about my hardware gmx has to say:
  Hardware topology: Basic
    Sockets, cores, and logical processors:
      Socket  0: [   0   6] [   1   7] [   2   8] [   3   9] [   4  10] [   5  

if i want to run two gmx jobs simultaneously on this one node,i usually do 
something like:
promt> gmx mdrun -deffnm name1 -nt 6 -pin on -ntmpi 1 -ntomp 6 > er1 2>&1 &
promt> gmx mdrun -deffnm name2 -nt 6 -pin on -ntmpi 1 -ntomp 6 > er2 2>&1 &

given the above numbers what are the best choices for: pinoffset and 
pinstride?i might be too dumb, but what the doc and the gmx webpage say about 
these options is not clear to me ..
if i let gmx decide it does not necessarily seem to make the best choice in 
termsof the resulting performance, which is not surprising as neither of the 
two jobs knowsabout the presence of the other one...


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