我试图通过使用 OPL 将其编写为线性程序并使用 CPLEX Studio 来解决网络流问题。CPLEX Studio 花了 26 分钟才解决了这个问题。但是，Engine Log说Network time = 0.21 sec：
CPXPARAM_LPMethod 3
Tried aggregator 1 time.
LP Presolve eliminated 914361 rows and 916674 columns.
Aggregator did 5 substitutions.
Reduced LP has 4629 rows, 457853 columns, and 913392 nonzeros.
Presolve time = 1.28 sec. (955.67 ticks)
Extracted network with 4630 nodes and 457853 arcs.
Extraction time = 0.04 sec. (22.54 ticks)
Iteration log . . .
Iteration: 0 Infeasibility = 3444.000000 (-1.21856e+06)
...
Iteration: 50000 Objective = -1158876.510000
Network - Optimal: Objective = -1.1643204900e+06
Network time = 0.21 sec. (53.14 ticks) Iterations = 54799 (15500)
我不完全确定我是否正确阅读了日志。
这是否意味着解析(或其他开销(需要 26 分钟来消除行/列等，而实际的网络求解只需要 0.2 秒？
如果是这样，绕过分辨率会更快吗？(如有必要，如何绕过预解决？
您应该查看探查器选项卡，以了解时间花在哪里。
技术：http://www-01.ibm.com/support/docview.wss?uid=swg21401402
OPL CPLEX 论坛：https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000002053