* [Bug default/19658] New: Type canonicalization slow for the 2nd binary being loaded
@ 2016-01-01 0:00 dodji at redhat dot com
2016-01-01 0:00 ` [Bug default/19658] " dodji at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: dodji at redhat dot com @ 2016-01-01 0:00 UTC (permalink / raw)
To: libabigail
https://sourceware.org/bugzilla/show_bug.cgi?id=19658
Bug ID: 19658
Summary: Type canonicalization slow for the 2nd binary being
loaded
Product: libabigail
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: default
Assignee: dodji at redhat dot com
Reporter: dodji at redhat dot com
CC: libabigail at sourceware dot org
Target Milestone: ---
This issue has first been reported downstream in Fedora at
https://bugzilla.redhat.com/show_bug.cgi?id=1309400.
Basically, the reporter does this:
abipkgdiff --d1 nss-debuginfo-3.19.1-8.el6_7.i686.rpm --d2
nss-debuginfo-3.21.0-0.1.el6_7.i686.rpm nss-3.19.1-8.el6_7.i686.rpm
nss-3.21.0-0.1.el6_7.i686.rpm
And it takes forever.
After looking into it a bit deeper, I think what takes a long time is the
comparison of the libnssckbi.so shared library embedded in that package.
In particular, it looks canonicalizing certain class types from the *second*
binary being loaded takes a lot of time.
Moreover, those class types are duplicated (present in several translation unit
of the shared library), so canonicalizing them over and over again takes even
more time.
It looks like the ODR-based optimization to speed up type canonicalization is
not effective in the scenario.
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* [Bug default/19658] Type canonicalization slow for the 2nd binary being loaded
2016-01-01 0:00 [Bug default/19658] New: Type canonicalization slow for the 2nd binary being loaded dodji at redhat dot com
@ 2016-01-01 0:00 ` dodji at redhat dot com
0 siblings, 0 replies; 2+ messages in thread
From: dodji at redhat dot com @ 2016-01-01 0:00 UTC (permalink / raw)
To: libabigail
https://sourceware.org/bugzilla/show_bug.cgi?id=19658
dodji at redhat dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from dodji at redhat dot com ---
This should be fixed by commit
https://sourceware.org/git/gitweb.cgi?p=libabigail.git;a=commit;h=e62901963ff1c48cfc99e0ec1b96d07af47328f4
in the master branch of the git repository.
The fix should be available in the 1.0.rc3 release to come.
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