test will not be finished when i using 200 client threads

Hello all,

I am trying to test postgresql using YCSB, and when i set client thread as
200, i found it will not be finished.
and log likes

-bash-3.2$ vi postgresql-Sun.log
LOG:  database system was shut down at 2012-10-21 21:32:52 KST
LOG:  database system is ready to accept connections
LOG:  autovacuum launcher started


My key configuration in postgresql.conf


listen_addresses = '*'
max_connections = 400
shared_buffers = 512MB
temp_buffers = 200MB
work_mem = 1GB
maintenance_work_mem = 512MB


do you know why?





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