I don't know what version of Factor you are using, but I made a couple
improvements improvements to sha checksums over the last year or two.
I can hash a 17 mb file in 4.5 seconds on my laptop:
IN: scratchpad "~/testfile" file-info size>> .
17825792
IN: scratchpad gc [ "~/testfile" sha-256 checksum-file ] time
Running time: 4.533698574 seconds
There is still a lot of optimization potential because it doesn't inline
fixnum arithmetic completely on 64-bit. I was working on it awhile ago and
didn't quite finish.
If you really need performance now, here's another way that calls out to
``shasum`` and is fast.
: shasum ( path -- checksum )
absolute-path { "shasum" "-a" "256" } swap suffix
utf8 [ readln ] with-process-reader " " split1 drop ;
IN: scratchpad [ "~/testfile" shasum ] time
Running time: 0.206797194 seconds
Hope that helps.
Best,
John.
On Mon, Sep 21, 2015 at 12:09 PM, Alexander Ilin <ajs...@yandex.ru> wrote:
> Hello!
>
> I just found out that calculation of SHA-256 checksum for a 17 Mb file
> takes about 200 seconds!
> Does anyone have an idea how to improve that figure by at least two
> orders of magnitude?
> sha256sum.exe does same in under 1 second.
>
> ---=====---
> Александр
>
>
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