Does that mean I don't have to use m5threads and just use the regular pthread library ?
On Fri, Apr 16, 2021 at 2:13 PM Jason Lowe-Power <ja...@lowepower.com> wrote: > Hi John, > > Yeah, it's something like that. We usually suggest using N + 1 cores where > N is the number of threads. You can always use more ;). > > As a side note, if you configure things correctly (whatever that means...) > I believe you can get pthreads to work. You can link to the pthreads on the > host and I think gem5 can correctly execute that code. > > Cheers, > Jason > > On Fri, Apr 16, 2021 at 10:42 AM John Smith <jjsmith2...@gmail.com> wrote: > >> That sounds great. In the meantime I will work a bit more on the SE mode. >> Also do you have any inputs on the following ? >> >> m5threads: 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). >> >> Thank you, >> John Smith >> >> On Fri, Apr 16, 2021 at 12:58 PM Jason Lowe-Power <ja...@lowepower.com> >> wrote: >> >>> Soon! https://gem5.atlassian.net/browse/GEM5-195 >>> >>> We're hopeful that in the next month or so all of this code will be >>> public. >>> >>> Cheers, >>> Jason >>> >>> On Fri, Apr 16, 2021 at 9:55 AM John Smith <jjsmith2...@gmail.com> >>> wrote: >>> >>>> 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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