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Re: [Chicken-users] CHICKEN hang / crash / memoize egg
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From: |
Andy Bennett |
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Subject: |
Re: [Chicken-users] CHICKEN hang / crash / memoize egg |
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Date: |
Fri, 1 Apr 2016 15:40:30 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.7.0 |
Hi,
>> I'm running CHICKEN 4.9.0rc1 and I'm trying out the memoize egg.
>>
>> I saw the tail-call-optimized version of the factorial procedure in the
>> memoize documentation at http://api.call-cc.org/doc/memoize and I've
>> been trying to modify it so that it memoizes intermediate results such
>> that, for example, a call to (fact 10) makes a subsequent call to (fact
>> 9) fast.
>>
>> In doing so I've managed to get the interpreter into a loop or crash it
>> entirely.
>>
>
> This looks like a perfectly legitimate crash. The memoize egg doesn’t
> impose a limit on memory usage unless you explicitly tell it so.
I get the same results with '(define memo-fact** (memoize fact** 3))'.
I suspect this is a numbers bug as it still allocates a fair bit of memory.
Regards,
@ndy
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