"I have a mind like a steel... uh... thingy." Patrick Logan's weblog.

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Monday, October 29, 2007

Viking Calls BS

Erik Onnen (rightly) calls BS on the Apache vs. Yaws comparison. maybe his call out will dig up more details or lead to better comparisons.

/But likening the Erlang community to Microsoft is going too far. :-/

3 comments:

Israel L said...

Sure, the delays between characters are unrealistic, but they are designed to show what happens when lots of TCP connections are coming in to your apache box.

The results simply show Apache's weak concurrency model. POLL a few thousand connections and Apache will start dying-- regardless of OS or kernel version.

That's why event-driven servers like Zeus or Lighttpd are preferable in high concurrent load situations. FWIW, the Juniper DX load balancer itself is an event-driven web server that can scale to 500,000 + concurrent connections.

Scaling to lots of simultaneous users is all about how you handle concurrency. And Apache doesn't do a good job.

See http://www.kegel.com/c10k.html for other points.

Anonymous said...

Speaking of comparisons involving Microsoft, have you looked at the waves Mozilla's Prism is making in the RIA space?

Erik Onnen said...

israel, that's unfortunately a bit of a dated analysis of Apache, roughly about three years out of date. Apache HTTPD is built on apr which uses the most suitable kernel polling implementation available, much like libevent. On Linux for example, that translates into epoll calls rather than polls, the difference in which is substantial.

I'd encourage you to test Apache mpm-worker against lightttpd on a platform that supports modern async I/O - every time I've done it Apache has slightly won out and is always on par with lightty. This includes Linux with epoll and kqueue on BSD.

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Portland, Oregon, United States
I'm usually writing from my favorite location on the planet, the pacific northwest of the u.s. I write for myself only and unless otherwise specified my posts here should not be taken as representing an official position of my employer. Contact me at my gee mail account, username patrickdlogan.