I don't deny that. I even know that it is unwise. But your claim that you
can't run JMeter with -Xmx1024M on a system with only 1 GB of memory is
technically false: it will run, badly probably, but it will run!

So from that aspect, you won't be able to tell that it is a bad decision
to assign that much memory on such a low spec machine. You will only
(hopefully!) notice it from erratic results when running a loadtest. Only
knowledge of how virtual memory, Java etc works will allow you to make an
educated decision on sizing the memory parameters.

Mark

> from a server side java perspective, using virtual memory will kill the
> vm's
> performance
> regards
> deepak
>
> On Fri, Oct 2, 2009 at 12:48 AM, Mark Rotteveel <m...@pluton.nl> wrote:
>
>>
>> > I assume you mean
>> > -Xms512M and -Xmx1024M . if you system only has 1GB i doubt you can
>> run
>> > jmeter with -Xmx1024M
>> > see
>> >
>> http://jakarta.apache.org/jmeter/usermanual/best-practices.html#lean_mean
>>
>> It will work due to the magic of virtual memory, but usually it is wise
>> to
>> leave at least 128 MB of physical memory available for the OS and other
>> processes (and more memory if there are a lot of different processes).

-- 
Mark Rotteveel
Pluton IT


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