[SCIP] Copy arrays to probdata memory problem

[André Filipe Lanca Serrano]

Dear Gerald,

My problem has around 1.4 million binary variables.

Yes I do that because the variables and constraints arrays are not  
available in the heuristic callback. That heuristic was implemented by  
me.

I get the error code -1. And when I try to duplicate the vars memory I  
get memory access violation errors.

Kind regards,
André Serrano

Quoting Gerald Gamrath <gamrath at zib.de>:

> Dear André,
>
>> I'm dealing with a problem with a huge number of binary variables  
>> and I am having some memory management problems.
> what size does your problem have?
>
>> I was wondering, it is really necessary to copy the variable and  
>> constraint arrays to probdata struct?
> Do you do this? Then, I can't say if it is necessary. SCIP does not  
> fill the probdata struct itself. But of course, SCIP needs to store  
> the variables in its internal data structures.
>
>> When I run my problem I get memory access violation probably  
>> because down there in SCIP, SCIPconsGetNVars copies an array for  
>> which there is no memory available or maybe an available array was  
>> overwritten due to memory insufficiency and thus couldn't be  
>> accessed correctly.
> What error do you get? If there is not enough memory for SCIP to  
> allocate an array, SCIP should stop with an error code and print an  
> error message that insufficient memory was available for allocating  
> x bytes.
>
> I would suggest you compile in debug mode and perhaps also disable  
> buffer and block memory (OPT=dbg NOBLKBUFMEM=true when compiling  
> with make, -DCMAKE_BUILD_TYPE=Debug -DNOBLKBUFMEM=on for CMake) and  
> then run your code with valgrind to find out where something breaks.
>
> Best,
> Gerald