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Bonnie
Jul 20, 2023
Performance Test of Filesystem I/O
Bonnie Filesystem Benchmark Program
Bonnie tests the speed of file I/O using standard C library calls. It does reads and writes of blocks, testing for the limit of sustained data rate usually limited by the drive or controller and updates on a file better simulating normal operating conditions and quite dependent on drive and OS optimisations.
The per-character read and write tests are generally limited by CPU speed only on current-generation hardware. It takes some 35 SPECint92 to read or write a file at a rate of 1MB/s using getc and putc.
The seek tests are dependent on the buffer cache size, since the fraction of disk blocks that fits into the buffer cache will be found without any disk operation and will contribute zero seek time readings. I.e. if the buffer cache is 16MB and the Bonnie test file is 32MB in size, then the seek time will come out as half its real value. The seek time includes rotational delay, and will thus always come out higher than specified for a drive.
Checkout these related ports:
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