[MetaCRS] Re: RFC #5 -- Multi-thread upgrade

[Hugues Wisniewski]

Hi Paul,

Thanks for your input

>I am comfortable with the memory and performance cost of fully caching all grid files in use

This has been discussed quite heavily and the good thing of this RFC is that it leaves the long term door open for large grid files like in Canada.
While for a single user the memory hit would not be bad, for other situations like in a server environment e.g. MapGuide that is using CS-Map, that could become a problem. That's why the current proposal is to have not all grid file transformations treated the same way at first.

You mention Lidar. 
What's the plan there? Is it that you'd be implementing a multithreaded transformation breaking up a point cloud into smaller clouds to speed up the process?

Thanks

Hugues

-----Original Message-----
From: metacrs-bounces at lists.osgeo.org [mailto:metacrs-bounces at lists.osgeo.org] On Behalf Of Paul Nalos
Sent: Thursday, July 14, 2011 7:01 PM
To: metacrs at lists.osgeo.org
Subject: [MetaCRS] Re: RFC #5 -- Multi-thread upgrade

On behalf of Safe Software, I'd like to express our "+1" for this
proposal. (We're not part of the PSC.)

These improvements would be a significant benefit to us and our users,
and I'm comfortable with the trade-offs involved.

We'd plan to integrate the new functionality into our product (FME)
and test environment, with a focus on raster and LiDAR reprojection,
where the performance gains would be most pronounced.

I have one minor comment on the proposal. Quoting narrowly:

> Unless the file is buffered in its entirity, the object becomes non-reentrant.

I'm convinced there are other options for providing partial buffering
while maintaining reentrancy (involving some kind of locking or
critical section), but am comfortable with the memory and performance
cost of fully caching all grid files in use.

Regards,

--------------------------------

Paul Nalos | Database Team Lead

Safe Software Inc.
T 604.501.9985 x 301
paul.nalos at safe.com | www.safe.com

--------------------------------

> I have posted an RFC to http://trac.geo.org/csmap concerning an upgrade to CS-MAP with regard to its ability to function in a multi-threaded environment:
>
>                http://trac.osgeo.org/csmap/wiki/CsMapRfc5
>
> Please review and comment as soon as is convenient for you.
>
> Thanks a lot.
>
> Norm
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