mulix wrote:
>
>i decided to play too. i took your code and modified it, so that the
>tests are run seperately (since i didnt want the after effects from
>fork's COW behaviour to affect the memcpy case). i also modified it to
>use getrusage().
>
>here are my results:
>
>[mulix@alhambra tmp]$ for arg in 1 2 3; do ./b memcpy ; done ;
>memcpy'ed 1000 blocks of size 1048576. user time: 16.070000 secs, system time:
>0.060000 secs
>memcpy'ed 1000 blocks of size 1048576. user time: 15.960000 secs, system time:
>0.040000 secs
>memcpy'ed 1000 blocks of size 1048576. user time: 15.920000 secs, system time:
>0.060000 secs
>[mulix@alhambra tmp]$ for arg in 1 2 3; do ./b send ; done ;
>sent 1000 blocks of size 1048576. user time: 6.990000 secs, system time:
>10.020000 secs
>sent 1000 blocks of size 1048576. user time: 7.420000 secs, system time:
>10.330000 secs
>sent 1000 blocks of size 1048576. user time: 7.110000 secs, system time:
>10.380000 secs
>
Interesting, I compiled and ran your code with results:
memcpy'ed 1000 blocks of size 1048576. user time: 17.830000 secs,
system time: 0.010000 secs
sent 1000 blocks of size 1048576. user time: 8.190000 secs,
system time: 5.670000 secs
The sum of user and system time is pretty much equal (just as in yours)
I then commented out the memset commands and got:
memcpy'ed 1000 blocks of size 1048576. user time: 8.900000 secs,
system time: 0.040000 sec
sent 1000 blocks of size 1048576. user time: 0.000000 secs,
system time: 0.620000 secs
This is a dramatic difference.
Did you try this ?
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