Man Linux: Main Page and Category List

NAME

       mbw - Memory BandWidth benchmark

SYNOPSIS

       mbw [options] arraysize_in_MiB

DESCRIPTION

       mbw  determines  available  memory bandwidth by copying large arrays of
       data in memory.

OPTIONS

       -q     Quiet; suppress informational messages.

       -a     Suppress printing the average of each test.

       -n <number>
              Select number of loops per test

       -t <number>
              Select tests to be run.  If  no  -t  parameters  are  given  the
              default  is  to  run  all  tests.  -t0: memcpy() test, -t1: dumb
              (b[i]=a[i] style) test, -t2: memcpy() with arbitrary block size

       -b <bytes>
              Block size in bytes for -t2.

       -h     Show quick help.

USAGE

       mbw will allocate two arraysize arrays in memory and copy  one  to  the
       other.  Reported ’bandwidth’ is the amount of data copied over the time
       this operation took.

       Obviously mbw  needs  twice  arraysize  MiBytes  (1024*1024  bytes)  of
       physical  memory  - you’d better switch off swap or otherwise make sure
       no paging occurs. Needless to say that it should not be run on  a  busy
       system.

TODO

       Multiple  thread  support.   Better  configurability,  including  using
       getopt() for parsing arguments.

AUTHOR

       Andras.Horvath@cern.ch