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 <[EMAIL PROTECTED]>, "John Westwood" <[EMAIL PROTECTED]> 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" <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> > 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 > > _______________________________________________ > mapserver-users mailing list > mapserver-users@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/mapserver-users _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users