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From takanobu watanabe <rreedd...@gmail.com>
Subject Re: What is default value of CATALINA_OPTS at apache-tomcat-6.0.29?
Date Thu, 02 Sep 2010 05:12:51 GMT
Hello Rainer,

Thanks detailed explain.
and now I use jconsole to measuring.
But when jconsole try to connect remote target host, JVM down.
Probably it is not tomcat issue,I think.
I may close this issue.
Regard,

--catalina.out--
...
#
# An unexpected error has been detected by Java Runtime Environment:
#
#  Internal Error (os_linux_zero.cpp:157), pid=1696, tid=1735849104
#  Error: caught unhandled signal 11
#
# Java VM: OpenJDK Core VM (1.6.0_0-b11 interpreted mode linux-arm)
# An error report file with more information is saved as:
# /root/hs_err_pid1696.log
#
# If you would like to submit a bug report, please visit:
#   http://icedtea.classpath.org/bugzilla
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
---

On 31 August 2010 20:57, Rainer Jung <rainer.jung@kippdata.de> wrote:
> On 31.08.2010 13:14, takanobu watanabe wrote:
>>
>> Thank you very much Rainer.
>>
>>> Tomcat itself doesn't need much memory and you should be able to run it
>>> with less than 64MB Heap (plus Perm)
>>
>> I recognized 64MB>=  Am +  Bm from your advice.
>> Is my recognized correct ?
>> ---example catalina.sh---
>> -XX:NewSize=Am -XX:MaxNewSize=Am
>>  -XX:PermSize=Bm -XX:MaxPermSize=Bm"
>
> I don't actually understand the question, but here's the terminology (I hope
> the picture isn't disturbed by line breaks):
>
> <---------------------- Heap -------------------><- Perm ->
> <----------------- New ----------------><- Old ->
> <- Eden -><- Survivor1 -><- Survivor2 ->
>
> Sometimes New is also defined as Eden plus one of the two survivors,
> especially in the verbose GC output.
>
> The two survivors are also called "From Space" and "To Space", the roles
> change during each GC run in New.
>
> Xms, Xmx: minimum and maximum heap size
> XX:NewSize, XX:MaxNewSize: minimum and maximum size of New
> XX:PermSize and XX:MaxPermSize: minimum and maximum size of Perm
>
> Sizes of Survivor spaces (each one) are determined by
>
> Size of Survivor = Size of New / (SurvivorRatio + 2)
>
> So if SurvivorRatio is some number N, then the Ratios are
>
> Eden:Survivor1:Survivor2 = N:1:1
>
> and New = (N+2) * One Survivor
>
> Regards,
>
> Rainer
>
>> On 31 August 2010 19:00, Rainer Jung<rainer.jung@kippdata.de>  wrote:
>>>
>>> On 31.08.2010 10:34, takanobu watanabe wrote:
>>>>
>>>> Hello,
>>>>
>>>> What is default value of CATALINA_OPTS at apache-tomcat-6.0.29 ?
>>>> It means No configure catalina.sh as same as value of CATALINA_OPTS
>>>> just expand tomcat.
>>>>
>>>> Because I try to run tomcat lean physical memory condition(128Mb only
>>>> with armv5).
>>>> When nothing configure to catalina.sh(default),Tomcat works well.
>>>> But when I configure below,looks like always FullGC running and could
>>>> not access WEB service.
>>>> ---
>>>> CATALINA_OPTS=" -verbose:gc -XX:+PrintGCTimeStamps -Xms64m -Xmx64m
>>>> -XX:NewSize=32m -XX:MaxNewSize=32m
>>>> -XX:SurvivorRatio=2 -XX:PermSize=16m -XX:MaxPermSize=16m"
>>>> ---
>>>> If anyone has idea or suggest of run tomcat on lean physical memory
>>>> condition, I would like to know.
>>>
>>> If you don't add explicit memory options, the default memory sizes of
>>> your
>>> JVM are used. Those might depend on the exact jvm version and also on the
>>> type of system you run it on (total memory, CPUs).
>>>
>>> The easiest way to find out the sizes for your jvm are running it without
>>> explicit settings and then measuring it. Measuring can be done with tools
>>> like jstat, jconsole or jvisualvm, or you can add a few verbose gc flags
>>> to
>>> print out the sizes of the different memory regions during each run of
>>> the
>>> GC, e.g.
>>>
>>> -verbose:gc -XX:+PrintGCDetails -XX:+PrintHeapAtGC -XX:+PrintGCTimeStamps
>>>
>>> Note that the default settings will allow some of the regions to grow and
>>> shrink, so you need to make observations for a longer time to find out
>>> the
>>> values which are effective most of the time.
>>>
>>> I expect your above settings might not leave enough room in the Old
>>> Generation (aka Tenured), because your New Generation is somwhat large
>>> relative to the Old Gen. Tomcat itself doesn't need much memory and you
>>> should be able to run it with less than 64MB Heap (plus Perm), but what
>>> you
>>> need in the end depends on the application inside (and the concurrency
>>> induced by the load). I never experimented to find a minimum value
>>> though.
>>>
>>> Regards,
>>>
>>> Rainer
>
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