add convenience method for ProgressPrintout (#1454)

Author: baltzell

common-tools/clas-utils/src/main/java/org/jlab/utils/benchmark/ProgressPrintout.java

@@ -37,8 +37,8 @@ public void setInterval(double interval){
 
     public String getUpdateString(){
         double totalElapsedTime = (this.previousPrintoutTime-this.startPrintoutTime)*1e-3;
-        StringBuilder str = new StringBuilder();
         double averageTime = 1000.0*totalElapsedTime/(this.numberOfCalls-WARMUP_CALLS);
+        StringBuilder str = new StringBuilder();
         str.append(String.format("%s (%12d) : ", this.printoutLeadingString,this.numberOfCalls-WARMUP_CALLS));
         str.append(String.format(" time : %8.2f (sec) =>>> average time = %9.3f msec", totalElapsedTime,averageTime));
         Set<String> keys = this.items.keySet();
@@ -47,6 +47,10 @@ public String getUpdateString(){
         }
         return str.toString();
     }
+
+    public double getHz() {
+        return ((double)(numberOfCalls-WARMUP_CALLS)) / (previousPrintoutTime-startPrintoutTime) * 1000;
+    }
 
     public void showStatus(){
         System.out.println("\n\n");