I replaced the calls to get-in with a my-get-in macro that "compiled"
them to nested calls on the map or vector:
(my-get-in sle [:A 1 2]) =>
(((sle :A) 1) 2)
The form (data key) seems to be about 10 to 15 times faster than the
equivalent (get-in data [key]) on my laptop.
It cut the runtime in half or so. I would think that floating point
operations might be faster, too.
On Oct 9, 6:38 am, "andi.xeno...@googlemail.com"
<andi.xeno...@googlemail.com> wrote:
> Hi,
>
> I'm new to Clojure, and let me first say that I love it! At least I
> love the language, but I have some concerns regarding performance:
>
> My first try was to implement a Gauß elemination algorithm for solving
> a system of linear equations. Here is the code:
>
> http://www.xenoage.com/extern/zongblog/matrix.clj
>
> Solving 1.000.000 SLEs (see last line) took 33.000 ms on my machine,
> while the corresponding algorithm written in Java needed less than 300
> ms.
>
> Since I am a Java programmer and I have no experience in functional
> programming, I probably have to apologize for the bad code. Anyway, I
> already tried to make it faster using the well-known performance tips
> (like type hints), but they did not really help (ok, 25.000 ms instead
> of 33.000, but it is still too much).
>
> What are my options?
> - Can you identify problems in my code? I do not mean things that make
> it 10% faster, but at least double as fast.
> - Could you say, that Clojure is not made for such numerical things,
> and I should use Java code for these performance-critical algorithms?
> (would be perfectly ok for me)
> - Should I try it in Clojure, but using a (mutable) Java array instead
> (also ok for me, since this mutable structure is only used locally and
> within a single thread)
>
> Any ideas? Thanks in advance :-)
>
> Andi
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