[Chimera-users] gopenmol files in chimera?

Thomas Goddard goddard at cgl.ucsf.edu
Mon Jul 25 16:17:42 PDT 2005

Hi Grant,

  We don't have the common high-end consumer desktop graphics cards
from the past year in our lab right now.  We either have consumer
cards more than a year old (Radeon 9800 Pro, GeForce 4 Ti vintage) or
workstation cards that are rare (Quadro FX 3400, FireGL X1).  This is
basically what you'll see on our volume data Chimera rendering
benchmarks web page.


  In terms of handling large systems, say 50000+ atoms, Chimera is
slow doing many simple manipulations: selecting, coloring, changing
display style.  This is because Chimera loops over the atoms in Python
code instead of a compiled language like C++, C, or Fortran.  Working
with large models involves alot of these simple actions and I find
that to be the main performance problem using Chimera on large models.
Other molecular graphics programs are faster.  With Chimera a fast CPU
(rather than GPU) can ameliorate this.  A dual CPU system will help by
allowing other task (like X windows) run.  Chimera can only use one


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