Re: Tomcat with 8 GB memory

[Alexey Solofnenko]

No, each of two 4GB processes will have only a half of the objects under the same load. And I heard that GC does not scale linear with heap size. And this is without multi-threading performance considerations. As usual, your mileage may vary and only tests can tell for sure.

- Alexey.

Caldarale, Charles R wrote:

From: Alexey Solofnenko [mailto:[EMAIL PROTECTED] Subject: Re: Tomcat with 8 GB memory

I was under impression that GC does not scale linearly. That means one 8GB process will be slower than two 4GB processes.

Not true.  The time of a full GC using modern algorithms depends mostly
on the number and type of live objects, not the amount of heap space.
The number and type of live (reachable) objects stays relatively
constant for most application once the ramp-up period is over.
Consequently, running a single JVM with the largest heap you can fit in
the process space is the most efficient from a GC point of view.  (Of
course, there are plenty of other reasons not to put all your eggs in
one basket.)

 - Chuck


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Alexey N. Solofnenko <http://trelony.cjb.net/>
Pleasant Hill, CA (GMT-8 usually)

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