Just to be clear: Ceph still uses tcmalloc on RHEL/CentOS, but we can
no longer rely on built-in tcmalloc packages and have to do it
ourselves. That's why qemu no longer uses tcmalloc (but Ceph does).
See:
https://bugzilla.redhat.com/show_bug.cgi?id=1717414
Mark
On 11/6/23 11:20, Mark Nelson wrote:
Glad to hear it! FWIW, I noticed a pretty big improvement in VM
performance with lbrbd when qemu was set to use tcmalloc vs
LD_PRELOAD. RHEL dropped support for tcmalloc entirely but if you guys
have the ability to compile qemu with tcmalloc support in
Debian/Ubuntu I suspect you'll see a nice client side win.
Mark
On 11/6/23 07:35, Dan Hill wrote:
Very much a side note: At once point the Ubuntu (and I think
Debian)
packages weren't being built with tcmalloc support. I talked to
Chris
Macnaughton about it back at Cephalocon and he verified it was
the case
for the Ubuntu packages, but he's moved on and is no longer at
Canonical. It would be nice to verify if this is still (or for
Debian
ever was) the case and get it resolved.
Thanks again for bringing this to our attention. We resolved the
build issue with tcmalloc in Ubuntu packages.
The regression was introduced when Ubuntu enabled the crimson backend
for testing [0]. This regression only impacted Ubuntu, not Debian.
[0]
https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/2016845/comments/4
<https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/2016845/comments/4>
On Mon, Oct 2, 2023 at 7:24 PM Mark Nelson <mark.nelson@xxxxxxxxx
<mailto:mark.nelson@xxxxxxxxx>> wrote:
On 9/29/23 11:01, Bernd Zeimetz wrote:
> When I started looking into ceph I've removed lots of stuff
from the
> debian folder that the ubuntu people added for unknown
reasons, its
> much closer to upstream these days then it was before.
Actually close
> enough that it is no problem to switch to the upstream packages
at all.
Very much a side note: At once point the Ubuntu (and I think
Debian)
packages weren't being built with tcmalloc support. I talked to
Chris
Macnaughton about it back at Cephalocon and he verified it was
the case
for the Ubuntu packages, but he's moved on and is no longer at
Canonical. It would be nice to verify if this is still (or for
Debian
ever was) the case and get it resolved.
Mark
-- Best Regards,
Mark Nelson
Head of Research and Development
Clyso GmbH
p: +49 89 21552391 12 | a: Minnesota, USA
w: https://clyso.com <https://clyso.com> | e: mark.nelson@xxxxxxxxx
<mailto:mark.nelson@xxxxxxxxx>
We are hiring: https://www.clyso.com/jobs/
<https://www.clyso.com/jobs/>
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--
Best Regards,
Mark Nelson
Head of Research and Development
Clyso GmbH
p: +49 89 21552391 12 | a: Minnesota, USA
w: https://clyso.com | e: mark.nelson@xxxxxxxxx
We are hiring: https://www.clyso.com/jobs/
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To unsubscribe send an email to dev-leave@xxxxxxx
