Re: langevinTemp and system temperature

From: Axel Kohlmeyer (akohlmey_at_gmail.com)
Date: Fri Jan 29 2010 - 10:01:21 CST

On Fri, Jan 29, 2010 at 10:30 AM, snoze pa <snoze.pa_at_gmail.com> wrote:
> Dear NAMD users,
>
>  I am trying to change the temperature in steps but something strange
> happening as can be seen in following output
> The "Setting parameter langevinTemp to 200" and the temp is 15.6240  !
> Any idea. I will highly appreciate your help.

please first explain why all your output is repeated multiple times.

you provide so little information that it is impossible to deduce what
is going on.

axel.

> WRITING EXTENDED SYSTEM TO RESTART FILE AT STEP 115000
> WRITING COORDINATES TO DCD FILE AT STEP 115000
> WRITING COORDINATES TO RESTART FILE AT STEP 115000
> FINISHED WRITING RESTART COORDINATES
> WRITING VELOCITIES TO RESTART FILE AT STEP 115000
> FINISHED WRITING RESTART VELOCITIES
> TCL: Writing to files with basename heat_P.
> WRITING EXTENDED SYSTEM TO OUTPUT FILE AT STEP 115000
> WRITING COORDINATES TO OUTPUT FILE AT STEP 115000
> WRITING VELOCITIES TO OUTPUT FILE AT STEP 115000
> TCL: Setting parameter langevinTemp to 200
> TCL: Running for 5000 steps
> PRESSURE: 115000 -30091 -192.727 -13.3307 -209.937 -29953.4 33.3876
> -12.6291 7.78817 -29852.5
> GPRESSURE: 115000 -3129.63 -53.486 4.50735 -57.6072 -3156.02 51.9169
> 12.2991 0.849874 -3025.97
> ENERGY:  115000        79.6567       239.8201       419.1070
> 9.3616        -557285.8838     68203.1426         8.8448
> 0.0000      3726.6078        -484599.3432        15.6240
> -488325.9510   -484589.6426        15.6240         -29965.6279
> -3103.8758   1245387.7826    -29965.6279     -3103.8758
>
> Info: Initial time: 4 CPUs 0.25108 s/step 2.90602 days/ns 147.734 MB memory
> Info: Initial time: 4 CPUs 0.25109 s/step 2.90613 days/ns 147.731 MB memory
> Info: Initial time: 4 CPUs 0.250974 s/step 2.90479 days/ns 147.811 MB memory
> Info: Benchmark time: 4 CPUs 0.251096 s/step 2.9062 days/ns 147.812 MB memory
> Info: Benchmark time: 4 CPUs 0.251024 s/step 2.90537 days/ns 147.738 MB memory
> Info: Benchmark time: 4 CPUs 0.250939 s/step 2.90438 days/ns 147.78 MB memory
>
> Also at 300K
>
> WRITING EXTENDED SYSTEM TO RESTART FILE AT STEP 165000
> WRITING COORDINATES TO DCD FILE AT STEP 165000
> WRITING COORDINATES TO RESTART FILE AT STEP 165000
> FINISHED WRITING RESTART COORDINATES
> WRITING VELOCITIES TO RESTART FILE AT STEP 165000
> FINISHED WRITING RESTART VELOCITIES
> TCL: Writing to files with basename heat_P.
> WRITING EXTENDED SYSTEM TO OUTPUT FILE AT STEP 165000
> WRITING COORDINATES TO OUTPUT FILE AT STEP 165000
> WRITING VELOCITIES TO OUTPUT FILE AT STEP 165000
> TCL: Setting parameter langevinTemp to 300
> TCL: Running for 5000 steps
> PRESSURE: 165000 -30080.6 -175.244 -34.9534 -176.999 -29970.7 42.3602
> -34.1171 41.3638 -29833.6
> GPRESSURE: 165000 -3106.28 -49.7584 10.03 -47.0878 -3154.23 60.7936
> -0.837666 62.3958 -3026.63
> ENERGY:  165000        85.7171       246.8998       415.4260
> 9.5578        -557409.3785     68306.4849         8.9140
> 0.0000      3737.1702        -484599.2086        15.6683
> -488336.3788   -484589.4944        15.6683         -29961.6392
> -3095.7110   1245387.7826    -29961.6392     -3095.7110
>
> Info: Initial time: 4 CPUs 0.252959 s/step 2.92777 days/ns 147.785 MB memory
> Info: Initial time: 4 CPUs 0.253001 s/step 2.92826 days/ns 147.799 MB memory
> Info: Initial time: 4 CPUs 0.253004 s/step 2.92829 days/ns 147.836 MB memory
> Info: Benchmark time: 4 CPUs 0.252791 s/step 2.92582 days/ns 147.799 MB memory
> Info: Benchmark time: 4 CPUs 0.252604 s/step 2.92366 days/ns 147.798 MB memory
> Info: Benchmark time: 4 CPUs 0.252828 s/step 2.92625 days/ns 147.837 MB memory
>
>
> Somehow it is setting the langevinTemp to 300 but the temp remain
> 15.6683! which I never observed before.
>
>
> Thank you
>
> S
>
>

-- 
Dr. Axel Kohlmeyer    akohlmey_at_gmail.com
Institute for Computational Molecular Science
College of Science and Technology
Temple University, Philadelphia PA, USA.

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