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hi...

i'm trying to use a java server in windows xp and in linux FC3 i'm
trying to see how much memory they will take.

using Alt+Ctrl+Del in windows i can see that the java process takes
around 193mb , but in linux's x system monitor i can see it takes
around 422mb does it make sense?

Elhanan wrote:
> hi...
>
> i'm trying to use a java server in windows xp and in linux FC3 i'm
> trying to see how much memory they will take.
>
> using Alt+Ctrl+Del in windows i can see that the java process takes
> around 193mb , but in linux's x system monitor i can see it takes
> around 422mb does it make sense?

It's likely that task manager is only showing you the active memory
used, and not the memory that's been paged out. Goto View->Select
Columns, and check Virtual Memory Size, and any other memory-related
columns that tickle your fancy.

And what in the world could be eating nearly half a gigabyte of memory?

pwt wrote:

> Elhanan wrote:
>> hi...
>>
>> i'm trying to use a java server in windows xp and in linux FC3 i'm
>> trying to see how much memory they will take.
>>
>> using Alt+Ctrl+Del in windows i can see that the java process takes
>> around 193mb , but in linux's x system monitor i can see it takes
>> around 422mb does it make sense?
>
> It's likely that task manager is only showing you the active memory
> used, and not the memory that's been paged out. Goto View->Select
> Columns, and check Virtual Memory Size, and any other memory-related
> columns that tickle your fancy.
>
> And what in the world could be eating nearly half a gigabyte of memory?

Because of the way Linux's threading model interacts with Java, Linux will
report the total memory used as the memory used for each thread.

So if you have an application with 3 threads running with a total
application memory usage of 193Mb, you may see 579Mb as the memory usage in
some tools.

Matt

Matt Parker wrote:
>
> Because of the way Linux's threading model interacts with Java, Linux will
> report the total memory used as the memory used for each thread.
>
> So if you have an application with 3 threads running with a total
> application memory usage of 193Mb, you may see 579Mb as the memory usage in
> some tools.

Didn't kernel 2.4 sort that?

Still Linux and Windows report memory in very different ways, and the
two are not directly comparable. On Windows, I believe, reported memory
usage can depend upon whether some DLLs are considered as part of the
operating system or not. So you can't even compare Windows applications
together.

Tom Hawtin
--
Unemployed English Java programmer
http://jroller.com/page/tackline/