RE: long simulation and error "integer value too large"

From: dhirajks (
Date: Sat Apr 21 2018 - 09:04:42 CDT

Thanks for the explanation Josh. I intended to do only 2 micro second simulation and my system is small enough for 100 ns per day simulation.

Sent from my Galaxy Tab® S2
-------- Original message --------From: "Vermaas, Joshua" <> Date: 4/21/18 8:45 AM (GMT-06:00) To:, Subject: RE: namd-l: long simulation and error "integer value too large"

Run 10 simulations that are only a billion steps each. You are running into the limitations of 32 bit integers, which can't represent numbers larger than 2^32 (around 2 billion). Just as a warning, at around a ms per step, this will take you 115 days.




On 2018-04-20 22:31:30-06:00 wrote:

Hi all 
        I am trying to do a really long simulation on NAMD but its showing following error.
how can I fix this problem?


FATAL ERROR: integer value too large to represent as non-long integer
    while executing
"run 10000000000 "

This archive was generated by hypermail 2.1.6 : Tue Dec 31 2019 - 23:19:51 CST