Hi, Virtual size is always constant - 12.6gb, no longer pauses in GC logs.
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VM will not fail if we run for loner time. We submit 400+ jobs(3-4 times per day) to thread pool of size 30, each thread has to execute more than 13+ jobs, initially threads starts sub process in milli seconds, some times after executing 6 or 7 jobs threads take more time to create a sub process, some times threads always take (For 13+ jobs) milli secs to create a sub process. Thanks & Regards, Manjunath From: <e...@zusammenkunft.net> Date: 16 Sep 2016 12:03 p.m. Subject: Re: Reg - Sub Process creation from java takes more time To: "Manjunath SV" <manju.j...@gmail.com>, "core-libs-dev@openjdk.java.net" <core-libs-dev@openjdk.java.net> Cc: Hello, Does the (virtual) size increase over time when it gets slower? How does the GC log looks like, any increasing activity or longer pauses? If you let this VM run for longer time (when it slows down), will it eventually fail because of some resource exhaustion? How often does the execute work fast, after what numberbof executions and what runtime it gets slower? You can also strace the process to see if the execution time of fork() and exec() syscalls increase. Gruss Bernd -- Von: Manjunath SV Gesendet: Freitag, 16. September 2016 08:19 An: core-libs-dev@openjdk.java.net Betreff: Reg - Sub Process creation from java takes more time Hi, I monitored memory usage, below are the details. Heap usage :- 857mb Virtual memory:- 12.6gb -Xmx set to 4gb. I have taken virtual and heap memory usage when Java spawns sub processes. Sub processes have short life, will be done in milli seconds. Thanks & Regards, Manjunath Date: Thu, 15 Sep 2016 11:01:01 +0200 From: <e...@zusammenkunft.net> To: "core-libs-dev@openjdk.java.net" <core-libs-dev@openjdk.java.net> Subject: Re: Reg - Sub Process creation from java takes more time Message-ID: <57da634c.c336c20a.19b0c.b...@mx.google.com> Content-Type: text/plain; charset="utf-8" Hello, Do you monitor heap usage and virtual memory size of your Java process? I would look out for increase (which causes slower for tines). Also it is generally a good idea to turn on GC logging and look into it if a java process degregades over time Gruss Bernd Just BTW: I think Java would not be the right tool to spawn and control sich a high number of external processes. Maybe it would be better to hand that off to a more native component. -- http://bernd.eckenfels.net Von: Manjunath SV Hi All, I am Manjunath, We are facing below issue in Java application. Issue Details :- Java application has a thread pool of size 30, When it receives Job message from JMS, It creates around 200+ jobs and submit into thread pool,initially 30 threads creates shell script process very quick, later process creation time gradually increases (5-9 mins). Java application invokes shell script, Below is the code. process = Runtime.getRuntime().exec(new String[] { script_name, param1, param2, param3,param4 }); int response = process.waitFor(); Shell script :- #!/bin/ksh linux-command -un $1 -pw $2 -f batch.txt < $3 > $4 2>&1 We redirected command output and errors to a file. First job execution after application restart takes just 15 sec, later job execution takes around 15 mins, some times 40 mins also. We are using java 1.8.0_92. Please advise on this. Thanks in advance. Regards, Manjunath
