Originally posted by: WangFISH

Hi, 
I'm tring to solve a problem with CPLEX, the execution time is so long 
and finally I get a message without results:

There may be further error information in the clone logs.

Implied bound cuts applied:  340
Flow cuts applied:  58
Mixed integer rounding cuts applied:  1465
Zero-half cuts applied:  4
Lift and project cuts applied:  56
Gomory fractional cuts applied:  44
Warning: MIP starts not constructed because of out-of-memory status.

Root node processing (before b&c):
  Real time             =   48.19 sec. (13327.23 ticks)
Parallel b&c, 4 threads:
  Real time             = 7603.99 sec. (1278265.49 ticks)
  Sync time (average)   =  217.19 sec.
  Wait time (average)   =    0.00 sec.
                          ------------
Total (root+branch&cut) = 7652.18 sec. (1291592.71 ticks)
Freeing branch-and-bound tree with 16854 nodes
9000 nodes freed
12000 nodes freed
13000 nodes freed
15000 nodes freed

Someone has an idea what does this mean ?? 

Thank you for help. 

Wang

In this case it means that you have run out of memory. This should also be reflected in the status code. The best solution found so far should be available for queries.

How do you invoke CPLEX? Do you use the interactive optimizer or one of the programming APIs (which one)?

Originally posted by: WangFISH

Dear Daniel:

Thank you very much . I use the IBM ILOG CPLEX  12.6 Optimization studio and all the setting is default. 

May the problem be sovled if I use a better computer?

Wang

Do you mean, you are using the IDE?

A better computer may help but there is no guarantee that you will not run out-of-memory with a better computer as well. To fight out-of-memory, you can find some help here.