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* Re: [EXTERNAL] RDS IO Read time
@ 2025-03-31 18:30 Eden Aharoni <[email protected]>
2025-03-31 18:43 ` Re: [EXTERNAL] RDS IO Read time Christophe Pettus <[email protected]>
0 siblings, 1 reply; 4+ messages in thread
From: Eden Aharoni @ 2025-03-31 18:30 UTC (permalink / raw)
To: Christophe Pettus <[email protected]>; +Cc: [email protected] <[email protected]>
Can you please tell me what other data might help? Would you like an EXPLAIN output?
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________________________________
From: Christophe Pettus <[email protected]>
Sent: Monday, March 31, 2025 9:23:45 PM
To: Eden Aharoni <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: [EXTERNAL] RDS IO Read time
> On Mar 31, 2025, at 10:54, Eden Aharoni <[email protected]> wrote:
>
> So you believe it's strictly an EBS issue?
Well, PostgreSQL certainly can read faster than 34MB/s off of disk. With the data you've given, I can't really say if it's purely an EBS issue.
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: [EXTERNAL] RDS IO Read time
2025-03-31 18:30 Re: [EXTERNAL] RDS IO Read time Eden Aharoni <[email protected]>
@ 2025-03-31 18:43 ` Christophe Pettus <[email protected]>
2025-03-31 19:36 ` Re: [EXTERNAL] RDS IO Read time Eden Aharoni <[email protected]>
0 siblings, 1 reply; 4+ messages in thread
From: Christophe Pettus @ 2025-03-31 18:43 UTC (permalink / raw)
To: Eden Aharoni <[email protected]>; +Cc: [email protected] <[email protected]>
> On Mar 31, 2025, at 11:30, Eden Aharoni <[email protected]> wrote:
>
> Can you please tell me what other data might help?
You can show your work on how you got the megabytes/second number. (Be aware that on a general open-source mailing list, there's only so much debugging that we can do of a specific problem that is not a PostgreSQL bug.)
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: [EXTERNAL] RDS IO Read time
2025-03-31 18:30 Re: [EXTERNAL] RDS IO Read time Eden Aharoni <[email protected]>
2025-03-31 18:43 ` Re: [EXTERNAL] RDS IO Read time Christophe Pettus <[email protected]>
@ 2025-03-31 19:36 ` Eden Aharoni <[email protected]>
2025-03-31 20:22 ` Re: [EXTERNAL] RDS IO Read time Christophe Pettus <[email protected]>
0 siblings, 1 reply; 4+ messages in thread
From: Eden Aharoni @ 2025-03-31 19:36 UTC (permalink / raw)
To: Christophe Pettus <[email protected]>; +Cc: [email protected] <[email protected]>
Aggregate (cost=8581.22..8581.23 rows=1 width=4) (actual time=1209.498..1210.530 rows=1 loops=1)
Buffers: shared hit=3108 read=4314 dirtied=1
I/O Timings: shared read=1169.977
-> Gather (cost=8580.80..8581.21 rows=4 width=8) (actual time=1209.371..1210.526 rows=5 loops=1)
Workers Planned: 4
Workers Launched: 4
Buffers: shared hit=3108 read=4314 dirtied=1
I/O Timings: shared read=1169.977
-> Aggregate (cost=7580.80..7580.81 rows=1 width=8) (actual time=1206.518..1206.520 rows=1 loops=5)
Buffers: shared hit=3105 read=4314 dirtied=1
I/O Timings: shared read=1169.977
-> Hash Join (cost=2620.70..7578.45 rows=937 width=0) (actual time=148.965..1206.330 rows=1897 loops=5)
Buffers: shared hit=3105 read=4314 dirtied=1
I/O Timings: shared read=1169.977
-> Index Only Scan using IX_Collaborators_TenantId_IsDeleted_RunningIndex on Collaborators c (cost=0.55..4619.26 rows=11407 width=80) (actual time=2.815..1058.793 rows=7474 loops=5)
Index Cond: ((c."TenantId" = '0f8026c775a5499fdd3ccd193a15f94c3b4ae58a'::text) AND (c."IsDeleted" = false))
Heap Fetches: 3711
Buffers: shared hit=2332 read=3563
I/O Timings: shared read=1028.548
-> Hash (cost=2479.01..2479.01 rows=11292 width=79) (actual time=144.988..144.989 rows=1983 loops=5)
Buffers: shared hit=637 read=751 dirtied=1
I/O Timings: shared read=141.429
-> Index Only Scan using IX_IntegrationCollaboration_TenantId_IsIntegrationDeleted_IsDe~ on IntegrationCollaboration i (cost=0.55..2479.01 rows=11292 width=79) (actual time=1.804..144.122 rows=1983 loops=5)
Index Cond: (i."TenantId" = '0f8026c775a5499fdd3ccd193a15f94c3b4ae58a'::text)
Heap Fetches: 112
Buffers: shared hit=637 read=751 dirtied=1
I/O Timings: shared read=141.429
Planning:
Buffers: shared hit=440
Execution time: 1210.592 ms
So we can see here that the query read 4314 blocks in 1.2 sec.. (ive done 4314 * 8kb / 1.2sec which is about 28 MB/s)…
Hope you’ll have any clue 😊
From: Christophe Pettus <[email protected]>
Date: Monday, 31 March 2025 at 21:44
To: Eden Aharoni <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: [EXTERNAL] RDS IO Read time
> On Mar 31, 2025, at 11:30, Eden Aharoni <[email protected]> wrote:
>
> Can you please tell me what other data might help?
You can show your work on how you got the megabytes/second number. (Be aware that on a general open-source mailing list, there's only so much debugging that we can do of a specific problem that is not a PostgreSQL bug.)
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: [EXTERNAL] RDS IO Read time
2025-03-31 18:30 Re: [EXTERNAL] RDS IO Read time Eden Aharoni <[email protected]>
2025-03-31 18:43 ` Re: [EXTERNAL] RDS IO Read time Christophe Pettus <[email protected]>
2025-03-31 19:36 ` Re: [EXTERNAL] RDS IO Read time Eden Aharoni <[email protected]>
@ 2025-03-31 20:22 ` Christophe Pettus <[email protected]>
0 siblings, 0 replies; 4+ messages in thread
From: Christophe Pettus @ 2025-03-31 20:22 UTC (permalink / raw)
To: Eden Aharoni <[email protected]>; +Cc: [email protected] <[email protected]>
> On Mar 31, 2025, at 12:36, Eden Aharoni <[email protected]> wrote:
> Hope you’ll have any clue 😊
Based on that, I'd take it up with AWS. It does seem that the EBS mount is under-performing.
^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~2025-03-31 20:22 UTC | newest]
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2025-03-31 18:30 Re: [EXTERNAL] RDS IO Read time Eden Aharoni <[email protected]>
2025-03-31 18:43 ` Christophe Pettus <[email protected]>
2025-03-31 19:36 ` Eden Aharoni <[email protected]>
2025-03-31 20:22 ` Christophe Pettus <[email protected]>
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