From: mk via ruby-core <ruby-core@ml.ruby-lang.org>
To: ruby-core@ml.ruby-lang.org
Cc: mk <noreply@ruby-lang.org>
Subject: [ruby-core:117432] [Ruby master Feature#20408] Add heap_live_slots to GC.stat_heap
Date: Wed, 03 Apr 2024 14:24:53 +0000 (UTC) [thread overview]
Message-ID: <redmine.issue-20408.20240403142453.51782@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-20408.20240403142453.51782@ruby-lang.org
Issue #20408 has been reported by mk (Matthias Käppler).
----------------------------------------
Feature #20408: Add heap_live_slots to GC.stat_heap
https://bugs.ruby-lang.org/issues/20408
* Author: mk (Matthias Käppler)
* Status: Open
----------------------------------------
`GC.stat` exposes a `heap_live_slots` metric that returns the number of live objects occupying eden slots.
Because the slot size was fixed to `RVALUE_SIZE`, this allowed for some basic approximations of how many bytes were live/in-use (`heap_live_slots * RVALUE_SIZE`).
This could furthermore be "embellished" by adding malloc'ed memory for those objects that were larger than a 40B slot (we track this via a custom CRuby patch).
However, with the addition of Variable Width Allocations (https://bugs.ruby-lang.org/issues/18239), this does not work anymore because we don't know how `heap_live_slots` distributes over all pools that use different slot sizes.
This could be addressed by also adding `heap_live_slots` (and for symmetry: `heap_free_slots`) to `GC.stat_heap`.
The sum of all live slots per pool times its respective slot size should equal `GC.stat[:heap_live_slots]`.
--
https://bugs.ruby-lang.org/
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next parent reply other threads:[~2024-04-03 14:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-03 14:24 mk via ruby-core [this message]
2024-04-03 15:40 ` [ruby-core:117433] [Ruby master Feature#20408] Add heap_live_slots to GC.stat_heap peterzhu2118 (Peter Zhu) via ruby-core
2024-04-04 5:50 ` [ruby-core:117440] " mk via ruby-core
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