Ingo Molnar wrote:
* 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,\
Hi, Ingo:
I did patch the header file and recompiled the kernel. I observed no
difference (two threads overhead stays too high). Thank you.
--
###############################################
Jie Chen
Scientific Computing Group
Thomas Jefferson National Accelerator Facility
12000, Jefferson Ave.
Newport News, VA 23606
(757)269-5046 (office) (757)269-6248 (fax)
[email protected]
###############################################
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- References:
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
- Re: Possible bug from kernel 2.6.22 and above, 2.6.24-rc4
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