I have found that gem5 behavior is sensitive to the execution environment. I now run gem5 inside an ubuntu vm on qemu and have had much more consistent results. I haven't tried running kvm gem5 inside a kvm qemu vm, so not sure how that works, but might be worth trying.
Ryan On Fri, Sep 6, 2019, 08:07 Shehab Elsayed <shehaby...@gmail.com> wrote: > I was wondering if anyone is running into the same problem or if anyone > has any suggestions on how to proceed with debugging this problem. > > On Mon, Jul 29, 2019 at 4:57 PM Shehab Elsayed <shehaby...@gmail.com> > wrote: > >> Sorry for the spam. I just forgot to mention that the system >> configuration I am using is mainly from >> https://github.com/darchr/gem5/tree/jason/kvm-testing/configs/myconfigs. >> <https://github.com/darchr/gem5/tree/jason/kvm-testing/configs/myconfigs> >> >> >> Shehab Y. Elsayed, MSc. >> PhD Student >> The Edwards S. Rogers Sr. Dept. of Electrical and Computer Engineering >> University of Toronto >> E-mail: shehaby...@gmail.com >> <https://webmail.rice.edu/imp/message.php?mailbox=INBOX&index=11#> >> >> >> On Mon, Jul 29, 2019 at 4:08 PM Shehab Elsayed <shehaby...@gmail.com> >> wrote: >> >>> I have set up a repo with gem5 that demonstrates the problem. The repo >>> includes the latest version of gem5 from gem5's github repo with a few >>> patches applied to get KVM working together with the kernel binary and disk >>> image I am using. You can get the repo at >>> https://github.com/ShehabElsayed/gem5_debug.git. >>> <https://github.com/ShehabElsayed/gem5_debug.git> >>> >>> These steps should reproduce the problem: >>> 1- scons build/X86/gem5.opt >>> 2- ./scripts/get_fs_stuff.sh >>> 3- ./scripts/run_fs.sh 8 >>> >>> I have also included sample m5term outputs for both a 2 thread run >>> (m5out_2t) and an 8 thread run (m5out_8t) >>> >>> Any help is really appreciated. >>> >>> >>> >>> On Tue, Jul 23, 2019 at 11:01 AM Shehab Elsayed <shehaby...@gmail.com> >>> wrote: >>> >>>> When I enable the Exec debug flag I can see that it seems to be stuck >>>> in a spin lock (queued_spin_lock_slowpath) >>>> >>>> On Fri, Jul 19, 2019 at 5:28 PM Shehab Elsayed <shehaby...@gmail.com> >>>> wrote: >>>> >>>>> Hello All, >>>>> >>>>> I have a gem5 X86 full system set up that starts with KVM cores and >>>>> then switches to O3 cores once the benchmark reaches the region of >>>>> interest. Right now I am testing with a simple multithreaded hello >>>>> world benchmark. Sometimes the benchmark completes successfully while >>>>> others gem5 just seems to hang after starting the benchmark. I believe it >>>>> is still executing some instructions but without making any progress. The >>>>> chance of this behavior (indeterminism) happening increases as the >>>>> number of simulated cores or the number of threads created by the >>>>> benchmark >>>>> increases. >>>>> >>>>> Any ideas what might be the reason for this or how I can start >>>>> debugging this problem? >>>>> >>>>> Note: I have tried the patch in https://gem5-review.googlesource >>>>> .com/c/public/gem5/+/19568 but the problem persists. >>>>> >>>>> Thanks! >>>>> >>>> _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
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