Date: Fri, 20 Apr 2001 09:11:32 -0700 From: Jef Poskanzer <jef@acme.com> To: Alfred Perlstein <bright@wintelcom.net> Cc: sthaug@nethelp.no, hackers@FreeBSD.ORG Subject: Re: thttpd hack for sendfile and accept filters. Message-ID: <200104201611.JAA95537@bomb.acme.com> In-Reply-To: Your message of Fri, 20 Apr 2001 05:23:37 PDT.
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The accept-filters change is already on my short list to add. I'll
probably use your version.
sendfile() probably doesn't make sense in a non-blocking server - wouldn't
it block until the entire file is sent? I do plan to use it in my
other server mini_httpd.
As for making thttpd use multiple processes (each doing non-blocking I/O),
yes definitely. I did it in the commercial server I worked on for a
while and it was a big win. There are two parts to this:
- Collect global state into a single struct and share it among the
processes via an anonymous mmap. This would include the throttling
table.
- A round-robin token-passing scheme to determine which process gets
to do the accept(). Turns out it's very bad to just have all the
processes do an accept(), since every time there's a new connection
*all* the processes wake up. The context switches totally kill
performance. But a properly tuned round-robin scheme works great.
I'm not sure when I'll add this, but it's definitely in the works.
---
Jef
Jef Poskanzer jef@acme.com http://www.acme.com/jef/
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