[Jprogramming] A couple of J805/806 issues

[Henry Rich]

I have found the source of the memory leak & have to verify the fix.

Henry Rich

On 5/19/2017 7:15 PM, Jose Mario Quintana wrote:
> Further testing suggests that the memory leak bug,
>
> ]^:0: (;/i.1e6)
>
> is pervasive in the following sense:
>
> It occurs when the verb argument is a boxed list with several items and for
> most (any?) verbs  u  and  v  in the monadic or dyadic form  u^:v  ; it
> affects J805 and J806, all flavors (JQt, JHS, jconsole), and platforms
> (Windows, Linux, etc.).
>
> Beware: if another verb contains u^:v  and it is executed repeatedly memory
> is consumed and it can potentially freeze a computer; that is what happened
> when I was bitten for the first time (I had to pull the plug).
>
> PS.  The wicked crash also seems to be widespread.
>
>
> On Tue, May 16, 2017 at 7:05 PM, Jose Mario Quintana <
> jose.mario.quintana at gmail.com> wrote:
>
>> Thank you
>>
>> On Tue, May 16, 2017 at 6:48 PM, David Mitchell <davidmitchell at att.net>
>> wrote:
>>
>>> It ran in J64-804
>>>
>>>
>>> On 5/16/2017 18:09, Jose Mario Quintana wrote:
>>>
>>>> 0. Wicked Crash in JQt805/806
>>>>
>>>>      Cloak=. ((5!:1)@:<'Cloak')Cloak=. (0:`)(,^:)
>>>>      'evoke fix amper'=. <@:Cloak "0@:;: '`:  f. &'
>>>>      train=. evoke&6 f.
>>>>      an=. <@:((,'0') ,&< ])
>>>>
>>>>      indet=. '' ($ ,) 128!:5  NB. Is Indeterminate?
>>>>      eval=. {. train@:, an@:((train :: ])&.>)@:}.
>>>>      body=. ([ amper >@:{.)@:([ , <@:])`(eval@:}.@:[)@.(indet @:])
>>>>      GENOME=. <@:fix'body'
>>>>
>>>>      vs=. GENOME&body f.
>>>>      S=. vs ]`''  NB. Strand notation (_. is used as a guard)
>>>>
>>>>      S 'this' 'is' 'strand' 'notation' 0 a: (a.{~97+i.10) _.
>>>> ┌────┬──┬──────┬────────┬─┬──┬──────────┐
>>>> │this│is│strand│notation│0│┌┐│abcdefghij│
>>>> │    │  │      │        │ ││││          │
>>>> │    │  │      │        │ │└┘│          │
>>>> └────┴──┴──────┴────────┴─┴──┴──────────┘
>>>>
>>>>      S (body f.)`'' _. NB. Nothing is produced...
>>>>      S  NB. ... J805/806 Crashes!
>>>>
>>>>      It runs fine in a custom J (Jx804) based on J804.  Can anybody
>>>> confirm
>>>> that it runs in J04 (I do not have one handy)?
>>>>
>>>>      assert (,GENOME) -: S (body f.)`'' _.
>>>>
>>>>      The problem seems to be related to in-place operations; but, I have
>>>> no
>>>> idea if it only can occur in wicked contexts or not.
>>>>
>>>>
>>>> 1. Memory leak in JQt805/806
>>>>
>>>>      This is one hurdle preventing us from moving an application from
>>>> Jx804
>>>> to Jx805/Jx806,
>>>>
>>>>      ]^:0: ;/i.1e6
>>>> ----------------------------------------------------------------------
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>>>>
>>>> ----------------------------------------------------------------------
>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>
>>
> ----------------------------------------------------------------------
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