[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5681 Instrument and improve GC time

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Fails make

...
Making lily/out/main.o < cc
Making lily/out/dynamic-align-engraver.o < cc
Making lily/out/grob-info.o < cc
Making lily/out/stencil-interpret.o < cc
/home/james/lilypond-git/lily/main.cc: In function 'void setup_guile_v2_env()':
/home/james/lilypond-git/lily/main.cc:769:6: error: 'GC_free_space_divisor' was not declared in this scope
      GC_free_space_divisor = 1;
      ^~~~~~~~~~~~~~~~~~~~~
/home/james/lilypond-git/build/../stepmake/stepmake/c++-rules.make:4: recipe for target 'out/main.o' failed
make[1]: *** [out/main.o] Error 1
make[1]: *** Waiting for unfinished jobs....
/home/james/lilypond-git/build/../stepmake/stepmake/generic-targets.make:6: recipe for target 'all' failed
make: *** [all] Error 2

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[issues:#5681] Instrument and improve GC time

Status: Started
Created: Fri Jan 24, 2020 09:48 AM UTC by Han-Wen Nienhuys
Last Updated: Fri Jan 24, 2020 10:03 AM UTC
Owner: Han-Wen Nienhuys

Setting GC_free_space_divisor to 1 decreases GC time on GUILE v2 from
2.1s to 1.75s, a 17% speedup for the Mozart horn concerto example

Don't try to tune the GUILE 1.8 GC if we are on GUILE 2.

https://codereview.appspot.com/577380043

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