Hi Andy,<br>Thanks for your answer.<br>The dataset is composed of several ECW files, that's why we use TILEINDEX.<br>The data are hosted on EBS (<a href="http://aws.amazon.com/ebs/">http://aws.amazon.com/ebs/</a>). 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. <br>
My goal is to have a 1s response time. Do I dream too much ?<br>Cédric<br><br><div class="gmail_quote">2010/8/2 Andy Colson <span dir="ltr"><<a href="mailto:andy@squeakycode.net">andy@squeakycode.net</a>></span><br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="im">On 8/2/2010 5:06 AM, Cédric MOULLET wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hello,<br>
We've got a 150 GB ECW dataset (aerial imagery) and the LAYER<br>
configuration uses a TILEINDEX.<br>
We can observe a WMS request time of about 3 seconds (on a server with<br>
this configuration: 7.5 GB RAM, 4 core, 64 bits / MapServer 5.4.3).<br>
I'd like to know if 3 seconds is considered as a normal response time<br>
for this kind of WMS request.<br>
What could be done in order to improve this performance (I'm aware of<br>
<a href="http://www.mapserver.org/optimization/raster.html" target="_blank">http://www.mapserver.org/optimization/raster.html</a>) ?<br>
Thanks !<br>
Cédric<br>
<br>
</blockquote>
<br></div>
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:<br>
<br>
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?<br>
<br>
2) if it is one big file, how would you feel about trying it broken up into smaller files?<br><font color="#888888">
<br>
-Andy<br>
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