[mapserver-users] WMS Orthophoto performance

[Cédric MOULLET]

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 <andy at squeakycode.net>

> 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
>



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