[Cbc] Stack usage by CbcSolver?

[Kish Shen]

Hi,

I have recently switched my code to calling CbcSolver (via 
CbcMain/CbcMain1) instead of calling Cbc directly. I have noticed that 
calling CbcMain1 seems to use a significant amount of the stack -- I 
found this out when our code was run from within Java on Windows, which 
have quite a small stack size (about 400K), and I got an stack overflow 
error.

I tested to see how much stack is needed on Linux, but using ulimit -s 
to artificially limit the stack size. I found that using the old 
interface of calling Cbc directly, I was able to run with ulimit -s 200, 
i.e. a 200K stack, bur with the new interface, I needed a stack of 1100K 
to avoid stack overflow.

The overflow seem to happen in the call to CbcMain1, even for a very 
simple MIP problem (2 constraints, 2 variables). The ulmit test would
seem to suggest that CbcMain1 needs something like 900K of stack space 
to run. Does anyone know if this is expected, and could this be reduced?

Cheers,

Kish

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