On 3/23/2016 9:19 AM, Christopher Schultz wrote:
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David,
On 3/23/16 8:02 AM, David kerber wrote:
On 3/23/2016 3:36 AM, Mahudeswaran A wrote:
Hello All, Is there any recommended maximum setting for tomcat-6
32bit version running on windows 64bit OS
No, there is not. It all depends on your app's requirements. I
have applications for which 64MB is plenty, and others which need
1024MB. I think the max on 32-bit is 2048MB (2GB), but I'm not
sure of that.
Something like that, depending upon a few things. I think I wasn't
able to get above 1520MiB on 32-bit Windows, but that's because of
some weirdness the OS does with kernel-versus-process address space.
Evidently, the process can have 32-bit pointers, but reserves *half*
of that for kernel space. You used to be able to use some kind of boot
parameter to set that kernel/process split to 3GiB/1GiB... not sure if
that works anymore. It doesn't matter, though... everyone should be on
64-bit, now.
If you are running on a 64-bit OS, it *generally* makes sense to use a
64-bit JVM, but I can see lots of reasons to use a 32-bit JVM - if you
can get away with it - mostly memory-related.
We run 32-bit to simplify installations. We have several non-java
applications that are still 32-bit, and running 32-bit java lets us get
away with installing only one set of db drivers and ODBC DSNs, which all
applications (both java and non-java) can use. None of them need 64-bit
java just for memory requirements.
64-bit JVMs can use compressed object pointers (and they do by
default) to take up less memory than if they used native pointers, but
the reality is that a 64-bit JVM simply requires more memory than the
same exact application running under a 32-bit JVM.
If you can get away with less than ~2GiB of heap, then I would say
stick with the 32-bit JVM. You can always move to 64-bit.
Note that Tomcat itself is 100% Java and so there isn't really a
"32-bit Tomcat" though it is packaged that way: the 32-bit package
just has a 32-bit installer and is bundled with the 32-bit Windows
service, a 32-bit tcnative, etc.
We would like to change the default setting and looking for max
size/count for 32bit tomcat-6 running on 64bit windows OS. Min
heap size=? Max heap size=? Max Thread count=?
IMO, you should only use as much memory as you actually need. Some
people like allocating enormous heaps because "more is better", but I
tend to think that if you have a huge heap, it will take you forever
to notice any kinds of memory problems that you have.
- -chris
(Still very happily running in production with 512MiB heaps for our
"biggest" web applications.)
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