Linux Ubuntu 64 bits
gcc 64 bits

pgbench -U postgres -i -p 5432 -d postgres


patched v7:
/usr/local/pgsql/bin/pgbench -M prepared -c 10 -T 60 -S -n -U postgres -d postgres
transaction type: <builtin: select only>
scaling factor: 1
query mode: prepared
number of clients: 10
number of threads: 1
maximum number of tries: 1
duration: 60 s
number of transactions actually processed: 1106867
number of failed transactions: 0 (0.000%)
latency average = 0.542 ms
initial connection time = 16.517 ms
tps = 18452.786191 (without initial connection time)


/usr/local/pgsql/bin/pgbench -M prepared -c 50 -T 60 -S -n -U postgres -d postgres
transaction type: <builtin: select only>
scaling factor: 1
query mode: prepared
number of clients: 50
number of threads: 1
maximum number of tries: 1
duration: 60 s
number of transactions actually processed: 1047478
number of failed transactions: 0 (0.000%)
latency average = 2.860 ms
initial connection time = 81.995 ms
tps = 17481.067898 (without initial connection time)


/usr/local/pgsql/bin/pgbench -M prepared -c 100 -T 60 -S -n -U postgres -d postgres
transaction type: <builtin: select only>
scaling factor: 1
query mode: prepared
number of clients: 100
number of threads: 1
maximum number of tries: 1
duration: 60 s
number of transactions actually processed: 1018827
number of failed transactions: 0 (0.000%)
latency average = 5.875 ms
initial connection time = 156.956 ms
tps = 17020.459142 (without initial connection time)



head:

/usr/local/pgsql/bin/pgbench -M prepared -c 10 -T 60 -S -n -U postgres -d postgres
transaction type: <builtin: select only>
scaling factor: 1
query mode: prepared
number of clients: 10
number of threads: 1
maximum number of tries: 1
duration: 60 s
number of transactions actually processed: 1096969
number of failed transactions: 0 (0.000%)
latency average = 0.547 ms
initial connection time = 16.791 ms
tps = 18287.865642 (without initial connection time)


/usr/local/pgsql/bin/pgbench -M prepared -c 50 -T 60 -S -n -U postgres -d postgres
transaction type: <builtin: select only>
scaling factor: 1
query mode: prepared
number of clients: 50
number of threads: 1
maximum number of tries: 1
duration: 60 s
number of transactions actually processed: 1030486
number of failed transactions: 0 (0.000%)
latency average = 2.907 ms
initial connection time = 80.533 ms
tps = 17197.568349 (without initial connection time)


/usr/local/pgsql/bin/pgbench -M prepared -c 100 -T 60 -S -n -U postgres -d postgres
transaction type: <builtin: select only>
scaling factor: 1
query mode: prepared
number of clients: 100
number of threads: 1
maximum number of tries: 1
duration: 60 s
number of transactions actually processed: 993385
number of failed transactions: 0 (0.000%)
latency average = 6.024 ms
initial connection time = 157.635 ms
tps = 16599.447414 (without initial connection time)