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Question regarding Tomcat memory
by Harish S Rathod
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Hi,
To make our tomcat heap size memory to 8 GB we have set the below=20 settings echo $CATALINA_OPTS -Xms8192M -Xmx8192M -Xss1024K=20 -XX:PermSize=3D64m -XX:MaxPermSize=3D256m -Dfile.encoding=3DCp1252 Please=20 suggest is this ok ? as we are observing the maximum heap size memory for=20 tomcat gets a reduced bit to around 7756736K and it keeps flucatating. Is= =20 this the normal behaviour?. The OS we are using is Linux 8. |
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RE: Question regarding Tomcat memory
by Caldarale, Charles R
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> From: Harish S Rathod [mailto:harishjss2002@...]
> Subject: Question regarding Tomcat memory First, use a different mailer or send only in plain text; whatever you're using is encoding even standard ASCII characters like "=". > To make our tomcat heap size memory to 8 GB we have set the below=20 How much RAM and swap space do you have on the system? What JVM are you using? To go over 1.8 GB you need a 64-bit JVM. > $CATALINA_OPTS -Xms8192M -Xmx8192M -Xss1024K=20 Setting -Xss is usually not useful, unless your application is very, very strange. > as we are observing the maximum heap size memory for > tomcat gets a reduced bit to around 7756736K and it > keeps flucatating. What are you using to do the "observing"? When I run JConsole targeting a JVM with the exact settings you specify, it says this about the heap: Committed: 8,039,104 kbytes Max: 8,039,104 kbytes This is on a SuSE 10 system, with JDK 1.6.0_07, in server mode. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. --------------------------------------------------------------------- To start a new topic, e-mail: users@... To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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Re: Question regarding Tomcat memory
by Harish S Rathod
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Hi,
Sorry the content of the mail was bit messed up ,i have corrected the settings wordings please read the below text To make our tomcat heap size memory to 8 GB we have set the below settings -Xms8192M -Xmx8192M -Xss1024K -XX:PermSize=64m -XX:MaxPermSize=256m -Dfile.encoding=Cp1252 Please suggest is this ok ? as we are observing the maximum heap size memory for tomcat gets a reduced bit to around 7756736K and it keeps flucatating.Is this normal behaviour The OS we are using is Linux 8. - Well we are using 64 bit JDK - We are prinitng the heap mem using Log 4J utitiy in the apllication logs. On Sat, Nov 15, 2008 at 4:01 AM, Caldarale, Charles R < Chuck.Caldarale@...> wrote: > > From: Harish S Rathod [mailto:harishjss2002@...] > > Subject: Question regarding Tomcat memory > > First, use a different mailer or send only in plain text; whatever you're > using is encoding even standard ASCII characters like "=". > > > To make our tomcat heap size memory to 8 GB we have set the below=20 > > How much RAM and swap space do you have on the system? What JVM are you > using? To go over 1.8 GB you need a 64-bit JVM. > > > $CATALINA_OPTS -Xms8192M -Xmx8192M -Xss1024K=20 > > Setting -Xss is usually not useful, unless your application is very, very > strange. > > > as we are observing the maximum heap size memory for > > tomcat gets a reduced bit to around 7756736K and it > > keeps flucatating. > > What are you using to do the "observing"? When I run JConsole targeting a > JVM with the exact settings you specify, it says this about the heap: > > Committed: 8,039,104 kbytes > Max: 8,039,104 kbytes > > This is on a SuSE 10 system, with JDK 1.6.0_07, in server mode. > > - Chuck > > > THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY > MATERIAL and is thus for use only by the intended recipient. If you received > this in error, please contact the sender and delete the e-mail and its > attachments from all computers. > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@... > To unsubscribe, e-mail: users-unsubscribe@... > For additional commands, e-mail: users-help@... > > |
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RE: Question regarding Tomcat memory
by Caldarale, Charles R
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> From: Harish S Rathod [mailto:harishjss2002@...]
> Subject: Re: Question regarding Tomcat memory > > -Xms8192M -Xmx8192M -Xss1024K -XX:PermSize=64m -XX:MaxPermSize=256m > -Dfile.encoding=Cp1252 That's what I surmised. > Please suggest is this ok ? As long as you have the RAM to hold that much heap (plus the other memory required by the process), it should be o.k. If you don't have at least 9 GB of RAM, you're going to be paging like mad, which will absolutely kill performance. Again, setting -Xss is usually pointless. I would set PermSize to the same value as MaxPermSize, just to avoid unnecessary expansion and contraction of the PermGen. > - Well we are using 64 bit JDK Which one? > - We are prinitng the heap mem using Log 4J utitiy in the > apllication logs. I don't know how log4j determines that value; what is shown by JConsole or LambdaProbe? (The latter can be found at www.lambdaprobe.org.) - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. --------------------------------------------------------------------- To start a new topic, e-mail: users@... To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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Re: Question regarding Tomcat memory
by Christopher Schultz-2
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1 Chuck, Caldarale, Charles R wrote: > I don't know how log4j determines that value AFAIK, Log4j doesn't have any memory-specific memory info logging. The user has to do it themselves. I suspect they are simply using System.getRuntime() and then printing values from there. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkkhgEQACgkQ9CaO5/Lv0PCIJACeMoYWMSQ+Za157tZlTkVoyUVn yc0AniHr3pwj4u9wsYwdktJ5D5zO+r6G =u+oy -----END PGP SIGNATURE----- --------------------------------------------------------------------- To start a new topic, e-mail: users@... To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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RE: Question regarding Tomcat memory
by Caldarale, Charles R
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> From: Rainer Frey (Inxmail GmbH) [mailto:frey@...]
> Subject: Re: Question regarding Tomcat memory > > AFAIK the default stack size of the JVM on 64bit linux is 2M. No, it's 1M for Linux (and Solaris) on AMD64 (at least on JDK 6u7) - the same as the OP was trying to set. For Linux IA64 and Windows AMD64, the system default is used. > Setting Xss to a lower value reduces memory footprint of > a single thread, and thus allows for more threads and/or > larger heap with same amount of physical memory. While true in theory, it's all virtual space, not RAM, so there's no additional contention for pages of physical memory. The size of the process space in 64-bit Linux is so huge that you run into the kernel's limit on the number of threads long before the stack size has any impact on the available process space. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. --------------------------------------------------------------------- To start a new topic, e-mail: users@... To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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