ByteString I/O Performance

[Donald Bruce Stewart]

simons:
> > import System.IO
> > import Foreign ( allocaBytes )
> > import qualified Data.ByteString as Str
> 
> > bufsize :: Int
> > bufsize = 4 * 1024
> 
> In order to determine I/O performance, a random 512 MB file is copied
> from standard input to standard output. All test programs have been
> compiled with GHC 6.6.1 using "-O2 -funbox-strict-fields" for
> optimization. The time to beat for this test comes from /bin/cat:
> 
>   $ dd if=/dev/urandom of=test.data bs=1M count=512
>   $ time /bin/cat <test.data  >/dev/null
> 
>   real          0m2.097s        0m2.135s        0m2.100s
>   user          0m0.036s        0m0.028s        0m0.024s
>   sys           0m2.060s        0m2.108s        0m2.076s

Thanks for the data points. It's been a while since I benchmarked the IO
performance, so looks like time to revisit this issue.

-- Don