Re: [web-devel] [WAI] Switching to WAI/Warp...

Two questions: 1) what version of enumerator are you building against? Version 0.4.7 fixed a problem with (>>=) which might affect you. 2) what does the profiler say? It would be helpful to build enumerator with "-auto-all". G On Mon, Feb 21, 2011 at 6:19 PM, Bardur Arantsson wrote:

On 2011-02-20 12:08, Michael Snoyman wrote:

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On Sun, Feb 20, 2011 at 12:00 PM, Bardur Arantsson  wrote:

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On 2011-02-20 10:29, Michael Snoyman wrote:

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On Sun, Feb 20, 2011 at 11:04 AM, Bardur Arantsson  wrote:

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It's entirely possible that WAI/enumerators/builder/Warp is adding some overhead. But what exactly are you comparing against? Warp is *definitely* doing some extra stuff that a simple Data.ByteString.hPut is not, such as timeout handling. I'd be interested in any numbers that you come up with from profiling, please do share.

Silly of me, I should have explained properly: I'm comparing against a simple monadic HTTP server using the "HTTP" module for parsing/rendering requests and response headers (so regular Strings) and simple (strict) bytestring output in the IO monad. Socket operations were handled using the network/network-bytestring packages.

While I can readily accept a little extra overhead from a more elegant model like WAI/Warp, I don't think 5-10% CPU usage is reasonable for streaming data to a *single* client on a reasonably beefy 2.4GHz Core2 CPU.

Given the Warp benchmarks that have been posted and the fact that my (admittedly slightly simpler) http server uses around 0-1% CPU, that makes me think that I'm probably doing something wrong.

Anyway, I'll see about producing some proper benchmarks (probably not until the weekend, though) and I guess I/we can take it from there.

Cheers,

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