--- Run.comprehensive	2010-03-30 23:05:20.000000000 -0400
+++ Run.comprehensive	2010-04-12 11:00:00.000000000 -0400
@@ -8,6 +8,14 @@
   if( ! $?TESTptraj ) set TESTptraj = "../../exe/ptraj"
 else
   if( ! $?TESTptraj ) set TESTptraj = "../../exe/ptraj.MPI"
+  set numprocs=`echo $DO_PARALLEL | awk -f ../numprocs.awk `
+  if ( $numprocs != 2 && $numprocs != 4 ) then
+    echo " Trying to run test with $numprocs threads."
+    echo " The parallel version of this test case requires either 2 or 4 threads."
+    echo " Not running test, exiting....."
+    echo ""
+    exit(0)
+  endif
 endif
 
 $DO_PARALLEL $TESTptraj compound.prmtop ptraj.in >&  ptraj.out || goto error