php-java-bridge-users

[Php-java-bridge-users] Memory problems on big size params

[<php...@li...>]

Hi!! My name is Davide and is my first message on the llist.

I'v created a class who make something on a large bytearray stream.
After a series of call of the metod "test" the javabridge send
OutOfMemory errors.

The problem seem that the system don't free the allocated memory.

I try also with a singleton class but the problem persist.

There are known problem related to passing big size params??

with a memory set to 384M (-Xmx384m) the javabridge fill the memory
after 3/4 calls.

PHP
$data = function_that_return_a_50Mega_byteArray();
java_require(CLASSPATH);
$fooClass = new Java("Foo");
$retData = java_values($fooClass->test($data));


JAVA
class Foo {
  public Foo() {
  }

  public  byte[] test(byte[] inputByteArray)  {
         return inputByteArray;
  }
}


I've tried this code too, whith the method "test" that simply return the
array;

Thanks
Davide Fiorello

Re: [Php-java-bridge-users] Memory problems on big size params

[<php...@li...>]

Hi Davide,

> After a series of call of the metod "test" the
> javabridge send
> OutOfMemory errors.

I could not reproduce this problem. I've created a
class which passes a 100MB byte array to java,
retrieves it and compares the result. The algorithm
requires at least 500MB heap, but there's no memory
leak.


> The problem seem that the system don't free the
> allocated memory.

Can you please open a problem report (please use
http://sourceforge.net/tracker/?func=add&group_id=117793&atid=679233)
and attach the code to reproduce this memory leak at
the end of the ticket?


> I try also with a singleton class but the problem
> persist.

Well, if you bind your data to a class, the data will
not be released until the VM runs out of memory. This
isn't a bug but a Java feature.

> There are known problem related to passing big size
> params??

No. But note that sending large binary data is not as
efficient as you might think. XML is a ASCII protocol,
to that your byte array is 4/3 times bigger than it
needs to be. 

> $data = function_that_return_a_50Mega_byteArray();
> with a memory set to 384M (-Xmx384m) the javabridge
> fill the memory
> after 3/4 calls.

50MB for the original data, +67MB+50MB (arg) +50MB
(result) + 67MB (response) = 284MB. So 384 MB heap
should be enough.


Regards,
Jost Boekemeier



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