Originally posted by: MJB-5011

WE are experiencing the following problem. When we use reslim=2000 the mip problem runs until 1900 seconds with a 31% gap and then jumps quickly to a 0.8% gap. When we increase reslim to 3000 then it runs at a 31% gap until 2900 seconds and then it fins a similar gap of 0.8%. Finally when reslim is reduced to 1000 it runs until 950 sec at 31% gap and then suddenly gives a 0.8% gap. Similar thing happens when reslim =100 . Why this behavior?
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Originally posted by: John Cui

I never hear reslim from cplex, so could you please tell us:
1. which programming langange are you using? c/c++/java/...
2. where do you find reslim from cplex document or other place?

John Cui
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Originally posted by: Erwin_Kalvelagen

Reslim means "time limit" in GAMS. I suggest you attach some log files so we can see what is happening.

Erwin
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Originally posted by: MJB-5011

Here is the log file with reslim=100
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Originally posted by: MJB-5011

Here is the file with reslim=1000
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Originally posted by: MJB-5011

Log file with reslim=1000
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Originally posted by: SystemAdmin

The answer to this is an implementational detail: when you use time limits, the solving process becomes non-deterministic close to the end of the time limit.

Tobias
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