Question

在使用时间序列数据以动态模式（m.options.imode = 4）模拟具有50个串联CSTR的化学反应器时，出现以下错误。稳态运行就好。而且，动态模拟似乎可以用于具有15个CSTR的简单模型。

是否有解决此问题的方法？

MUMPS returned INFO(1) =-13 - out of memory when trying to allocate 219104583 bytes.
In some cases it helps to decrease the value of the option "mumps_mem_percent".
WARNING: Problem in step computation; switching to emergency mode.
   1r0.0000000e+000 2.87e+001 9.99e+002   1.5 0.00e+000    -  0.00e+000 0.00e+000R  1
MUMPS returned INFO(1) =-13 - out of memory when trying to allocate 219104583 bytes.
In some cases it helps to decrease the value of the option "mumps_mem_percent".
WARNING: Problem in step computation; switching to emergency mode.
Restoration phase is called at point that is almost feasible,
  with constraint violation 0.000000e+000. Abort.
Restoration phase in the restoration phase failed.

Number of Iterations....: 1

                                   (scaled)                 (unscaled)
Objective...............:  0.0000000000000000e+000   0.0000000000000000e+000
Dual infeasibility......:  0.0000000000000000e+000   0.0000000000000000e+000
Constraint violation....:  2.8680600237259355e+001   2.8680600237259355e+001
Complementarity.........:  0.0000000000000000e+000   0.0000000000000000e+000
Overall NLP error.......:  2.8680600237259355e+001   2.8680600237259355e+001


Number of objective function evaluations             = 2
Number of objective gradient evaluations             = 2
Number of equality constraint evaluations            = 2
Number of inequality constraint evaluations          = 0
Number of equality constraint Jacobian evaluations   = 2
Number of inequality constraint Jacobian evaluations = 0
Number of Lagrangian Hessian evaluations             = 2
Total CPU secs in IPOPT (w/o function evaluations)   =      1.672
Total CPU secs in NLP function evaluations           =      4.237

EXIT: Restoration Failed!

 An error occured.
 The error code is  -2

Answer 1

如果同时模式（IMODE=4）太大并且用完了内存，那么我建议您尝试使用（IMODE=7）进行连续模式。

from gekko import GEKKO
m = GEKKO(remote=False)
m.options.IMODE=7

# Your model

m.solve(disp=False)

切换到IMODE=7时的其他一些技巧：

使用remote=False在计算机上而不是公共服务器上进行解决
使用disp=False不显示求解器输出。打印语句会降低代码速度。

IMODE=4和IMODE=7应该给出相同的结果，但是它们是不同的解决方法。在collocation material的Dynamic Optimization course中查看同时模式。

由于内存不足找不到GEKKO（IPOPT）解决方案？

1 个答案: