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FreeBSD 6.3-RELEASE - PostgreSQL 8.3.0
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sysbench --test=oltp --oltp-read-only=yes --num-threads=1

run 1: 228.18
run 2: 229.09
run 3: 228.34

sysbench --test=oltp --oltp-read-only=yes --num-threads=2

run 1: 382.16
run 2: 379.09
run 3: 383.94

sysbench --test=oltp --oltp-read-only=yes --num-threads=3

run 1: 487.03
run 2: 490.03
run 3: 486.85

sysbench --test=oltp --oltp-read-only=yes --num-threads=4

run 1: 495.66
run 2: 496.82
run 3: 503.47