我们在做IO密集型的应用程序的时候，比如MySQL数据库，通常系统的表现取决于workload的类型。 比如我们要调优，我们就必须非常清楚的知道数据的访问规律，收集到足够的数据，用来做调优的依据。
有很多工具可以收集系统层面的，设备层面的，进程层面的IO数据，但是没有一个现成的工具可以回答我们比如应用打开了多少文件，文件的读和写的比例是多少，调用了多少次sync, 每次的数据大小是多少，调用了多少次，每次用了多少时间， 是顺序操作还是随机操作，是那个线程发起的操作。
当然如果你对系统足够熟悉的话，你可以用systemtap来编写脚本获取这些数据，也不是什么难事。但是大部分的同学没有足够的耐心去做这个。
这时候Percona同样来救助了。他提供了一整套工具来协助定位MySQL服务器的问题。这套工具适合于大部分的IO服务器。
Aspersa is a collection of open-source system utilities primarily designed to ease the work of Percona consultants. This manual is the primary documentation for Aspersa tools. Please contribute your improvements.
项目地址：
ioprofile的使用文档：
它依赖于strace和lsof来做统计，所以在运行的时候会对目标系统产生一定的性能影响，不过还好，你可以指定收集数据的时间。
现在我们来试验下效果：
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[chuba@test.flashcache.sqa.cm4 ~]$ sudo /tmp/aspersa-read-only/ioprofile -p 21826
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Sun Jan 16 02:16:52 CST 2011
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total pread pwrite write fsync filename
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0.491959 0.000000 0.453529 0.000000 0.038430 /mnt/ibdata1
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0.296719 0.000000 0.273126 0.000000 0.023593 /mnt/ib_logfile0
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0.161494 0.061440 0.091133 0.000000 0.008921 /u01/mysql/data/ic_test/auction_auctions_0021.ibd
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0.146056 0.036532 0.102320 0.000000 0.007204 /u01/mysql/data/ic_test/auction_auctions_0020.ibd
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0.144570 0.007500 0.128466 0.000000 0.008604 /u01/mysql/data/ic_test/auction_auctions_0058.ibd
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0.138565 0.054159 0.078342 0.000000 0.006064 /u01/mysql/data/ic_test/auction_auctions_0009.ibd
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0.136702 0.017857 0.111383 0.000000 0.007462 /u01/mysql/data/ic_test/auction_auctions_0000.ibd
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[chuba@test.flashcache.sqa.cm4 ~]$ sudo /tmp/aspersa-read-only/ioprofile -p 21826 -c count
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Sun Jan 16 02:18:31 CST 2011
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total pread pwrite write fsync open filename
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1439 0 1410 0 29 0 /mnt/ib_logfile1
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691 0 0 691 0 0 /u01/mysql/log/mysql-bin.000169
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366 20 301 0 45 0 /u01/mysql/data/ic_test/auction_auctions_0012.ibd
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362 0 235 0 127 0 /mnt/ibdata1
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301 18 243 0 40 0 /u01/mysql/data/ic_test/auction_auctions_0036.ibd
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292 18 237 0 37 0 /u01/mysql/data/ic_test/auction_auctions_0026.ibd
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291 21 230 0 40 0 /u01/mysql/data/ic_test/auction_auctions_0027.ibd
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288 21 236 0 31 0 /u01/mysql/data/ic_test/auction_auctions_0013.ibd
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[chuba@test.flashcache.sqa.cm4 ~]$ sudo /tmp/aspersa-read-only/ioprofile -p 21826 -c sizes
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Sun Jan 16 02:22:01 CST 2011
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total pread pwrite write fsync filename
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225542144 0 225542144 0 0 /mnt/ibdata1
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6963200 229376 6733824 0 0 /u01/mysql/data/ic_test/auction_auctions_0013.ibd
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6094848 360448 5734400 0 0 /u01/mysql/data/ic_test/auction_auctions_0026.ibd
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5881856 278528 5603328 0 0 /u01/mysql/data/ic_test/auction_auctions_0031.ibd
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5849088 393216 5455872 0 0 /u01/mysql/data/ic_test/auction_auctions_0035.ibd
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5816320 311296 5505024 0 0 /u01/mysql/data/ic_test/auction_auctions_0036.ibd
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5701632 294912 5406720 0 0 /u01/mysql/data/ic_test/auction_auctions_0022.ibd
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5488640 376832 5111808 0 0 /u01/mysql/data/ic_test/auction_auctions_0029.ibd
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[chuba@test.flashcache.sqa.cm4 ~]$ sudo /tmp/aspersa-read-only/ioprofile -p 21826 -ctimes
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Sun Jan 16 02:25:36 CST 2011
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total pread pwrite write fsync filename
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0.448082 0.000000 0.413493 0.000000 0.034589 /mnt/ibdata1
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0.313238 0.000000 0.282403 0.000000 0.030835 /mnt/ib_logfile3
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0.163073 0.089651 0.065107 0.000000 0.008315 /u01/mysql/data/ic_test/auction_auctions_0005.ibd
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0.143463 0.004427 0.130650 0.000000 0.008386 /u01/mysql/data/ic_test/auction_auctions_0011.ibd
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0.137938 0.048641 0.080933 0.000000 0.008364 /u01/mysql/data/ic_test/auction_auctions_0021.ibd
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0.137061 0.006563 0.120739 0.000000 0.009759 /u01/mysql/data/ic_test/auction_auctions_0018.ibd
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0.136427 0.000000 0.000000 0.136427 0.000000 /u01/mysql/log/mysql-bin.000170
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0.125673 0.043824 0.074042 0.000000 0.007807 /u01/mysql/data/ic_test/auction_auctions_0000.ibd
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[chuba@test.flashcache.sqa.cm4 ~]$ sudo /tmp/aspersa-read-only/ioprofile -p 21826 -c sizes -g filename
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Sun Jan 16 02:29:54 CST 2011
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total pread pwrite write fsync open filename
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274186240 0 274186240 0 0 0 /mnt/ibdata1
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8306688 442368 7864320 0 0 0 /u01/mysql/data/ic_test/auction_auctions_0044.ibd
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6881280 262144 6619136 0 0 0 /u01/mysql/data/ic_test/auction_auctions_0042.ibd
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6799360 344064 6455296 0 0 0 /u01/mysql/data/ic_test/auction_auctions_0053.ibd
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6668288 475136 6193152 0 0 0 /u01/mysql/data/ic_test/auction_auctions_0047.ibd
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6602752 327680 6275072 0 0 0 /u01/mysql/data/ic_test/auction_auctions_0027.ibd
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6504448 344064 6160384 0 0 0 /u01/mysql/data/ic_test/auction_auctions_0041.ibd
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6275072 344064 5931008 0 0 0 /u01/mysql/data/ic_test/auction_auctions_0024.ibd
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6094848 393216 5701632 0 0 0 /u01/mysql/data/ic_test/auction_auctions_0038.ibd
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6078464 180224 5898240 0 0 0 /u01/mysql/data/ic_test/auction_auctions_0037.ibd
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[chuba@test.flashcache.sqa.cm4 ~]$ sudo /tmp/aspersa-read-only/ioprofile -p 21826 -c sizes -g pid
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Sun Jan 16 02:31:02 CST 2011
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total pread pwrite write fsync pid
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270971904 32768 270939136 0 0 21854
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70975488 0 70975488 0 0 21844
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67518464 0 67518464 0 0 21842
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66797568 0 66797568 0 0 21843
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65568768 0 65568768 0 0 21841
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[chuba@test.flashcache.sqa.cm4 ~]$ sudo /tmp/aspersa-read-only/ioprofile -p 21826 -c sizes -g all
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Sun Jan 16 02:32:15 CST 2011
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玩的开心！
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