[yt-users] HaloFinder- parallel is slower?
Agarwal, Shankar
sagarwal at ku.edu
Mon Dec 7 20:54:08 PST 2009
Hi,
I ran yt's HaloFinder routine on 1 processor, and then on 8 processors. Both give identical output : 40,000 halos starting from 512^3 particles.
1 processor : took 1 hour 45 minutes.
8 processors : took 2 hours.
My script is hop_yt.py....
from yt.mods import *
fn = "RedshiftOutput0002"
pf = load(fn)
halos = HaloFinder(pf,40,padding=0.02)
halos.write_out("HopAnalysis.out")
commands I used....
mpirun -np 1 python hop_yt.py --parallel
mpirun -np 8 python hop_yt.py --parallel
Any idea why 8 cpus would take longer ?
shankar
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