[CHiPPS] Problems about the search log

[Yan Xu]

*         CPU time - the time actually spent by CPU executing method code
*         Wall time - the real-world time elapsed between method entry and method exit. If there are other threads/processes concurrently running on the system, they can affect the results.

CPU time is the total execution time or runtime for which the CPU was dedicated to a process. It is possible that the CPU that master process was on had other processes that used many CPU cycles.

From: chipps-bounces at list.coin-or.org [mailto:chipps-bounces at list.coin-or.org] On Behalf Of ???
Sent: Thursday, January 12, 2012 2:44 AM
To: chipps at list.coin-or.org
Subject: [CHiPPS] Problems about the search log

Dear Professors,
I have some troubles about the search log generated after the problem is solved.
First, I would like to know the difference between wallclock and CPU time.

Second, there is these lines in the log file:

Search CPU time (master) = 3.51222 seconds
Max CPU time (worker) = 5.32033
Min CPU time (worker) = 3.50822
Search wallclock time (master) = 6.65905 seconds
Max wallclock (worker) = 6.65418
Min wallclock (worker) = 6.65133

Could you tell me the duration of master`s CPU time and wallclock?
Is  it the duration from the beginning to the end of the tree search?
And why the master`s CPU time is shorter than the Max CPU time of worker?
While the master`s wallclock is longer than the Max wallclock time of worker?


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