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Re: Performance improvement for a recursive function?

Subject: Re: Performance improvement for a recursive function?
From: Manfred Staudinger <manfred.staudinger@xxxxxxxxx>
Date: Tue, 13 Dec 2011 16:47:32 +0100
Re:  Performance improvement for a recursive function?
On 13/12/2011, Michael Kay <mike@xxxxxxxxxxxx> wrote:
> Sorry, haven't studied the problem in enough detail to answer this. The
> 9.3 code is clearly suboptimal, and is fixed in 9.4, which is all I
> really needed to establish.
No problem, will try it with 9.4 and report.


On 13/12/2011, Andrew Welch <andrew.j.welch@xxxxxxxxx> wrote:
>> On 13/12/2011, Michael Kay <mike@xxxxxxxxxxxx> wrote:
>>>> to process 41337 path commands it takes 861 sec! The first 5000 path
>>>> commands are processed in 14 sec (at 355.87 per sec) the last 5000
>>>> take 671 sec (only at 7.5 per sec).
>>> I'm seeing an execution time of about 90 seconds under Saxon-EE
>>>, down to 23 seconds under Saxon-EE
>> What baffles me is that with each tail-recursion it takes longer to
>> execute the function! Do you see this also with 9.4? Any idea about
>> the possible reason?
> Garbage collection, disk thrashing ?
> 1gb isn't much...
> --
> Andrew Welch
> http://andrewjwelch.com

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