Leon Rosenberg wrote:
Pid, Andre
thanx.
I will try both approaches.
I will try the MX Bean first, this just seems to be more elegant ;)
Typical Java thinking..
Sure, let's pull in another 15 classes..
Gotta use those GB of RAM for something..
Why do simple when complicated would do just as well, he ?
:-)
While you're at it, here is another variation of the original scheme, much more to my own
liking :
String[] cmd = { "/usr/bin/perl", "-e", "print getppid(),\"\\n\";" };
p = Runtime.getRuntime().exec(cmd);
Same defect as yours though, damn.
Or (from the same jguru post) :
String[] cmd = { "/bin/sh", "-c", "/bin/ps -f | /bin/awk '{print $2,$3}' | /bin/grep
\"^$$\" | /bin/awk '{print $2}'" };
p = Runtime.getRuntime().exec(cmd);
Now that one is not really elegant, but kind of .. macho ! 5 processes in a row, with
pipes. Woaw.
To get serious again, it /is/ funny that Java does not provide this simple
function.
And somehow I have a feeling that there may be a catch somewhere when dealing with threads
under various platforms.
I prefer Konstantin's first suggestion.
Now the question is : if Tomcat writes it's PID to that file, where does Tomcat
get it from ?
thank you
Leon
On Wed, Nov 17, 2010 at 10:50 PM, André Warnier <a...@ice-sa.com> wrote:
I found the following trick somewhere, maybe it works for you :
When starting your JVM, use a line like
java -Dpid=$$ program.java
and in the java program using the statement System.getProperty("pid");
If it works, it's cute, and certainly a lot less overhead.
Credits : http://www.jguru.com/faq/view.jsp?EID=416212
(last one)
Leon Rosenberg wrote:
Hi,
I have a ugly issue I'm sure many people on this list already solved.
For multiple purposes I need pid's of processes, to stop/start them or
ensure they are running. So far nothing spectacular.
To obtain the pid I have following util:
String[] cmd = { "/bin/bash", "-c", "echo $PPID" };
p = Runtime.getRuntime().exec(cmd);
and afterwards read the ppid from the output stream of my process. So
far - so good.
The problem now occurs if a process has a lot of memory configured.
Like 25Gb on a 32Gb machine. In such a configuration the above command
fails with an OS'es out of memory, because fork
fails to create another process with THAT amount of memory:
1598388 2010-11-17 02:54:47,061 ERROR net.anotheria.util.PidTools -
Could not determine PID: java.io.IOException: Cannot run program
"/bin/bash": java.io.IOException: error=12, Cannot allocate memory
Is there another method to obtain the process id from within the process?
regards
Leon
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