Public bug reported:
When apport takes a core dump of a large application, it uses 100% CPU
for a _long_ time (often 30 seconds or more) to compress the core dump.
The system is virtually unusable during this time, especially if the
application was the window manager and won’t be restarted until the core
dump is complete.
This is a longstanding known problem; it motivated the switch from bzip2
to zlib level 9 back in apport 0.24. That made it much better, but it’s
still quite bad. So why not switch from zlib level 9 to zlib level 1?
I tested this on a core dump of gnome-shell, and while it increased the
size of the .crash file by 24% (68.5 MB to 85.0 MB), it decreased the
needed CPU time by a FACTOR OF EIGHT (58.6 seconds to 7.3 seconds). This
tradeoff seems more than worthwhile for this use case.
** Affects: apport
Importance: Undecided
Status: New
** Affects: apport (Ubuntu)
Importance: Undecided
Status: New
** Tags: patch
** Patch added: "apport_2.19.3-0ubuntu3_zlib-level-1.debdiff"
https://bugs.launchpad.net/bugs/1537635/+attachment/4556055/+files/apport_2.19.3-0ubuntu3_zlib-level-1.debdiff
** Tags added: patch
** Also affects: apport
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1537635
Title:
Reduce zlib compression level for massive performance increase
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