8f83\u5dee\uff0c\u5728\u9ad8\u8d1f\u8f7d\u7684\u60c5\u51b5\u4e0b\u5bb9\u6613\u51fa\u73b0\u74f6\u9888\u3002<\/p>\n
#### I\/O \u7684\u6027\u80fd\u8bc4\u4f30<\/p>\n
– \u6574\u4e2aIO\u6d41\u7a0b\uff1a\u5e94\u7528\u7a0b\u5e8f–>\u7cfb\u7edf\u8c03\u7528–>\u865a\u62df\u6587\u4ef6\u7cfb\u7edf–>\u6587\u4ef6\u7cfb\u7edf–>\u5757\u8bbe\u5907\u63a5\u53e3–>\u9a71\u52a8\u7a0b\u5e8f–>\u78c1\u76d8<\/p>\n
– I\/O \u6027\u80fd\u6307\u6807: \u541e\u5410\u91cf \u548c IOPS<\/p>\n
– \u78c1\u76d8\u541e\u5410\u91cf\uff1a\u6bcf\u79d2\u78c1\u76d8I\/O\u7684\u6d41\u91cf\uff0c\u5373\u78c1\u76d8\u5199\u5165\u52a0\u4e0a\u8bfb\u51fa\u7684\u6570\u636e\u7684\u5927\u5c0f\u3002
\n – \u5b58\u50a8IOPS\uff1a\u78c1\u76d8IOPS\u662f\u6307\u4e00\u79d2\u5185\u78c1\u76d8\u8fdb\u884c\u591a\u5c11\u6b21I\/O\u8bfb\u5199\uff1b<\/p>\n
– I\/O \u6d4b\u91cf:<\/p>\n
“`
\nproc\/self\/schedstat:
\nse.statistics.iowait_count\uff1aIO \u7b49\u5f85\u7684\u6b21\u6570
\nse.statistics.iowait_sum\uff1a IO \u7b49\u5f85\u7684\u65f6\u95f4
\n\/\/\u5982\u679c\u662f root \u7684\u673a\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u5f00\u542f\u5185\u6838\u7684 I\/O \u76d1\u63a7\uff0c\u5c06\u6240\u6709 block \u8bfb\u5199 dump \u5230\u65e5\u5fd7\u6587\u4ef6\u4e2d\uff0c\u8fd9\u6837\u53ef\u4ee5\u901a\u8fc7 dmesg \u547d\u4ee4\u6765\u67e5\u770b\u3002
\necho 1 > \/proc\/sys\/vm\/block_dump
\ndmesg -c grep pid
\n.sample.io.test(7540): READ block 29262592 on dm-1 (256 sectors)
\n.sample.io.test(7540): READ block 29262848 on dm-1 (256 sectors)<\/p>\n
strace -ttT -f -p [pid]
\nread(53, “*****************”\\.\\.\\., 1024) = 1024 <0.000447>
\nread(53, “*****************”\\.\\.\\., 1024) = 1024 <0.000084>
\nread(53, “*****************”\\.\\.\\., 1024) = 1024 <0.000059>
\n\/\/\u4e5f\u53ef\u4ee5\u901a\u8fc7 strace \u7edf\u8ba1\u4e00\u6bb5\u65f6\u95f4\u5185\u6240\u6709\u7cfb\u7edf\u8c03\u7528\u7684\u8017\u65f6\u6982\u51b5\u3002\u4e0d\u8fc7 strace \u672c\u8eab\u4e5f\u4f1a\u6d88\u8017\u4e0d\u5c11\u8d44\u6e90\uff0c\u5bf9\u6267\u884c\u65f6\u95f4\u4e5f\u4f1a\u4ea7\u751f\u5f71\u54cd\u3002
\nstrace -c -f -p [pid]<\/p>\n
% time seconds usecs\/call calls errors syscall
\n—— ———– ———– ——— ——— —————-
\n97.56 0.041002 21 1987 read
\n1.44 0.000605 55 11 write<\/p>\n
\/\/\u5176\u4e2d Memory \u4e2d\u7684 buff \u548c cache\uff0cI\/O \u4e2d\u7684 bi \u548c bo\uff0cSystem \u4e2d\u7684 cs\uff0c\u4ee5\u53ca CPU \u4e2d\u7684 sy \u548c wa\uff0c\u8fd9\u4e9b\u5b57\u6bb5\u7684\u6570\u503c\u90fd\u4e0e I\/O \u884c\u4e3a\u6709\u5173\u3002
\n\/\/\u6211\u4eec\u53ef\u4ee5\u914d\u5408dd \u547d\u4ee4\u6765\u914d\u5408\u6d4b\u8bd5\uff0c\u89c2\u5bdf vmstat \u7684\u8f93\u51fa\u6570\u636e\u53d8\u5316\u3002\u4e0d\u8fc7\u9700\u8981\u6ce8\u610f\u7684\u662f Android \u91cc\u9762\u7684 dd \u547d\u4ee4\u4f3c\u4e4e\u5e76\u4e0d\u652f\u6301 conv \u548c flag \u53c2\u6570<\/p>\n
\/\/\u6e05\u9664Buffer\u548cCache\u5185\u5b58\u7f13\u5b58
\necho 3 > \/proc\/sys\/vm\/drop_caches
\n\/\/\u6bcf\u96941\u79d2\u8f93\u51fa1\u7ec4vmstat\u6570\u636e
\nvmstat 1
\n\/\/\u6d4b\u8bd5\u5199\u5165\u901f\u5ea6\uff0c\u5199\u5165\u6587\u4ef6\/data\/data\/test\uff0cbuffer\u5927\u5c0f\u4e3a4K\uff0c\u6b21\u6570\u4e3a1000\u6b21
\ndd if=\/dev\/zero of=\/data\/data\/test bs=4k count=1000
\n“`<\/p>\n
1. \u4f7f\u7528 vmstat
\n 2. \u4f7f\u7528 strace \u8ddf\u8e2a I\/O \u76f8\u5173\u7684\u7cfb\u7edf\u8c03\u7528\u6b21\u6570\u548c\u8017\u65f6
\n 3. \u4f7f\u7528 proc \u8ddf\u8e2a I\/O \u7684\u7b49\u5f85\u65f6\u95f4\u548c\u6b21\u6570\u6765\u8861\u91cf<\/p>\n
#### IO\u7684\u4e09\u79cd\u65b9\u5f0f<\/p>\n
###### 1. \u6807\u51c6IO<\/p>\n
– \u7a0b\u5e8f\u4e2d\u5e73\u65f6\u7528\u5230 read\/write \u64cd\u4f5c\u90fd\u5c5e\u4e8e\u6807\u51c6 I\/O\uff0c\u4e5f\u5c31\u662f\u7f13\u5b58 I\/O\uff08Buffered I\/O\uff09
\n– \u7f13\u5b58 I\/O \u53ef\u4ee5\u5f88\u5927\u7a0b\u5ea6\u51cf\u5c11\u771f\u6b63\u8bfb\u5199\u78c1\u76d8\u7684\u6b21\u6570\uff0c\u4ece\u800c\u63d0\u5347\u6027\u80fd\uff0c\u4f46\u5ef6\u8fdf\u5199\u673a\u5236\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e22\u5931\uff1b
\n– Page Cache \u4e2d\u88ab\u4fee\u6539\u7684\u5185\u5b58\u79f0\u4e3a\u201c\u810f\u9875\u201d\uff0c\u5185\u6838\u901a\u8fc7 flush \u7ebf\u7a0b\u5b9a\u671f\u5c06\u6570\u636e\u5199\u5165\u78c1\u76d8\u3002<\/p>\n
“`
\n\/\/\u5177\u4f53\u5199\u5165\u7684\u6761\u4ef6\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 \/proc\/sys\/vm \u6587\u4ef6\u6216\u8005 sysctl -a | grep vm \u547d\u4ee4\u5f97\u5230<\/p>\n
\/\/ flush\u6bcf\u96945\u79d2\u6267\u884c\u4e00\u6b21
\nvm.dirty_writeback_centisecs = 500
\n\/\/ \u5185\u5b58\u4e2d\u9a7b\u755930\u79d2\u4ee5\u4e0a\u7684\u810f\u6570\u636e\u5c06\u7531flush\u5728\u4e0b\u4e00\u6b21\u6267\u884c\u65f6\u5199\u5165\u78c1\u76d8
\nvm.dirty_expire_centisecs = 3000
\n\/\/ \u6307\u793a\u82e5\u810f\u9875\u5360\u603b\u7269\u7406\u5185\u5b5810\uff05\u4ee5\u4e0a\uff0c\u5219\u89e6\u53d1flush\u628a\u810f\u6570\u636e\u5199\u56de\u78c1\u76d8
\nvm.dirty_background_ratio = 10
\n\/\/ \u7cfb\u7edf\u6240\u80fd\u62e5\u6709\u7684\u6700\u5927\u810f\u9875\u7f13\u5b58\u7684\u603b\u5927\u5c0f
\nvm.dirty_ratio = 20
\n“`<\/p>\n
– \u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5982\u679c\u67d0\u4e9b\u6570\u636e\u6211\u4eec\u89c9\u5f97\u975e\u5e38\u91cd\u8981\uff0c\u662f\u5b8c\u5168\u4e0d\u5141\u8bb8\u6709\u4e22\u5931\u98ce\u9669\u7684\uff0c\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u5e94\u8be5\u91c7\u7528\u540c\u6b65\u5199\u673a\u5236\u3002
\n– \u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u4f7f\u7528 sync\u3001fsync\u3001msync \u7b49\u7cfb\u7edf\u8c03\u7528\u65f6\uff0c\u5185\u6838\u90fd\u4f1a\u7acb\u523b\u5c06\u76f8\u5e94\u7684\u6570\u636e\u5199\u56de\u5230\u78c1\u76d8\u3002<\/p>\n
###### 2. \u76f4\u63a5 I\/O<\/p>\n
– \u5f88\u591a\u6570\u636e\u5e93\u81ea\u5df1\u5df2\u7ecf\u505a\u4e86\u6570\u636e\u548c\u7d22\u5f15\u7684\u7f13\u5b58\u7ba1\u7406\uff0c\u5bf9\u9875\u7f13\u5b58\u7684\u4f9d\u8d56\u53cd\u800c\u6ca1\u90a3\u4e48\u5f3a\u70c8\u3002\u5b83\u4eec\u5e0c\u671b\u53ef\u4ee5\u7ed5\u5f00\u9875\u7f13\u5b58\u673a\u5236\uff0c\u8fd9\u6837\u53ef\u4ee5\u51cf\u5c11\u4e00\u6b21\u6570\u636e\u62f7\u8d1d\uff0c\u8fd9\u4e9b\u6570\u636e\u4e5f\u4e0d\u4f1a\u6c61\u67d3\u9875\u7f13\u5b58\u3002
\n– \u8bfb\/\u5199\u5747\u4e3a\u540c\u6b65\u6267\u884c\uff0c\u5bb9\u6613\u5bfc\u81f4\u7a0b\u5e8f\u7b49\u5f85
\n– \u53ea\u6709\u5728\u786e\u5b9a\u7f13\u51b2IO\u5f00\u9500\u975e\u5e38\u5de8\u5927\u65f6\u624d\u8003\u8651\u76f4\u63a5IO<\/p>\n
###### 3. mmap<\/p>\n
– Android\u7cfb\u7edf\u542f\u52a8\u52a0\u8f7ddex\u65f6\uff0c\u4e0d\u4f1a\u628a\u6574\u4e2a\u6587\u4ef6\u4e00\u6b21\u6027\u8bfb\u5230\u5185\u5b58\uff0c\u800c\u662f\u91c7\u7528mmap()\uff1b
\n– \u901a\u8fc7\u628a\u6587\u4ef6\u6620\u5c04\u5230\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\uff08\u7528\u6237\u7f13\u51b2\u533a\u4e0e\u7269\u7406\u5185\u5b58\uff08\u9875\u7f13\u5b58\uff09\u5171\u4eab\u6570\u636e\uff0c\uff09
\n– \u4f18\u70b9\uff1a
\n 1. \u51cf\u5c11\u7cfb\u7edf\u8c03\u7528\uff1a\u53ea\u9700\u4e00\u6b21mmap()\u7cfb\u7edf\u8c03\u7528\uff0c\u540e\u7eed\u6240\u6709\u8c03\u7528\u5c31\u50cf\u64cd\u4f5c\u5185\u5b58\u4e00\u6837\uff0c\u4e0d\u4f1a\u51fa\u73b0\u5927\u91cfread\/write\u7cfb\u7edf\u8c03\u7528
\n 2. \u51cf\u5c11\u6570\u636e\u62f7\u8d1d\uff1a\u666e\u901aread\u9700\u8981\u4e24\u5c3a\u62f7\u8d1d\uff08\u78c1\u76d8to\u9875\u7f13\u5b58\uff0c\u9875\u7f13\u5b58to\u7528\u6237\u7f13\u51b2\u533a\uff09\uff0cmmap\u53ea\u9700\u8981\u5c06\u78c1\u76d8\u6570\u636e\u62f7\u8d1d\u5230\u9875\u7f13\u5b58\uff1b
\n 3. \u53ef\u9760\u6027\u9ad8\uff1ammap\u628a\u6570\u636e\u5199\u5165\u9875\u7f13\u5b58\u540e\uff0c\u8ddf\u7f13\u5b58IO\u7684\u5ef6\u8fdf\u5199\u673a\u5236\u4e00\u6837\uff0c\u53ef\u4ee5\u4f9d\u9760\u5185\u6838\u7ebf\u7a0b\u5b9a\u671f\u5199\u56de\u78c1\u76d8\uff1b
\n 4. \u9002\u5408\u5bf9\u540c\u4e00\u5757\u533a\u57df\u9891\u7e41\u8bfb\u5199\u7684\u60c5\u51b5\uff0c\u5982\u7528\u6237\u65e5\u5fd7\uff0c\u6570\u636e\u4e0a\u62a5
\n 5. \u8de8\u8fdb\u7a0b\u540c\u6b65\u65f6mmap\u4e5f\u662f\u4e2a\u5f88\u597d\u7684\u9009\u62e9\uff0cAndroid\u4e2d\u7684binder\u673a\u5236\u5185\u90e8\u4e5f\u662f\u4f7f\u7528mmap\u5b9e\u73b0
\n– \u7f3a\u70b9\uff1a
\n 1. mmap\u5728\u5185\u6838\u5d29\u6e83\uff0c\u7a81\u7136\u65ad\u7535\u7b49\u60c5\u51b5\u4e0b\u4e5f\u53ef\u80fd\u5f15\u8d77\u5185\u5bb9\u4e22\u5931\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528msync\u6765\u5f3a\u5236\u540c\u6b65\u5199\uff1b
\n 2. \u865a\u62df\u5185\u5b58\u589e\u5927\uff1a\u5e94\u7528\u53ef\u7528\u7684\u9700\u5185\u5185\u5b58\u7a7a\u95f4\u6709\u9650\uff0cmmap\u4e00\u4e2a\u5927\u6587\u4ef6\u5bb9\u6613\u51fa\u73b0\u865a\u62df\u5185\u5b58\u4e0d\u8db3\u5bfc\u81f4\u7684OOM\uff1b
\n 3. \u78c1\u76d8\u5ef6\u8fdf\uff1ammap\u901a\u8fc7\u7f3a\u9875\u4e2d\u65ad\u5411\u78c1\u76d8\u53d1\u8d77\u771f\u6b63\u7684\u78c1\u76d8IO\uff0c\u6240\u4ee5\u5982\u679c\u5f53\u524d\u95ee\u9898\u5728\u4e8e\u78c1\u76d8IO\u7684\u9ad8\u5ef6\u8fdf\uff0c\u90a3\u4e48mmap\u6d88\u9664\u5c0f\u5c0f\u7684\u7cfb\u7edf\u8c03\u7528\u5f00\u9500\u771f\u662f\u676f\u6c34\u8f66\u85aa\uff1b\u4e4b\u524d\u8bb2\u8fc7\u7684\u7c7b\u91cd\u6392\u6280\u672f\u4e3b\u8981\u5c31\u662f\u4e3a\u4e86\u51cf\u5c11\u7f3a\u9875\u4e2d\u65ad\u9020\u6210\u7684\u78c1\u76d8IO\u5ef6\u8fdf\uff1b
\n 4. \u4f4e\u7aef\u673a\u6216\u7cfb\u7edf\u8d44\u6e90\u4e25\u91cd\u4e0d\u8db3\u65f6\uff0cmmap\u4e5f\u4f1a\u51fa\u73b0\u9891\u7e41\u5199\u5165\u78c1\u76d8\uff0c\u6027\u80fd\u5feb\u901f\u4e0b\u964d\uff1b<\/p>\n
#### \u591a\u7ebf\u7a0b\u963b\u585eIO\u548cNIO<\/p>\n
###### \u591a\u7ebf\u7a0b\u963b\u585eIO<\/p>\n
– IO\u64cd\u4f5c\u53ef\u80fd\u5f88\u6162\uff0c\u6240\u4ee5\u5e94\u8be5\u5c3d\u91cf\u653e\u5230\u7ebf\u7a0b\u4e2d\uff1b
\n– \u6587\u4ef6\u8bfb\u5199\u6536\u5230IO\u6027\u80fd\u74f6\u9888\u7684\u5f71\u54cd\uff0c\u5230\u8fbe\u4e00\u5b9a\u901f\u5ea6\u540e\u6574\u4f53\u6027\u80fd\u5c31\u4f1a\u6536\u5230\u660e\u663e\u5f71\u54cd\uff0c\u8fc7\u591a\u7684\u7ebf\u7a0b\u53cd\u800c\u4f1a\u5bfc\u81f4\u5e94\u7528\u6574\u4f53\u6027\u80fd\u7684\u4e0b\u964d
\n– \u5408\u7406\u4f7f\u7528\u591a\u7ebf\u7a0b\u53ef\u4ee5\u51cf\u5c11IO\u7b49\u5f85\uff0c\u592a\u591a\u7684\u7ebf\u7a0b\u963b\u585e\u5bfc\u81f4\u7ebf\u7a0b\u5207\u6362\u9891\u7e41\uff0c\u589e\u5927\u7cfb\u7edf\u4e0a\u4e0b\u6587\u5207\u6362\u7684\u5f00\u9500\uff1b
\n– \u5b9e\u9645\u5de5\u4f5c\u5f00\u53d1\u4e2d\u5927\u90e8\u5206\u65f6\u5019\u90fd\u662f\u8bfb\u4e00\u4e9b\u6bd4\u8f83\u5c0f\u7684\u6587\u4ef6\uff0c\u4f7f\u7528\u5355\u72ec\u7684IO\u7ebf\u7a0b\u8fd8\u662f\u4e13\u95e8\u65b0\u5f00\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5176\u5b9e\u5dee\u522b\u4e0d\u5927\uff1b<\/p>\n
###### NIO<\/p>\n
– \u4f7f\u7528\u5f02\u6b65IO\uff0c\u5c06IO\u8bf7\u6c42\u53d1\u9001\u7ed9\u7cfb\u7edf\u540e\uff0c\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c\uff0c\u5c06IO\u4ee5\u4e8b\u4ef6\u7684\u65b9\u5f0f\u901a\u77e5\uff0c\u51cf\u5c11\u7ebf\u7a0b\u5207\u6362\u7684\u5f00\u9500\uff1b
\n– \u7f3a\u70b9\uff1a\u5e94\u7528\u7a0b\u5e8f\u7684\u5b9e\u73b0\u53d8\u5f97\u66f4\u590d\u6742\uff0c\u6709\u65f6\u5f02\u6b65\u6539\u9020\u5e76\u4e0d\u5bb9\u6613
\n– \u4f5c\u7528\uff1a\u6700\u5927\u4f5c\u7528\u4e0d\u662f\u51cf\u5c11\u8bfb\u53d6\u6587\u4ef6\u7684\u8017\u65f6\uff0c\u800c\u662f\u6700\u5927\u5316\u63d0\u5347\u5e94\u5458\u5de5\u6574\u4f53\u7684CPU\u5229\u7528\u7387\uff1b(\u5c06\u7ebf\u7a0b\u7b49\u5f85\u78c1\u76d8IO\u7684\u65f6\u95f4\u7528\u6765\u5904\u7406cpu\u7684\u5176\u4ed6\u4efb\u52a1)
\n– \u63a8\u8350\u4f7f\u7528Square \u7684Okio\uff0c\u652f\u6301\u540c\u6b65\u548c\u5f02\u6b65 I\/O\uff1b\u4f7f\u7528demo\u5982\u4e0b\uff1a<\/p>\n
“`
\n\/\/Okio\u4e2d\u6709\u4e24\u4e2a\u5173\u952e\u7684\u63a5\u53e3\uff0cSink\u548cSource\uff0c\u8fd9\u4e24\u4e2a\u63a5\u53e3\u90fd\u7ee7\u627f\u4e86Closeable\u63a5\u53e3\uff1b
\n\/\/\u800cSink\u53ef\u4ee5\u7b80\u5355\u7684\u770b\u505aOutputStream\uff0cSource\u53ef\u4ee5\u7b80\u5355\u7684\u770b\u505aInputStream\u3002
\n\/\/\u800c\u8fd9\u4e24\u4e2a\u63a5\u53e3\u90fd\u662f\u652f\u6301\u8bfb\u5199\u8d85\u65f6\u8bbe\u7f6e\u7684
\n\/\/1. BufferedSink\u4e2d\u5b9a\u4e49\u4e86\u4e00\u7cfb\u5217\u5199\u5165\u7f13\u5b58\u533a\u7684\u65b9\u6cd5
\nBufferedSink write(byte[] source) \u5c06\u5b57\u7b26\u6570\u7ec4source \u5199\u5165
\nBufferedSink write(byte[] source, int offset, int byteCount) \u5c06\u5b57\u7b26\u6570\u7ec4\u7684\u4eceoffset\u5f00\u59cb\u7684byteCount\u4e2a\u5b57\u7b26\u5199\u5165
\nBufferedSink write(ByteString byteString) \u5c06\u5b57\u7b26\u4e32\u5199\u5165
\nBufferedSink write(Source source, long byteCount) \u4eceSource\u5199\u5165byteCount\u4e2a\u957f\u5ea6\u7684
\nlong writeAll(Source source) \u5c06Source\u4e2d\u7684\u6240\u6709\u6570\u636e\u5199\u5165
\nBufferedSink writeByte(int b) \u5199\u5165\u4e00\u4e2abyte\u6574\u578b
\nBufferedSink writeDecimalLong(long v) \u5199\u5165\u4e00\u4e2a\u5341\u8fdb\u5236\u7684\u957f\u6574\u578b
\nBufferedSink writeHexadecimalUnsignedLong(long v) \u5199\u5165\u4e00\u4e2a\u5341\u516d\u8fdb\u5236\u65e0\u7b26\u53f7\u7684\u957f\u6574\u578b
\nBufferedSink writeInt(int i) \u5199\u5165\u4e00\u4e2a\u6574\u578b
\nBufferedSink writeIntLe(int i)
\nBufferedSink writeLong(long v) \u5199\u5165\u4e00\u4e2a\u957f\u6574\u578b
\nBufferedSink writeLongLe(long v)
\nBufferedSink writeShort(int s) \u5199\u5165\u4e00\u4e2a\u77ed\u6574\u578b
\nBufferedSink writeShortLe(int s)
\nBufferedSink writeString(String string, Charset charset) \u5199\u5165\u4e00\u4e2aString\uff0c\u5e76\u4ee5charset\u683c\u5f0f\u7f16\u7801
\nBufferedSink writeString(String string, int beginIndex, int endIndex, Charset charset) \u5c06String\u4e2d\u4ecebeginIndex\u5230endIndex\u5199\u5165\uff0c\u5e76\u4ee5charset\u683c\u5f0f\u7f16\u7801
\nBufferedSink writeUtf8(String string) \u5c06String \u4ee5Utf – 8\u7f16\u7801\u5f62\u5f0f\u5199\u5165
\nBufferedSink writeUtf8(String string, int beginIndex, int endIndex) \u5c06String\u4e2d\u4ecebeginIndex\u5230endIndex\u5199\u5165\uff0c\u5e76\u4ee5Utf – 8\u683c\u5f0f\u7f16\u7801
\nBufferedSink writeUtf8CodePoint(int codePoint) \u4ee5Utf – 8\u7f16\u7801\u5f62\u5f0f\u5199\u5165\u7684\u8282\u70b9\u957f\u5ea6
\n\/\/2. BufferedSource\u5b9a\u4e49\u7684\u65b9\u6cd5\u548cBufferedSink\u6781\u4e3a\u76f8\u4f3c\uff0c\u53ea\u4e0d\u8fc7\u4e00\u4e2a\u662f\u5199\u4e00\u4e2a\u662f\u8bfb
\nBufferedSource \t\tread(byte[] sink) \u5c06\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6\u5b57\u7b26\u6570\u7ec4sink \u81f3sink
\nBufferedSource \t\tread(byte[] sink, int offset, int byteCount) \u5c06\u7f13\u51b2\u533a\u4e2d\u4eceoffst\u5f00\u59cb\u8bfb\u53d6byteCount\u4e2a\u5b57\u7b26 \u81f3sink
\nBufferedSource \t\treadAll(Sink sink) \u8bfb\u53d6\u6240\u6709\u7684Sink
\nBufferedSource \t\treadByte() \u4ece\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26
\nBufferedSource \t\treadByteArray() \u4ece\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4
\nBufferedSource \t\treadByteArray(long byteCount) \u4ece\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6\u4e00\u4e2a\u957f\u5ea6\u4e3abyteCount\u7684\u5b57\u7b26\u6570\u7ec4
\nBufferedSource \t readByteString() \u5c06\u7f13\u51b2\u533a\u5168\u90e8\u8bfb\u53d6\u4e3a\u5b57\u7b26\u4e32
\nBufferedSource \t readByteString(long byteCount) \u5c06\u7f13\u51b2\u533a\u8bfb\u53d6\u957f\u5ea6\u4e3abyteCount\u7684\u5b57\u7b26\u4e32
\nBufferedSource \t readDecimalLong() \u8bfb\u53d6\u5341\u8fdb\u5236\u6570\u957f\u5ea6
\nBufferedSource \t readFully(Buffer sink, long byteCount) \u8bfb\u53d6byteCount\u4e2a\u5b57\u7b26\u81f3sink
\nBufferedSource \t readFully(byte[] sink) \u8bfb\u53d6\u6240\u6709\u5b57\u7b26\u81f3sink
\nBufferedSource \t readHexadecimalUnsignedLong() \u8bfb\u53d6\u5341\u516d\u8fdb\u5236\u6570\u957f\u5ea6
\nBufferedSource \t\treadInt() \u4ece\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6\u4e00\u4e2a\u6574\u6570
\nBufferedSource \t\treadIntLe()
\nBufferedSource \t readLong() \u4ece\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6Long \u6574\u6570
\nBufferedSource \t\treadLongLe()
\nBufferedSource \t\treadShort() \u4ece\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6\u4e00\u4e2a\u77ed\u6574\u5f62
\nBufferedSource \t\treadShortLe()
\nBufferedSource \t\treadString(Charset charset) \u4ece\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6\u4e00\u4e2aString
\nBufferedSource \t\treadString(long byteCount, Charset charset) \u8bfb\u53d6\u4e00\u4e2a\u957f\u5ea6\u4e3abyteCount\u7684String\uff0c\u5e76\u4ee5charset\u5f62\u5f0f\u7f16\u7801
\nBufferedSource \t\treadUtf8() \u8bfb\u53d6\u7f16\u7801\u683c\u5f0f\u4e3aUtf-8\u7684String
\nBufferedSource \t\treadUtf8(long byteCount) \u8bfb\u53d6\u7f16\u7801\u683c\u5f0f\u4e3aUtf-8\u4e14\u957f\u5ea6\u4e3abyteCount\u7684String
\nBufferedSource \t\treadUtf8CodePoint() \u8bfb\u53d6\u4e00\u4e2aUtf-8\u7f16\u7801\u8282\u70b9\uff0c\u957f\u5ea6\u57281-4\u4e4b\u95f4
\nBufferedSource \t\treadUtf8Line() \u8bfb\u53d6\u4e00\u884cUtf-8 \u7f16\u7801\u7684String\uff0c\u78b0\u5230\u6362\u884c\u65f6\u505c\u6b62
\nBufferedSource \t\treadUtf8LineStrict()
\n\/\/3. ByteString: \u4f5c\u4e3a\u4e00\u4e2a\u5de5\u5177\u7c7b\uff0c\u529f\u80fd\u5341\u5206\u5f3a\u5927\uff0c\u5b83\u53ef\u4ee5\u628abyte\u8f6c\u4e3aString\uff0c\u8fd9\u4e2aString\u53ef\u4ee5\u662futf8\u7684\u503c\uff0c\u4e5f\u53ef\u4ee5\u662fbase64\u540e\u7684\u503c\uff0c\u4e5f\u53ef\u4ee5\u662fmd5\u7684\u503c\uff0c\u4e5f\u53ef\u4ee5\u662fsha256\u7684\u503c
\nString \tbase64()
\nString \tbase64Url()
\nString \tutf8()
\nByteString \tsha1()
\nByteString \tsha256()<\/p>\n
static ByteString \tdecodeBase64(String base64)
\nstatic ByteString \tdecodeHex(String hex)
\nstatic ByteString \tencodeUtf8(String s)
\n\/\/4. \u8bfb\u5199\u4f7f\u7528
\n\/**
\n * @Author: LiuJinYang
\n * @CreateDate: 2020\/12\/23
\n *\/
\npublic class OkioDemo {
\n public static void main(String[] args) {
\n testWrite();
\n testRead();
\n testGzip();
\n }<\/p>\n
private static void testWrite() {
\n String fileName = “tea.txt”;
\n boolean isCreate;
\n Sink sink;
\n BufferedSink bufferedSink = null;
\n String path = Environment.getExternalStorageDirectory().getPath();
\n try {
\n File file = new File(path, fileName);
\n if (!file.exists()) {
\n isCreate = file.createNewFile();
\n } else {
\n isCreate = true;
\n }
\n if (isCreate) {
\n sink = Okio.sink(file);
\n bufferedSink = Okio.buffer(sink);
\n bufferedSink.writeInt(90002);
\n bufferedSink.writeString(“asdfasdf”, Charset.forName(“GBK”));
\n bufferedSink.flush();
\n }
\n } catch (IOException e) {
\n e.printStackTrace();
\n } finally {
\n try {
\n if (null != bufferedSink) {
\n bufferedSink.close();
\n }
\n } catch (IOException e) {
\n e.printStackTrace();
\n }<\/p>\n
}
\n }<\/p>\n
private static void testRead() {
\n String fileName = “tea.txt”;
\n Source source;
\n BufferedSource bufferedSource = null;
\n try {
\n String path = Environment.getExternalStorageDirectory().getPath();
\n File file = new File(path, fileName);
\n source = Okio.source(file);
\n bufferedSource = Okio.buffer(source);
\n String read = bufferedSource.readString(Charset.forName(“GBK”));
\n LjyLogUtil.d(read);
\n } catch (IOException e) {
\n e.printStackTrace();
\n } finally {
\n try {
\n if (null != bufferedSource) {
\n bufferedSource.close();
\n }
\n } catch (IOException e) {
\n e.printStackTrace();
\n }
\n }
\n }<\/p>\n
\/**
\n * \u6216\u8bb8\u6709\u65f6\u5019\u7f51\u7edc\u8bf7\u6c42\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528\u5230Gzip\u7684\u529f\u80fd
\n *\/
\n private static void testGzip() {
\n Sink sink;
\n BufferedSink bufferedSink = null;
\n GzipSink gzipSink;
\n try {
\n File dest = new File(“resources\/gzip.txt”);
\n sink = Okio.sink(dest);
\n gzipSink = new GzipSink(sink);
\n bufferedSink = Okio.buffer(gzipSink);
\n bufferedSink.writeUtf8(“android vs ios”);
\n } catch (FileNotFoundException e) {
\n e.printStackTrace();
\n } catch (IOException e) {
\n e.printStackTrace();
\n } finally {
\n closeQuietly(bufferedSink);
\n }
\n Source source;
\n BufferedSource bufferedSource = null;
\n GzipSource gzipSource;
\n try {
\n File file = new File(“resources\/gzip.txt”);
\n source = Okio.source(file);
\n gzipSource = new GzipSource(source);
\n bufferedSource = Okio.buffer(gzipSource);
\n String content = bufferedSource.readUtf8();
\n System.out.println(content);
\n } catch (FileNotFoundException e) {
\n e.printStackTrace();
\n } catch (IOException e) {
\n e.printStackTrace();
\n } finally {
\n closeQuietly(bufferedSource);
\n }
\n }<\/p>\n
public static void closeQuietly(Closeable closeable) {
\n if (closeable != null) {
\n try {
\n closeable.close();
\n } catch (RuntimeException rethrown) {
\n throw rethrown;
\n } catch (Exception ignored) {
\n }
\n }
\n }
\n}
\n“`<\/p>\n
#### \u5c0f\u6587\u4ef6\u7cfb\u7edf<\/p>\n
– \u5bf9\u4e8e\u6587\u4ef6\u7cfb\u7edf\u6765\u8bf4\uff0c\u76ee\u5f55\u67e5\u627e\u7684\u6027\u80fd\u662f\u975e\u5e38\u91cd\u8981\u7684
\n– \u6587\u4ef6\u8bfb\u53d6\u7684\u65f6\u95f4 = \u627e\u5230\u6587\u4ef6\u7684 inode \u7684\u65f6\u95f4 + \u6839\u636e inode \u8bfb\u53d6\u6587\u4ef6\u6570\u636e\u7684\u65f6\u95f4\uff0c\u5982\u679c\u6211\u4eec\u9700\u8981\u9891\u7e41\u8bfb\u5199\u51e0\u4e07\u4e2a\u5c0f\u6587\u4ef6\uff0c\u67e5\u627e inode \u7684\u65f6\u95f4\u4f1a\u53d8\u5f97\u975e\u5e38\u53ef\u89c2\uff1b
\n– Google \u7684 GFS\u3001\u6dd8\u5b9d\u5f00\u6e90\u7684TFS\u3001Facebook \u7684 Haystack \uff0c\u5fae\u4fe1\u7684 SFS \u90fd\u662f\u4e13\u95e8\u4e3a\u6d77\u91cf\u5c0f\u6587\u4ef6\u7684\u5b58\u50a8\u548c\u68c0\u7d22\u8bbe\u8ba1\u7684\u6587\u4ef6\u7cfb\u7edf\uff1b\u8981\u652f\u6301 VFS \u63a5\u53e3\uff0c\u8fd9\u6837\u4e0a\u5c42\u7684 I\/O \u64cd\u4f5c\u4ee3\u7801\u5e76\u4e0d\u9700\u8981\u6539\u52a8\uff1b
\n– \u5927\u91cf\u7684\u5c0f\u6587\u4ef6\u5408\u5e76\u4e3a\u5927\u6587\u4ef6\u540e\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u5c06\u80fd\u8fde\u7eed\u8bbf\u95ee\u7684\u5c0f\u6587\u4ef6\u5408\u5e76\u5b58\u50a8\uff0c\u5c06\u539f\u672c\u5c0f\u6587\u4ef6\u95f4\u7684\u968f\u673a\u8bbf\u95ee\u53d8\u4e3a\u4e86\u987a\u5e8f\u8bbf\u95ee\uff0c\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u6027\u80fd\u3002\u540c\u65f6\u5408\u5e76\u5b58\u50a8\u80fd\u591f\u6709\u6548\u51cf\u5c11\u5c0f\u6587\u4ef6\u5b58\u50a8\u65f6\u6240\u4ea7\u751f\u7684\u78c1\u76d8\u788e\u7247\u95ee\u9898\uff0c\u63d0\u9ad8\u78c1\u76d8\u7684\u5229\u7528\u7387\u3002<\/p>\n
## I\/O \u8ddf\u8e2a<\/p>\n
#### 1. Java Hook<\/p>\n
– FileInputStream \u7684\u6574\u4e2a\u8c03\u7528\u6d41\u7a0b\uff1a<\/p>\n
“`
\njava : FileInputStream -> IoBridge.open -> Libcore.os.open -> BlockGuardOs.open -> Posix.open
\n\/1.\/\u5728Libcore.java\u4e2d\u53ef\u4ee5\u627e\u5230\u4e00\u4e2a\u633a\u4e0d\u9519\u7684 Hook \u70b9\uff0c\u90a3\u5c31\u662fBlockGuardOs\u8fd9\u4e00\u4e2a\u9759\u6001\u53d8\u91cf
\npublic static Os os = new BlockGuardOs(new Posix());
\n\/\/ \u53cd\u5c04\u83b7\u5f97\u9759\u6001\u53d8\u91cf
\nClass clibcore = Class.forName(“libcore.io.Libcore”);
\nField fos = clibcore.getDeclaredField(“os”);
\n\/\/2.\u53ef\u4ee5\u901a\u8fc7\u52a8\u6001\u4ee3\u7406\u7684\u65b9\u5f0f\uff0c\u5728\u6240\u6709 I\/O \u76f8\u5173\u65b9\u6cd5\u524d\u540e\u52a0\u5165\u63d2\u6869\u4ee3\u7801\uff0c\u7edf\u8ba1 I\/O \u64cd\u4f5c\u76f8\u5173\u7684\u4fe1\u606f
\n\/\/ \u52a8\u6001\u4ee3\u7406\u5bf9\u8c61
\nProxy.newProxyInstance(cPosix.getClassLoader(), getAllInterfaces(cPosix), this);
\nbeforeInvoke(method, args, throwable);
\nresult = method.invoke(mPosixOs, args);
\nafterInvoke(method, args, result);
\n“`<\/p>\n
– \u7f3a\u70b9\uff1a
\n – \u6027\u80fd\u6781\u5dee\uff1a\u56e0\u4e3a\u4f7f\u7528\u52a8\u6001\u4ee3\u7406\u548c Java \u7684\u5927\u91cf\u5b57\u7b26\u4e32\u64cd\u4f5c
\n – \u65e0\u6cd5\u76d1\u63a7 Native \u4ee3\u7801
\n – \u517c\u5bb9\u6027\u5dee: \u7279\u522b\u662f Android P \u589e\u52a0\u5bf9\u975e\u516c\u5f00 API \u9650\u5236<\/p>\n
#### 2. Native Hook<\/p>\n
– Profilo \u4f7f\u7528\u5230\u662f PLT Hook \u65b9\u6848,\u6027\u80fd\u6bd4GOT Hook\u8981\u7a0d\u597d\u4e00\u4e9b\uff0c\u4e0d\u8fc7 GOT Hook \u7684\u517c\u5bb9\u6027\u4f1a\u66f4\u597d\u4e00\u4e9b
\n– \u6700\u7ec8\u662f\u4ece libc.so \u4e2d\u7684\u8fd9\u51e0\u4e2a\u51fd\u6570\u4e2d\u9009\u5b9a Hook \u7684\u76ee\u6807\u51fd\u6570<\/p>\n
“`
\nint open(const char *pathname, int flags, mode_t mode);
\nssize_t read(int fd, void *buf, size_t size);
\nssize_t write(int fd, const void *buf, size_t size); write_cuk
\nint close(int fd);
\n“`<\/p>\n
– \u9700\u8981\u9009\u62e9\u4e00\u4e9b\u6709\u8c03\u7528\u4e0a\u9762\u51e0\u4e2a\u65b9\u6cd5\u7684 library\u3002\u5fae\u4fe1 Matrix \u4e2d\u9009\u62e9\u7684\u662flibjavacore.so\u3001libopenjdkjvm.so\u3001libopenjdkjvm.so\uff0c\u53ef\u4ee5\u8986\u76d6\u5230\u6240\u6709\u7684 Java \u5c42\u7684 I\/O \u8c03\u7528\uff0c\u5177\u4f53\u53ef\u4ee5\u53c2\u8003io_canary_jni.cc
\n– \u4e0d\u8fc7\u66f4\u63a8\u8350 Profilo \u4e2datrace.cpp\u7684\u505a\u6cd5\uff0c\u5b83\u76f4\u63a5\u904d\u5386\u6240\u6709\u5df2\u7ecf\u52a0\u8f7d\u7684 library\uff0c\u4e00\u5e76\u66ff\u6362\u3002<\/p>\n
“`
\nvoid hookLoadedLibs() {
\n auto& functionHooks = getFunctionHooks();
\n auto& seenLibs = getSeenLibs();
\n facebook::profilo::hooks::hookLoadedLibs(functionHooks, seenLibs);
\n}
\n“`<\/p>\n
#### Matrix\u4f7f\u7528<\/p>\n
– Matrix-android \u5f53\u524d\u76d1\u63a7\u8303\u56f4\u5305\u62ec\uff1a\u5e94\u7528\u5b89\u88c5\u5305\u5927\u5c0f\uff0c\u5e27\u7387\u53d8\u5316\uff0c\u542f\u52a8\u8017\u65f6\uff0c\u5361\u987f\uff0c\u6162\u65b9\u6cd5\uff0cSQLite \u64cd\u4f5c\u4f18\u5316\uff0c\u6587\u4ef6\u8bfb\u5199\uff0c\u5185\u5b58\u6cc4\u6f0f\u7b49\u7b49\u3002<\/p>\n
“`
\n# 1. gradle.properties \u4e2d\u914d\u7f6e\u8981\u4f9d\u8d56\u7684 Matrix \u7248\u672c\u53f7
\nMATRIX_VERSION=0.6.6
\n\/\/2. \u5728\u4f60\u9879\u76ee\u6839\u76ee\u5f55\u4e0b\u7684 build.gradle \u6587\u4ef6\u6dfb\u52a0 Matrix \u4f9d\u8d56
\nclasspath (“com.tencent.matrix:matrix-gradle-plugin:${MATRIX_VERSION}”) { changing = true }
\n\/\/3.1 \u6dfb\u52a0matrix-plugin
\napply plugin: ‘com.tencent.matrix-plugin’
\n\/\/3.2
\nmatrix {
\n trace {
\n enable = true\t\/\/if you don’t want to use trace canary, set false
\n baseMethodMapFile = “${project.buildDir}\/matrix_output\/Debug.methodmap”
\n blackListFile = “${project.projectDir}\/matrixTrace\/blackMethodList.txt”
\n }
\n}
\n\/\/3.3 \u5728 app\/build.gradle \u6587\u4ef6\u4e2d\u6dfb\u52a0 Matrix \u5404\u6a21\u5757\u7684\u4f9d\u8d56
\nimplementation group: “com.tencent.matrix”, name: “matrix-android-lib”, version: MATRIX_VERSION, changing: true
\nimplementation group: “com.tencent.matrix”, name: “matrix-android-commons”, version: MATRIX_VERSION, changing: true
\nimplementation group: “com.tencent.matrix”, name: “matrix-trace-canary”, version: MATRIX_VERSION, changing: true
\nimplementation group: “com.tencent.matrix”, name: “matrix-resource-canary-android”, version: MATRIX_VERSION, changing: true
\nimplementation group: “com.tencent.matrix”, name: “matrix-resource-canary-common”, version: MATRIX_VERSION, changing: true
\nimplementation group: “com.tencent.matrix”, name: “matrix-io-canary”, version: MATRIX_VERSION, changing: true
\nimplementation group: “com.tencent.matrix”, name: “matrix-sqlite-lint-android-sdk”, version: MATRIX_VERSION, changing: true
\n\/**
\n * 4. \u5b9e\u73b0 PluginListener\uff0c\u63a5\u6536 Matrix \u5904\u7406\u540e\u7684\u6570\u636e
\n *\/
\npublic class TestPluginListener extends DefaultPluginListener {
\n public static final String TAG = “Matrix.TestPluginListener”;
\n public TestPluginListener(Context context) {
\n super(context);<\/p>\n
}<\/p>\n
@Override
\n public void onReportIssue(Issue issue) {
\n super.onReportIssue(issue);
\n MatrixLog.e(TAG, issue.toString());<\/p>\n
\/\/add your code to process data
\n }
\n}
\n\/**
\n * 5. \u5b9e\u73b0\u52a8\u6001\u914d\u7f6e\u63a5\u53e3\uff0c\u53ef\u4fee\u6539 Matrix \u5185\u90e8\u53c2\u6570, \u5176\u4e2d\u53c2\u6570\u5bf9\u5e94\u7684 key \u4f4d\u4e8e\u6587\u4ef6 MatrixEnum\u4e2d
\n *\/
\npublic class DynamicConfigImplDemo implements IDynamicConfig {
\n private static final String TAG = “Matrix.DynamicConfigImplDemo”;<\/p>\n
public DynamicConfigImplDemo() {<\/p>\n
}<\/p>\n
public boolean isFPSEnable() {
\n return true;
\n }<\/p>\n
public boolean isTraceEnable() {
\n return true;
\n }<\/p>\n
public boolean isMatrixEnable() {
\n return true;
\n }<\/p>\n
@Override
\n public String get(String key, String defStr) {
\n \/\/TODO here return default value which is inside sdk, you can change it as you wish. matrix-sdk-key in class MatrixEnum.
\n return defStr;
\n }<\/p>\n
@Override
\n public int get(String key, int defInt) {
\n \/\/TODO here return default value which is inside sdk, you can change it as you wish. matrix-sdk-key in class MatrixEnum.<\/p>\n
if (MatrixEnum.clicfg_matrix_resource_max_detect_times.name().equals(key)) {
\n MatrixLog.i(TAG, “key:” + key + “, before change:” + defInt + “, after change, value:” + 2);
\n return 2;\/\/new value
\n }<\/p>\n
if (MatrixEnum.clicfg_matrix_trace_fps_report_threshold.name().equals(key)) {
\n return 10000;
\n }<\/p>\n
if (MatrixEnum.clicfg_matrix_trace_fps_time_slice.name().equals(key)) {
\n return 12000;
\n }<\/p>\n
return defInt;<\/p>\n
}<\/p>\n
@Override
\n public long get(String key, long defLong) {
\n \/\/TODO here return default value which is inside sdk, you can change it as you wish. matrix-sdk-key in class MatrixEnum.
\n if (MatrixEnum.clicfg_matrix_trace_fps_report_threshold.name().equals(key)) {
\n return 10000L;
\n }<\/p>\n
if (MatrixEnum.clicfg_matrix_resource_detect_interval_millis.name().equals(key)) {
\n MatrixLog.i(TAG, key + “, before change:” + defLong + “, after change, value:” + 2000);
\n return 2000;
\n }<\/p>\n
return defLong;
\n }<\/p>\n
@Override
\n public boolean get(String key, boolean defBool) {
\n \/\/TODO here return default value which is inside sdk, you can change it as you wish. matrix-sdk-key in class MatrixEnum.<\/p>\n
return defBool;
\n }<\/p>\n
@Override
\n public float get(String key, float defFloat) {
\n \/\/TODO here return default value which is inside sdk, you can change it as you wish. matrix-sdk-key in class MatrixEnum.<\/p>\n
return defFloat;
\n }<\/p>\n
}
\n\/**
\n * 6. \u9009\u62e9\u7a0b\u5e8f\u542f\u52a8\u7684\u4f4d\u7f6e\u5bf9 Matrix \u8fdb\u884c\u521d\u59cb\u5316\uff0c\u5982\u5728 Application \u7684\u7ee7\u627f\u7c7b\u4e2d
\n *\/
\nprivate void initMatrix() {
\n \/\/ build matrix
\n Matrix.Builder builder = new Matrix.Builder(this);
\n \/\/ add general pluginListener
\n builder.patchListener(new TestPluginListener(this));
\n \/\/ dynamic config
\n DynamicConfigImplDemo dynamicConfig = new DynamicConfigImplDemo();<\/p>\n
\/\/ init plugin
\n IOCanaryPlugin ioCanaryPlugin = new IOCanaryPlugin(new IOConfig.Builder()
\n .dynamicConfig(dynamicConfig)
\n .build());
\n \/\/add to matrix
\n builder.plugin(ioCanaryPlugin);<\/p>\n
\/\/init matrix
\n Matrix.init(builder.build());<\/p>\n
\/\/ start plugin
\n ioCanaryPlugin.start();
\n}<\/p>\n
\/\/\u81f3\u6b64\uff0cMatrix\u5c31\u5df2\u6210\u529f\u96c6\u6210\u5230\u4f60\u7684\u9879\u76ee\u4e2d\uff0c\u5e76\u4e14\u5f00\u59cb\u6536\u96c6\u548c\u5206\u6790\u6027\u80fd\u76f8\u5173\u5f02\u5e38\u6570\u636e\uff0c
\n\/\/\u5982\u4ecd\u6709\u7591\u95ee\uff0c\u8bf7\u67e5\u770b \u793a\u4f8bhttps:\/\/github.com\/Tencent\/Matrix\/tree\/dev\/samples\/sample-android\/.
\n“`<\/p>\n
#### \u76d1\u63a7\u5185\u5bb9<\/p>\n
– \u6587\u4ef6\u7684\u540d\u5b57\u3001\u539f\u59cb\u5927\u5c0f\u3001\u6253\u5f00\u6587\u4ef6\u7684\u5806\u6808\u3001\u4f7f\u7528\u4e86\u4ec0\u4e48\u7ebf\u7a0b, \u4e00\u6b21\u64cd\u4f5c\u4e00\u5171\u4f7f\u7528\u4e86\u591a\u957f\u65f6\u95f4\uff0c\u4f7f\u7528\u7684 Buffer \u662f\u591a\u5927, \u662f\u4e00\u6b21\u8fde\u7eed\u8bfb\u5b8c\u7684\uff0c\u8fd8\u662f\u968f\u673a\u7684\u8bfb\u53d6;<\/p>\n
1. \u4e3b\u7ebf\u7a0b I\/O:\u6709\u65f6\u5019 I\/O \u7684\u5199\u5165\u4f1a\u7a81\u7136\u653e\u5927\uff0c\u5373\u4f7f\u662f\u51e0\u767e KB \u7684\u6570\u636e\uff0c\u8fd8\u662f\u5c3d\u91cf\u4e0d\u8981\u5728\u4e3b\u7ebf\u7a0b\u4e0a\u64cd\u4f5c;
\n2. \u8bfb\u5199 Buffer \u8fc7\u5c0f: \u5982\u679c\u6211\u4eec\u7684 Buffer \u592a\u5c0f\uff0c\u4f1a\u5bfc\u81f4\u591a\u6b21\u65e0\u7528\u7684\u7cfb\u7edf\u8c03\u7528\u548c\u5185\u5b58\u62f7\u8d1d\uff0c\u5bfc\u81f4 read\/write \u7684\u6b21\u6570\u589e\u591a\uff0c\u4ece\u800c\u5f71\u54cd\u4e86\u6027\u80fd\u3002
\n3. \u91cd\u590d\u8bfb:\u5982\u679c\u9891\u7e41\u5730\u8bfb\u53d6\u67d0\u4e2a\u6587\u4ef6\uff0c\u5e76\u4e14\u8fd9\u4e2a\u6587\u4ef6\u4e00\u76f4\u6ca1\u6709\u88ab\u5199\u5165\u66f4\u65b0\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u7f13\u5b58\u6765\u63d0\u5347\u6027\u80fd\u3002(\u52a0\u4e00\u5c42\u5185\u5b58 cache \u662f\u6700\u76f4\u63a5\u6709\u6548\u7684\u529e\u6cd5)<\/p>\n
“`
\npublic String readConfig() {
\n if (Cache != null) {
\n return cache;
\n }
\n cache = read(“configFile”);
\n return cache;
\n}
\n“`<\/p>\n
1. \u8d44\u6e90\u6cc4\u6f0f: \u6307\u6253\u5f00\u8d44\u6e90\u5305\u62ec\u6587\u4ef6\u3001Cursor \u7b49\u6ca1\u6709\u53ca\u65f6 close\uff0c\u4ece\u800c\u5f15\u8d77\u6cc4\u9732\u3002\u8fd9\u5c5e\u4e8e\u975e\u5e38\u4f4e\u7ea7\u7684\u7f16\u7801\u9519\u8bef\uff0c\u4f46\u5374\u975e\u5e38\u666e\u904d\u5b58\u5728\u3002<\/p>\n
#### I\/O \u4e0e\u542f\u52a8\u4f18\u5316<\/p>\n
– \u5bf9\u5927\u6587\u4ef6\u4f7f\u7528 mmap \u6216\u8005 NIO \u65b9\u5f0f: MappedByteBuffer\u5c31\u662f Java NIO \u4e2d\u7684 mmap \u5c01\u88c5\uff0c\u5bf9\u4e8e\u5927\u6587\u4ef6\u7684\u9891\u7e41\u8bfb\u5199\u4f1a\u6709\u6bd4\u8f83\u5927\u7684\u4f18\u5316\u3002
\n– \u5b89\u88c5\u5305\u4e0d\u538b\u7f29: \u5bf9\u542f\u52a8\u8fc7\u7a0b\u9700\u8981\u7684\u6587\u4ef6\uff0c\u6211\u4eec\u53ef\u4ee5\u6307\u5b9a\u5728\u5b89\u88c5\u5305\u4e2d\u4e0d\u538b\u7f29\uff0c\u8fd9\u6837\u4e5f\u4f1a\u52a0\u5feb\u542f\u52a8\u901f\u5ea6\uff0c\u4f46\u5e26\u6765\u7684\u5f71\u54cd\u662f\u5b89\u88c5\u5305\u4f53\u79ef\u589e\u5927\u3002
\n– Buffer \u590d\u7528: \u6211\u4eec\u53ef\u4ee5\u5229\u7528Okio\u5f00\u6e90\u5e93\uff0c\u5b83\u5185\u90e8\u7684 ByteString \u548c Buffer \u901a\u8fc7\u91cd\u7528\u7b49\u6280\u5de7\uff0c\u5f88\u5927\u7a0b\u5ea6\u4e0a\u51cf\u5c11 CPU \u548c\u5185\u5b58\u7684\u6d88\u8017\u3002
\n– \u5b58\u50a8\u7ed3\u6784\u548c\u7b97\u6cd5\u7684\u4f18\u5316: \u901a\u8fc7\u7b97\u6cd5\u6216\u8005\u6570\u636e\u7ed3\u6784\u7684\u4f18\u5316\uff0c\u8ba9\u6211\u4eec\u53ef\u4ee5\u5c3d\u91cf\u7684\u5c11 I\/O \u751a\u81f3\u5b8c\u5168\u6ca1\u6709 I\/O, \u6bd4\u5982\u4e00\u4e9b\u914d\u7f6e\u6587\u4ef6\u4ece\u542f\u52a8\u5b8c\u5168\u89e3\u6790\uff0c\u6539\u6210\u8bfb\u53d6\u65f6\u624d\u89e3\u6790\u5bf9\u5e94\u7684\u9879\uff1b\u66ff\u6362\u6389 XML\u3001JSON \u8fd9\u4e9b\u683c\u5f0f\u6bd4\u8f83\u5197\u4f59\u3001\u6027\u80fd\u6bd4\u8f83\u8f83\u5dee\u7684\u6570\u636e\u7ed3\u6784;<\/p>\n","protected":false},"excerpt":{"rendered":"
– IO \u4f18\u5316\u4e0d\u5c31\u662f\u4e0d\u5728\u4e3b\u7ebf\u7a0b\u8bfb\u5199\u5927\u6587\u4ef6\u5417\uff0c\u771f\u7684\u53ea\u6709\u8fd9\u4e48\u7b80\u5355\u5417\uff1f ## IO \u57fa\u7840 – … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-109","post","type-post","status-publish","format-aside","hentry","category-io_xiang_guan","post_format-post-format-aside"],"_links":{"self":[{"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/posts\/109","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/comments?post=109"}],"version-history":[{"count":6,"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/posts\/109\/revisions"}],"predecessor-version":[{"id":116,"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/posts\/109\/revisions\/116"}],"wp:attachment":[{"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/media?parent=109"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/categories?post=109"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.liumx.com\/index.php\/wp-json\/wp\/v2\/tags?post=109"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}