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add a compile-time option to enable 4k page sizes #52229

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merged 1 commit into from
Nov 22, 2023

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@d-netto d-netto commented Nov 19, 2023

We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC, since that improves memory utilization considerably for us.

Drawback is that this may increase the number of madvise system calls in the sweeping phase by a factor of 4, but concurrent page sweeping should help with some of that.

@d-netto d-netto added the GC Garbage collector label Nov 19, 2023
@d-netto d-netto force-pushed the dcn-option-4-small-pages branch 7 times, most recently from b7b48af to c5e3618 Compare November 22, 2023 00:49
@gbaraldi
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Can you measure a significant performance overhead? But it LGTM it's similar to #50600 which was going in the other way

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d-netto commented Nov 22, 2023

I believe it can make sweep times worse in the multithreaded binary tree GCBenchmarks. That's the cost of the increased number of madvise calls.

@d-netto d-netto merged commit 85e3da0 into master Nov 22, 2023
5 of 7 checks passed
@d-netto d-netto deleted the dcn-option-4-small-pages branch November 22, 2023 14:26
d-netto added a commit to RelationalAI/julia that referenced this pull request Nov 28, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Nov 28, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Nov 28, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Nov 29, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Dec 4, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Dec 5, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Dec 5, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Dec 5, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Dec 5, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Dec 5, 2023
…111)

We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
Drvi pushed a commit to RelationalAI/julia that referenced this pull request Dec 7, 2023
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Jan 17, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Jan 18, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Jan 23, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Jan 24, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Jan 25, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Jan 27, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Jan 30, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Jan 31, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Feb 1, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Feb 6, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Feb 7, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Feb 14, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Feb 21, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Feb 22, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
Drvi pushed a commit to RelationalAI/julia that referenced this pull request Feb 28, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Mar 1, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Mar 13, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
Drvi pushed a commit to RelationalAI/julia that referenced this pull request Apr 3, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
d-netto added a commit to RelationalAI/julia that referenced this pull request Apr 16, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Apr 23, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Apr 24, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Apr 30, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request Apr 30, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request May 2, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request May 9, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request May 19, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request May 26, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request May 28, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
DelveCI pushed a commit to RelationalAI/julia that referenced this pull request May 29, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
Drvi pushed a commit to RelationalAI/julia that referenced this pull request Jun 7, 2024
We're suffering from heavy fragmentation in some of our workloads.

Add a build-time option to enable 4k pages (instead of 16k) in the GC,
since that improves memory utilization considerably for us.

Drawback is that this may increase the number of `madvise` system calls
in the sweeping phase by a factor of 4, but concurrent page sweeping
should help with some of that.
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2 participants