MIME-Version: 1.0
From: Rahila Syed <rahilasyed90@gmail.com>
Date: Sat, 1 Mar 2025 10:19:01 +0530
Message-ID: <CAH2L28vHzRankszhqz7deXURxKncxfirnuW68zD7+hVAqaS5GQ@mail.gmail.com>
Subject: Improve monitoring of shared memory allocations
To: PostgreSQL-development <pgsql-hackers@postgresql.org>
Content-Type: multipart/mixed; boundary="0000000000000885dd062f40a522"
Archived-At: <https://www.postgresql.org/message-id/CAH2L28vHzRankszhqz7deXURxKncxfirnuW68zD7%2BhVAqaS5GQ%40mail.gmail.com>
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Hi,

The 0001* patch improved the accounting for the shared memory allocated for
a
hash table during hash_create.
pg_shmem_allocations tracks the memory allocated by ShmemInitStruct, which,
for shared hash tables, only covers memory allocated for the hash
directory
and control structure via ShmemInitHash. The hash segments and  buckets
are allocated using ShmemAllocNoError, which does not attribute the
allocation
to the hash table and also does not add it to ShmemIndex.

Therefore, these allocations are not tracked in pg_shmem_allocations.
To improve this, include the allocation of segments and buckets in the
initial
allocation of the shared memory for the hash table, in ShmemInitHash.

This will result in pg_shmem_allocations representing the total size of the
initial
hash table, including all the buckets and elements, instead of just the
directory
size.

Like ShmemAllocNoError, the shared memory allocated by ShmemAlloc is not
tracked by pg_shmem_allocations.
The 0002* patch replaces most of the calls to ShmemAlloc with
ShmemInitStruct
to associate a name with the allocations and ensure that they get tracked
by
pg_shmem_allocations.

I observed an improvement in total memory allocation by consolidating
initial shared
memory allocations for the hash table. For ex. the allocated size for the
LOCK hash
hash_create decreased from 801664 bytes to 799616 bytes. Please find the
attached
patches, which I will add to the March Commitfest.

Thank you,
Rahila Syed

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<div dir=3D"ltr"><div><br>Hi,<br><br>The 0001* patch improved the accountin=
g for the shared memory allocated for a<br>hash table during hash_create.</=
div><div>pg_shmem_allocations tracks the memory allocated by ShmemInitStruc=
t, which,</div><div>for shared hash tables, only covers memory allocated fo=
r the hash=C2=A0 directory <br>and control structure via ShmemInitHash. The=
 hash segments and=C2=A0 buckets <br>are allocated using ShmemAllocNoError,=
 which does not attribute the=C2=A0 allocation <br>to the hash table and al=
so does not add it to ShmemIndex.</div><div><br></div><div>Therefore, these=
 allocations are not tracked in pg_shmem_allocations. <br>To improve this, =
include the allocation of segments and buckets in the initial</div><div>all=
ocation of the shared memory for the hash table, in ShmemInitHash. <br><br>=
This will result in pg_shmem_allocations representing the total size of the=
 initial <br>hash table,=C2=A0including all the buckets and elements, inste=
ad of just the directory <br>size.<br><br>Like ShmemAllocNoError, the share=
d memory allocated by ShmemAlloc is not <br>tracked by pg_shmem_allocations=
.<br>The 0002* patch replaces most of the calls to ShmemAlloc with ShmemIni=
tStruct <br>to associate a name with the allocations and ensure that they g=
et tracked by <br>pg_shmem_allocations.<br><br>I observed an improvement in=
 total memory allocation by consolidating initial shared<br>memory allocati=
ons for the hash table. For ex. the allocated size for the LOCK hash <br>ha=
sh_create decreased from 801664 bytes to 799616 bytes. Please find the atta=
ched <br>patches, which I will add to the March Commitfest.<br><br>Thank yo=
u,<br>Rahila Syed</div></div>

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Content-Type: application/octet-stream; 
	name="0001-Account-for-initial-shared-memory-allocated-during-h.patch"
Content-Disposition: attachment; 
	filename="0001-Account-for-initial-shared-memory-allocated-during-h.patch"
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Content-Type: application/octet-stream; 
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