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

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Thanks for the update, Leif.

Stas.

2008/10/14 Leif Mortenson <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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