[PATCHES] ISM shared memory on solaris

[Josh Wilmes]

I hope this is the right place to send this.. the FAQ in the 
distribution mentions http://www.PostgreSQL.org/bugs/bugs.php, which 
doesn't work.

We've found that postgresql wasn't using ISM shared memory on solaris, 
which theoretically would cost performance.   The root cause in our case 
was that the "solaris" define is not defined by our compilers or by 
postgresql itself.

The patch below simple has it check SHM_SHARE_MMU instead, which should 
work fine.   I verified (with 'pmap') that the database is now using ISM 
 on its shared memory, after this patch was applied.

--Josh



--- sysv_shmem.c.orig   2002-09-04 13:31:24.000000000 -0700
+++ sysv_shmem.c        2003-10-23 12:52:26.756765000 -0700
@@ -143,7 +143,7 @@
        on_shmem_exit(IpcMemoryDelete, Int32GetDatum(shmid));
        /* OK, should be able to attach to the segment */
-#if defined(solaris) && defined(__sparc__)
+#if defined(SHM_SHARE_MMU) && defined(__sparc__)
        /* use intimate shared memory on SPARC Solaris */
        memAddress = shmat(shmid, 0, SHM_SHARE_MMU);
 #else
@@ -323,8 +323,8 @@
                shmid = shmget(NextShmemSegID, sizeof(PGShmemHeader), 0);
                if (shmid < 0)
                        continue;                       /* failed: must 
be some other app's */
-
-#if defined(solaris) && defined(__sparc__)
+
+#if defined(SHM_SHARE_MMU) && defined(__sparc__)
                /* use intimate shared memory on SPARC Solaris */
                memAddress = shmat(shmid, 0, SHM_SHARE_MMU);
 #else



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