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Re: WIP: Fast GiST index build

From: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
To: Alexander Korotkov <aekorotkov(at)gmail(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: WIP: Fast GiST index build
Date: 2011-08-03 16:31:20
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On 03.08.2011 11:18, Alexander Korotkov wrote:
> I found that in previous version of patch I missed PageSetLSN
> and PageSetTLI, but huge amount of WAL is still here. Also I found that huge
> amount of WAL appears only with -O2. With -O0 amount of WAL is ok, but
> messages "FATAL:  xlog flush request BFF11148/809A600 is not satisfied ---
> flushed only to 44/9C518750" appears. Seems that there is some totally wrong
> use of WAL if even optimization level does matter...

Try this:

diff --git a/src/backend/access/gist/gistbuild.c 
index 5099330..5a441e0 100644
--- a/src/backend/access/gist/gistbuild.c
+++ b/src/backend/access/gist/gistbuild.c
@@ -478,7 +478,7 @@ bufferingbuildinsert(GISTInsertState *state,
  		/* Write the WAL record */
  		if (RelationNeedsWAL(state->r))
-			gistXLogUpdate(state->r->rd_node, buffer, oldoffnum, noldoffnum,
+			recptr = gistXLogUpdate(state->r->rd_node, buffer, oldoffnum, 
  													itup, ntup,	InvalidBuffer);
  			PageSetLSN(page, recptr);
  			PageSetTLI(page, ThisTimeLineID);

   Heikki Linnakangas

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