| #!/bin/bash |
| # |
| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| # |
| |
| # displays a jstack thread dump showing only "really-running" threads |
| # |
| # takes a PID as argument |
| # filters jstack to remove wait/blocked threads and known |
| # wait points which report themselves as active (e.g. socket.read) |
| # |
| # very useful for spot-checking what is *actually* consuming CPU |
| |
| |
| jstack $@ | awk ' |
| function onTraceBegin() { |
| onTraceEnd() |
| data["lineCount"]=0 |
| data["head"]=$0 |
| } |
| |
| function onTraceEnd() { |
| if ("head" in data) { |
| if (data["active"] && "topClass" in data) { |
| print data["head"] |
| for (l=1; l<=data["lineCount"]; l++) { print lines[l] } |
| print "" |
| } |
| } |
| delete lines |
| delete data |
| } |
| |
| function startsWith(whole,prefix) { |
| return (substr(whole,1,length(prefix))==prefix); |
| } |
| |
| { |
| if (!match($0,"[^\\s]")) onTraceEnd(); |
| else if (substr($0,1,1)=="\"") onTraceBegin(); |
| else if ("head" in data) { |
| lc = ++data["lineCount"]; |
| lines[lc]=$0 |
| if (lc==1) { |
| state=data["state"]=$2; |
| data["active"] = !(state=="WAITING" || state=="BLOCKED" || state=="TIMED_WAITING") |
| } |
| if ($1=="at") { |
| if ("topClass" in data) { |
| } else { |
| data["topClass"] = $0; |
| tc = $2; |
| if (data["active"]) { |
| if (startsWith(tc,"java.net") || startsWith(tc,"sun.nio")) data["active"]=false; |
| } |
| } |
| } |
| } |
| } |
| END { |
| onTraceEnd(); |
| } |
| ' |