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perf: add perfprogress command
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Authored by indygreg on Dec 10 2018, 3:15 PM.

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rHG008f3491dc53: perf: add perfprogress command
Summary

I've noticed that progress bars can add significant overhead to tight
loops. Let's add a perf command that attempts to isolate that overhead.

With a default hgrc, iteration over 1M items appears to take ~3.75s on
my machine. Profiling reveals ~28% of time is spent in ui.configbool()
resolving the value of the progress.debug config option.

Even if I set progress.disable=true, execution still takes ~2.60s, with
~59% of the time spent in ui.configbool().

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indygreg created this revision.Dec 10 2018, 3:15 PM
This revision was automatically updated to reflect the committed changes.