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17943
2016 Nov 27
3
A couple metrics of LLD/ELF's performance
....
One useful purpose for this metric is that since L2 is core-private (my CPU
is an i7-6700HQ, but this will apply to all recent big intel cores), it
won't contend with other cores for the L3 cache. So misses here are where
cores start to feel each other's presence.
https://reviews.llvm.org/P7943
--event=LLC-load-misses
These are misses in last level cache (LLC). I.e. times that we have to go
to DRAM (SLOOOW).
The getVA codepath show up strongly and we see the memcpy into the output.
We may want to consider a nontemporal memcpy to at least avoid polluting
the cache.
These misses contend on...