1995-05-19 05:49:09 -04:00
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Bonnie: Filesystem Benchmark Program
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Bonnie tests the speed of file I/O using standard C library calls.
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It does reads and writes of blocks, testing for the limit of sustained
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data rate (usually limited by the drive or controller) and updates on
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a file (better simulating normal operating conditions and quite dependent
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on drive and OS optimisations).
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1998-08-05 14:13:19 -04:00
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The per-character read and write tests are generally limited by CPU speed
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only on current-generation hardware. It takes some 35 SPECint92 to read
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1995-05-19 05:49:09 -04:00
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or write a file at a rate of 1MB/s using getc() and putc().
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1998-08-05 14:13:19 -04:00
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1995-05-19 05:49:09 -04:00
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The seek tests are dependent on the buffer cache size, since the fraction
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of disk blocks that fits into the buffer cache will be found without any
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disk operation and will contribute zero seek time readings. I.e. if the
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buffer cache is 16MB and the Bonnie test file is 32MB in size, then the
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seek time will come out as half its real value. The seek time includes
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rotational delay, and will thus always come out higher than specified for
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a drive.
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