Regarding significance of days per ns (days/ns) parameter in NAMD benchmark

From: Puneet Singh (singh.punit1990_at_gmail.com)
Date: Tue Oct 20 2015 - 01:01:24 CDT

Dear Sir,
I wish to know that what is meant by the parameter days/ns & how it relates
to namd performance?
i.e.
my benchmark on Intel(R) Xeon(R) E5-2660 v2 ( NAMD V2.10 ApoA1 example -
only cpu - no MIC/GPU):
16 CPUs 0.078224 *s/step* 905.37 *days/ns* 380.207 *MB memory* (42.40
seconds)
 19 CPUs 0.0665057 *s/step* 769.742 *days/ns* 411.355 *MB memory* (36
seconds)
114 CPUs 0.203145* s/step* 2351.21 *days/ns* 1976.23 *MB memory* (91.94
seconds)

Benchmark@https://wiki.anl.gov/cnm/HPC/Applications/namd ( ApoA1 example):
16 CPUs 0.105658 *s/step* 1.2229 *days/ns* 50.3477 *MB memory* (NAMD V2.7)
16 CPUs 0.103924 *s/step* 1.20282 *days/ns* 225.961 *MB memory*(NAMD V2.9)

comparing these i get a sense that with increasing version of NAMD , memory
requirement grows, & maybe s/step (500 nsteps in my case , anl.gov nsteps
=? ) are better on my benchmark,

but i am confused with days/ns , so if anyone can explain the significance
of days/ns it would be very kind of you. Further please mention that the
higher value is better or lower value is better wrt performance ?

Eagerly awaiting your replies,

Regards,
Puneet

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