Re: [RFC][PATCH] Remove cgroup member from struct page

[KAMEZAWA Hiroyuki]

On Mon, 1 Sep 2008 13:03:51 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> > That depends, if we can get the lockless page cgroup done quickly, I don't mind
> > waiting, but if it is going to take longer, I would rather push these changes
> > in. 
> The development of lockless-page_cgroup is not stalled. I'm just waiting for
> my 8cpu box comes back from maintainance...
> If you want to see, I'll post v3 with brief result on small (2cpu) box.
> 
This is current status (result of unixbench.)
result of 2core/1socket x86-64 system.

==
[disabled]
Execl Throughput                           3103.3 lps   (29.7 secs, 3 samples)
C Compiler Throughput                      1052.0 lpm   (60.0 secs, 3 samples)
Shell Scripts (1 concurrent)               5915.0 lpm   (60.0 secs, 3 samples)
Shell Scripts (8 concurrent)               1142.7 lpm   (60.0 secs, 3 samples)
Shell Scripts (16 concurrent)               586.0 lpm   (60.0 secs, 3 samples)
Dc: sqrt(2) to 99 decimal places         131463.3 lpm   (30.0 secs, 3 samples)

[rc4mm1]
Execl Throughput                           3004.4 lps   (29.6 secs, 3 samples)
C Compiler Throughput                      1017.9 lpm   (60.0 secs, 3 samples)
Shell Scripts (1 concurrent)               5726.3 lpm   (60.0 secs, 3 samples)
Shell Scripts (8 concurrent)               1124.3 lpm   (60.0 secs, 3 samples)
Shell Scripts (16 concurrent)               576.0 lpm   (60.0 secs, 3 samples)
Dc: sqrt(2) to 99 decimal places         125446.5 lpm   (30.0 secs, 3 samples)

[lockless]
Execl Throughput                           3041.0 lps   (29.8 secs, 3 samples)
C Compiler Throughput                      1025.7 lpm   (60.0 secs, 3 samples)
Shell Scripts (1 concurrent)               5713.6 lpm   (60.0 secs, 3 samples)
Shell Scripts (8 concurrent)               1113.7 lpm   (60.0 secs, 3 samples)
Shell Scripts (16 concurrent)               571.3 lpm   (60.0 secs, 3 samples)
Dc: sqrt(2) to 99 decimal places         125417.9 lpm   (30.0 secs, 3 samples)
==

>From this, single-thread results are good. multi-process results are not good ;)
So, I think the number of atomic ops are reduced but I have should-be-fixed
contention or cache-bouncing problem yet. I'd like to fix this and check on 8 core
system when it is back.
Recently, I wonder within-3%-overhead is realistic goal.

Thanks,
-Kame




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