ISAPI Thread Pool for use in Delphi WebBroker applications

Quoted: I don't recall mentioning the ISAPIThreadPool unit here and recently Allen pointed out a Borland public newsgroup post where a customer was talking about the dramatic performance difference between his PHP application and his Delphi Webbroker application. In the post he mentioned: If I understand this correctly the above is unnecessary and instead this developer should leverage the ISAPIThreadPool unit available with Delphi as well as from CodeCentral. The ISAPIThreadPool unit leverages the technologies discussed in the following documents (also mentioned in the source code):

• John Vert "Writing Scalable Applications for Windows NT"
• Ruediger Asche "Writing Windows NT Server Applications in MFC Using I/O Completion Ports"
• Gregory Leake "Architecture Decisions for Dynamic Web Applications: Performance, Scalability, and Reliability" (unfortunately, it appears that this document is no longer available from MSDN)

A few key points:

• ISAPIThreadPool.pas should be included in your webbroker DPR at the end of the uses clause as it reimplements GetExtensionVersion, HttpExtensionProc and TerminateExtension.
• This unit is only useful for applications running on Microsoft's web server (IIS).

Dan Miser has also mentioned this unit on his blog. Thanks Dan!