Question on PageMap

[David R Robison <dr...@openroadsconsulting.com>]

I have been monitoring the size of the pm-null file stored in the Work 
directory from Tomcat. I assume that it is the serialized version of the 
PageMap. I have an application where, if I navigate from page A to page 
B and then back to page A, the pm-null file keeps growing. I understand 
that I can set the maximum number of pages saved in the PageMap but I am 
not sure what the default is set to. Also, if I am leaving a page with a 
form and do not intend to return to that page and submit its values, do 
I even need it in the PageMap? Is there a way I can remove my page from 
the PageMap when I know I am no longer going to need its values? My end 
goal is to try and squeeze more performance out of my application. I 
hope this is understandable... any thoughts?

-- 

David R Robison
Open Roads Consulting, Inc.
103 Watson Road, Chesapeake, VA 23320
phone: (757) 546-3401
e-mail: drrobison@openroadsconsulting.com
web: http://openroadsconsulting.com
blog: http://therobe.blogspot.com
book: http://www.xulonpress.com/book_detail.php?id=2579


 




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Re: Question on PageMap

[Erik van Oosten <e....@grons.nl>]

> I am not sure what the default is set to
Look at the constructors of DiskPageStore.

> My end goal is to try and squeeze more performance out of my application.
If that is your goal you are on the wrong track. The disk store is a 
rotating logging based, mostly write-only store. Logging based as new 
content is written sequentially from start to end of the file, rotated 
because when the file is full it starts at byte 0 thereby overwriting 
old pages. It is mostly write-only as only when a user presses the back 
button data may be read back from the page store.

Early removal of data will only mean more disk-head movements making it 
slower instead of faster.

Regards,
    Erik.



David R Robison wrote:
> I have been monitoring the size of the pm-null file stored in the Work 
> directory from Tomcat. I assume that it is the serialized version of 
> the PageMap. I have an application where, if I navigate from page A to 
> page B and then back to page A, the pm-null file keeps growing. I 
> understand that I can set the maximum number of pages saved in the 
> PageMap but I am not sure what the default is set to. Also, if I am 
> leaving a page with a form and do not intend to return to that page 
> and submit its values, do I even need it in the PageMap? Is there a 
> way I can remove my page from the PageMap when I know I am no longer 
> going to need its values? My end goal is to try and squeeze more 
> performance out of my application. I hope this is understandable... 
> any thoughts?
>


-- 
Erik van Oosten
http://www.day-to-day-stuff.blogspot.com/



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