Hi,
good to hear, that the problem is understood and worked on ;)
Since you guys know what the problem is, is there a way to prevent this
to happen on jdk7 before u40?
bye Jochen
Am 30.09.2013 16:48, schrieb Coleen Phillimore:
>
> Hi, Stefan has found the cause of the problem you have described this
> thread, but we're discussing internally how to fix it. I'll let him
> explain.
>
> Thanks,
> Coleen
>
> On 09/26/2013 10:20 AM, Jochen Theodorou wrote:
>> Hi all,
>>
>> probably not such a good time to ask, since many of those, that could
>> answer this might be on JavaOne... but still
>>
>> On the user list we got an interesting program that makes quite some
>> problems to the jvm as it seems. The groovy program looks like this:
>>
>>> println "Started"
>>> for(int i = 0; i < 100; i++) {
>>> print "."
>>> for (int j=0;j<100000;j++) {
>>> Container c = new Container()
>>> c.run()
>>> }
>>> }
>>> println "\ndone"
>>>
>>> public class Container implements Runnable {
>>> public Container() {}
>>> public void run() {
>>> GroovyShell gs = new GroovyShell()
>>> Script script = gs.parse("")
>>> script.run()
>>> }
>>> }
>> What happens is that gs.parse will create a new script and a new class
>> every time. Now using our custom call site code this works fine. Using
>> the indy port, it fails with a permgen error on any jdk7 before u40. On
>> u40 this works fine again. In jdk8 this fails sometimes with a metaspace
>> error, while in u40 it seems to work quite reliable.
>>
>> The problem must be more than just creating many classes, because our
>> custom callsite caching creates just as many classes for the scripts as
>> the indy version does. What does not happen so much there though is code
>> generated by reflection and of course non from indy. So I especially
>> suspect the code cache here to be responsible for the problem, but I
>> have no real basis for this. I lack the means to diagnose the problem
>> further
>>
>> Is there a way to make this work on older jdk7 vms? And is there a way
>> for me to make this work on jdk8? Do others here have similar experiences?
>>
>> bye Jochen
>
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--
Jochen "blackdrag" Theodorou - Groovy Project Tech Lead
blog: http://blackdragsview.blogspot.com/
german groovy discussion newsgroup: de.comp.lang.misc
For Groovy programming sources visit http://groovy-lang.org
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