[Bug 1894453] Re: Building Ceph packages with RelWithDebInfo

Tyler Stachecki 1894453 at bugs.launchpad.net
Thu Sep 10 15:45:16 UTC 2020


Oof - so I hacked up debian/rules a little so that "RelWithDebInfo" is
used instead of "None" for CMAKE_BUILD_TYPE.  I then ^C'd the dpkg-
buildpackage after it started compiling the first few source files and
observed that:

  * When doing make V=1 VERBOSE=1 in obj-x86_64-linux-gnu/src/rocksdb
*without* any changes, the source is compiled with *neither* -g nor -O2
-DNDEBUG.

  * When doing make V=1 VERBOSE=1 in obj-x86_64-linux-gnu/src/rocksdb
*with* my changes, rocksdb is built with *both* -g and -O2 -DNDEBUG.

-O2 -DNDEBUG should result in significantly better performance/lower
utilization for metadata operations...

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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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