[gecode-users] Controlling memory use

[Malcolm Ryan]

In general, the memory use in my search problem seems to be quite a  
lot larger than I expected. I have a system with about 250 IntVars. I  
did a search and found a solution with the following statistics:

Clones: 23
Commits: 178
Fails: 0
Propagates: 276937
Memory: 62.4 Mb (65477136 bytes)

That seems like an awfully large amount of memory for a relatively  
small problem. How do I work out what is causing this? In general,  
what are the factors that contribute towards memory usage and how do I  
control them?

Malcolm

On 30/03/2008, at 4:53 PM, Malcolm Ryan wrote:
> My searches in Gecode/J are crashing when with messages like:
>
> java(221,0xb0801000) malloc: *** mmap(size=65536) failed (error  
> code=12)
> *** error: can't allocate region
> *** set a breakpoint in malloc_error_break to debug
> terminate called after throwing an instance of  
> 'Gecode::MemoryExhausted'
>   what():  Memory: Heap memory exhausted
>
> Is there any way to avoid these, or at least to make the search fail
> more gracefully?
>
> Malcolm
>
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