I recently discovered jvisualvm and have been using it to profile
mkgmap. One thing I haven't discovered yet is how to profile an
application from the start - its trivial to attach to an already
running java app using the gui but if it's already running, you could
miss some useful info. So, the attached patch is a little kludge that
lets you start mkgmap but then it immediately pauses for a little while
(long enough to attach jvisualvm to it and turn on the profiling, etc.)
before it gets down to work.
To use this, just add -Dsleep-on-startup=30 or similar to your Java
args.
Can anyone think of a better way of achieving the same goal?
Mark
diff --git a/src/uk/me/parabola/mkgmap/main/Main.java b/src/uk/me/parabola/mkgmap/main/Main.java
index 8e9a389..a304c46 100644
--- a/src/uk/me/parabola/mkgmap/main/Main.java
+++ b/src/uk/me/parabola/mkgmap/main/Main.java
@@ -88,6 +88,18 @@ public class Main implements ArgumentProcessor {
*/
public static void main(String[] args) {
+ try {
+ int delayPeriod = Integer.decode(System.getProperty("sleep-on-startup", "0"));
+ if(delayPeriod > 0) {
+ System.err.println("Sleeping for " + delayPeriod + " seconds...");
+ Thread.sleep(delayPeriod * 1000);
+ System.err.println("Wake up, time for work!");
+ }
+ }
+ catch(Exception e) {
+ // relax
+ }
+
// Temporary test for version 1.6. During a transition period we are
// compiling with target 1.5 so that it will run with 1.5 long enough
// to give an error message.
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