[llvm-testresults] [LLVMdev] bwilson__llvm-gcc_PROD__i386 nightly tester results

[Rotem, Nadav]

Hi, 

Did you disable hyper-threading and Turbo ? Turbo alone can boost/hinder the performance of kernels by 30%, and make the perf results very unstable.

Nadav

-----Original Message-----
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Duncan Sands
Sent: Monday, July 25, 2011 18:11
To: Bob Wilson
Cc: llvm-testresults at cs.uiuc.edu; LLVMdev
Subject: Re: [LLVMdev] [llvm-testresults] bwilson__llvm-gcc_PROD__i386 nightly tester results

Hi Bob,

>> A big compile time regression.  Any ideas?
>>
>> Ciao, Duncan.
>
> False alarm.  For some reason that I have not yet been able to figure out, these tests run significantly more slowly when I run them during the daytime, which I did for that run.  I checked a few of the worst regressions reported here and they all recovered in subsequent runs.

here is a crazy idea: during the day the room the computer is in is hotter,
and to avoid overheating the CPU frequency is reduced, resulting in the machine
running slower.

Ciao, Duncan.
_______________________________________________
LLVM Developers mailing list
LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
---------------------------------------------------------------------
Intel Israel (74) Limited

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.