From 5472ed3e9bc23eff0b4e457fe564ac667cb69441 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Thu, 15 Sep 2016 11:23:25 -0400
Subject: [PATCH] Make min_parallel_relation_size's default value
 platform-independent.

The documentation states that the default value is 8MB, but this was
only true at BLCKSZ = 8kB, because the default was hard-coded as 1024.
Make the code match the docs by computing the default as 8MB/BLCKSZ.

Oversight in commit 75be66464, noted pursuant to a gripe from Peter E.

Discussion: <90634e20-097a-e4fd-67d5-fb2c42f0dd71@2ndquadrant.com>
---
 src/backend/utils/misc/guc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index c72bd6190a0..ce4eef950b4 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -2758,7 +2758,7 @@ static struct config_int ConfigureNamesInt[] =
 			GUC_UNIT_BLOCKS,
 		},
 		&min_parallel_relation_size,
-		1024, 0, INT_MAX / 3,
+		(8 * 1024 * 1024) / BLCKSZ, 0, INT_MAX / 3,
 		NULL, NULL, NULL
 	},
 
-- 
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