Hi Sarel,
regarding the jvm settings you might want to look at
http://web.bvu.edu/staff/david/index.jsp?section=software&subsection=tcservcfg&page=overview
from http://jakarta.apache.org/tomcat/faq/windows.html. I havent tried the
utility myself but has modified the parameters in the Windows registry. To
do that add/change relevant paremeters in HKEY_LOCAL _MACHINE -> SYSTEM ->
CurrentControlSet --> Services -> Apache-Tomcat -> Parameters (using TC
4.1 though...)
The syntax in your case is then -Xms128m -Xmx1024m.
As yoy say DB connections cannot be reset I would make sure the used
connections are being returned to the connection pool or in case you are
not using a pool being closed properly - and then ASAP use connection
pooling instead.
Anyway I would till consider upgrade both the JVM and Tomcat.
Last I should note am not that Tomcat savy so perhaps some of the more
experienced folks in here would shed some light upon this issue...
Best regards Thomas
jerome moliere <[EMAIL PROTECTED]>
26-11-03 11:48
Besvar venligst til "Tomcat Users List"
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cc:
Vedr.: Re: TOMCAT 3.3 crash daily
Sarel Bester wrote:
>Hi all
>
>I have an app running on the following config:
>- Windows 2000 Advanced server (Dual PIII 1GHz CPU with 4GB RAM)
>- IIS 5
>- Tomcat 3.3 (NOT 3.3.x)
>- ISAPI redirector 1.2 (size = 128K)
>- JDK 1.3.1_09
>- Oracle 8.1.7
>
>Tomcat is locking up almost everyday. Log files show a lot of bad DB
>connections that cannot be reset. The app that I deployed gets connected
to
>by about 130 - 140 users at peak times (which doesn't really seem to be
that
>much.....).
>
>Some advice that I received (not in the Tocat user forum) is the
following :
>A) Confirm that TC uses "Server" version of JVM. (I presume this is the
>jvm.dll in the JAVA_HOME\JRE\BIN\SERVER folder?)
>I found the following line in the workers.properties :
>worker.inprocess.jvm_lib=$(workers.java_home)$(ps)jre$(ps)bin$(ps)classic$(p
>s)jvm.dll
>
>I changed it to :
>worker.inprocess.jvm_lib=$(workers.java_home)$(ps)jre$(ps)bin$(ps)server$(ps
>)jvm.dll
>
>Is this the correct place to make TC 3.3 use "Server" version of JVM?
>
>
>
oops, there's a more trivial way for getting the JVM use server option,
that is to say give the -server option to the java program while
invoking (see your scripts catalina.bat)
>B) Set memory parameters -Xms and - Xmx to allocate TC more memory.
>I am not sure where to do this . . .:-0
>
>I have seen in this forum previously that someone said it must be
specified
>in the "start parameters" in the General Tab screen of the Tomcat Service
>properties. Is it possible to specify these parameters in the
>wrapper.properties file (which seem to be used by the Tomcat service for
>startup)?
>
>What is the correct place to do this? Even registry perhaps . . . ?
>
>Is this exact syntax correct for the Windows OS? -Xms128 -Xmx1024
>
>
>
like for your first question this is not a directly related question
about tomcat but a question regarding howto setup/tune options to your
JVM....
java -help will give you any details...
>I am not very experienced in using Tomcat and is hesitant to Upgrade to,
say
>, 4.1x. But if you reckon it maybe a better alternative, I will
certainly
>consider.
>
>
I can't recommand you enough to look for JVM configurations tricks & to
ask about changing your JVM. I think that BEA Jrockit or latest JVM from
Sun could be good solutions...
Note that with BEA JVM the -option is deprecated , so leaving the
default parameter (jrockit) is a good choice
HTH
Jerome
--
Auteur cahier du programmeur Java tome 2 - Eyrolles 10/2003
http://www.eyrolles.com/php.informatique/Ouvrages/ouvrage.php3?ouv_ean13=9782212111941
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