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bug#31138: Native json slower than json.el


From: Eli Zaretskii
Subject: bug#31138: Native json slower than json.el
Date: Tue, 16 Apr 2019 18:13:53 +0300

> Cc: address@hidden, address@hidden, address@hidden
> From: Dmitry Gutov <address@hidden>
> Date: Tue, 16 Apr 2019 16:50:58 +0300
> 
> All right, my test script and results are attached. Here's how I run it:
> 
> sudo perf record -F 99 src/emacs -Q --batch -l ~/examples/elisp/json-test.el
> sudo perf report -n --stdio > perf-report.txt

Thanks.  I think we need to run this with a larger JSON, or maybe run
it several times in a loop.  Because there were too few samples in
this run, so we might see a biased picture due to overhead of stuff
that is done only once.

Also, please set gc-cons-threshold and gc-cons-percentage to very
large values, to prevent GC from biasing the profile even more.

> If you have certain recording or output format preferences, please let 
> me know.

The ASCII format is fine.

Was this an optimized build of Emacs or an unoptimized one?





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