[Haskell-cafe] whatever happened to sendFile?

[Brandon S. Allbery KF8NH]

On 2008 Aug 13, at 15:04, Brandon S. Allbery KF8NH wrote:

>
> On 2008 Aug 13, at 15:01, Chaddaï Fouché wrote:
>
>> 2008/8/13 Jason Dusek <jason.dusek at gmail.com>:
>>> I found an old lib for it:
>>>
>>>  http://www.haskell.org/ghc/docs/6.0/html/unix/System.Sendfile.html
>>>
>>> Hoogle turns up nothing, though.
>>
>> That don't sound very useful... Maybe when we only had String it was
>> much more performant for big transfert, but now we can recode this in
>> one short line of ByteString code and get the same performance as C.
>
> sendfile() is actually a system call, not a library function.


I should clarify:  what sendfile() is supposed to optimize isn't  
writing large strings, or even the user<->kernel roundtrips; it's an  
optimization to the kernel network stack (network buffer management,  
to be specific).  Web servers use it to serve static content (e.g.  
icons, images, stylesheets) because it significantly reduces system  
load.

-- 
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH