To run pthread or openmp program in FS mode, probably you need manually set the the cpu affinity for threads. Otherwise the work is not well distributed and may generate strange performance results.
Bonzi ------------------------------------------------------ Wang, Hao http://homepages.cae.wisc.edu/~wangh/ Ph.D. candidate Dept. of Electrical & Computer Engineering University of Wisconsin, Madison B.S. from Department of Microelectronics School of Electronics Engineering and Computer Science Peking University On Thu, May 16, 2013 at 6:31 PM, Yanqi Zhou <[email protected]> wrote: > Hi, > I run it in FS mode. Can you tell me the correct command? For instance, I > want to run with 4 threads. Also I am curious whether the multithreading in > gem5 is deterministic... > > > Thanks, > Yanqi > ------------------------------ > *From:* [email protected] [[email protected]] on > behalf of Tianyun Zhang [[email protected]] > *Sent:* Tuesday, May 14, 2013 4:07 PM > *To:* gem5 users mailing list > *Subject:* Re: [gem5-users] multithreading program > > heya, > > What's your command to run the simulations? Did u run it in SE or > FS? In SE mode, u need to link the m5thread lib for multithread benchmarks > like PARSEC. In FS mode, u only need to link the lpthread (if u built the > parsec pthread version) and the OS will do all the context switches for u. > Also did u turn on any debug flags like ExecAll which prints all the > instructions including syscalls. > > > On Tue, May 14, 2013 at 3:54 PM, Yanqi Zhou <[email protected]> wrote: > >> Hey everyone, >> Has anyone ever run multithreading program in gem5, such as PARSEC? What >> command should I use? >> I set the cpu_num to 4, only the system cpu is different in the trace >> file. How multithreading works in gem5? I cannot see any system call in >> the trace file, when the threads do a context switch in gem5? >> >> Thanks, >> >> >> _______________________________________________ >> gem5-users mailing list >> [email protected] >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >> > > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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