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
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