Joey, another possibility is blas vs non-blas code being called.

foreign 9!:58 can set threshold
_1 (9!:58)"0 i.3       NB.  +/ .*  never use blas
0 (9!:58)"0 i.3        NB.  +/ .*  alwasy use blas

Can you try execute
_1 (9!:58)"0 i.3
then run your benchmark, then execute
0 (9!:58)"0 i.3
then run benchmark again and verify which mode you are using by default?


On Fri, May 15, 2020, 5:32 AM Joey K Tuttle <[email protected]> wrote:

> Installed under OS X 10.14.6 easily - but I'm puzzled why "my" benchmark
>
>    timex '%. 1000 1000 ?@$ 0'
>
> takes more than twice as much cpu compared to j901...  (space used is
> identical)
>
> > On 2020May 14, at 14:27, Henry Rich <[email protected]> wrote:
> >
> > This beta has a few language changes:
> >
> > * Fold (u F:. v) has been redefined to execute v first, then, u
> >
> > * u0`u1`...@v now has infinite rank.  v is executed first to decide the
> cell-rank, and which verb is to be executed for each cell; then the u verbs
> are executed, either one cell at a time or in one call to each verb, to
> execute on a list of cells at once. Therefore, each u verb needs to be able
> to handle single cell or a list of input cells.
> >
> > * semiduals are supported at last: x u&.:(v`a:) y applies v only to x,
> and x u&.:(a:`v) y applies v only to y.
> >
> > Henry Rich
> >
> > On 5/14/2020 3:49 PM, Eric Iverson wrote:
> >> The first 902 beta release is available for windows/macos/linux.
> >>
> >> https://code.jsoftware.com/wiki/System/Installation/J902
> >>
> >> Availability of new releases will be announced here.
> >>
> >> Questions, problems, etc should be addressed to the beta forum.
> >> ----------------------------------------------------------------------
> >> For information about J forums see http://www.jsoftware.com/forums.htm
> >
> >
> > --
> > This email has been checked for viruses by AVG.
> > https://www.avg.com
> >
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
>
> ----------------------------------------------------------------------
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>
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