Multiple IO Tester

  This application emulates a busy server in several states by launching multiple
threads that do various types of IO. This allows us to see what the consequences
are of running in a multitasking environment. This test uses direct IO and
invalidates caches between tests, testing the disk, not the memory.

NOTE: You need at least 3GB of free space in your current working directory.

The following tests currently consist of:

  8 sequential readers
  8 sequential writers
  8 mixed seqential readers/writers (random choice per IO)
  8 random readers
  8 random writers
  8 mixed random readers/writers (random choice per IO)

Feel free to modify the script to meet your needs. Enjoy!

The test should take less than 2 minutes. Press <ENTER> to begin...

 running IO "sequential read" test...
        result is 3.84GB per second

 running IO "sequential write" test...
        result is 1.17GB per second

 running IO "seq read/seq write" test...
        result is 1.13GB/949.97MB per second

 running IO "random read" test...
        result is 666.95MB per second
        equals 170739.0 IOs per second

 running IO "random write" test...
        result is 281.30MB per second
        equals 72012.2 IOs per second

 running IO "rand read/rand write" test...
        result is 166.27MB/166.25MB per second
        equals 42564.8/42560.0 IOs per second