** Changed in: libhybris (Ubuntu)
Status: In Progress => Triaged
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https://bugs.launchpad.net/bugs/1343198
Title:
[performance] Mir spends 12%+ CPU time in get_hooked_symbol
(libhybris-common) comparing strings
Status in Mir:
Invalid
Status in “libhybris” package in Ubuntu:
Triaged
Bug description:
On the N4, Mir spends 12%+ CPU time in get_hooked_symbol (libhybris-
common). Actually callgrind can't decide; it's somewhere between 12%
and 46000% ;)
So it's big. Looking at the hybris code, there's a rather large
bottleneck that's obvious: get_hooked_symbol does a linear search
(many times) of a large list of strings using strcmp alone. That's why
22132 calls to get_hooked_symbol are yielding over 5 million calls to
strcmp.
Upstream hybris appears to have been modified to use a cache/hashing
instead of the ugly linear search we have.
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