On Fri, Mar 17, 2017 at 3:33 PM, Joshua Mora wrote:
> Thanks for the quick reply.
> This test is between 2 cores that are on different CPUs. Say data has to
> traverse coherent fabric (eg. QPI,UPI, cHT).
> It has to go to main memory independently of cache size. Wrong assumption ?
>
Depends on t
Thanks for the quick reply.
This test is between 2 cores that are on different CPUs. Say data has to
traverse coherent fabric (eg. QPI,UPI, cHT).
It has to go to main memory independently of cache size. Wrong assumption ?
Can data be evicted from cache and put into cache of second core on different
Joshua,
In shared memory the bandwidth depends on many parameters, including the
process placement and the size of the different cache levels. In your
particular case I guess after 128k you are outside the L2 cache (1/2 of the
cache in fact) and the bandwidth will drop as the data need to be flush
Hello,
I am trying to get the max bw for shared memory communications using
osu_[bw,bibw,mbw_mr] benchmarks.
I am observing a peak at ~64k/128K msg size and then drops instead of
sustaining it.
What parameters or linux config do I need to add to default openmpi settings
to get this improved ?
I am
