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incognito2
Asked: 2011-08-04 16:58:01 +0800 CST

best way of testing HD throughput for random reads on linux

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Is there a benchmark program I can use to measure random read speeds of a vps without interference from the kernel cache? Also looking for something where you can change the read sizes say 4k-64k.

hard-drive linux benchmark

2 Answers

  1. Best Answer

    I would recommend using iozone and/or bonnie++ to benchmark. If you're solid on what you need to test, both tools are customizable to those requirements.

    For iozone, try something like the following to run a single-threaded random read/write test with a 4k record size using a 4 Gigabyte file.

    Run this from the directory you wish to test: iozone -t1 -i2 -r4k -s4g

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  2. Note that you have to use iozone -t1 -i0 -i2 -r4k -s4g for the test in ewwhite answer to run. This -i0 (write test) is required before a read test as noted in https://superuser.com/questions/365588/iozone-runs-fail-with-no-such-file-or-directory-errors :

    The iozone manual states that if you're going to use the -i argument, you need to include -i 0 in order to have files to test against. In your case, use -i 0 -i 2 to get your write test. If you don't specify that test, the other tests have no file to work with and you'll get the error you see.

    Or you can run with -w -f <file> and do an initial -i 0 run. Then the file will be there for the following -i 2 test.

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