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<TITLE>Re: [mapserver-users] High CPU</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Steve -<BR>
<BR>
Your CPU spends 100% of its time doing SOMETHING. You seem to be focusing on high CPU utilization by a process as being a bad thing, and in many case it is instead a very good thing. Many MapServer applications are I/O bound, waiting for disk seeks, etc. Since your CPU is not waiting for I/O to any significant degree, 100% CPU utilization means you’re not suffering from that I/O limitation.<BR>
<BR>
If your machine is not doing anything else, seeing 100% CPU utilization is good. If you are testing with 10 other applications in active use, having one of them consume 100% of the CPU is bad. But I think you may need to do more sophisticated load testing in order to evaluate your situation; adding more RAM is most likely to be helpful in a multi-user, heavily-loaded situation. It might not help much, however, and you can only tell by doing multi-user (and in your case, multi-application) simulated load tests.<BR>
<BR>
- Ed<BR>
<BR>
Ed McNierney<BR>
205 Indian Hill Road<BR>
Groton, MA 01450<BR>
<a href="ed@mcnierney.com">ed@mcnierney.com</a><BR>
+1 (978) 761-0049<BR>
<BR>
<BR>
<BR>
On 9/7/08 4:32 PM, "Steve White" <<a href="steve@online-archaeology.co.uk">steve@online-archaeology.co.uk</a>> wrote:<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Ed –<BR>
<BR>
The reason I feel edgy is because I have other hosted .NET applications on the same box.<BR>
<BR>
I discovered from my tests that another process (CSRSS.exe) is also using excessive CPU (about 40%), so it’s not all MapServer, so I’m going to set up some auto tests scripts to find out what kind of a ceiling I have and see if I can pull down CSRSS.exe a bit.<BR>
<BR>
Cheers,<BR>
<BR>
Steve<BR>
<BR>
<BR>
</SPAN><FONT SIZE="2"><SPAN STYLE='font-size:10pt'><B>From:</B> Ed McNierney [<a href="mailto:ed@mcnierney.com">mailto:ed@mcnierney.com</a>] <BR>
<B>Sent:</B> 07 September 2008 13:48<BR>
<B>To:</B> Steve White; Paul Ramsey<BR>
<B>Cc:</B> <a href="mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a><BR>
<B>Subject:</B> Re: [mapserver-users] High CPU<BR>
</SPAN></FONT></FONT><FONT FACE="Times New Roman"><SPAN STYLE='font-size:12pt'> <BR>
</SPAN></FONT><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Steve -<BR>
<BR>
Would you prefer your CPU was sitting idle? Keeping the CPU busy is a good thing, isn’t it? It means your network, disk, and other resources are not preventing your CPU from working at full capacity.<BR>
<BR>
What makes you feel that running your CPU at 100% capacity is a bad thing?<BR>
<BR>
- Ed<BR>
<BR>
Ed McNierney<BR>
205 Indian Hill Road<BR>
Groton, MA 01450<BR>
<a href="ed@mcnierney.com">ed@mcnierney.com</a><BR>
+1 (978) 761-0049<BR>
<BR>
<BR>
<BR>
On 9/7/08 4:20 AM, "Steve White" <<a href="steve@online-archaeology.co.uk">steve@online-archaeology.co.uk</a>> wrote:<BR>
The problem is that CPU shoots to 100% while tiles are being generated from<BR>
a remote WMS call.<BR>
<BR>
The shp2img dump was taken directly on the server but the problem occurs<BR>
when I send remote WMS requests to the server.<BR>
<BR>
I'm starting to think that 640MB RAM isn't enough and I should probably bump<BR>
it up to 1GB.<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: Paul Ramsey [<a href="mailto:pramsey@cleverelephant.ca">mailto:pramsey@cleverelephant.ca</a>]<BR>
Sent: 07 September 2008 06:07<BR>
To: Steve White<BR>
Cc: <a href="mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a><BR>
Subject: Re: [mapserver-users] High CPU<BR>
<BR>
It took 0.3s to run to completion, what's the problem precisely?<BR>
<BR>
P.<BR>
<BR>
On Sat, Sep 6, 2008 at 1:35 PM, Steve White<BR>
<<a href="steve@online-archaeology.co.uk">steve@online-archaeology.co.uk</a>> wrote:<BR>
> Thanks Jeff -<BR>
><BR>
><BR>
><BR>
> - I upgraded to MS4w 2.2.9<BR>
><BR>
> - I ran shptree.exe and produced the index file<BR>
><BR>
> - My results of shp2img.exe are below<BR>
><BR>
> - I don't think any projections-on-the-fly are occurring<BR>
><BR>
><BR>
><BR>
> Shp2img dump:<BR>
><BR>
><BR>
><BR>
> msDrawMap(): Layer 0 (OA), 0.015s<BR>
><BR>
> msDrawMap(): Drawing Label Cache, 0.000s<BR>
><BR>
> msDrawMap() total time: 0.015s<BR>
><BR>
> SaveImage() total time: 0.297s<BR>
><BR>
> msFreeMap(): freeing map at 0144B498.<BR>
><BR>
><BR>
><BR>
> I'm still getting very high CPU usage with just one active session, so<BR>
> there's no way I can go into production till this is resolved.<BR>
><BR>
><BR>
><BR>
> Any other things I can look at?<BR>
><BR>
><BR>
><BR>
> Cheers,<BR>
><BR>
><BR>
><BR>
> Steve<BR>
><BR>
> _______________________________________________<BR>
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><BR>
><BR>
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<BR>
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