Group Commits Vs WAL Writes

From: Atri Sharma <atri(dot)jiit(at)gmail(dot)com>
To: Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Group Commits Vs WAL Writes
Date: 2013-06-27 07:56:59
Message-ID: CAOeZVidRgO9rgWA_xw1MfANX=vn6e-w0jNS6m_7kTLyc4gRbPA@mail.gmail.com
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Hi all,

I think this is a naive question.

When we do a commit, WAL buffers are written to the disk. This has a
disk latency for the required I/O.

Now, with group commits, do we see a spike in that disk write latency,
especially in the cases where the user has set wal_buffers to a high
value?

Regards,

Atri

--
Regards,

Atri
l'apprenant

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