https://sourceware.org/bugzilla/show_bug.cgi?id=20447
Bug ID: 20447
Summary: Slow linking with locale set to *.UTF-8
Product: binutils
Version: 2.24
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: pasko at chromium dot org
CC: ian at airs dot com
Target Milestone: ---
shell> locale
LANG=en_US.UTF-8
LANGUAGE=en_US:
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=
No short reproducer here, sorry. This was revealed during linking of Chrome for
Android (see instructions at [1]). We applied a workaround [2] when we noticed
that setting LC_ALL=C speeds things up by a factor of around 2.
The workaround was found by doing:
shell> perf record --pid=$PID_OF_LD_GOLD
Then 'perf report' said that >50% of perf samples had a call to
"__gconv_transform_utf8_internal", which looks like a performance bug.
References:
[1] build instructions for chrome_public_apk
https://www.chromium.org/developers/how-tos/android-build-instructions
[2] Set LC_ALL=C for chrome link wrapper
https://codereview.chromium.org/2190813002/
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