1995-05-19 09:49:09 +00:00
|
|
|
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).
|
1998-08-05 18:13:19 +00:00
|
|
|
|
|
|
|
|
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
|
1995-05-19 09:49:09 +00:00
|
|
|
or write a file at a rate of 1MB/s using getc() and putc().
|
1998-08-05 18:13:19 +00:00
|
|
|
|
1995-05-19 09:49:09 +00:00
|
|
|
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.
|
