[mapserver-users] Using Fast CGI with MapServer toalleviate poor performance

[Steve Lime]

MapServer WMS is just a wrapper around the CGI so they should be very close in speed. It would be interesting
to capture actual calls made by OpenLayers and then debug independently.

Steve

>>> On 9/18/2008 at 2:59 PM, in message
<48D2C1470200005300040D45 at stirling.iso.port.ac.uk>, "John Westwood"
<John.Westwood at port.ac.uk> wrote:
> Hi Paul and other MapServer Gurus,
> 
> I have discovered a huge speed increase by using OpenLayers.MapServer 
> (native) layers instead of OpenLayers.WMS layers. It is about ten times 
> faster, I do not exaggerate. Why is WMS so slow? I have read that MapServer 
> is a fast WMS server, have I done something wrong for it not to be?
> 
> What do you think could be the problem?
> 
> I will give it some thought tomorrow.
> 
> John
> 
> 
> 
> 
>>>> "Paul Ramsey" <pramsey at cleverelephant.ca> 17/09/08 5:15 PM >>>
> John,
> 
> The idea that CGI is naturally a much slower situation than a
> long-running process is a bit of a red herring in the case of
> Mapserver, and I say that as someone who is anal retentive about these
> things.  Unless your Mapserver installation has some naturally latent
> components (database connections, primarily) you'll find that moving
> from CGI to FastCGI is worth about 15ms per request.
> 
> On Wed, Sep 17, 2008 at 8:40 AM, John Westwood <John.Westwood at port.ac.uk> 
> wrote:
> 
>> The reason I am trying to get MapServer to work with fast_cgi is because I 
> am experiencing poor performance with OpenLayers. I believe that OpenLayers 
> starts a new MapServer instance for each tile request, thus causing an 
> unnecessary overhead. Am I correct?
> 
> Yes and no. If you are experiencing noticeably poor performance (you
> can actually *see* it being slow) the only place that the CGI overhead
> could be the cause is if you're connecting to Oracle or SDE for some
> of your layers. If that's not the case, look elsewhere first, the very
> small gains you will receive from moving to FastCGI will not change
> your underlying problem.
> 
> Paul
> 
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