
anatoly techtonik<techtonik@gmail.com> wrote:
What about web-applications? Is that true that for FastCgi or mod_wsgi deamon mode interpreter and application is started only once per say 100 requests?
Yes. Only CGI programs reload on every use. FCGI/WSGI programs run more or less forever, and are only loaded once, reading requests and handling them. Some FCGI systems reload their applications once in a while, and ask the idle ones to exit after periods of no traffic, but that's a form of automatic performance tuning. And, of course, there are the permanently resident systems like Twisted. (Incidentally, if you run FCGI/WSGI programs under Apache, make sure that you don't put .fcgi scripts in a directory from which Apache will execute .cgi scripts. Apache will run the .fcgi script with CGI, and the WSGI Python module will detect this and run the script one time and exit for each request. Everything appears to work and performance is terrible.) If import performance is important in a production server environment, it's more useful to look at minimizing the number of loads rather than trying to make them faster. If and when Unladen Swallow finally gets going, startup times will get worse as the JIT compiler cranks, but run time will (hopefully) decrease. John Nagle
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John Nagle