[Chicken-janitors] #1379: Improve "heap-shrinkage" rate

[Chicken Trac]

#1379: Improve "heap-shrinkage" rate
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 Reporter:  felix           |                 Owner:
     Type:  defect          |                Status:  new
 Priority:  minor           |             Milestone:  someday
Component:  core libraries  |               Version:  4.12.0
 Keywords:  gc heap         |  Estimated difficulty:  trivial
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 Submitted by Sven Hartrumpf to chicken-hackers:

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 I would like to experiment with heap shrinking (-:hs) for long
 running, memory/GC intensive processes.

 I checked runtime.c and I read the following shrink condition:

 count < percentage(percentage(heap_size, C_heap_shrinkage),
  DEFAULT_HEAP_SHRINKAGE_USED)

 This would imply that heap usage must be < 12.5 % to lead to a heap
 shrink because C_heap_shrinkage (via DEFAULT_HEAP_SHRINKAGE) is 50 %
 and DEFAULT_HEAP_SHRINKAGE_USED is 25 %.
 This (< 12.5 %) is very unlikely for many applications :-)
 How about:

 count < percentage(heap_size, DEFAULT_HEAP_SHRINKAGE_USED)  ?
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Ticket URL: <https://bugs.call-cc.org/ticket/1379>
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