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

Gregory Collins greg at gregorycollins.net
Mon Feb 21 18:35:02 CET 2011

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".


On Mon, Feb 21, 2011 at 6:19 PM, Bardur Arantsson <spam at scientician.net> wrote:
> On 2011-02-20 12:08, Michael Snoyman wrote:
>> On Sun, Feb 20, 2011 at 12:00 PM, Bardur Arantsson<spam at scientician.net>
>>  wrote:
>>> On 2011-02-20 10:29, Michael Snoyman wrote:
>>>> On Sun, Feb 20, 2011 at 11:04 AM, Bardur Arantsson<spam at scientician.net>
>>>>  wrote:
>>> [--snip--]
>> 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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Gregory Collins <greg at gregorycollins.net>

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