Hi Andy, Thanks for your answer. The dataset is composed of several ECW files, that's why we use TILEINDEX. The data are hosted on EBS (http://aws.amazon.com/ebs/). It's supposed to have normal I/O performance, but probably not fantastic performance. Of what I have observed, I would say that the CPU is probably the bottleneck. My goal is to have a 1s response time. Do I dream too much ? Cédric
2010/8/2 Andy Colson <[email protected]> > On 8/2/2010 5:06 AM, Cédric MOULLET wrote: > >> Hello, >> We've got a 150 GB ECW dataset (aerial imagery) and the LAYER >> configuration uses a TILEINDEX. >> We can observe a WMS request time of about 3 seconds (on a server with >> this configuration: 7.5 GB RAM, 4 core, 64 bits / MapServer 5.4.3). >> I'd like to know if 3 seconds is considered as a normal response time >> for this kind of WMS request. >> What could be done in order to improve this performance (I'm aware of >> http://www.mapserver.org/optimization/raster.html) ? >> Thanks ! >> Cédric >> >> > Wow, that's a big file. Is that all in one file? I dont really know the > answer, I've never used anything over 4 gig, but I do have a few questions: > > 1) I assume you are IO bound, do you have this on a raid, or something with > fast IO? Can you check to see if you are CPU bound or IO bound? > > 2) if it is one big file, how would you feel about trying it broken up into > smaller files? > > -Andy > -- Welcome to my world: http://www.cedricmoullet.com/ My Linked In profile: http://www.linkedin.com/in/cedricmoullet Twitter: http://twitter.com/cedricmoullet Home sweet home: http://map.geo.admin.ch/?crosshair=bowl&zoom=11&X=185241.24219&Y=561288.90625&bgOpacity=0&selectedNode=node_ch.swisstopo.fixpunkte-lage1
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