start of an admin tool for FreeBSD to help configure shared memory for

that machine

I kept the name as generic as possible though, as other OS should have
similar methods, so this can be extended "as appropriate" ...

1 files changed, 51 insertions, 0 deletions

diff --git a/contrib/ipc_check/ipc_check.pl b/contrib/ipc_check/ipc_check.pl
new file mode 100644
index 0000000000..cc65294718
--- /dev/null
+++ b/contrib/ipc_check/ipc_check.pl
@@ -0,0 +1,51 @@
+#!/usr/bin/perl
+
+# Notes ... -B 1 == 8k
+
+if(@ARGV > 1) {
+  if($ARGV[0] eq "-B") {
+    $buffers = $ARGV[1];
+  }
+}
+
+if($buffers > 0) {
+  $kb_memory_required = $buffers * 8;
+}
+
+$shm = `sysctl kern.ipc | grep shmall`;
+( $junk, $shm_amt ) = split(/ /, $shm);
+chomp($shm_amt);
+$sem = `sysctl kern.ipc | grep semmap`;
+
+print "\n\n";
+if(length($shm) > 0) {
+  printf "shared memory enabled: %d kB available\n", $shm_amt * 4;
+  if($buffers > 0) {
+    if($kb_memory_required / 4 > $shm_amt) {
+      print "\n";
+      print "to provide enough shared memory for a \"-B $buffers\" setting\n";
+      print "issue the following command\n\n";
+      printf "\tsysctl -w kern.ipc.shmall=%d\n", $kb_memory_required / 4;
+      print "\nand add the following to your /etc/sysctl.conf file:\n\n";
+      printf "\tkern.ipc.shmall=%d\n", $kb_memory_required / 4;
+    } else {
+      print "\n";
+      print "no changes to kernel required for a \"-B $buffers\" setting\n";
+    }
+  }
+} else {
+  print "no shared memory support available\n";
+  print "add the following option to your kernel config:\n\n";
+  print "\toptions        SYSVSHM\n\n";
+}
+
+print "\n==========================\n\n";
+if(length($sem) > 0) {
+  print "semaphores enabled\n";
+} else {
+  print "no semaphore support available\n";
+  print "add the following option to your kernel config:\n\n";
+  print "\toptions        SYSVSEM\n\n";
+}
+
+