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From Leon Rosenberg <rosenberg.l...@gmail.com>
Subject Re: [OT] How to obtain the id of the current process
Date Wed, 17 Nov 2010 21:52:52 GMT
Pid, Andre
thanx.
I will try both approaches.
I will try the MX Bean first, this just seems to be more elegant ;)

thank you
Leon

On Wed, Nov 17, 2010 at 10:50 PM, André Warnier <aw@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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>
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