[parsec-users] Defining number of threads of freqmine

Christian Bienia cbienia at CS.Princeton.EDU
Tue Jan 27 00:08:58 EST 2009


Freqmine is an OpenMP program. You can define the number of threads by
setting the environment variable OMP_NUM_THREADS to the desired number. Some
more information about OpenMP:


Also, notice that you can tell parsecmgmt to run the PARSEC workloads via
pin. You need to specify the pin binary and arguments with the -s argument
like Qi Zhang did with strace. So the argument would be something like that:

Parsecmgmt -a run -s './pin -mt -t  inscount2_mt.so --' -p freqmine -i
simlarge -c gcc-hooks -n 4

Furthermore, be aware of the fact that the option -n has no effect at build
time. It specifies the number of threads to use which is something that is
only needed by programs during runtime. To get the serial version of the
programs you have to compile them with a build configuration that does that,
such as `gcc-serial' which we provide by default.

- Chris

-----Original Message-----
From: parsec-users-bounces at lists.cs.princeton.edu
[mailto:parsec-users-bounces at lists.cs.princeton.edu] On Behalf Of
fahimeh at ac.upc.edu
Sent: Monday, January 26, 2009 5:11 AM
To: PARSEC Users; XiaoGa
Subject: Re: [parsec-users] Defining number of threads of freqmine

Quoting XiaoGa <xiaoga at gmail.com>:

> Hi, Fahimeh
> I think using strace can determine how many thread created in a
> program.
> For example, in parsec root directory /parsec-1.0 run command:
> ./bin/parsecmgmt -s 'strace -ff -i -ttt -T -e trace=clone -o
> ../../../../freqmine_thread' -a run -p freqmine -c gcc-hooks -n 4 -i
> simlarge
> This will generate several files named freqmine_thread.xxxx, the xxxx is
> of each thread.
> Hope it help!
> Best regards!
> Qi Zhang
> University of Science and Technology of China
> O
> > Hello,
> >
> > Thank you,
> > I have read the readme files and parsec tutorial. I learn a lot of thing
> > about
> > parsec, but now one of my questions is remained unanswered: how I can
> > determine
> > the number of threads of freqmine during execution?
> >
> > For example, when I use inscount2_mt.so for it, always the number of
> > is
> > reported 1, even if it was build with -n 2 (or more). Please guide me.
> >
> > Your help would be highly appreciated.
> >
> > best regards,
> > Fahimeh
> > _______________________________________________
> >

Hello Qi Zhang,

Thank you for your guidance.
I done it, 4 freqmine_thread.* file were created but 2 of them are empty!

My problems is how I can define the number of threads of this package when
program is used by a pintool or run independently (not with parsecmgmt).

for example, when this command is used for counting instructions of each
" ./pin -mt -t  inscount2_mt.so --
./freqmine/inst/i486-linux.gcc-hooks/bin/freqmine T10I4D100K_3.dat 1 " ,
time the number of thread are reported 1 ! Even if it was build with n>1 ,
or gcc-hook.

Thank you very much,
Best regards,
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