cluster performance
Dear all,
i'm new to this community. i hope u all can help me about beowulf cluster,
for your information, i already have mini cluster consist of one server
(single xeon cpu) and 8 nodes ( every nodes have 1 p4 cpu).. everything
works fined except the connection.. i've seen that my job running only at
50%++ of the cpu power on every nodes.. how can i improve my cluster? i've
read that they ask to incread the P4_SOCKBUFSIZE but i dont actually
understand how to do it.... below is the steps... i already did the first
step but for the second one i havent do it yet... i dont know.. i'm using
bash... can any body help me how to do the second step in bash??? what is
the command actually.. i know this is the stupid question but sorry... i'm
new to linux.. i hope someone can help me... i hope this thing will work for
me to increase my cluster performance....
1) At the OS level, you need to zap a couple of values that determine the
upper limit allowed for socket buffers. This is, in my opinion, best done by
adding the following two lines to the system file /etc/rc.d/rc.local (as
root, of course), and rebooting:
echo 1048576 > /proc/sys/net/core/rmem_max
echo 1048576 > /proc/sys/net/core/wmem_max
This sets the upper limit on socket buffers to 1 MB.
2) At the level of mpi, you need to make the following entry in your .cshrc
(or the equivalent commands in .bashrc, if you bash):
setenv P4_SOCKBUFSIZE 524288
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