[Bug 1894453] Re: Building Ceph packages with RelWithDebInfo

[Corey Bryant]

** Also affects: ceph (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: ceph (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: ceph (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: ceph (Ubuntu Bionic)
   Importance: Undecided => Medium

** Changed in: ceph (Ubuntu Focal)
   Importance: Undecided => Medium

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

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/train
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/queens
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/ussuri
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/stein
   Importance: Undecided
       Status: New

** Changed in: cloud-archive
       Status: New => Fix Released

** Changed in: cloud-archive
       Status: Fix Released => Invalid

** Changed in: cloud-archive/queens
       Status: New => Triaged

** Changed in: cloud-archive/stein
       Status: New => Triaged

** Changed in: cloud-archive/ussuri
   Importance: Undecided => Medium

** Changed in: cloud-archive/stein
   Importance: Undecided => Medium

** Changed in: cloud-archive/train
       Status: New => Triaged

** Changed in: cloud-archive/queens
   Importance: Undecided => Medium

** Changed in: cloud-archive/ussuri
       Status: New => Triaged

** Changed in: cloud-archive/train
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1894453

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:
  Triaged

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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