磁碟效能測試工具: fio

1. fio
fio is an I/O tool meant to be used both for benchmark and stress/hardware verification. It has support for 19 different types of I/O engines (sync, mmap, libaio, posixaio, SG v3, splice, null, network, syslet, guasi, solarisaio, and more), I/O priorities (for newer Linux kernels), rate I/O, forked or threaded jobs, and much more. It can work on block devices as well as files. fio accepts job descriptions in a simple-to-understand text format. Several example job files are included. fio displays all sorts of I/O performance information, including complete IO latencies and percentiles. Fio is in wide use in many places, for both benchmarking, QA, and verification purposes. It supports Linux, FreeBSD, NetBSD, OpenBSD, OS X, OpenSolaris, AIX, HP-UX, Android, and Windows.

2. Usage

name=str        ASCII name of the job.

filename=str    Fio normally makes up a filename based on the job name,
                thread number, and file number.

rw=str          Type of io pattern. Accepted values are:

                        read            Sequential reads
                        write           Sequential writes
                        randwrite       Random writes
                        randread        Random reads
                        rw,readwrite    Sequential mixed reads and writes
                        randrw          Random mixed reads and writes

rwmixread=int   How large a percentage of the mix should be reads.

size=int        The total size of file io for this job.

bs=int          The block size used for the io units.

ioengine=str    Defines how the job issues io to the file. The following
                types are defined:

                        sync    Basic read(2) or write(2) io. lseek(2) is
                                used to position the io location.

                        psync   Basic pread(2) or pwrite(2) io.

                        vsync   Basic readv(2) or writev(2) IO.

                        psyncv  Basic preadv(2) or pwritev(2) IO.

iodepth=int     This defines how many io units to keep in flight against
                the file.

direct=bool     If value is true, use non-buffered io.

numjobs=int     Create the specified number of clones of this job.

group_reporting It may sometimes be interesting to display statistics for
                groups of jobs as a whole instead of for each individual job.

thread          fio defaults to forking jobs, however if this option is
                given, fio will use pthread_create(3) to create threads
                instead.

3. Performance Test
Sequential read

$ fio -name=test -rw=read -size=1G -bs=16k -ioengine=libaio -iodepth=16 -direct=1 -numjobs=16 -group_reporting

Sequential write

$ fio -name=test -rw=write -size=1G -bs=16k -ioengine=libaio -iodepth=16 -direct=1 -numjobs=16 -group_reporting

Random read

$ fio -name=test -rw=randread -size=1G -bs=16k -ioengine=libaio -iodepth=16 -direct=1 -numjobs=16 -group_reporting

Random write

$ fio -name=test -rw=randwrite -size=1G -bs=16k -ioengine=libaio -iodepth=16 -direct=1 -numjobs=16 -group_reporting

Sequential mixed read and write

$ fio -name=test -rw=rw -rwmixread=50 -size=1G -bs=16k -ioengine=libaio -iodepth=16 -direct=1 -numjobs=16 -group_reporting

Random mixed read & write

$ fio -name=test -rw=randrw -rwmixread=50 -size=1G -bs=16k -ioengine=libaio -iodepth=16 -direct=1 -numjobs=16 -group_reporting

4. 參考來源
http://linux.die.net/man/1/fio