[mapguide-users] mgcooker : use more cpu resource ?

[Lisa Weber]

Remy,

 

I have had similar experiences. I have tested the same tile cache process using MgCooker on two servers and a desktop and found it difficult to sustain a CPU usage above 27%. When I greatly increased the number of concurrent requests (over 10) that lifted the CPU to 34%, but a lot of tiles began to file, and the RAM usage maxxed out.

I found the only way to avoid failed tiles was to reduce the number of concurrent requests to 5 or less. This did not speed up the process significantly, as I generated the tiles a number of times using different numbers of concurrent requests.

The fastest configuration was the machine with the most RAM available which was the desktop, even with concurrent requests set to 1. The servers ran much slower, even though they were both multi-threaded.

 

 

 

Lisa

 

From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Rémy Gourrat
Sent: Saturday, 3 October 2015 7:58 PM
To: mapguide-users at lists.osgeo.org
Subject: Re: [mapguide-users] mgcooker : use more cpu resource ?

 

Thanks for your help.

 

I tried 

-          3 threading concurrent request, CPU increase to 75%.

 

But CPU vary between 8% and 41%

 

But after maybe 90000 tiles, mgcooker failed to render tiles and I have this message  :

 

Nom de l’application défaillante w3wp.exe, version : 7.5.7601.17514, horodatage : 0x4ce7afa2

Nom du module défaillant : MgMapGuideCommon.dll_unloaded, version : 0.0.0.0, horodatage : 0x529df5b5

Code d’exception : 0xc0000005

Décalage d’erreur : 0x0000000002da407d

ID du processus défaillant : 0x1fe0

Heure de début de l’application défaillante : 0x01d0fdaea9720738

Chemin d’accès de l’application défaillante : c:\windows\system32\inetsrv\w3wp.exe

Chemin d’accès du module défaillant: MgMapGuideCommon.dll

ID de rapport : 41de8723-69a2-11e5-9391-00155d2dc611

 

I tried 3 times  and same result.

-          2 threading concurrent request, CPU increase to 41%.

 

But CPU vary between 14% and 41%

 

Very strange too, total used memory display in task manager  increase very high (7.9 Go for 8Go) but when I check in resource monitor the memory addition process is not equal to the indication of task manager.

 

Mgserver.exe used only 360 Mo.

 

With resource monitor I see this :

o   Reserved material : 1 Mo

o   Used : 2236 Mo

o   Modified : 5000 Mo

o   Sleeped : 790 Mo

o   Free : 0 Mo

 

With Process Monitor (Procmon.exe) I see that for each tile mgserver.exe access to *.CS*.dll (il oose the name.

Is it normal ? it’s not a issue for performance.

 

Finally mgcooker failed to render tiles

 

On same time running, It seems that with one Thread mgcooker generate more tiles than with 2 or 3 trheads, because I think that with 2 or 3 treads there is  too much variation.

 

Thanks for ideas.

AG-Carto - Bayonne 

 

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