diff options
Diffstat (limited to 'archives/extend/2013-September/000227.html')
| -rw-r--r-- | archives/extend/2013-September/000227.html | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/archives/extend/2013-September/000227.html b/archives/extend/2013-September/000227.html new file mode 100644 index 00000000..9863b688 --- /dev/null +++ b/archives/extend/2013-September/000227.html @@ -0,0 +1,104 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<HTML> + <HEAD> + <TITLE> [99s-extend] Cowboy load test + </TITLE> + <LINK REL="Index" HREF="index.html" > + <LINK REL="made" HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20Cowboy%20load%20test&In-Reply-To=%3CCAOBKReerkZKL_Rm9j7X4FH3YUbFHZDGHiVojNgO7WepOWCc_eQ%40mail.gmail.com%3E"> + <META NAME="robots" CONTENT="index,nofollow"> + <style type="text/css"> + pre { + white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ + } + </style> + <META http-equiv="Content-Type" content="text/html; charset=us-ascii"> + + <LINK REL="Next" HREF="000228.html"> + </HEAD> + <BODY BGCOLOR="#ffffff"> + <H1>[99s-extend] Cowboy load test</H1> + <B>Joe Freeman</B> + <A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20Cowboy%20load%20test&In-Reply-To=%3CCAOBKReerkZKL_Rm9j7X4FH3YUbFHZDGHiVojNgO7WepOWCc_eQ%40mail.gmail.com%3E" + TITLE="[99s-extend] Cowboy load test">joe.freeman at bitroot.com + </A><BR> + <I>Sun Sep 15 19:01:30 CEST 2013</I> + <P><UL> + + <LI>Next message: <A HREF="000228.html">[99s-extend] Cowboy load test +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#227">[ date ]</a> + <a href="thread.html#227">[ thread ]</a> + <a href="subject.html#227">[ subject ]</a> + <a href="author.html#227">[ author ]</a> + </LI> + </UL> + <HR> +<!--beginarticle--> +<PRE>Hi, + +I've started work on a project using Clojure, but I was wondering whether +(and secretly hoping that) Erlang would be a better fit, so I've been load +testing a few web server frameworks. I'm particularly interested in how the +server can handle a large number of concurrent WebSocket connections, and +the test I've been running is similar to Eric Moritz's [1]. + +I've setup a simple Cowboy 'echo' server running on an EC2 instance +(m1.medium, as in Eric's test) which could comfortably handle 10k +concurrent WebSocket requests (as in Eric's results), while echoing about +200 messages/second. The CPU usage of the VM at this point is about 99%, +but the server continues to handle up to 40k concurrent connections with a +consistent average response time (<30ms). Pushing the test beyond this +number results in a spike in response times and lots of connection timeouts. + +40k connections seems pretty good, but when comparing this to the same test +against a couple of Clojure/JVM-based frameworks (specifically Aleph/Netty +and http-kit) I find I can get higher numbers of concurrent connections +with slightly better average response times (100k connections, <10ms +response time) using much less CPU (~20%). In fact, memory seems to be the +limiting factor. + +So I have two questions: + +1) Should I be concerned about the CPU usage in the Erlang/Cowboy test? I +have limited experience with Erlang so far, but 100% CPU feels like a bad +thing. + +2) Is there any way to increase the performance of the cowboy server? Are +there any Erlang VM parameters I can change? The fact that the Clojure/JVM +tests (on the same machine) have managed to get to 100k connections +suggests that the limitation isn't being imposed by the operating system +(I've applied changes various changes to sysctl and ulimit). + +(Perhaps an echo server isn't the best way to compare HTTP servers, but it +feels like a good starting point.) + +Thanks for any help. + +[1] <A HREF="https://github.com/ericmoritz/wsdemo/blob/results-v1/results.md">https://github.com/ericmoritz/wsdemo/blob/results-v1/results.md</A> - the +GitHub repo actually contains code for an Aleph server, but results from +this aren't included in the summary here. +-------------- next part -------------- +An HTML attachment was scrubbed... +URL: <<A HREF="http://lists.ninenines.eu/archives/extend/attachments/20130915/c9a5340e/attachment.html">http://lists.ninenines.eu/archives/extend/attachments/20130915/c9a5340e/attachment.html</A>> +</PRE> + +<!--endarticle--> + <HR> + <P><UL> + <!--threads--> + + <LI>Next message: <A HREF="000228.html">[99s-extend] Cowboy load test +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#227">[ date ]</a> + <a href="thread.html#227">[ thread ]</a> + <a href="subject.html#227">[ subject ]</a> + <a href="author.html#227">[ author ]</a> + </LI> + </UL> + +<hr> +<a href="https://lists.ninenines.eu/listinfo/extend">More information about the Extend +mailing list</a><br> +</body></html> |