# [plt-scheme] JIT and flonums

 From: Doug Williams (m.douglas.williams at gmail.com) Date: Fri Jan 4 09:36:29 EST 2008 Previous message: [plt-scheme] JIT and flonums Next message: [plt-scheme] JIT and flonums Messages sorted by: [date] [thread] [subject] [author]

```Any idea on the second problem/feature - subcollections not working (or not
available) in PLaneT?

Doug

On Jan 4, 2008 7:27 AM, Matthew Flatt <mflatt at cs.utah.edu> wrote:

> The JIT flonum problems have been fixed, and the JIT's flonum support
> is re-enabled in SVN.
>
> There's a good chance that your plots will work, now. The JIT bug was
> leaving the FP stack in a bad state, which mostly affected FP code
> *not* generated by the JIT (e.g., the FP code in the plot library).
>
> Matthew
>
> At Thu, 3 Jan 2008 20:46:39 -0700, Matthew Flatt wrote:
> > We've discovered today some problems with the JIT's new flonum handling.
> > That may be the problem with the plots.
> >
> > It's not quite fixed, yet, so I've disabled the JIT's flonum code for
> > now in SVN.
> >
> > Matthew
> >
> > At Thu, 3 Jan 2008 17:33:34 -0700, "Doug Williams" wrote:
> > > The problem does seem to be in PLoT.  When I run demo-1.ss (in
> C:\Program
> > > Files\PLT-FULL-3.99.0.8\collects\plot\demos on my machine), it
> generally has
> > > an empty plot.  Occasionally it will show the plot - maybe 1 time in
> 10 or
> > > so, the other times it is just the axes and labels.  [Don't be
> confused by
> > > the image in the source file, which also prints out when evaluated.  I
> just
> > > comment it out or delete it.  Then just hit the run button repeatedly.
> > > Also, it has to be run in the Pretty Big language because of
> build-list.]
> > >
> > > I also checked it with some of the science collections tests (for
> example,
> > > uniform-int-histogram-int-example.ss in the example subdirectory of
> the
> > > science collection, which doesn't have the subcollection reference
> > > problem).  It exhibits the same behavior.
> > >
> > > For the PLaneT subcollection problem, the exact error message I get
> is:
> > > bernoulli-example.ss:1:9: planet: bad module path in: (planet "
> bernoulli.ss"
> > > ("williams" "science.plt") "random-distributions").  But, (require
> (planet "
> > > science.ss" ("williams" "science.plt"))) works fine.
> > >
> > > But there is a noticeable speedup in the overall test execution.
> > >
> > > On Jan 3, 2008 3:25 PM, Doug Williams <m.douglas.williams at gmail.com>
> wrote:
> > >
> > > > I tried running the science collection examples in 3.99.  Most of
> the
> > > > plots were just empty, so I need to see if it's a problem with the
> PLoT
> > > > package or with my code.  [They didn't error, just gave empty
> plots.]  For
> > > > the ones that did run and which are computationally intensive (with
> > flonums)
> > > > - like Chebyshev evaluation and (especially) the ordinary
> differential
> > > > equation solvers - they 'seemed' much faster.  But, it's anecdotal -
> I just
> > > > eyeballed it.  I have to track down my uses of set-cdr!, etc in the
> > > > simulation collection before I try any of my larger examples there.
> > > >
> > > > One interesting problem came up.  Has the use of subcollections in
> PLaneT
> > > > changed with 3.99?  For example, (require (planet "bernoulli.ss"
> > > > ("williams" "science.plt") "random-distributions")) says it can't
> find the
> > > > file, but it works fine in V372 (and before).
> > > >
> > > > Doug
> > > >
> > > >
> > > >
> > > > On Dec 28, 2007 3:55 PM, Noel Welsh <noelwelsh at gmail.com> wrote:
> > > >
> > > > > Joyous day!  Should my code run in 3.99 I'll do some benchmarking.
> > > > >
> > > > > N.
> > > > >
> > > > > On Dec 28, 2007 10:52 PM, Matthew Flatt < mflatt at cs.utah.edu>
> wrote:
> > > > > > The latest in SVN (v3.99.0.7) includes new JIT support on x86
> for
> > > > > > inlining flonum (i.e., inexact real) arithmetic. I expect to
> fill in
> > > > > > x86_64 and PPC support next week.
> > > > > >
> > > > > > This change makes inexact-heavy microbenchmarks run 2-3 times as
> fast.
> > > > > > It might be useful for real programs, too, but I don't seem to
> have
> > > > > any
> > > > > > interesting floating-point applications to try out.
> > > > > >
> > > > > > Matthew
> > > > > _________________________________________________
> > > > >  http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> > > > >
> > > >
> > > >
> > _________________________________________________