Do firsttimestep, numsteps and run have maximum values?

From: yjcoshc (
Date: Tue Sep 18 2018 - 20:42:05 CDT

Hello everyone,

I am trying to restart a NAMD simulation which has run for 2133000000
steps. If I set:

firsttimestep 2133000000
run 1000000000

and then NAMD would run 0 step and exit. I have looked at the NAMD
source code and found the type of N and firsttimestep is int, not long
long or int64_t. Does that mean the maximum firsttimestep and total
steps is the maximum int type integer (2147483647 in gcc)?


Haochuan Chen

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