ArcGIS Server 9.3.1 (.NET) REST Services patch

coll5484 — Thu, 25 Jun 2009 20:54:00 GMT

In May 2009, a patch was made available on the ESRI Support Website for ArcGIS Server .NET customers that fixed a performance problem with REST Services. It is called: “ArcGIS (Desktop, Engine, Server) 9.3.1 REST Services Patch” and fixed the following issue:

Issues Addressed with this Patch

NIM045052 - Adding additional SOC machines does not improve ArcGIS Server system performance when using REST services.

Description: When the ArcGIS Server system is generating many responses per second in response to heavy client load, the W3WP and SOM grow continuously in size. This effect is usually not noticed until the ArcGIS Server is scaled with additional SOC machines. When the additional SOC machines are added and client request load is increased on the entire system, the W3WP and SOM processes grow in size and the SVCHOST process periodically excessively uses CPU resources. Coincident with this behavior is a drastic drop in requests that can be serviced per second no matter how many additional SOC machines are added. This patch addresses this problem and will allow extra SOCs to contribute linearly to handling additional load.

Some customers may have noticed that this patch was removed from the website for a short period of time, and has now returned. We apologize if this caused any inconvenience or confusion to you. It was removed to investigate a potential problem, and has now been returned in its original form. For any users that previously installed this patch, there is no need to re-install it.

For any users who haven’t installed this patch, it is recommended to install it on any ArcGIS Server 9.3.1 machines that are utilizing REST services.

We also want to take this opportunity to highlight some “Best Practices” to improve performance with the ArcGIS Server REST API for the Microsoft .NET Framework.

Please see the technical details in the following knowledge base article: HowTo: Configure ArcGIS Server REST API for the Microsoft .NET Framework to improve stability and performance

- Mike H., User Advocacy Group, ESRI Support Services

Support Center News Blog : KB 36887

ArcGIS Server 9.3.1 (.NET) REST Services patch