Hi Rich, On Tue, Jun 08, 2021 at 04:09:33PM +0100, Richard W.M. Jones wrote: > I haven't filed a bug yet because I'm not sure what component to > assign this too. I upgraded to Rawhide this morning and noticed that > some tests that previously ran OK are now timing out. It turned out > that the tests were failing because a valgrinded executable runs much > more slowly in Rawhide today. > > Here's my test: > > Upgrade to Rawhide and install these additional packages: > > # dnf install libnbd nbdkit valgrind > > Unpack the certificates from > http://oirase.annexia.org/tmp/rawhide-valgrind-bug/pki.tar.gz into /tmp > > Run this command as NON-root (it's self-contained and just connects > the two commands together over localhost port 10809): > > $ time nbdkit --tls=require --tls-certificates=/tmp/pki null --run 'valgrind nbdinfo nbds://localhost' > > For me this takes over 40 seconds in Rawhide, versus a couple of > seconds in Fedora 33/34. Also if you remove "valgrind" it runs > instantaneously even in Rawhide. If you run it as root, it runs > quickly again (WTF!) > > The perf flamegraph seems to indicate it's doing a lot of stuff with > DWARF 3 symbols. > > http://oirase.annexia.org/tmp/rawhide-valgrind-bug/libnbd.svg > > Uninstalling all relevant debuginfo packages didn't seem to help. Thanks for using valgrind and sorry we made it even slower. I am working on it. As you already figured out, it has to do with debuginfo. Basically valgrind should only really need to read the line tables, but it does a lot more. This is the fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=1662656 This has become more urgent now that debuginfod has become the default in rawhide (valgrind supports debuginfod since 3.17.0): https://fedoraproject.org/wiki/Changes/DebuginfodByDefault That also explains your observations, it depends on whether or not DEBUGINFOD_URLS is set in the environment (and whether elfutils-debuginfod-client is installed). I'll work on making valgrind fast again, as far as valgrind is fast to begin with :) Cheers, Mark _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
