[gambit-list] problem with load.

Marc Feeley feeley at iro.umontreal.ca
Wed Jun 20 09:44:14 EDT 2007

On 20-Jun-07, at 9:12 AM, |/|/ Bendick wrote:

> Speaking of heaps I can't get gambit to let me (make-vector 10000000)
> with any heap size...
> % unlimit
> % gsi -:h4000000
> Gambit Version 4.0 beta 22
>> (make-vector 10000000)
> *** ERROR IN ##make-vector -- Heap overflow
> 1>
> Any ideas?

In memory, objects are encoded as a sequence of machine words.  The  
first machine word is the header.  It encodes some GC information and  
the object's type (in the lower 8 bits of the word) and it uses the  
remaining bits (24 on a 32 bit machine, or 56 on a 64 bit machine) to  
encode the length of the object in bytes.

This means that on a 32 bit machine the largest vector is just shy of  
2^24 bytes, or 2^22 words, i.e. roughly 4 million elements.  On a 64  
bit machine the virtual memory is the only limit.


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