| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Noah Misch <noah(at)leadboat(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, pgsql-committers(at)postgresql(dot)org |
| Subject: | Re: pgsql: Improve performance of SendRowDescriptionMessage. |
| Date: | 2017-10-13 02:44:20 |
| Message-ID: | 12267.1507862660@sss.pgh.pa.us |
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Noah Misch <noah(at)leadboat(dot)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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