On Sat, Mar 08, 2014 at 02:12:50PM -0500, David Larochelle wrote:
> On Sat, Mar 8, 2014 at 1:40 PM, Gyepi SAM <[email protected]> wrote:
>
> > For fun, I wrote a version in Go and it's twice as fast as the perl
> > version. I imagine a C version would be faster yet, but I get paid for that
> > kind of fun. I'd be happy to send you the Go version if you're interested.
>
>
>
> I'm curious how you account for disk caches when your bench marking. I
> fully expect that the CPU version of the code will be faster in GO than
> Perl. But I wonder how much this matters if the file isn't already in the
> disk cache.
>
> An interesting test would be to run the GO version first on a file that's
> you can be sure is not in the disk cache, then to run the Perl version on
> that file. I.e. let Perl benefit from the disk cache and see if GO is still
> faster.
I have an SSD drive on my linux laptop so disk caching plays less of a role in
my tests. I clear the cache with:
echo 3 | sudo tee /proc/sys/vm/drop_caches
I repeated the tests after clearing the disk cache each time and also ran each
test multiple times without clearing cache. The cached versions are a few
seconds faster, but the overall results are the same; the Go version is about
twice as fast.
-Gyepi
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