You have to balance that against the minimal cost of today's
memory (even ECC RAM is under $10 per GiB).
True, RAM is relatively cheap, but servers are not. We like to stack as
many instances of tomcat on a server as possible while maintaining good
performance. Some of our 8-core 32GB
the
max memory they were requesting while also ensuring that the
instance did not use more memory than it really needed. It seemed
like a win-win. However, they were not happy. They insisted that we
set the minimum to 512M as well.
That sounds a little foolish. The only reason to set Xms=Xmx
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: Free Memory vs. Total Memory vs. Max Memory
I'll have to do some more reading about the JVM returning memory
to the OS after the heap shrinks: if the JVM does not return the
memory, then your most-recent peak
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Chuck,
On 2/21/12 1:06 PM, Caldarale, Charles R wrote:
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: Free Memory vs. Total Memory vs. Max Memory
I'll have to do some more reading about the JVM returning memory
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Subject: Re: Free Memory vs. Total Memory vs. Max Memory
Okay, so it sounds like if the environment is such that reducing the
heap at intervals is important (many JVMs, peak-memory-load events are
rare, etc.) then using Xms
On 17/02/2012 04:58, Robinson, Eric wrote:
What are the possible downsides of setting a low initial memory pool and
a high max pool? If a tomcat app usually needs approximately 64MB of
heap space, but sometimes as much as 300-400MB, would it cause any
problems to set the initial pool to 16M
What are the possible downsides of setting a low initial
memory pool
and a high max pool? If a tomcat app usually needs
approximately 64MB
of heap space, but sometimes as much as 300-400MB, would it
cause any
problems to set the initial pool to 16M and the max pool to 512M?
An
From: Robinson, Eric [mailto:eric.robin...@psmnv.com]
Subject: RE: Free Memory vs. Total Memory vs. Max Memory
If what you described occurs, we would see OOMs in the
logs, correct?
Only rarely. More typical is slow response and annoyed end users.
Also, if the machine has inadequate RAM
Robinson, Eric wrote:
We have many servers that have been running 100-200 instances
of tomcat each for years without any performance problems.
Most of our servers are Linux 8-core machines with 32GB RAM,
with the tomcat instances configured with -Xms16M -Xmx192M.
We also have some Windows
Robinson, Eric wrote:
We have many servers that have been running 100-200 instances of
tomcat each for years without any performance problems.
Most of our servers are Linux 8-core machines with 32GB
RAM, with the
tomcat instances configured with -Xms16M -Xmx192M.
We also have some
Robinson, Eric eric.robin...@psmnv.com wrote:
Agreed. Anyway, in this case the thread is on a tomcat server that is
only used for scheduled java tasks. Users do not access it directly.
Very puzzling. What's I'd really like is for some well-known tomcat
guru
to say that in our environment, -Xms16M
On 18/02/2012 14:44, Mark Thomas wrote:
Robinson, Eric eric.robin...@psmnv.com wrote:
Agreed. Anyway, in this case the thread is on a tomcat server that
is only used for scheduled java tasks. Users do not access it
directly. Very puzzling. What's I'd really like is for some
well-known
Robinson, Eric wrote:
What are the possible downsides of setting a low initial memory pool and
a high max pool? If a tomcat app usually needs approximately 64MB of
heap space, but sometimes as much as 300-400MB, would it cause any
problems to set the initial pool to 16M and the max pool to 512M?
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Hash: SHA1
Eric,
On 2/17/12 3:28 AM, André Warnier wrote:
Robinson, Eric wrote:
What are the possible downsides of setting a low initial memory
pool and a high max pool? If a tomcat app usually needs
approximately 64MB of heap space, but sometimes as much
If your application
needs 64MB of
Heap space and you allocate only -Xms16M, then right at the
start the
JVM will have to increase the Heap to 64MB (minimum); so
why would you
do that ?
64MB was just a number I threw out. The app actually uses about 20MB at
startup, so we might
Note that you are talking of memory pool, which is a bit
vague. The -Xms and -Xmx parameters relate to how big the
Heap is, which is only one part of the memory space needed by the JVM.
I am just using the terms that I see on the screen when I pull up
tomcat6w.exe.
--Eric
Disclaimer
Robinson, Eric wrote:
Note that you are talking of memory pool, which is a bit
vague. The -Xms and -Xmx parameters relate to how big the
Heap is, which is only one part of the memory space needed by the JVM.
I am just using the terms that I see on the screen when I pull up
tomcat6w.exe.
Robinson, Eric wrote:
If your application
needs 64MB of
Heap space and you allocate only -Xms16M, then right at the
start the
JVM will have to increase the Heap to 64MB (minimum); so
why would you
do that ?
64MB was just a number I threw out. The app actually uses about 20MB at
startup,
happy, so I set it to -Xms16M
-Xmx512M because I felt that this would give them the max memory they
were requesting while also ensuring that the instance did not use more
memory than it really needed. It seemed like a win-win. However, they
were not happy. They insisted that we set the minimum to 512M
We have many servers that have been running 100-200 instances
of tomcat each for years without any performance problems.
Most of our servers are Linux 8-core machines with 32GB RAM,
with the tomcat instances configured with -Xms16M -Xmx192M.
We also have some Windows servers with 100-150
What are the possible downsides of setting a low initial memory pool and
a high max pool? If a tomcat app usually needs approximately 64MB of
heap space, but sometimes as much as 300-400MB, would it cause any
problems to set the initial pool to 16M and the max pool to 512M?
--
Eric
Hello,
How Can I adjust the maximum memory usage for Tomcat process?
Greetings
Alexander Diedler
From: Alexander Diedler [mailto:[EMAIL PROTECTED]
Subject: Adjust max memory usage in Tomcat
How Can I adjust the maximum memory usage for Tomcat process?
1) Learn how to use Java.
2) Read the Tomcat FAQ.
http://wiki.apache.org/tomcat/FAQ/Memory
3) Search the archives.
http://marc.info/?l
Hi all,
I was using Tomcat 4.1.24 as windows services. To set the max heap memory
for the JVM we can modify the registry setting using 'regedit.
In the registry we can add JVM Option to add something like -Xmx512m to
set the JVM max memory to 512MB.
In Tomcat 4.1.37 registry I couldn't find
the Max
memory setting of 2GB.
I did find an entry from the archives (see below), if I am understanding
Chuck's reply (from entry below) there should be a 2GB limit not a 1GB limit
correct? On my test box, which has 2GB of memory, I was able to enter
1500 under the max memory pool and Tomcat
From: Indu Devanath [mailto:[EMAIL PROTECTED]
Subject: Increasing Max Memory in Tomcat resulting in failed
startup of Tomcat
if I am understanding Chuck's reply (from entry below)
there should be a 2GB limit not a 1GB limit correct?
There's a 2GB virtual space limit for the entire
status page shows the following...
Free memory: 158.53 MB Total memory: 373.75 MB Max memory: 913.37 MB
That max memory figure in particular looks like a pretty strange
default! I thought the default was 64m.
The installation details are as follows...
Apache Tomcat/5.5.16 1.5.0_06-b05 Sun
the perm gen size and review the
JAVA_OPTS settings in general when I noticed something curious. No
settings are currently made so its just running with default values, but
the manager status page shows the following...
Free memory: 158.53 MB Total memory: 373.75 MB Max memory: 913.37 MB
That max
so its just running with default values, but
the manager status page shows the following...
Free memory: 158.53 MB Total memory: 373.75 MB Max memory: 913.37 MB
That max memory figure in particular looks like a pretty strange
default! I thought the default was 64m.
The installation
the
JAVA_OPTS settings in general when I noticed something curious. No
settings are currently made so its just running with default values, but
the manager status page shows the following...
Free memory: 158.53 MB Total memory: 373.75 MB Max memory: 913.37 MB
That max memory figure
are currently made so its just running with default values, but
the manager status page shows the following...
Free memory: 158.53 MB Total memory: 373.75 MB Max memory: 913.37 MB
That max memory figure in particular looks like a pretty strange
default! I thought the default was 64m
application start.
Times of 64Mb max memory are long over now.
regards
Leon
On 10/13/06, Alan Flisch [EMAIL PROTECTED] wrote:
Hi,
I was having some problems with perm gen space on one of our tomcat
instances and decided to increase the perm gen size and review the
JAVA_OPTS
of memory) and are guessed by the vm (if not
explicitely specified) upon application start.
Times of 64Mb max memory are long over now.
regards
Leon
On 10/13/06, Alan Flisch [EMAIL PROTECTED] wrote:
Hi,
I was having some problems with perm gen space on one of our tomcat
instances
(if not
explicitely specified) upon application start.
Times of 64Mb max memory are long over now.
regards
Leon
On 10/13/06, Alan Flisch [EMAIL PROTECTED] wrote:
Hi,
I was having some problems with perm gen space on one of our tomcat
instances and decided
On Fri, 2006-10-13 at 12:28 +0200, Leon Rosenberg wrote:
The default memory values depends on your machine (processor speed and
count, total amount of memory) and are guessed by the vm (if not
explicitely specified) upon application start.
Times of 64Mb max memory are long over now
:
The default memory values depends on your machine (processor speed and
count, total amount of memory) and are guessed by the vm (if not
explicitely specified) upon application start.
Times of 64Mb max memory are long over now.
regards
Leon
On 10/13/06, Alan Flisch
Nope - the 32Bit JVM can only deal with about 1.5GB Ram
Andrew
On 13/10/2006, at 2:51 PM, Alan Flisch wrote:
I thought you were safe up to 4000m (in practice a little lower)
for the
32 bit VM.
Regards,
Alan
-
To start
Leon,
The default memory values depends on your machine (processor speed and
count, total amount of memory) and are guessed by the vm (if not
explicitely specified) upon application start.
Times of 64Mb max memory are long over now.
Really? Seems like 32-bit Sun JVM on Sparc has exactly 64MB
Rosenberg wrote:
The default memory values depends on your machine (processor speed and
count, total amount of memory) and are guessed by the vm (if not
explicitely specified) upon application start.
Times of 64Mb max memory are long over now.
regards
Leon
(if not
explicitely specified) upon application start.
Times of 64Mb max memory are long over now.
Really? Seems like 32-bit Sun JVM on Sparc has exactly 64MB max value by
default:
http://java.sun.com/docs/hotspot/gc5.0/gc_tuning_5.html#0.0.0.%20Total%20Heap%7Coutline
...or are we on a higher version
Rosenberg wrote:
The default memory values depends on your machine (processor
speed and
count, total amount of memory) and are guessed by the vm (if not
explicitely specified) upon application start.
Times of 64Mb max memory are long over now.
regards
From: Andrew Miehs [mailto:[EMAIL PROTECTED]
Subject: Re: Max Memory Reading
Nope - the 32Bit JVM can only deal with about 1.5GB Ram
That's a Windows, not JVM, limitation. The virtual memory setup is
different on Solaris, so higher values are possible.
- Chuck
THIS COMMUNICATION MAY
From: Alan Flisch [mailto:[EMAIL PROTECTED]
Subject: Re: Max Memory Reading
I thought you were safe up to 4000m (in practice a little
lower) for the 32 bit VM.
Depends on the OS. For Windows, the limit is around 1.5 - 1.6 GB, since
the JVM code, heap, several ancilliary DLLs, and other
From: Leon Rosenberg [mailto:[EMAIL PROTECTED]
Subject: Re: Max Memory Reading
On the other side, if you are on 64bit OS (and you probably are, or
how could you adress 16GB otherwise), why not using 64bit jdk?
Did Solaris 5.9 have a 64-bit version? It's a bit on the old side, so I
doubt
From: Leon Rosenberg [mailto:[EMAIL PROTECTED]
Subject: Re: Max Memory Reading
unfortunately google is not your friend in this case and the document
seems outdated :-)
http://java.sun.com/docs/hotspot/gc5.0/ergo5.html
Why do you think it's outdated? What's described is what the current
:
From: Leon Rosenberg [mailto:[EMAIL PROTECTED]
Subject: Re: Max Memory Reading
unfortunately google is not your friend in this case and the document
seems outdated :-)
http://java.sun.com/docs/hotspot/gc5.0/ergo5.html
Why do you think it's outdated? What's described is what
From: Alan Flisch [mailto:[EMAIL PROTECTED]
Subject: RE: Max Memory Reading
It seems to be contradicted by this document
http://java.sun.com/j2se/1.5.0/docs/guide/vm/gc-ergonomics.html and by
my experience of seeing a near 1GB heap with no -Xmx option set
anywhere.
Maybe I'm confused
, Caldarale, Charles R wrote:
From: Alan Flisch [mailto:[EMAIL PROTECTED]
Subject: RE: Max Memory Reading
It seems to be contradicted by this document
http://java.sun.com/j2se/1.5.0/docs/guide/vm/gc-ergonomics.html and by
my experience of seeing a near 1GB heap with no -Xmx option set
thats the one.
Maybe wrong is a too hard word, but thedefault 64 MB it talks about
seem to be a special case not applicable as default :-)
regards
Leon
Regards,
Alan
On Fri, 2006-10-13 at 09:41 -0500, Caldarale, Charles R wrote:
From: Alan Flisch [mailto:[EMAIL PROTECTED]
Subject: RE: Max
: Max Memory Reading
Nope - the 32Bit JVM can only deal with about 1.5GB Ram
That's a Windows, not JVM, limitation. The virtual memory setup is
different on Solaris, so higher values are possible.
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
MATERIAL
From: joon yoo [mailto:[EMAIL PROTECTED]
Subject: Re: Max Memory Reading
is it a windows limitation or an intel x86 limitation?
Windows, due to limiting an individual process' virtual space to 2 GB.
(Some versions of Windows Server allow configuration of a 3 GB process
space
Im here again.
It's a 32 bits OS
Definely GC gonna take longer if has more to collect.
-Original Message-
From: anjan bacchu [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 05, 2006 6:20 PM
To: Tomcat Users List
Subject: Re: max memory..
can I move to 2048mb without any problem
[mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 05, 2006 6:20 PM
To: Tomcat Users List
Subject: Re: max memory..
can I move to 2048mb without any problem ? SURE, YES
4 GB RAM -- did you tune the BOOT.INI setting to use the /3GB setting so
that the user process address space goes to 3 GB(from 2 GB
I don't agree
Our tomcat was working with 1440 mb as initial and max memory without
problem.
-Original Message-
From: Leon Rosenberg [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 06, 2006 9:06 AM
To: Tomcat Users List
Subject: Re: max memory..
On a 32bit OS you will have
Runtime.getTotalMemory actually returns 2Gb?
On 9/6/06, Asensio, Rodrigo [EMAIL PROTECTED] wrote:
I don't agree
Our tomcat was working with 1440 mb as initial and max memory without
problem.
-Original Message-
From: Leon Rosenberg [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 06
No, right now I have set the memory to 1024 mb. getTotalMemory is
returning that same value
-Original Message-
From: Leon Rosenberg [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 06, 2006 9:27 AM
To: Tomcat Users List
Subject: Re: max memory..
Runtime.getTotalMemory actually
]
Sent: Wednesday, September 06, 2006 10:26 AM
To: Tomcat Users List
Subject: RE: max memory..
No, right now I have set the memory to 1024 mb. getTotalMemory is
returning that same value
-Original Message-
From: Leon Rosenberg [mailto:[EMAIL PROTECTED]
Sent: Wednesday, September 06, 2006 9:27
Hello guys
tomcat 5517
java 1508
win 2003 server
I have available 4 gb of ram memory into the server. My tomcat is
running with 1024 mb right now.
Before start to optimize my functions :D , can I move to 2048mb without
any problem ?
memory settings has always to be pow of 2 ?
thanks
Rodrigo
are you using a 64bit version? If yes than the answer is yes.
Otherwise its probably no :-)
regards
Leon
On 9/5/06, Asensio, Rodrigo [EMAIL PROTECTED] wrote:
Hello guys
tomcat 5517
java 1508
win 2003 server
I have available 4 gb of ram memory into the server. My tomcat is
running with 1024
There would be no adverse effect on garbage collection (i.e. longer GC
times) when moving from max heap of 1gb to 4gb?
-nikita
Leon Rosenberg wrote:
are you using a 64bit version? If yes than the answer is yes.
Otherwise its probably no :-)
regards
Leon
On 9/5/06, Asensio, Rodrigo [EMAIL
Hello,
can I move to 2048mb without any problem ?
Leon Rosenberg wrote:
are you using a 64bit version? If yes than the answer is yes.
Otherwise its probably no :-)
Is this really just a 32 vs 64bit decision? What about garbage
collection cycles?
What about more than one instance of tomcat for
I discovered no difference in performance between running 1 tomcat, or 4
tomcats on the one machine - same performance.
The machine was a 4x Opteron 870 with 8GB RAM, running Java 1.5.6 32bit.
Andrew
Boris Unckel wrote:
Hello,
can I move to 2048mb without any problem ?
Leon Rosenberg
Boris, search the archives, Chrales once gava a detailed answer on this topic.
Short version:
until you have 8 processors you shouldn't worry about the garbage collector.
If you have 8 you should set the number of garbage collection threads
accordingly.
leon
On 9/5/06, Boris Unckel [EMAIL
can I move to 2048mb without any problem ? SURE, YES
4 GB RAM -- did you tune the BOOT.INI setting to use the /3GB setting so
that the
user process address space goes to 3 GB(from 2 GB default) ?
related things for performance :
are you using the APR extension ?
how about tweaking the
how to increment the max memory of Tomcat´s JVM?? Because this is for default
63 Mb, I need increment this count.
Thanks!!!
Iósev Pérez Rivero
Estudiantes de 4to Año
Universidad de las Ciencias Informáticas
-
To start a new
Iosev Perez Rivero wrote:
how to increment the max memory of Tomcat´s JVM?? Because this is for default
63 Mb, I need increment this count.
Tomcat use -server parametar and on new Java VM it means 256MB of memory
by default.
Anyway, if you need more memory change $CATALINA_HOME/bin
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