iozone测试文件系统IOzone is a filesystem benchmark tool/ The benchmark generates and measures a variety of file operations/ Iozone has been ported to many machines and runs under many operating systems/ Benchmark Features/* ANSII C source* POSIX async I/O* Mmap() file I/O* Normal file I/O* Single stream measurement* Multiple stream measurement* Distributed fileserver measurements (Cluster)* POSIX pthreads* Multi-process measurement* Excel importable output for graph generation* Latency plots* 64bit compatible source* Large file compatible* Stonewalling in throughput tests to eliminate straggler effects* Processor cache size configurable* Selectable measurements with fsync/ O_SYNC* Builds for/ AIX/ BSDI/ HP-UX/ IRIX/ FreeBSD/ Linux/ OpenBSD/ NetBSD/ OSFV3/ OSFV4/ OSFV5/ SCO OpenServer/ Solaris/ MAC OS X/ Windows (95/98/Me/NT/2K/XP)他的定位非常明确是针对文件系统的性能测试的。和常用的IO性能测试工具sysbench/ fio/ iometer不同/ 它主要是通过模拟用户访问文件模式的不同，典型的如下面的几种：(0=write/rewrite/ 1=read/re-read/ 2=random-read/write3=Read-backwards/ 4=Re-write-record/ 5=stride-read/ 6=fwrite/re-fwrite7=fread/Re-fread/ 8=random_mix/ 9=pwrite/Re-pwrite/ 10=pread/Re-pread11=pwritev/Re-pwritev/ 12=preadv/Re-preadv)来达到隔离访问文件系统的meta信息和data信息的不同的开销， 从而反应文件系统的性能。Ubuntu下可以用 apt-get -y install iozone安装就好。他有二种模式： 1/ 测试吞吐量模式。 2/ 测试文件系统对记录大小，文件大小不同组合的反应。以下是我用过的测试吞吐量模式的参数/iozone -t -l 1 -u 16 -L 64 -S 8192 -b fio/xls -R -M -s 10G -r 32k -I -T -C -j 32 -+p 60参数解释-t - Throughput test-s 10G - File size set to 18874368 KB-M -Machine = Linux my174/cm4 2/6/18-164/el5 #1 SMP Tue Aug 18 15/51/48 EDT 2009-r -32k Record Size 32 KB-I -O_DIRECT feature enabled-S 8192 -Processor cache size set to 8192 Kbytes/-L 64 -Processor cache line size set to 64 bytes/-j 32 -File stride size set to 32 * record size/-l 1 -Min thread = 1-u 16 -Max thread = 16-R -Excel chart generation enabled-b fi
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