On Monday, November 17, 2014 5:00:23 PM UTC-5, Jules wrote:
>
> Back in February, I posted about some prototype code I had put together
> that attempted an alternative approach to map-merging that promised to be
> faster and generate less churn than the standard approach.
>
> Glen Mailer suggested that I put it in a standalone library. At the time,
> I thought that this would not be possible because of its necessarily tight
> coupling to clojure.lang.PersistentHashMap, but then I found some more
> time, went away and had a go.
>
> Here it is:
>
> https://github.com/JulesGosnell/seqspert
>
> along with some other hash-set, vector and array related stuff that I have
> been playing with, instructions to set it up in Lein and example code to
> paste straight into the repl to see how well it performs in your test
> environment.
>
> Some simple testing indicates that the larger the map and the greater the
> number of threads that you can run in parallel, the better results you will
> see. I have seen 30x speedups on a 16-way box merging two hash-maps of 10M
> entries each.
>
> Please take a look at it and let me know about any issues, improvements,
> results etc - I'd be very interested to hear from you.
>
> I'll put out a stable release in a while, once interested parties have
> kicked the tyres a bit.
>
> regards,
>
>
> Jules
>
Looks like you're seeing a general 2x speedup, and an orthogonal
${num_cores} speedup from parallelization. What's the source of the general
2x speedup? Algorithmic improvement? Use of transients?
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