[erlang-questions] slow file I/O (was Not an Erlang fan)

Steve Vinoski <>
Thu Sep 27 21:36:52 CEST 2007


On 9/27/07, Claes Wikstrom <> wrote:
>
>
> Originally at Bluetail, we had some serious problems with
> high performance file I/O, especially line oriented such.
>
> I then wrote a portable (yes win32 too) linked in driver
> for fast FILE I/O. It's based on an old and hacked version
> of the BSD FILE* interface. It's called bfile and we've
> been using it in pretty much all projects during the past 8
> years. I've prepared a tarball of it at
>
> http://yaws.hyber.org/download/bfile-1.0.tgz
>
> Here's an (slightly edited) example shell session:
>
> 2> bfile:load_driver().
> ok
> 4> {ok, Fd} = bfile:fopen("Makefile", "r").
> {ok,{bfile,#Port<0.98>}}
> 5> bfile:fgets(Fd).
> {line,<<10>>}
> 6> bfile:fgets(Fd).
> {line,<<10>>}
> 7> bfile:fgets(Fd).
> {line,<<97,108,108,58,32,10>>}
> 14> bfile:fread(Fd, 10000).
> {ok,<<10,10,105,110,115,116,97,108,108,58,32,97,108,108,10,9
> ,40,99,100,32,99,95,115,114,99

,59,32,...>>}
> 15> bfile:fread(Fd, 10000).
> eof
>
> It should be equally fast as the same code in C.
>

Very cool! Between this and the regexp library you posted yesterday, the Tim
Bray "wide finder" problem has very likely just gotten a whole lot easier.

--steve
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