Index: branches/eam_branches/ipp-20211108/ppStack/src/ppStackCombinePercent.c
===================================================================
--- branches/eam_branches/ipp-20211108/ppStack/src/ppStackCombinePercent.c	(revision 41927)
+++ branches/eam_branches/ipp-20211108/ppStack/src/ppStackCombinePercent.c	(revision 41928)
@@ -1,4 +1,5 @@
 #include "ppStack.h"
 
+# define USE_THREADS 1
 // #define TESTING
 
@@ -29,10 +30,15 @@
         psArrayAdd(job->args, 1, options);
         psArrayAdd(job->args, 1, config);
-        if (!psThreadJobAddPending(job)) {
-            return false;
-        }
+
+	if (USE_THREADS) {
+	    if (!psThreadJobAddPending(job)) {
+		return false;
+	    }
+	} else {
+	    ppStackReadoutPercentThread(job);
+	}
     }
-
-    if (!psThreadPoolWait(true, true)) {
+    
+    if (USE_THREADS && !psThreadPoolWait(true, true)) {
         psError(psErrorCodeLast(), false, "Unable to do initial combination.");
         return false;