T — Define time limit for calculation.
The “t=” options determine how long a calculation is allowed to proceed. If the next cycle of the calculation cannot be completed without exceeding the assigned time, the calculation will write restart files and stop. (The safety margin is 100 percent, so enough time to do at least two full cycles must remain.) This is usually important when the calculation is being run on a batch queue system. Several different options are available to set the allotted time. If “t=” is not specified, it will behave using the “t=auto” option.
The total CPU time allowed for the current job is limited to nnn seconds. The value of nnn is assumed to be given in seconds but other time units can be specified by adding the appropriate letter after the number. Seconds is specified by an “s”, minutes by an “m”, hours by an “h”, and days by a “d”. So, for example, “t=3600”, “t=3600s”, “t=60m”, and “t=1h” all specify one hour.
This option determines an appropriate default time limit automatically. Generally, one hour is taken as the default time allowed but for certain compound jobs (CHN and simulated annealing methods) and certain optimizations (TRUSTE and TRUSTG) a larger value may be chosen internally by AMPAC.
The calculation is allowed to proceed with no limit on time. (Note: not specifying a “t=” option will still enforce a time limit.)
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