Re: [COMMITTERS] pgsql: Improve performance of SendRowDescriptionMessage. - Mailing list pgsql-committers

From Tom Lane
Subject Re: [COMMITTERS] pgsql: Improve performance of SendRowDescriptionMessage.
Date
Msg-id 12267.1507862660@sss.pgh.pa.us
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In response to Re: [COMMITTERS] pgsql: Improve performance ofSendRowDescriptionMessage.  (Noah Misch <noah@leadboat.com>)
Responses Re: [COMMITTERS] pgsql: Improve performance ofSendRowDescriptionMessage.  (Noah Misch <noah@leadboat.com>)
List pgsql-committers
Noah Misch <noah@leadboat.com> writes:
> On Thu, Oct 12, 2017 at 04:08:44PM -0700, Andres Freund wrote:
>> Noah, any chance you could force restrict to off on that animal?

> I can confirm it allows "make check" to pass.

So that leaves us with two theories:

1. hornet's compiler contains a bug that causes it to misoptimize
in the presence of "restrict".

2. There's a bug in the way HEAD is applying "restrict", which happens
not to manifest on other platforms.

While I have to agree with Andres' evident feeling that it's probably
#1, I do not think we should dismiss #2 without inquiring a bit
harder.  It would be really useful, I think, if we could characterize
exactly how the RowDescription output is broken in that build.
Noah, could you capture some of those messages somehow?
        regards, tom lane


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