[gambit-list] Leopard bug causing extremely slow parsing times

James Long longster at gmail.com
Sat Nov 10 01:11:01 EST 2007


It only fails when you change it to 0.01 because the compiled C code
is different, and test 5 diff's the generated c code with a
precompiled file.  So make the change, compile the file, and copy it
to test5.ok

$ ../gsc/gsc -:=.. -f -c mix.scm
$ cp mix.c test5.ok

Of course, that kind of nullifies test 5, but only until the Leopard
fix is incorporated into gambit.

On Nov 10, 2007 12:26 AM, Patrick Kelly <e at pdk.to> wrote:
> I think I did this right.  It took me a while to realize that I needed
> to make the change in _thread.scm, AND do all the "save some time"
> steps.
>
> Anyway, now I'm trying to run "make check" and it hangs on
>
> ../gsi/gsi -f mix.scm > test4.out
>
> I saw this in tests/mix.scm:
>
> (define heartbeat-interval
>   (##thread-heartbeat-interval-set! 0.0)) ; set and get smallest interval
>
> I tried changing to 0.01, but that caused a pretty nasty blowout.
>
> Is there a way to get this test to pass, or to skip it?
>
> thanks
>
>
> On Oct 29, 2007 8:56 PM, Marc Feeley <feeley at iro.umontreal.ca> wrote:
>
> > The problem is not with I/O. Apparently MacOS X has a very high
> > resolution interval timer (setitimer). When the Gambit thread system
> > is initialized, it sets up the interval timer for implementing the
> > thread quantum. In _thread.scm you will find this call:
> >
> > (##thread-heartbeat-interval-set! (macro-inexact-+0))
> >
> > which is the same as
> >
> > (##thread-heartbeat-interval-set! 0.0)
> >
> > The value 0.0 is a special value indicating that the shortest possible
> > time interval should be used. On MacOS 10.4 this time is 1e-2 or 1e-3
> > seconds (I don't remember which, but fairly coarse). On MacOS 10.5 the
> > time is 1e-6, i.e. one microsecond! Because the quantum is so small,
> > the system is spending a lot of time being interrupted by the timer
> > for no good reason.
> >
> > I just installed MacOS 10.5 and haven't yet installed Mercurial (so I
> > can't upload a patch). In the meantime simply replace the problematic
> > line in lib/_thread.scm by
> >
> > (##thread-heartbeat-interval-set! 0.01)
> >
> > and run "make".  Note that the compiler will take forever to compile
> > lib/_thread.scm (because gsc-comp will be running with a heartbeat
> > interval of 1e-6 second).  If you want to save some time do this:
> >
> > % cd lib
> > % echo "(##thread-heartbeat-interval-set! 0.01)" > gambcini.scm
> > % ../gsc-comp -:=.. -c -check _thread.scm
> > % ../gsc-comp -:=.. -link -flat -o _gambc.c _kernel.c _system.c _num.c
> > _std.c _eval.c _io.c _nonstd.c _thread.c _repl.c
> > % make
> > % cd ../gsc
> > % echo "(##thread-heartbeat-interval-set! 0.01)" > gambcini.scm
> > % ../gsc-comp -:=".." -link _host.c _utils.c _source.c _parms.c _env.c
> > _ptree1.c _ptree2.c _gvm.c _back.c _front.c _prims.c _t-c-1.c _t-c-2.c
> > _t-c-3.c _gsc.c
> > % make
> > % cp gsc ../gsc-comp
> > % cd ..
> > % make
> >
> >
>



-- 
James Long
Coptix, Inc.
longster at gmail.com



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