Lower stack chunk size in RTS to reduce thread STACK memory (closes #5190) #5214
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…asura#5190) This reduces memory consumption for new idle subscriptions significantly (see linked ticket). The hypothesis is: we fork a lot of threads per websocket, and some of these use slightly more than the initial 1K stack size, so the first overflow balloons to 32K, when significantly less is required. However: running with `+RTS -K1K -xc` did not seem to show evidence of any overflows! So it's a mystery why this improves things. GHC should probably also be doubling the stack buffer at each overflow or doing something even smarter; the knobs we have aren't so helpful.
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Jun 26, 2020
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Review app for commit 1dbe5cd deployed to Heroku: https://hge-ci-pull-5214.herokuapp.com |
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Review app https://hge-ci-pull-5214.herokuapp.com is deleted |
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Broke out this simple commit from this other PR that had a larger change still under discussion: #5191 (review)
Closes #5190