Thanks, Bill and Henry. Using a non-JQt image reader seems to have done
the trick.
I will add this to my multi-threading notes.
On Tue, May 10, 2022 at 9:42 PM Henry Rich <henryhr...@gmail.com> wrote:
> read_image is not defined for me, nor is readimg_jqtide_.
>
> Henry Rich
>
>
>
> On 5/10/2022 8:13 PM, Devon McCormick wrote:
> > It's the "read_image_" line that seems to be where it hangs up for me, on
> > the fourth line from the end with the comment "¡Fails here!".
> > The invocation (for 5 threads) is:
> > mtFileWork t. '' MUTEX [ mtFileWork t. '' MUTEX [ mtFileWork t. '' MUTEX
> [
> > mtFileWork t. '' MUTEX [ mtFileWork t. '' MUTEX
> >
> > On Tue, May 10, 2022 at 6:22 PM Henry Rich <henryhr...@gmail.com> wrote:
> >
> >> What do I run to make it fail?
> >>
> >> Henry Rich
> >>
> >> On 5/10/2022 6:01 PM, Devon McCormick wrote:
> >>> Henry,
> >>> Here is the MVF - minimum viable failure. It looks like the culprit is
> >>> "read_image" which is just a cover for "readimg_jqtide_". I'm running
> >>> under jconsole.
> >>>
> >>> Set up in a directory with some .JPG files:
> >>> FLS=: 0{"1 dir '*.jpg'
> >>> createThreads 5
> >>> MUTEX=: 10 T. 1 NB. Recursive mutex; either fails.
> >>>
> >>> mtFileWork=: 3 : 0
> >>> tm=. 6!:1''
> >>> while. 0<#FLS do.
> >>> tn=. ":3 T. '' NB. Thread number as char
> >>> varnm=. ' '-.~'threadVar',tn
> >>> smoutput 'Thread ',tn,' locking at ',":qts''
> >>> 11 T. y
> >>> smoutput 'Thread ',tn,' locked at ',":qts''
> >>> (varnm,' FLS')=: split FLS
> >>> smoutput 'Thread ',tn,' unlocking at ',(":qts''),' for file
> >> ',flnm=.
> >>>> ".varnm
> >>> 13 T. y
> >>> smoutput 'Thread ',tn,' unlocked at ',":qts''
> >>> #read_image flnm NB. ¡Fails here!
> >>> end.
> >>> tm=. tm,~6!:1''
> >>> NB.EG mtFileWork t. '' MUTEX [ mtFileWork t. '' MUTEX [ mtFileWork t.
> ''
> >>> MUTEX [ mtFileWork t. '' MUTEX [ mtFileWork t. '' MUTEX
> >>> )
> >>>
> >>> Any help is appreciated!
> >>>
> >>> Thanks,
> >>>
> >>> Devon
> >>>
> >>> On Tue, May 10, 2022 at 4:46 PM Henry Rich <henryhr...@gmail.com>
> wrote:
> >>>
> >>>> If you can get me a version that fails on Windows I'll look at it.
> >>>>
> >>>> Henry Rich
> >>>>
> >>>> On 5/10/2022 4:20 PM, Devon McCormick wrote:
> >>>>> Hi,
> >>>>>
> >>>>> Has anyone had success using the multi-threading mutex primitives?
> >> I've
> >>>>> had limited success - I'll be presenting some basic routines at
> NYCJUG
> >>>> this
> >>>>> evening (18:00 EDT -
> >>>>> https://www.meetup.com/J-Dynamic-Functional-Programming/) - but have
> >>>> been
> >>>>> unable to run multiple threads on a real-life process without
> crashing
> >> J.
> >>>>> The following simplified demo seems to work OK but the version of
> this
> >>>>> where I do actual work crashes - with "Process shell<1> exited
> >> abnormally
> >>>>> with code 5" - after two to thirty repetitions.
> >>>>>
> >>>>> MUTEX=: 10 T. 0 NB. Fast mutex
> >>>>> createThreads=: 3 : '{{ 0 T. '''' }} ^:y]'''''
> >>>>> qts=: 6!:0
> >>>>> createThreads 5
> >>>>> GVAR=: 100?@$1e6 NB. Initialize global
> threads
> >>>> will
> >>>>> consume
> >>>>>
> >>>>> multiLockMsgUnlock=: 3 : 0
> >>>>> while. 0<#GVAR do.
> >>>>> tn=. ":3 T. '' NB. Thread number as char
> >>>>> varnm=: ' '-.~'threadVar',tn
> >>>>> smoutput 'Thread ',tn,' locking at ',":qts''
> >>>>> 11 T. y
> >>>>> smoutput 'Thread ',tn,' locked at ',":qts''
> >>>>> (varnm,' GVAR')=: split GVAR
> >>>>> smoutput 'Thread ',tn,' unlocking at ',(":qts''),' with
> >>>>> ',tn,'=',":".varnm
> >>>>> 13 T. y
> >>>>> smoutput 'Thread ',tn,' unlocked at ',(":qts''),';
> >>>> #GVAR=',":#GVAR
> >>>>> end.
> >>>>> )
> >>>>> NB. Start five processes (one line):
> >>>>> multiLockMsgUnlock t. '' MUTEX [ multiLockMsgUnlock t. '' MUTEX [
> >>>>> multiLockMsgUnlock t. '' MUTEX [ multiLockMsgUnlock t. '' MUTEX [
> >>>>> multiLockMsgUnlock t. '' MUTEX
> >>>>>
> >>>>> The actual work I'm doing is on files, a list of whose names
> >> corresponds
> >>>> to
> >>>>> the GVAR vector above.
> >>>>>
> >>>>> Any suggestions are welcome.
> >>>>>
> >>>>> Cheers,
> >>>>>
> >>>>> Devon
> >>>>>
> >>>> --
> >>>> 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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> >> https://www.avg.com
> >>
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> >>
> >
>
>
> --
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>
--
Devon McCormick, CFA
Quantitative Consultant
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