![]() If your system starts swapping, this is a sign that you need more RAM. It is especially important to try to eliminate swap file usage as much as you can. The overall aim of adjustments to improve performance is to use RAM (cacheing) and to reduce disk-based activity. ![]() Once you have quantitative data about how your system is performing currently, you'll be able to determine if the change you have made has had any real impact. For Linux try LBS (Note: Last updated May 2002) and for Windows use the Performance Monitor. 8 Performance of different Moodle modulesīefore attempting any optimization, you should obtain a baseline benchmark of the component of the system you are trying to improve.5.5 Lighttpd, NginX and Cherokee performance.If your interested in learning more about the internals of the ASP.NET Worker Process and inparticular how ASP.NET works ‘under the hood’ you’re best to look at Rick Strahl‘s *excellent* article – A Low-Level look at teh ASP. ![]() Just how far down does the rabbit hole go? Read the TechNet articles on more information about the HTTP Protocol Stack in IIS 6.0. It first parses the request and dispatches it to the IIS 6.0 Worker Process ( w3wp.exe) which then loads the ASP.NET ISAPI ( aspnet_isapi) and follows on down the rabbit hole. This acts as the gateway for the incoming requests for the web-server. However in IIS 6.x the process is a little different, specifically we have a kernel mode HTTP driver ( http.sys) which ships apart of the Windows Networking subsystem. In version 5.x of IIS the ASP.NET ISAPI Filter ( aspnet_isapi) which is an unmanaged piece of code that runs within the inetinfo.exe process that offloads the work to the ASP.NET Worker Process ( aspnet_wp) that trickles the workload down the rabbit hole. Web applications run with the Network Service identity, which provides a security advantage: the Network Service account has lower access privileges than LocalSystem. Worker process isolation mode delivers all the benefits of IIS 6.0 new architecture: robust application pooling automated restarts, scalability, debugging and finely-tuned performance tuning. If the IIS server is running under I IS 5.0 Isolation Mode, then you need to attach to the ASP.NET Worker Process ( aspnet_wp.exe) where as if your running under the Worker Process Isolation Mode (which is the default in IIS 6.0) you will need to attach to the w3wp.exe process. Why the aspnet_wp.exe and w3wp.exe difference? Sometimes you may need to untick “Enable Just My Code (Managed Only)” in the Options > Debugging list.
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