! show-busy-java-threads: improve extract block logic of awk

oldratlee · Mar 31, 2021 · d8df80f · d8df80f
1 parent 2775555
commit d8df80f
Showing 1 changed file with 7 additions and 10 deletions.
diff --git a/bin/show-busy-java-threads b/bin/show-busy-java-threads
@@ -366,16 +366,13 @@ __top_threadId_cpu() {
     fi
 
     echo "$top_out" |
-        awk 'BEGIN { blockIndex = 0; currentLineHasText = 0; prevLineHasText = 0; } {
-            currentLineHasText = ($0 != "")
-            if (prevLineHasText && !currentLineHasText)
-                blockIndex++    # from text line to empty line, increase block index
-
-            if (blockIndex == 3 && ($NF == "java" || $NF == "jsvc"))   # $NF(last field) is command field
-                # only print 4th text block(blockIndex == 3), aka. process info of second top update
-                print $1 " " $9     # $1 is thread id field, $9 is %cpu field
-
-            prevLineHasText = currentLineHasText    # update prevLineHasText
+        awk '{
+            # from text line to empty line, increase block index
+            if (previousLine && !$0) blockIndex++
+            # only print 4th text block(blockIndex == 3), aka. process info of second top update
+            if (blockIndex == 3 && ($NF == "java" || $NF == "jsvc"))  # $NF(last field) is command field
+                print $1, $9  # $1 is thread id field, $9 is %cpu field
+            previousLine = $0
         }' | sort -k2,2nr
 }