* Jie Chen <[EMAIL PROTECTED]> wrote:
>> not "BARRIER time". I've re-read the discussion and found no hint
>> about how to build and run a barrier test. Either i missed it or it's
>> so obvious to you that you didnt mention it :-)
>>
>> Ingo
>
> Hi, Ingo:
>
> Did you do configure --enable-public-release? My qmt is for qcd
> calculation (one type of physics code) [...]
yes, i did exactly as instructed.
> [...]. Without the above flag one can only test PARALLEL overhead.
> Actually the PARALLEL benchmark has the same behavior as the BARRIER.
> Thanks.
hm, but PARALLEL does not seem to do that much context switching. So
basically you create the threads and do a few short runs to establish
overhead? Threads do not get fork-balanced at the moment - but turning
it on would be easy. Could you try the patch below - how does it impact
your results? (and please keep affinity setting off)
Ingo
----------->
Subject: sched: reactivate fork balancing
From: Ingo Molnar <[EMAIL PROTECTED]>
reactivate fork balancing.
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
include/linux/topology.h | 3 +++
1 file changed, 3 insertions(+)
Index: linux/include/linux/topology.h
===================================================================
--- linux.orig/include/linux/topology.h
+++ linux/include/linux/topology.h
@@ -103,6 +103,7 @@
.forkexec_idx = 0, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_NEWIDLE \
+ | SD_BALANCE_FORK \
| SD_BALANCE_EXEC \
| SD_WAKE_AFFINE \
| SD_WAKE_IDLE \
@@ -134,6 +135,7 @@
.forkexec_idx = 1, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_NEWIDLE \
+ | SD_BALANCE_FORK \
| SD_BALANCE_EXEC \
| SD_WAKE_AFFINE \
| SD_WAKE_IDLE \
@@ -165,6 +167,7 @@
.forkexec_idx = 1, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_NEWIDLE \
+ | SD_BALANCE_FORK \
| SD_BALANCE_EXEC \
| SD_WAKE_AFFINE \
| BALANCE_FOR_PKG_POWER,\
--
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