Add logic to get node's real memory size on AIX.

Add LDFLAGS required on AIX to use dlopen().

NEWS

@@ -3,6 +3,7 @@ documents those changes that are of interest to users and admins.
 
 * Changes in SLURM 0.3.0.0-pre7 (not tagged yet)
 ===============================
+ -- Add support for getting node's real memory size on AIX
 
 * Changes in SLURM 0.3.0.0-pre6
 ===============================

configure.ac

@@ -41,13 +41,21 @@ AC_CHECK_HEADERS(mcheck.h values.h socket.h sys/socket.h  \
                  stdbool.h sys/ipc.h sys/shm.h sys/sem.h errno.h \
                  stdlib.h dirent.h pthread.h sys/prctl.h \
                  sysint.h inttypes.h termcap.h netdb.h sys/socket.h  \
+                 sys/systemcfg.h \
 		 )
 AC_HEADER_SYS_WAIT
 AC_HEADER_TIME
 AC_HEADER_STDC
 
+
 dnl Checks for structures.
 dnl
+AC_TRY_COMPILE([#include <sys/systemcfg.h>], 
+   [double x = _system_configuration.physmem;],
+   [AC_DEFINE(HAVE__SYSTEM_CONFIGURATION, 1,
+             [Define to 1 if you have the external variable,
+              _system_configuration with a member named physmem.])])
+
 
 dnl check to see if glibc's program_invocation_short_name is available:
 dnl
@@ -92,6 +100,10 @@ LDFLAGS="$LDFLAGS "
 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 LIBS="$PTHREAD_LIBS $LIBS"
 
+case "$host" in
+  *-*-aix*) LDFLAGS="$LDFLAGS -Wl,-brtl -Wl,-bexpall " ;;
+esac
+
 AC_SLURM_SEMAPHORE
 
 dnl checks for system services.

src/slurmd/get_mach_stat.c

@@ -33,6 +33,10 @@
 #  include "config.h"
 #endif
 
+#ifdef HAVE_SYS_SYSTEMCFG_H
+# include <sys/systemcfg.h>
+#endif
+ 
 #include <errno.h>
 #include <fcntl.h> 
 #include <stdio.h>
@@ -168,12 +172,16 @@ get_memory(uint32_t *real_memory)
 
 	*real_memory = 1;
 	pages = sysconf(_SC_PHYS_PAGES);
+
+#ifdef HAVE__SYSTEM_CONFIGURATION
+	/* Works for AIX */
+	if (pages < 1) {
+		*real_memory = _system_configuration.physmem / (1024 * 1024);
+		return 0;
+	}
+#endif
+
 	if (pages < 1) {
-		/* This error is expected on AIX and the real memory size is 
-		 * available only from /dev/kmem at this time, which involves
-		 * a fair bit of code to use. If anyone is interested in
-		 * adding this support, take a look at the program "monitor": 
-		 * http://www.mesa.nl/monitor */
 		error ("get_memory: error running sysconf(_SC_PHYS_PAGES)\n");
 		return EINVAL;
 	}