[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5797 Do not run GC after processing every file.

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• Patch: review --> countdown
• Type: --> Enhancement
• Comment:

Patch on countdown for March 3rd

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[issues:#5797] Do not run GC after processing every file.

Status: Started
Created: Wed Feb 26, 2020 09:39 AM UTC by Han-Wen Nienhuys
Last Updated: Fri Feb 28, 2020 07:50 PM UTC
Owner: Han-Wen Nienhuys

When processing multiple files, we ran GC between the files. The
motivation was that we use a conservative garbage collector, so we get
the most accurate scan when our stack is small. We never measured the
impact of this idea.

On every GC, we pay the cost of tracing through the live set,
ie. fixed data that spans multiple files, and by forcing GC calls, we
trace that data more often than necessary.

We get CPU time savings of ~20 % by not forcing GC.

For GUILE 1.8, the following timings for running "make test-baseline"
on my development branch

force GC on every file

real 3m23.886s
user 8m6.921s

let the GC decide when to collect

real 3m10.523s
user 6m36.925s

For GUILE 2.2, the difference is similar.

https://codereview.appspot.com/579330043

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