From 333b4a45f1d984bd7f32aecb1ba551feed088ec4 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Wed, 20 Oct 2010 00:55:16 +0000
Subject: [PATCH] Cache most recent relfilenode lookups, for speed, after
report of pg_upgrade slowness for 150k tables.
---
contrib/pg_upgrade/info.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/contrib/pg_upgrade/info.c b/contrib/pg_upgrade/info.c
index a8d0bddc191..946e6ccb6ba 100644
--- a/contrib/pg_upgrade/info.c
+++ b/contrib/pg_upgrade/info.c
@@ -423,11 +423,21 @@ relarr_lookup_rel(RelInfoArr *rel_arr,
const char *nspname, const char *relname,
Cluster whichCluster)
{
- int relnum;
+ static int relnum = 0;
if (!rel_arr || !relname)
return NULL;
+ /* Test most recent lookup first, for speed */
+ if (strcmp(rel_arr->rels[relnum].nspname, nspname) == 0 &&
+ strcmp(rel_arr->rels[relnum].relname, relname) == 0)
+ return &rel_arr->rels[relnum];
+
+ if (relnum + 1 < rel_arr->nrels &&
+ strcmp(rel_arr->rels[relnum + 1].nspname, nspname) == 0 &&
+ strcmp(rel_arr->rels[relnum + 1].relname, relname) == 0)
+ return &rel_arr->rels[relnum + 1];
+
for (relnum = 0; relnum < rel_arr->nrels; relnum++)
{
if (strcmp(rel_arr->rels[relnum].nspname, nspname) == 0 &&
--
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