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See how much memory is on your system by using the free command.

# free
             total       used       free     shared    buffers     cached
Mem:        524492     499600      24892          0      23376     104068
-/+ buffers/cache:     372156     152336
Swap:       262136      45824     216312
Keep a close eye on the Swap Used number, if it grows too high you may need more memory on your linux box or reduce the number of processes running.