On Thu, Feb 11, 2016 at 11:55 PM, Nicolas B. Pierron < nicolas.b.pier...@mozilla.com> wrote:
> On 02/10/2016 08:04 PM, Robert O'Callahan wrote: > >> Background: >> http://robert.ocallahan.org/2016/02/introducing-rr-chaos-mode.html >> >> I just landed on rr master support for a "-h" option which enables a chaos >> mode for rr recording. This is designed to help reproduce intermittent >> test >> failures under rr. […] >> > > Thanks Roc, I will give it a try. > > On the other hand, I used to rely more on the "-c" option to achieve a > similar thing in the past, instead of the "-e" option. > > The reason I did so being that the thread I am interested in does a few > syscalls compared to the rest of the program. Thus I felt that using "-e" > option would give it an unfair large time slices compared to what is > supposed to happen if the threads are running concurrently. The -e option is gone now because the new scheduler (with or without chaos mode) does not take system calls into account when calculating the length of a timeslice. We only count conditional branches. Bugs that require very frequent fine-grained context switching are probably still hard to find with chaos mode, because very frequent context switching slows down recording tremendously and I didn't want chaos mode to slow down execution by more than a bounded amount. So you may find that -c is still needed. Rob -- lbir ye,ea yer.tnietoehr rdn rdsme,anea lurpr edna e hnysnenh hhe uresyf toD selthor stor edna siewaoeodm or v sstvr esBa kbvted,t rdsme,aoreseoouoto o l euetiuruewFa kbn e hnystoivateweh uresyf tulsa rehr rdm or rnea lurpr .a war hsrer holsa rodvted,t nenh hneireseoouot.tniesiewaoeivatewt sstvr esn _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
