Re: XLogFlush invoked about twice as much after 9.2 group commit enhancement - Mailing list pgsql-hackers

From Peter Geoghegan
Subject Re: XLogFlush invoked about twice as much after 9.2 group commit enhancement
Date
Msg-id CAM3SWZS3OPaa=yCOmi4iXOSjktCN3g7Yx_itne68fMMNnQd9QA@mail.gmail.com
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In response to Re: XLogFlush invoked about twice as much after 9.2 group commit enhancement  (Jeff Janes <jeff.janes@gmail.com>)
Responses Re: XLogFlush invoked about twice as much after 9.2 group commit enhancement
List pgsql-hackers
On Tue, May 7, 2013 at 12:48 PM, Jeff Janes <jeff.janes@gmail.com> wrote:
> Anyway, I don't see this behavior change when turning on wal_debug and
> looking in the logfiles for 'xlog flush request' messages.

That could have everything to do with the hardware you're using. In
general, the higher the cost of an fsync, the more useful it is to
amortize that cost among concurrently committing transactions.


-- 
Peter Geoghegan



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