From 68aebed3a5063b97e685b1c70a2eac234e55ceb7 Mon Sep 17 00:00:00 2001
From: Arndt Brenschede <Arndt.Brenschede@web.de>
Date: Sun, 16 Dec 2018 13:35:17 +0100
Subject: [PATCH] stack sampling for RouteServer

---
 .../src/main/java/btools/server/RouteServer.java  | 15 +++++++++++++++
 .../src/main/java/btools/util/StackSampler.java   |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/brouter-server/src/main/java/btools/server/RouteServer.java b/brouter-server/src/main/java/btools/server/RouteServer.java
index fe3e249..28f8387 100644
--- a/brouter-server/src/main/java/btools/server/RouteServer.java
+++ b/brouter-server/src/main/java/btools/server/RouteServer.java
@@ -2,6 +2,7 @@ package btools.server;
 
 import java.io.BufferedReader;
 import java.io.BufferedWriter;
+import java.io.File;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
@@ -27,6 +28,7 @@ import btools.router.RoutingEngine;
 import btools.server.request.ProfileUploadHandler;
 import btools.server.request.RequestHandler;
 import btools.server.request.ServerHandler;
+import btools.util.StackSampler;
 
 public class RouteServer extends Thread
 {
@@ -239,6 +241,19 @@ public class RouteServer extends Thread
         TreeMap<Long,RouteServer> threadMap = new TreeMap<Long,RouteServer>();
 
         ServerSocket serverSocket = args.length > 5 ? new ServerSocket(Integer.parseInt(args[3]),50,InetAddress.getByName(args[5])) : new ServerSocket(Integer.parseInt(args[3]));
+
+        // stacksample for performance profiling
+        // ( caution: start stacksampler only after successfully creating the server socket
+        //   because that thread prevents the process from terminating, so the start-attempt
+        //   by the watchdog cron would create zombies )
+        File stackLog = new File( "stacks.txt" );
+        if ( stackLog.exists() )
+        {
+          StackSampler stackSampler = new StackSampler( stackLog, 1000 );
+          stackSampler.start();
+          System.out.println( "*** sampling stacks into stacks.txt *** ");
+        }
+
         long last_ts = 0;
         for (;;)
         {
diff --git a/brouter-util/src/main/java/btools/util/StackSampler.java b/brouter-util/src/main/java/btools/util/StackSampler.java
index 1c0f0b6..86e0f2e 100644
--- a/brouter-util/src/main/java/btools/util/StackSampler.java
+++ b/brouter-util/src/main/java/btools/util/StackSampler.java
@@ -117,7 +117,7 @@ public class StackSampler extends Thread
       {
         positiveMatch = true;
       }
-      if ( s.indexOf( "Thread.sleep" ) >= 0 )
+      if ( s.indexOf( "Thread.sleep" ) >= 0 || s.indexOf( "PlainSocketImpl.socketAccept" ) >= 0 )
       {
         return false;
       }