> -----Original Message-----
> From: Borislav Petkov [mailto:[email protected]]
> Sent: Thursday, February 2, 2017 7:11 AM
>
> Context switches have dropped, cache misses are the same and we have a
> rise in cpu-migrations. That last bit is interesting and I don't have an
> answer yet. Maybe peterz has an idea.
>
Could it be that the scheduler is more lax about migrations between SMT
siblings?
> Cycles have dropped too.
>
> And we're 6 secs faster so I'll take that.
>
> Now on to run the same thing on a bigger bulldozer.
>
Here are my results on a 32C Bulldozer system with an SSD. Also, I use ccache so
I added "ccache -C" in the pre-build script so the cache gets cleared.
Before:
Performance counter stats for 'make -s -j65 bzImage' (3 runs):
2375752.777479 task-clock (msec) # 23.589 CPUs utilized
( +- 0.35% )
1,198,979 context-switches # 0.505 K/sec
( +- 0.34% )
8,964,671,259 cache-misses
( +- 0.44% )
79,399 cpu-migrations # 0.033 K/sec
( +- 1.92% )
37,840,875 page-faults # 0.016 M/sec
( +- 0.20% )
5,425,612,846,538 cycles # 2.284 GHz
( +- 0.36% )
3,367,750,745,825 instructions # 0.62 insn per cycle
( +- 0.11% )
750,591,286,261 branches # 315.938 M/sec
( +- 0.11% )
43,544,059,077 branch-misses # 5.80% of all branches
( +- 0.08% )
100.716043494 seconds time elapsed
( +- 1.97% )
After:
Performance counter stats for 'make -s -j65 bzImage' (3 runs):
1736720.488346 task-clock (msec) # 23.529 CPUs utilized
( +- 0.16% )
1,144,737 context-switches # 0.659 K/sec
( +- 0.20% )
8,570,352,975 cache-misses
( +- 0.33% )
91,817 cpu-migrations # 0.053 K/sec
( +- 1.67% )
37,688,118 page-faults # 0.022 M/sec
( +- 0.03% )
5,547,082,899,245 cycles # 3.194 GHz
( +- 0.19% )
3,363,365,420,405 instructions # 0.61 insn per cycle
( +- 0.00% )
749,676,420,820 branches # 431.662 M/sec
( +- 0.00% )
43,243,046,270 branch-misses # 5.77% of all branches
( +- 0.01% )
73.810517234 seconds time elapsed
( +- 0.02% )
Thanks,
Yazen
