1tiotest(1)                                                          tiotest(1)
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NAME

6       tiotest - Threaded I/O bench
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SYNOPSIS

10       tiotest  [-h]  [-W]  [-f SizeInMB] [-d TestDir] [-b BlkSizeInBytes] [-r
11       NumberRandOpsPerThread] [-t NumberOfThreads] [-T] [-c] [-L]  [-S]  [-R]
12       [-D DebugLevel] [-k SkipTestNoN]
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DESCRIPTION

17       tiotest is a file system benchmark especially designed to test
18        I/O performance with multiple running threads.
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OPTIONS

22       -h      Display a brief help and exit.
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25       -W      Instructs  tiotest to wait for previous thread to finish before
26               starting a new one in the writing phase. This  results  in  the
27               files to be sequentially allocated and thus prevents them to be
28               fragmented. Of course the writeside test is not  parallel  then
29               but  in  readside  the  files  are physically more sequentially
30               placed on the media (well this depends on the filesystem too).
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33       -f SizeInMB
34               The filesize per threat in MBytes. Defaults to 10 MB.
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37       -d TestDir
38               The directory in which to test.  Defaults  to  .,  the  current
39               directory.
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42       -b BlkSizeInBytes
43               The blocksize in Bytes to use. Defaults to 4096.
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46       -r NumberRandOpsPerThread
47               Random I/O operations per thread. Defaults to 1000.
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50       -t NumberOfThreads
51               The number of concurrent test threads. Defaults to 4.
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54       -T      More terse output.
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57       -c      Consistency  check  data. This should be used for stresstesting
58               the media rather than benchmarking (it will slow io  and  raise
59               cpu  percentage).   It  is especially usefull to seek media for
60               very hard to detect errors.
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63       -L      Hide latency output.
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66       -S      Do writing synchronously.
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69       -R      Use raw drives.
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72       -D DebugLevel
73               Set the debug level.
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76       -k fISkipTestNoN
77               Skip test number n. Could be used several times.
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81               Example:
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83                      while tiotest -c -f 2000 ; do echo run ok ; done
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86       To get usefull results the used file sizes should be a lot larger  than
87       the  physical amount of memory you have. A good idea is to boot with 16
88       Megs of RAM (Try passing the "mem=16M" option to the  kernel  to  limit
89       Linux to using a very small amount of memory) and into Single User mode
90       only.
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SEE ALSO

94       tiobench(1), bonnie(1), hdparm(8)
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AUTHOR

98       tiotest was written by Mika Kuoppala <miku@iki.fi>.
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100       This manual page was written by  Peter  Palfrader  <weasel@debian.org>,
101       for the Debian GNU/Linux system (but may be used by others).
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105Mac-2001                                                            tiotest(1)