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 ad351542347ff63d2df691776c10aa2fcde04165..10d3d6e7edb9e8f73811090ab0e729915aa20ee5 100644 (file)
--- a/src/backend/storage/ipc/ipc.c
+++ b/src/backend/storage/ipc/ipc.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipc.c,v 1.77 2002/03/06 06:10:05 momjian Exp $
+ *       $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipc.c,v 1.78 2002/04/13 19:52:51 momjian Exp $
  *
  * NOTES
  *
@@ -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;