[Mono-dev] System.Decimal performance

[Andreas Nahr]

There are massive regressions in System.Data that seem to come from the
changes in decimal.c

Andreas

> -----Ursprüngliche Nachricht-----
> Von: mono-devel-list-bounces at lists.ximian.com [mailto:mono-devel-list-
> bounces at lists.ximian.com] Im Auftrag von Zoltan Varga
> Gesendet: Montag, 2. Juni 2008 22:15
> An: Leszek Ciesielski
> Cc: mono-devel-list
> Betreff: Re: [Mono-dev] System.Decimal performance
> 
>                  Hi,
> 
>   The next mono release (2.0) will have better decimal performance,
> especially
> when doing divisions.
> 
>                     Zoltan
> 
> 2008/5/29 Leszek Ciesielski <skolima at gmail.com>:
> > Hi,
> >
> > the company I work for builds finance-related software, so we use the
> > Decimal type a lot. And in any computation-heavy program we find that
> > the Mono implementation of the decimal type... well... let's just say
> > it's not on par with MS.Net performance ;-) . Addition, substraction
> > and multiplication lag a bit (2-4 times slower). However, division is
> > at least 10 times slower, in some cases even 50x! I don't have any
> > complex tests at hand right now, but a simple performance-measuring
> > program is attached to the mail. There's also a java version
> (although
> > BigDecimal is not a simple equivalent of System.Decimal as it has no
> > upper bound on available precision). From my simple test the results
> > are as follows:
> >
> > MS.Net 3.5
> > addition 2375 ms : 2354,156132
> > substraction 2140,625 ms : 2337,043868
> > multiplication 1734,375 ms : 189,08461995264
> > division 8468,75 ms : 29097,233616240416508043573961
> >
> > Mono 1.9 Windows 2.0 profile
> > addition 4812 ms : 2354,156132
> > substraction 4781 ms : 2337,043868
> > multiplication 3407 ms : 189,08461995264
> > division 61390 ms : 29097,233616240416508043573961
> >
> > Mono svn-linux 2.0 profile
> > addition 4201.837 ms : 2354.156132
> > substraction 4413.458 ms : 2337.043868
> > multiplication 4489.036 ms : 189.08461995264
> > division 61303.573 ms : 29097.233616240416508043573961
> >
> > Java 1.6.0_06
> > addition 4640 ms : 2354.156132
> > substraction 3969 ms : 2337.043868
> > multiplication 2219 ms : 189.08461995264
> > division 33376 ms : 29097.233616240416508043573961
> >
> > Has anyone done any performance tunining with the decimal type?
> >
> > Regards,
> >
> > Leszek 'skolima' Ciesielski
> >
> > --
> > MS-DOS user since 5.0
> > Windows user since 3.11
> > Linux user since kernel 2.4
> > Novell Netware user since 2.2
> > WARCRAFT user since 1.0
> >
> > _______________________________________________
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> > Mono-devel-list at lists.ximian.com
> > http://lists.ximian.com/mailman/listinfo/mono-devel-list
> >
> >
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