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[PATCH 0/1] Prevent excessive major gcs by preserving a decent amount of


From: Evan Hanson
Subject: [PATCH 0/1] Prevent excessive major gcs by preserving a decent amount of unused heap
Date: Sun, 29 Mar 2020 10:10:13 +1300

Hi there,

I've played around with this first patch a bit, and I think I've found a
way to apply the same technique without complicating the logic in
C_reclaim(). Attached is a sign-off of megane's patch that introduces
the same min-free requirement, but only at the point where reallocations
are triggered. This actually gives a minor performance improvement over
the initial version (which itself is a significant improvement over
master), and it's a less invasive change because it leaves the heap
resizing logic unchanged.

Here are the benchmarks -- review-0001 (in the middle) is the original
patch, and review-1001 (on the right) is this version:

  http://paste.call-cc.org/paste?id=bdadc47d53512e46e563af1830a7bf6b276eb378

(I also played around with the initial and min-free heap values but
couldn't find any improvements that way.)

megane, could you please have a look at this version and confirm the
results? I'm keen to get this reduction in major GCs, so I'm hoping a
simpler version of the patch is OK.

Cheers,

Evan



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