From: Bruce Momjian <bruce@momjian.us>
Date: Sat, 13 Apr 2002 19:52:51 +0000 (+0000)
Subject: Patch against 7.2.1 sources.  Uses Solaris Intimate Shared Memory
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=593168bf3673b9460faa68b484caddf7c576b31d;p=users%2Fbernd%2Fpostgres.git

Patch against 7.2.1 sources.  Uses Solaris Intimate Shared Memory
for Solaris on SPARC.  Scott Brunza (sbrunza@sonalysts.com) gets
credit for identifying the issue, making the change, and doing
the regression tests.

Earlier testing on 7.2rc2 and 7.2 showed performance gains of
1% to 10% on pgbench, osdb-pg, and some locally developed apps.

Solaris Intimate Shared Memory is described in "SOLARIS INTERNALS
Core Kernel Components" by Jim Mauro and Richard McDougall,
Copyright 2001 Sun Microsystem, Inc.  ISBN 0-13-022496-0

P.J. "Josh" Rovero
---

diff --git a/src/backend/storage/ipc/ipc.c b/src/backend/storage/ipc/ipc.c
index 4dde2a19af..fd6d38f9e9 100644
--- a/src/backend/storage/ipc/ipc.c
+++ b/src/backend/storage/ipc/ipc.c
@@ -632,7 +632,12 @@ InternalIpcMemoryCreate(IpcMemoryKey memKey, uint32 size, int permission)
 	on_shmem_exit(IpcMemoryDelete, Int32GetDatum(shmid));
 
 	/* OK, should be able to attach to the segment */
-	memAddress = shmat(shmid, 0, 0);
+#if defined(solaris) && defined(__sparc__)
+	/* use intimate shared memory on SPARC Solaris */
+	memAddress = shmat(shmid, 0, SHM_SHARE_MMU);
+#else
+ 	memAddress = shmat(shmid, 0, 0);
+#endif
 
 	if (memAddress == (void *) -1)
 	{
@@ -812,7 +817,14 @@ IpcMemoryCreate(uint32 size, bool makePrivate, int permission)
 		shmid = shmget(NextShmemSegID, sizeof(PGShmemHeader), 0);
 		if (shmid < 0)
 			continue;			/* failed: must be some other app's */
-		memAddress = shmat(shmid, 0, 0);
+
+#if defined(solaris) && defined(__sparc__)
+		/* use intimate shared memory on SPARC Solaris */
+		memAddress = shmat(shmid, 0, SHM_SHARE_MMU);
+#else
+ 		memAddress = shmat(shmid, 0, 0);
+#endif
+
 		if (memAddress == (void *) -1)
 			continue;			/* failed: must be some other app's */
 		hdr = (PGShmemHeader *) memAddress;