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Postings from May 2007
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Moin,
On Sunday 27 May 2007 14:43:15 Tels wrote:
> Moin,
>
> a patch to update Math::BigInt::FastCalc in blead to v0.15. Noteworthy
> changes:
>
> * alias the _nok() method so that Bnok() can use it through Calc
> * add _new() to the XS code, making ->new() faster. For small numbers
> it is about 10% faster, and up to 25% for large/huge numbers. This
> speedup is visible in Math::BigInt, btw, not just deep down in the
> lower level library. See attached benchmark.
>
> One issue that came to light is that a seemingly simple operation as:
>
> use Math::BigFloat;
> $x = Math::BigFloat->new('0.008'); $y = Math::BigFloat->new(2);
> $x->bdiv(3,$y);
>
> causes 27 calls to _new() inside Calc/FastCalc. This suggests some
> complicated operations inside BigFloat/BigInt, which should be
> investigated, sowe can minimize the calls.
Even stranger is that when running under Calc (e.g. not FastCalc) it becomes
49 calls. The reason is that somewhere along the way $scale becomes a
BigInt object, which then gets stored as a part of a BigFloat - this
shouldn't even happen and I am surprised it actually works. (The reason it
works is probably because BigInt's overload magic is sufficiently
transparent enough that things just get slower, but don't blowup).
Still investigating the problem (which is somewhere inside BigInt or
BigFloat).
Tels
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