[icedtea-web-1.4] running sevrial plugins in parallel

[Jiri Vanek]

On 02/23/2014 01:56 PM, Efrat Lefeber wrote:
> I see there are all kind of FileLocks in the java side to synchronize between processes. For example in net/sourceforge/jnlp/util/lockingfile/LockedFile.java.
> Do you know why there is a need to synchronize between processes?

Yes. Those file should be accessed only by one process/thread per time.
I it is used only  for Extended Applets security. And there is important that only one  process 
write to it in time. And all others then pick up the fresh version. And act based on this action.

If you suspect this, you may try to disable extended applets security in itw-settings or in code , 
but i doubt a bit.


Thank you for digging into it!

J.
>
> -----Original Message-----
> From: Jiri Vanek [mailto:jvanek at redhat.com]
> Sent: Tuesday, February 18, 2014 10:36 AM
> To: Efrat Lefeber; distro-pkg-dev at openjdk.java.net
> Subject: Re: [icedtea-web-1.4] running sevrial plugins in parallel
>
> On 02/18/2014 09:28 AM, Efrat Lefeber wrote:
>> If you have several browsers running, each browser loads a different plugin instance which loads a different jvm instance.
>
> Ah, yes. Sorry I did not realize, but it is obvious. I would probably call it a bug:)
>
> TBH, this state was never examined nor profiled. Sorry:( but well it is not common :) )
>
> I will look onto it, but it will take time. Just for curiosity - what is an usecase?
>
> the workaround like "run just single browser" is probably unsuitable :)
>
> Sorry, funny morning here:)
>     As I told, I will try to look whats hidden in this usecase.
>      J.
>>
>> -----Original Message-----
>> From: Jiri Vanek [mailto:jvanek at redhat.com]
>> Sent: Tuesday, February 18, 2014 9:35 AM
>> To: Efrat Lefeber; distro-pkg-dev at openjdk.java.net
>> Subject: Re: [icedtea-web-1.4] running sevrial plugins in parallel
>>
>> On 02/17/2014 11:05 AM, Efrat Lefeber wrote:
>>> I am running several plugin processes in parallel (each runs its own jvm). No more than 5-6 in parallel.
>>
>> Hi!
>>
>> How have you manged it? All applets are supposed to run in single JVM.
>>>
>>> What I see a degradation in performance when there are more plugin processes running.
>>>
>>> Is there some kind of a lock between processes that could implement on the performance?
>>>
>>> Or any other idea why the performance gets worse when more plugin processes run in parallel?
>>>
>>>
>>
>> Regards,
>>       J.
>>
>>
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>
>
>
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