Hi all:
  First thanks for Dave.Demarle's help.
  I use "mpirun -np 4 ./pvserver" to launch a server with four nodes, 
visualizing a 800*800*300 grid. It seems that each process consume too much 
memory. So I extend the number of nodes from 4 to 8 using "mpirun -np 8 
./pvserver" , but each process on 8 nodes server consume the same memory as 4 
nodes server. The situation of 16 processes(16 nodes) is same as above.
   I thought that with the number of processes' growth, each process on server 
would share less raw data, so the quantity of memory each process consuming 
would decline. It proved that I was wrong. Could someone tell me the reason?
 Thanks for your help:)
 Pan Wang
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