RE: Java performance (Saxon)

> Kay Michael wrote:
> 
> >                    A         B         C         D       E
> > Saxon 5.2, Sun     9.4       15.9      19.3      20.1    5.3
> > Saxon 5.2, MS      4.9        9.5      11.8      12.9   20.0
> > Saxon 5.3, Sun     7.3       12.3      18.4      18.0    5.8
> > Saxon 5.3, MS      3.1        5.2      19.0      10.8   19.8
> 
> Is this with the JIT enabled?? 

Yes.

Just to update the picture for anyone who is interested, I've pinned down
the anomalous behaviour of stylesheet E to to format-number() function. On
Microsoft, the cost of this is linear: 1000 calls take 2163 ms, 16000 calls
take 33167 ms. With SUN (now using JRE 1.3 - thanks for the tip) it's better
than linear: 1000 calls take 621 ms, 16000 calls take 3265 ms, 128000 calls
take 19989 ms.

format-number() is implemented using Java classes DecimalFormatSymbols and
DecimalFormat. I guess SUN are somehow remembering that the same format
pattern is used each time. Don't know how they do it, but it points to
another area for possible tuning.

Mike Kay 


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