[Bug 1894453] Re: Building Ceph packages with RelWithDebInfo
Tyler Stachecki
1894453 at bugs.launchpad.net
Mon Sep 14 17:01:35 UTC 2020
Good to know it's just rocksdb!
Has Canonical also considered compiling the source code with -DNDEBUG to
align with what appears to be the upstream default set of RelWithDebInfo
flags? The Ceph source code is quasi-judicious about its use of
`ceph_assert`, which is effectively compiled out when -DNDEBUG is
specified.
I am unsure of the performance benefit of this in particular.
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https://bugs.launchpad.net/bugs/1894453
Title:
Building Ceph packages with RelWithDebInfo
Status in ceph package in Ubuntu:
In Progress
Bug description:
This is to consider/discuss the possibility of whether the Ceph
packages (UCA) should be built with RelWithDebInfo build option
(CMAKE_BUILD_TYPE [0]) which can be supplied to the build script
do_cmake.sh [1].
Currently, Upstream as well as UCA builds default to 'Debug' [0]
builds. But is any reason why shouldn't go for RelWithDebInfo (i.e.
"Release with Debug information")?
There's one issue noted with RelWithDebInfo which has a workaround too [2].
In general, gcc's -O2 [3] build should generate better code as well as
there's a specific case for Ceph [4] that it improves performance.
[0] https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html
[1] https://github.com/ceph/ceph/blob/master/do_cmake.sh
[2] https://docs.ceph.com/docs/master/dev/perf/#common-issues
[3] https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
[4] https://bugs.gentoo.org/show_bug.cgi?id=733316
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