1849969 - Investigate tuning nursery size for speedometer3 benchmark

Status: REOPENED

(Core :: JavaScript: GC, task, P3)

Description

[Jon Coppeard (:jonco) (PTO until 10th March)]

smaug noticed that we resize the nursery often during the benchmark and found some improvement in the benchmark score with some changes to nursery collection (using a fixed 16MB size and eagerly collecting):

https://treeherder.mozilla.org/perfherder/comparesubtest?originalProject=try&newProject=try&newRevision=e3de12548b25bf18d952d40ed83ac02fd3e21eaf&originalSignature=4586009&newSignature=4586009&framework=13&application=firefox&originalRevision=5173e6287816ace74cb8e34812b0145719d5b98a&page=1&showOnlyConfident=1

This suggests that adjusting the current sizing heuristics for this benchmark could be useful.

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

I don't think this is a dup. We have still the issue that nursery shrinks way too much too easily. And perhaps the max size could be also larger.