[Bug 1894453] Re: Building Ceph packages with RelWithDebInfo

[Brian Murray]

>From the bug description its not clear to me why this change should be
SRU'ed to Focal or what the benefit to end users is. Could someone
please elaborate on that? Thanks!

** Changed in: ceph (Ubuntu Focal)
       Status: Triaged => Incomplete

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Title:
  Building Ceph packages with RelWithDebInfo

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in Ubuntu Cloud Archive stein series:
  Triaged
Status in Ubuntu Cloud Archive train series:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in ceph package in Ubuntu:
  Fix Released
Status in ceph source package in Bionic:
  Triaged
Status in ceph source package in Focal:
  Incomplete

Bug description:
  [Impact]
  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

  [Test Case]
  Standard ceph-backed OpenStack regression will be run, consisting of juju-deployed OpenStack+ceph and tempest regression testing against the deployment.

  [Regression Potential]
  As Ponnuvel mentioned, the size of binaries will be slightly bigger and also the build/compilation will be longer.
  Ponnuvel also did a search of pponnuvel i'd search of upstream bugs at https://tracker.ceph.com and didn't find any relevant bugs.

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