Re: Write lifetime hints for NVMe

From: Dmitry Dolgov <9erthalion6(at)gmail(dot)com>
To: Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Write lifetime hints for NVMe
Date: 2018-01-27 19:06:11
Message-ID: CA+q6zcUn7F7MRo8o2aLu11R6qJVWN3gVi+QTEFzrK6PsdACsow@mail.gmail.com
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> On 27 January 2018 at 16:03, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
>
> Aren't those numbers far lower that you'd expect from NVMe storage? I do
> have a NVMe drive (Intel 750) in my machine, and I can do thousands of
> transactions on it with two clients. Seems a bit suspicious.

Maybe an NVMe storage can provide much higher numbers in general, but there are
resource limitations from AWS itself. I was using c5.large, which is the
smallest possible instance of type c5, so maybe that can explain absolute
numbers - but anyway I can recheck, just in case if I missed something.

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