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From Pid <>
Subject Re: Tomcat memory requirements
Date Wed, 25 Jan 2012 21:34:17 GMT
On 25/01/2012 18:19, Celso Magalhães Dantas Neto wrote:
> Thanks everyone for the reply!
> My problem is not to argue how the application is consuming RAM, but to
> show that 150MB is not too much memory. But for that I'd like to use
> trusted information such as an article, or official info. The client
> doesn't understand anything about technologies but has opened the Windows
> Task Manager and saw that Tomcat is on top 3 in memory consumption. I just
> need to argue with him that 150MB is normal for a Java web app.
> I know that "normal" really depends on how your/my application has been
> developed but I was just wondering if I could find information about memory
> consumption of a small 1 CRUD application (for example).
> And yes I could start Tomcat with no app, and create a 1 CRUD application,
> but I would prefer to argue with some trusted article or official
> information.
> Ah! BTW, I'm not complaining about Java or Tomcat memory consumption! I'm
> just trying to argue with the client. =D
> And I'm running Tomcat 6 and Java 1.6

I work for a fairly large & well known company that ships a commercial
version of Tomcat with the default heap size set to 512Mb.

I regularly see heaps of 2Gb and more at work with customers.

Quibbling about memory size because the number 'seems a bit large' is a
waste of your customer and your own time.  If they're not paying for you
for the time you take to explain, just tell them it's normal & move on.


> thanks, again!
> --
> *Pesquisa & Inovação
> + 55 71 2101.4104  |  skype: celsomdantas*
> Antes de imprimir pense em seu compromisso com o Meio Ambiente.
> On Wed, Jan 25, 2012 at 3:45 PM, André Warnier <> wrote:
>> Pid * wrote:
>> ...
>>> And of this, a Tomcat instance with just the ROOT application can be
>>> observed to consume from ~6Mb to ~10Mb of RAM in the object heap with
>>> a nice stable sawtooth on most systems.
>>>  Not that I want to cast doubt upon your measurements, but somehow that
>> seems hard to believe.  This is without any requests being processed,
>> surely ?
>> A standard out-of-the-box tomcat-7 on my Windows XP 32-bit laptop, started
>> from the command window with startup.bat, shows 40 MB in Task Manager,
>> without any requests being processed. Granted, that probably includes the
>> demo apps, but still.
>> It goes to 50 MB as soon as I call up the home page.
>> Ah, OK, you were just talking about the heap..
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