iis60入門(mén)及進(jìn)階系列之四-文庫(kù)吧
2025-04-24 20:36 本頁(yè)面
【正文】 to app pool ? Miniweb servers ? Contains all W3SVC functionality ? Loads ISAPI’s – both site filters and extensions ? Separates W3SVC from INETINFO Web Admin Service Universal Listener Worker Process Worker Process Worker Process Worker Process W3ADM’s Management Role ? W3ADM is responsible for controlling the lifetime of the worker processes: ? When to start a worker process ? When to recycle a worker process if it is unable to process any more requests (bees blocked). ? CPU monitoring is configured to stop an app pool after consuming too much CPU. ? Initiation of rapidfail protection causes an application pool to stop. ? A configuration error caused by trying to use an incorrect identity causes an application pool to stop. ? A Windows administrator performs a demand stop or start on an application pool. ? In IIS5IM mode, W3ADM will try attempt to restart INETINFO if it crashes. Worker Process ? Contains a master DLL () that implements all request handling logic ? Requests are routed through to the worker process and W3SVC ? Is effectively administered and managed by W3SVC ? Can be loaded into INETINFO (IIS5IM) or (WPIM) ? Serves only one app pool Application Pools ? A group of one or more URL namespaces served by a worker process ? Can be started and stopped like sites ? Can be configured for health detection, recycling, etc. ? Serve all content for a web app (vs. only ISAPI on IIS4/5) and Application Pools ? requests a worker process for the app pool if there is demand. ? If the app pool is not started, requests for the app pool will receive a ‘Service Unavailable’ message. ? If a worker process has been shut down by W3ADM, then can restart it if the AppPoolAutoStart metabase property is set to TRUE (the default). Web Gardens An app pool served by more than one worker process is a web garden. ? To enable this, set the MaxProcess value 1. ? A benefit to Web gardens is that if one worker process gets bogged down (script engine hangs), there are other worker processes available to accept and process requests. Web Garden application pool Worker process ISAPI ISAPI Filter W3ADM Worker process ISAPI ISAPI Filter Worker process ISAPI ISAPI Filter Worker process ISAPI ISAPI Filter Processor Affinity ? Setting processor affinity means assigning specific processes or applications to a specific processor. ? Controlling processor affinity can improve performance by reducing the number of processor cache flushes as threads move from one processor to another. ? Advanced configurations using Web gardens and processor affinity can be used on multiprocessor puters where clusters of CPUs can be dedicated to specific application pools. App Domain App Domain App Domain App Domain App Domain App Domain App Domain App Domain Application Pool W3SVC App pool App pool ? Application Domains ? Lightweight CLR unit of isolation ? One application domain per IIS application ? Combine with to achieve high scalability and isolation ? manages application domains independently ? Recycled within a single process ? Can have private ponents, session variables , etc. Brief Overview .NET Application Domains vs. Application Pools Reliability Be
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號(hào)-1