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java.io.IOException : can't allocate memory  RSS feed

 
vidya gandrakota
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When executing native code from java Runtime.exec() some times getting
can't allocate memory exception
java xmx memory s abt 60% of the total memory available

Can any one suggest whats wrong going on here
 
Jim Yingst
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Well, how much memory does the new process take, the one you're trying to exec()? And how much memory is available? If the new process is a big one, then you can get an error even though you seem to have free memory - if the amount of free memory is less than what the new process would require.

The amount of memory set by -Xmx probably isn't relevant here, as the new process will be outside the JVM. But that may depend on your operating system; I'm not sure.

It does seem very strange to get an IOException here though - an OutOfMemoryException would be more common. Can you show the stack trace?
 
vidya gandrakota
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Thanks for your response,

Following is the stack trace and more details abt that code that is causing problem.

java.io.IOException: java.io.IOException: Cannot allocate memory
at java.lang.UNIXProcess.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at com.x.y.z.invokeProcess(z.java :81)

What we do here is will invoke the runtime process to get execute a command and will read the results obtained from the Process,These results are read as follows.

BufferedReader bin = new BufferedReader(new InputStreamReader(tempProcess.getInputStream()));
String line = null;
String boutput="";
while ((line = bin.readLine()) != null) {
boutput+=line+"\n";
}

And then preparing the hash table with the boutput variable
This entire activity of executing command till preapring hash will repeatedly execute for any given random schedule say like 5 minutes


Thanks
Vidya G.
 
vidya gandrakota
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This out of memory error i seeing not very frequently it is coming
when my java application is consuming 60% of RAM and at that time if that scheduled process executes it is not able to execute that.
RAM size is 512MB out of that i allocated 60% of it to RAM to over come heap space problems.

Will there be any effect on OS free memory when java application is using 60% or 70% memmory utilization ??.

I am not sure of how java run time process uses the memory can you please explain if you have any idea.

Thanks
 
vidya gandrakota
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Hi when i invoke free command at the time of this exception is coming i am seeing free swap memory as 0 0 0

The exception is because of this reason ??
 
Ernest Friedman-Hill
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The error message is from your OS, and it just means that there isn't enough memory for the Java application and the other program you're trying to launch to be running at the same time. If you run your Java program up to that point and then try to launch the other program yourself, you will probably find that this won't work, either.,
 
vidya gandrakota
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Yes as my application running system is not having swap memory i am getting this problem.

Thank you.
 
Don't get me started about those stupid light bulbs.
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