Re: [Wrapper-user] Jar works with console, throws exceptions when launched via start?

[Leif M. <le...@ta...>]

Stas,
Currently, the Wrapper is not doing anything special with the process
priorities.  It appears that the OS launches all "top-level" processes
at the same level.  Ie the Wrapper, or Java when run standalone.  Then
child processes are given a lower priority.  When Java is run under
the Wrapper, this means that it is getting a slightly lower priority
than it would if it was run standalone.

We are looking into options to work around this.

Cheers,
Leif

On Mon, Oct 6, 2008 at 4:00 AM, Stas Oskin <sta...@gm...> wrote:
> Hi Lee.
>
> You mean that the wrapper actually gets a higher priority then the JVM it
> launches?
>
> Regards.
>
> 2008/10/5 Leif Mortenson <le...@ta...>
>>
>> Stas,
>> I was able to to check the default priorities using the following command:
>> ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm
>>
>> On Ubuntu, the Wrapper is defaulting to a nice level of 0 and a
>> real-time priority of 24, but the JVM is set to a nice level of 0 and
>> a real-time priority of 19.
>> According to the nice manual however, the range of possible values is
>> -20 (most favorable) to 19 (least favorable)
>>
>> If I set the PRIORITY in the script to 5 then the nice levels both get
>> set to 5, but the real-time priorities are 19 and 15 respectively.
>> This is actually lower priority.
>> Setting priorities to a value higher than 0 requires root privilege.
>>
>> If do so and set it to -5, then the nice levels are both -5, and the
>> real-time priorities are 29 and 26 respectively.
>>
>> So quick answer, the default is 0.   I need to look into the real-time
>> priority more on my end.   you are probable seeing the lower priority
>> do to this difference in real-time priorities between the top level
>> wrapper process and its child java process.  I had not noticed this
>> before.
>>
>> Cheers,
>> Leif
>>
>> On Wed, Oct 1, 2008 at 11:30 PM, Stas Oskin <sta...@gm...> wrote:
>> > Hi Leif.
>> >
>> > Thanks, I see.
>> >
>> > Do you have any idea how to find current priority level (so I could
>> > increase
>> > 1 by 1).
>> >
>> > Regards.
>> >
>> > 2008/10/1 Leif Mortenson <le...@ta...>
>> >>
>> >> Stas,
>> >> On linux, open your wrapper shell script in an editor and modify the
>> >> PRIORITY value found in the settings section towards the top.  These
>> >> are standard nice levels, so look at "man nice" for details.
>> >>
>> >> Cheers,
>> >> Leif
>> >>
>> >> On Wed, Oct 1, 2008 at 9:44 PM, Stas Oskin <sta...@gm...>
>> >> wrote:
>> >> > Hi Leif.
>> >> >
>> >> > 2008/10/1 Leif Mortenson <le...@ta...>
>> >> >>
>> >> >> Stas,
>> >> >> That's great news.   The memory leaks were in the Java code?  What
>> >> >> are
>> >> >> you maximum memory settings set to?  Are they low enough that the
>> >> >> entire JVM will fit in memory without any swapping along side the OS
>> >> >> and other apps being used?  Java performs very poorly when its
>> >> >> memory
>> >> >> is being swapped out. (Not a Wrapper issue)
>> >> >
>> >> > The leaks were in JNI code and quickly took the whole memory. This
>> >> > caused
>> >> > Java to swap.
>> >> >
>> >> >>
>> >> >> About the CPU, I reread this thread but I don't think you ever told
>> >> >> me
>> >> >> what platform you are running on.  That will make a big difference.
>> >> >> Under UNIX, there is a setting in the shell script which allows you
>> >> >> to
>> >> >> specify a "nice" level to control the priority.
>> >> >
>> >> > We use Linux - CentOS distro. What setting we should look to?
>> >> >
>> >> >>
>> >> >> On Windows, it is done using the
>> >> >> wrapper.ntservice.process_priority=NORMAL property.  Please be sure
>> >> >> to
>> >> >> read the warnings in the documentation.
>> >> >>
>> >> >>
>> >> >>
>> >> >> http://wrapper.tanukisoftware.org/doc/english/prop-ntservice-process-priority.html
>> >> >>
>> >> >> Normally on most platforms, the OS gives priority to the Windowing
>> >> >> system and those processes to make them more responsive.  That is
>> >> >> why
>> >> >> on UNIX, it is good to run servers in a headless environment.
>> >> >
>> >> > Hmm, we running the server without any X installed, strictly via
>> >> > console
>> >> > -
>> >> > is this what you call headless?
>> >> >
>> >> > Actually, this is the main app the server was targeted to, so we
>> >> > indeed
>> >> > prefer to give it all the priority we can (without hanging the OS of
>> >> > course).
>> >> >
>> >> > Regards.
>> >> >
>> >> >
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