[Tilecache] tips on seeding the cache

[angus scown]

the speed issue was resolved in two manners
1) fix the dns resolution as there was a delay in the resolution causing 
a significant pause on each request
2) move to mod_python

Now getting a much more respectable throughput.
eg. [0.1685s 6.138/s]

angus scown wrote:
> WMS layer - correct.  I am using version 1.9.  Mapserver is running as 
> CGI and hums along nicely answering WMS requests.  Things slow down 
> when tilecache makes the WMS request.  Subsequent requests to 
> tilecache are snappy but it seems to be taking a long time to do the 
> WMS request. 
>
> I installed tilecache and altered my apache2 config to
>     AddHandler cgi-script .cgi
>     Options +ExecCGI
>
> so I assume this means it is running as Python CGI.  So I guess the 
> slow part is the CGI execution for each request. 
>
> Christopher Schmidt wrote:
>> On Wed, Oct 17, 2007 at 11:31:59AM +1000, angus scown wrote:
>>   
>>> I am trying to understand how to increase the throughput of the seeding 
>>> program.  Watching the output as it churns through the requests I am 
>>> trying to debug where the blockage  is.  Each tile is taking 20 seconds 
>>> to create.  If I look at the apache log and mimic the requests the tile 
>>> cache is making to the WMS the requests are returning images in 
>>> subsecond response times as is expected. 
>>>
>>> The server it is running on is not under any load and I am trying to 
>>> work out where the throughput blockage is.  I am getting results such as 
>>> [20.4531s : 0.048/s] 52/252 from the seed program. 
>>>     
>>
>> I'm guessing this is a WMS layer? MetaTiling in use? Any other strange
>> setup? 1.9, or SVN? Running on the server as CGI, mod_python, other?  
>>
>> Regards,
>>   
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