I would guess you are printing quite a bit, potentially with std::endl or
similar flushing each time.
If you want to figure out where you are spending time, build gem5.perf and run
with the google perftools. That's usually very informative.
Andreas
From: Daya S Khudia <[email protected]<mailto:[email protected]>>
Reply-To: gem5 users mailing list
<[email protected]<mailto:[email protected]>>
Date: Tuesday, 6 August 2013 20:16
To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Subject: [gem5-users] Slow writes to stderr file
Hi,
My application happens to write messages on stderr. GEM5 (latest stable
release) runs very slow if errout (for stderr redirection) option is specified
on the command line. The following are the gem5 commands and their times
without and with errout option to gem5.
Without errout (stderr is printed on terminal):
~/gem5-clean/gem5-stable/build/ARM/gem5.fast --outdir=./
~/gem5-clean/gem5-stable/configs/example/se.py --cmd=mp3dec/mp3dec.m5arm
--options="-v mp3dec/input1/small.mp3 --output=wave:out"
--output=result.out.input1
14.76user 0.16system 0:17.56elapsed 84%CPU
With errout:
~/gem5-clean/gem5-stable/build/ARM/gem5.fast --outdir=./
~/gem5-clean/gem5-stable/configs/example/se.py --cmd=mp3dec/mp3dec.m5arm
--options="-v mp3dec/input1/small.mp3 --output=wave:out"
--output=result.out.input1 --errout=result.err.input1
25.43user 1.57system 13:29.44elapsed 3%CPU
Does anyone know why this is happening?
Thanks a lot
Daya
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