The Gem5 SE mode is bare-metal fashion to run standard applications in absence of any OS. If we want to run a program in parallel, using POSIX thread or OpenMP, it is not possible to execute parallel-applications in bare-metal SE MODE.
On Mon, Oct 4, 2021 at 4:15 PM VIPIN PATEL via gem5-users < gem5-users@gem5.org> wrote: > Hi Krishan, > > I also faced a similar issue while executing the pthread program in SE > mode. It seems the number of core should be equal to the maximum number of > core you are trying to execute. > For example: If you are launching 4 thread with pthread_create, the number > of cores should be at least 5 (4 cores: one for each thread + 1 core for > master thread). > > Hope it helps. > > Regards, > Vipin > > On Mon, Aug 23, 2021 at 9:55 PM krishnan gosakan via gem5-users < > gem5-users@gem5.org> wrote: > >> I am facing a new problem with running multithreaded applications >> compiled with m5threads on gem5 in SE mode. >> The application I am using has 4 threads and all 4 threads work on the >> same function. The application is a breadth first search algorithm which >> works on a large graph. >> So, I have 4 threads which do bfs independently. When I run this in gem5 >> SE mode, I see that the first thread is created and it does all the bfs >> work and the remaining 3 threads just get created and the program exits (I >> mean they don't do any work in the bfs function). >> I see this is something similar to sequential execution. >> I guess I am missing some command line argument but can't find what it is. >> I am using the default CPU which is AtomicSimpleCPU (as I don't use cpu >> argument) and use 4 cores (as I have 4 threads). >> Any help would be appreciated. >> >> On Sat, Aug 7, 2021 at 9:10 PM Hossein Golestani <hosse...@umich.edu> >> wrote: >> >>> Hi Krishnan, >>> >>> The SE mode does not have any thread scheduler. You should have as many >>> cores as the maximum number threads your program may launch. In your >>> example, since your program has two threads, two cores are needed, each >>> running of the threads. >>> >>> Thanks, >>> Hossein >>> >>> >>> On Fri, Aug 6, 2021 at 5:16 AM krishnan gosakan < >>> krishnan.gosa...@gmail.com> wrote: >>> >>>> Seems like this problem arise only when number of cores is set to 1. >>>> When I increase the number of cores, I see that pthread_join is working >>>> perfectly. >>>> Not sure if this is kind of a limitation. >>>> Any idea? >>>> >>>> On Fri, Aug 6, 2021 at 11:16 AM krishnan gosakan < >>>> krishnan.gosa...@gmail.com> wrote: >>>> >>>>> Hi Hossein, >>>>> I used the m5thread_x86.o file and compiled my sample code (attached >>>>> with this mail). I used the following 2 commands to build my file >>>>> >>>>> gcc -g -O3 -c -o semodePthread.o semodePthread.c >>>>> gcc -static -o semodePthread semodePthread.o m5threads_x86.o >>>>> >>>>> By running semodePthread in gem5 se mode, I see that pthread_create is >>>>> succeeding but it gets stuck in pthread_join. Also I see printf in thread >>>>> function is not running. >>>>> Am I missing something? Or am I building it wrong? >>>>> ANy suggestions would be greatly appreciated. >>>>> >>>>> On Mon, Jul 26, 2021 at 2:03 AM Hossein Golestani <hosse...@umich.edu> >>>>> wrote: >>>>> >>>>>> [I'm resending my reply without the attachments in case they caused >>>>>> it to get into the spam folder.] >>>>>> >>>>>> Hi Krishnan, >>>>>> >>>>>> I remember that I also failed to build m5threads on a particular >>>>>> system, but I managed to build it on another system with a relatively old >>>>>> config (I have attached the output m5threads object files for x86 and ARM >>>>>> v7 to this email). If I remember correctly, that system had the Linux >>>>>> kernel 3.19 and gcc 4.8. You should be able to link the attached object >>>>>> file to your multi-threaded program compiled on a system with a newer >>>>>> kernel/compiler. Hope this helps. >>>>>> >>>>>> Thanks, >>>>>> Hossein >>>>>> >>>>>> >>>>>> On Sat, Jul 24, 2021 at 11:24 PM krishnan gosakan < >>>>>> krishnan.gosa...@gmail.com> wrote: >>>>>> >>>>>>> Hi Hossein, >>>>>>> I tried building m5threads but it failed. What system configuration >>>>>>> are you using to build m5threads? >>>>>>> What kernel version do you use and what compiler do you use? >>>>>>> >>>>>>> On Sat, Jul 24, 2021 at 10:28 PM Hossein Golestani < >>>>>>> hosse...@umich.edu> wrote: >>>>>>> >>>>>>>> Hi Krishnan, >>>>>>>> >>>>>>>> I use m5threads, which is a light-weight alternative for >>>>>>>> pthread, to simulate multi-threaded programs in the SE mode: >>>>>>>> https://github.com/gem5/m5threads >>>>>>>> (I'm not sure if there are any other ways.) >>>>>>>> >>>>>>>> Thanks, >>>>>>>> Hossein >>>>>>>> >>>>>>>> >>>>>>>> On Sat, Jul 24, 2021 at 11:00 AM krishnan gosakan via gem5-users < >>>>>>>> gem5-users@gem5.org> wrote: >>>>>>>> >>>>>>>>> Hi all, >>>>>>>>> I am trying to run a code with pthread in gem5 se mode. The code >>>>>>>>> runs perfectly when launched from command prompt but pthread_create >>>>>>>>> returns >>>>>>>>> error code 11 when run in se mode. Is there anything special I should >>>>>>>>> do to >>>>>>>>> make pthread run in se mode. From the tests directory, I see that C++ >>>>>>>>> std::thread is running perfectly in gem5 se mode. Any help would be >>>>>>>>> appreciated. >>>>>>>>> Thank you. >>>>>>>>> >>>>>>>>> Sample code I use in gem5 se mode >>>>>>>>> >>>>>>>>> #include <stdio.h> >>>>>>>>> #include <pthread.h> >>>>>>>>> >>>>>>>>> void *doWork1(void *arg) >>>>>>>>> { >>>>>>>>> for (int i=0; i<1000000000; i++) >>>>>>>>> ; >>>>>>>>> printf("work completed\n"); >>>>>>>>> } >>>>>>>>> >>>>>>>>> int main() >>>>>>>>> { >>>>>>>>> pthread_t thread; >>>>>>>>> int error = pthread_create(&thread, NULL, doWork1, NULL); >>>>>>>>> if (error == 0) >>>>>>>>> { >>>>>>>>> printf("thread created\n"); >>>>>>>>> pthread_join(thread, NULL); >>>>>>>>> printf("thread work complete\n"); >>>>>>>>> } >>>>>>>>> else >>>>>>>>> { >>>>>>>>> printf("error in thread creation %d\n",error); >>>>>>>>> } >>>>>>>>> return 0; >>>>>>>>> } >>>>>>>>> >>>>>>>>> -- >>>>>>>>> Regards, >>>>>>>>> Krishnan. >>>>>>>>> _______________________________________________ >>>>>>>>> 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 >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> -- >>>>>>> Regards, >>>>>>> Krishnan. >>>>>>> >>>>>> >>>>> >>>>> -- >>>>> Regards, >>>>> Krishnan. >>>>> >>>> >>>> >>>> -- >>>> Regards, >>>> Krishnan. >>>> >>> >> >> -- >> Regards, >> Krishnan. >> _______________________________________________ >> 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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