Summary

Improve "heap-shrinkage" rate

Metadata

Description

Submitted by Sven Hartrumpf to chicken-hackers:

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) ?

Changes and comments

[2019-06-12 17:18:24 UTC] felix changed type from defect to enhancement

[2019-06-12 17:18:24 UTC] felix changed milestone from someday to 5.2

[2019-12-01 12:29:06 UTC] sjamaan wrote:

After messing around with this code a bit, but the confusing part is that "count" refers to the used amount of bytes, but as far as I can tell, heap_size is the full heap size (both halves).

[2019-12-12 16:13:37 UTC] sjamaan changed status from new to closed

[2019-12-12 16:13:37 UTC] sjamaan set resolution to fixed

[2019-12-12 16:13:37 UTC] sjamaan wrote:

Fixed with 160fb5198a9cf24c2bee79a0058034824a275abf