Date: Sat, 18 Oct 2003 17:11:57 -0400 From: Yaoping Ruan <yruan@cs.princeton.edu> To: rodrigc@crodrigues.org Cc: freebsd-hackers@freebsd.org Subject: Re: Benchmarking kqueue() performance? Message-ID: <3F91AC9D.DDCF0261@cs.princeton.edu>
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Hi, We've done some sort of tests in terms of the performance of kqueue( ) and select( ). We used a event-driven web server, which has both kevent() and select() implementation. We designed a workload called hot-cold test, which has multiple clients machines request up to thousands of persistent connections, but only dynamically pick some of them(1%, 2%, 5%, 15%) issue HTTP requests (hot connections), others just stay idle (cold connections). Thus a high cost event driven mechanism may spend more time picking up the right connections having real requests. The results show that the kqueue( ) has neglectable cost on throughput. But the select( ) version server has about 20% of the full bandwidth when 1% of the workloads are hot, but jump to 90% of the full bandwidth when 15% of the workloads are hot. I've put the two result graphs on: www.cs.princeton.edu/~yruan/flexiclient But I have to admit that we didn't scale the demand too much, just up to 2000 connections. (but the FD set for the queue should be larger since there're open files.) - Yaoping Ruan Computer Science Dept. Princeton University
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