Will I also be able to run the GPU model in the FS mode ? On Fri, Apr 16, 2021 at 11:39 AM Jason Lowe-Power <ja...@lowepower.com> wrote:
> Hi John, > > I suggest using full system mode instead of SE mode if you're running a > multithreaded workload. In FS mode, there's a full OS so it can handle > thread switching, etc. For Parsec on x86 we've created a set of resources > for you to get started. See > https://gem5.googlesource.com/public/gem5-resources/+/refs/heads/stable/src/parsec/ > for details. > > Cheers, > Jason > > On Fri, Apr 16, 2021 at 8:07 AM John Smith via gem5-users < > gem5-users@gem5.org> wrote: > >> Hi All, >> >> I am sorry for the confusion. >> >> I am looking to run a multithreaded application on a mesh of 3x3 CPUs, >> where the benchmark spawns 9 threads and each thread runs on >> a single CPU (1:1). I went through the past discussions on this mailing >> list and saw that m5threads was needed to do this. I have some questions. >> >> (1) If there are 9 CPU, and the host CPU launches 9 threads, then are 8 >> threads launched on the remaining 8 CPUs and the 9th thread has to wait for >> a >> thread to complete to begin execution. If not then where does it run as >> all the 9 CPUs are currently running a thread (1 host + 8 threads). >> >> (2) Anthony Gutierrez said that m5threads is no longer needed. Is that >> correct for gem5-21 ? >> (Subject: Simulating multiprogrammed & multithreaded workloads in SE >> mode?) >> >> (3) Right now I am trying to build PARSEC 3.0 benchmarks with m5threads, >> but I am receiving some errors as follows and I am not sure why: >> >> >> >> >> >> *base_dir/local/gcc/bin/gcc -O3 -g -funroll-loops -fprefetch-loop-arrays >> base_dir/gem5dev/parsec-3.0/pkgs/pthread.o -static-libgcc >> -Wl,--hash-style=both -Wl,--as-needed -DPARSEC_VERSION=3.0-beta-20150206 -o >> siman_tsp siman_tsp.o -L base_dir/local/gcc/lib64 -L >> base_dir/local/gcc/lib ./.libs/libgslsiman.a ../rng/.libs/libgslrng.a >> ../ieee-utils/.libs/libgslieeeutils.a ../err/.libs/libgslerr.a >> ../sys/.libs/libgslsys.a ../utils/.libs/libutils.a -lpthread >> -lmbase_dir/gem5dev/parsec-3.0/pkgs/pthread.o: In function >> `__pthread_initialize_minimal':pthread.c:(.text+0x97): undefined reference >> to `_dl_phdr'pthread.c:(.text+0xd9): undefined reference to `_dl_phnum'* >> >> Generally how should I go about integrating the m5thread with any >> benchmark? >> >> (4) Also, what other CPU benchmarks are recommended which are >> multithreaded and can be run in a manner where I can >> launch a thread on each CPU ? >> >> Thank You, >> John Smith >> >> <https://www.mail-archive.com/search?l=gem5-users@gem5.org&q=from:%22Gutierrez%2C+Anthony%22> >> >> On Fri, Apr 16, 2021 at 1:50 AM Gabe Black via gem5-users < >> gem5-users@gem5.org> wrote: >> >>> That's essentially right, although gem5 does have some plumbing to run >>> multiple event queues within the same simulation which can coordinate with >>> each other within a small window (quantum) of time. gem5 has support for >>> fibers/threads/coroutines, but these are not typically used to model >>> events. Events are processed inline when they happen using a simple >>> function call. >>> >>> Gabe >>> >>> On Thu, Apr 15, 2021 at 2:46 AM gabriel.busnot--- via gem5-users < >>> gem5-users@gem5.org> wrote: >>> >>>> Hi John, >>>> >>>> Short answer : no, you can only run several simulations in parallel, >>>> but not a single simulation using one thread per CPU. >>>> >>>> Gem5 relies on Discrete Event Simulation (DES) to simulate the >>>> concurrent behavior of HW. >>>> DES is intrinsically sequential in its execution as it relies on >>>> coroutines (also called user user threads, greed threads, fibers, etc.). >>>> Parallelizing such application is a very hard task that often requires >>>> a lot of subtle code transformations to efficiently protect shared >>>> resources. >>>> If done correctly, then parallel DES does not have all the good >>>> properties of classic DES, especially determinism... Unless you add extra >>>> care to preserve it, which is hard, too. Trust me ;). >>>> >>>> This question has been discussed back in the days but seems stalled >>>> now: http://www.m5sim.org/Parallel_M5 >>>> >>>> Cheers, >>>> Gabriel >>>> _______________________________________________ >>>> gem5-users mailing list -- gem5-users@gem5.org >>>> To unsubscribe send an email to gem5-users-le...@gem5.org >>>> %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s >>>> >>> _______________________________________________ >>> gem5-users mailing list -- gem5-users@gem5.org >>> To unsubscribe send an email to gem5-users-le...@gem5.org >>> %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s >> >> _______________________________________________ >> gem5-users mailing list -- gem5-users@gem5.org >> To unsubscribe send an email to gem5-users-le...@gem5.org >> %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s > >
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