Re: [OpenMap Users] help eliminating RPF 'load' time

Hi Lonnie, Leah,

The code that tries to figure out what coverage areas are appropriate
for the current projection was modified in 4.6 to try to do better at
zone boundaries when zoomed out. That may be causing some additional
work for displaying data.

Leah - I don't have 17Gb of data, though, so I haven't seen the
behavior of the layer under that kind of management load. How many
RPF directories do you have (how many A.TOC files are being loaded).
If there are a lot, and they are being downloaded over the network at
startup, it might to take a while.

- Don

On May 18, 2004, at 9:11 AM, Lonnie Goad wrote:

> I experienced the same problem when switching over to version 4.6.  I
> have not as of yet had time to investigate why, but I will be sure to
> post something if I find a solution.  I hope you will do the same. 
> Thanks.
>
>  
>
> -----Original Message-----
> From: owner-openmap-users@bbn.com [mailto:owner-openmap-users@bbn.com]
> On Behalf Of Leah Wong
> Sent: Tuesday, May 18, 2004 11:46 AM
> To: openmap-users@bbn.com
> Subject: [OpenMap Users] help eliminating RPF 'load' time
>
>  
>
> Greetings,
>
>  
>
> I am seeing a long delay for OpenMap to initialize the RPF layer.  We
> have approximately 17Gig of CIB1, CIB5, CIB10 all the way to GNC data
> for one country.  The RPF layer takes approximately 10 minutes to
> 'load' although the initial scale is at full world (thus no RPF should
> be displayed yet).
>
>  
>
> Our map files are stored on a network.  There are a few things we have
> tried to increase performance.  First we tried making one 'master'
> A.TOC file for all the directories.  The performance boost here was
> nominal.  Then we generated the 'master' A.TOC file locally on the
> client. This netted us a noticeable performance increase.  However,
> that is not a practical solution for our situation.
>
>  
>
> Are there any property file changes I can make?  Something that would
> do lazy loading so the user doesn't take the initial performance hit
> up front?  Are there recommendations as to how to build paths, A.TOC
> files, etc?
>
>  
>
> Sincerely,
>
> Leah Wong
>
>  
>

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, dietrick@bbn.com
BBN Technologies, Cambridge, MA
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

--
[To unsubscribe to this list send an email to "majdart@bbn.com"
with the following text in the BODY of the message "unsubscribe openmap-users"]