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difx:files [2015/10/21 10:08]
127.0.0.1 external edit
difx:files [2016/04/26 13:48] (current)
nzobservers [The machine file]
Line 20: Line 20:
   tera09   tera09
   tera10   tera10
 +
 +The MPI processes 2-N+1  (N==#​telescopes) will be datastream processes. ​
 +
 +Say you have host1 and host2. host1 is "​head"​ and all the data is stored there and you have 4 telescopes. You want to run a core process on both nodes.
 +
 +Then the number of mpi processes will be 7  (1+4+2 == fxmanager + 4xdatastream + 2xcore).
 +
 +Use the machines files to get the processes in the right place. This depends a little on your implementation of mpi. From memory the following should work: for my example above. Don't include the comments!
 +
 +    ​host1 ​       # Fxmanager
 +    ​host1 ​       # datastream 1
 +    ​host1 ​       # datastream 2
 +    ​host1
 +    ​host1 ​       # datastream 4
 +    host1        # core
 +    host2        # core
 +
 +Remember that "​espresso"​ and such tools handle this for you.
 +
  
 ===== The threads file ===== ===== The threads file =====
difx/files.txt · Last modified: 2016/04/26 13:48 by nzobservers