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 > > > ------------------------------------------------------------------------------ > _______________________________________________ > Factor-talk mailing list > Factor-talk@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/factor-talk >
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