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Re: Larger GC thresholds for non-interactive Emacs

From: Ihor Radchenko
Subject: Re: Larger GC thresholds for non-interactive Emacs
Date: Mon, 20 Jun 2022 20:21:24 +0800

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> When we increase the threshold, free increases up to some value, but
>> that value is limited by the underlying code:
> A clarification: when you see
>     [...]
>     GC-898 p=1.0 total=18.7M free=7.3M thresold=18.7M
>     GC-898 p=1.0 total=18.8M free=7.3M thresold=18.8M
>     [...]
> ...

Thanks! I was totally misreading the results.

> The difference between the two cases is that when you have half of the
> heap made up of dead objects, there's a higher probability that some of
> those objects are clustered such that they make up a few complete
> 16kB blocks, whereas when only the dead objects represent only 10% of
> the heap, almost all 16kB blocks will contain a mis of dead and live
> objects and hence can't be returned to the malloc library.

I am again confused.
Does what you say imply that frequent GC with small threshold is not
good because it will have less dead objects and have higher chance of


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