It's not quite as fast as /dev/zero but it's pretty quick: $ _random | dd iflag=fullblock bs=1M of=/dev/null count=1000 error writing output file 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 0.733022 s, 1.4 GB/s
$ cat /dev/zero | dd iflag=fullblock bs=1M of=/dev/null count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 0.185063 s, 5.7 GB/s On Mon, May 6, 2013 at 12:58 AM, Liu Yuan <[email protected]> wrote: > On 05/06/2013 03:45 PM, Joseph Glanville wrote: > > Turns out this doesn't increase the test performance any as it is > > actually I/O bound on my system. > > I have tried to modify '/dev/urandom' as '/dev/zero' for 008 and the > result is > > vanilla: 94s, modified: 80s > > Looks it is a good boost if we can have a faster generator as fast as > 'dd /dev/zero'. > > Thanks, > Yuan > > >
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