Re: About asynchronous I/O

Very usefull on SSD AND nvme ! (low latency on IOPs). But the higher the disk latency, the greater the gains you will notice.

On SSD i observed 200%

> Le 23 juin 2026 à 14:02, Ron Johnson <ronljohnsonjr(at)gmail(dot)com> a écrit :
>
> On Tue, Jun 23, 2026 at 7:26 AM bertrand HARTWIG <hartwig(dot)bertrand(at)gmail(dot)com <mailto:hartwig(dot)bertrand(at)gmail(dot)com>> wrote:
>> Hello,
>>
>> The size of the database is clearly not important.
>>
>> What matters are queries that are not already cached and that perform I/O.
>>
>> With async I/O, you can see I/O performance improvements of up to 200%–300%. The higher the disk latency, the greater the gains you will notice.
>>
>
> So, not so useful on SSD/NVMe?
>
>> Regards,
>>
>> Bertrand
>>
>>
>>> Le 23 juin 2026 à 09:55, ek ek <livadidrive(at)gmail(dot)com <mailto:livadidrive(at)gmail(dot)com>> a écrit :
>>>
>>> Hello everyone,
>>> Are any of you running PostgreSQL 18 on production environments sized between 1 to 3TB? Does the 'asynchronous I/O (AIO) subsystem' deliver a significant performance increase? Also, has anyone had the opportunity to benchmark it against v17?
>>
>
>
>
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