Machine details
CPU	4 core
OS	suse linux 10.3
RAM	24GB
Base records	1000000	record size	1800
update	3	shared buffers	4GB
auto vacuum	off	wal_buffers	16MB
ckpt seg	256	ckpt interval	15min
server_encoding	SQL_ASCII	client_encoding	UTF8
lc_collate	C	lc_ctype	C
sync commit	off	Fill factor	80
Update rec length	250
CONFIGURATION
Clients	1		2		8
WAL Memcmp for UPDATE + XLOG scale code
	TPS	Xlog Diff (GB)	TPS	Xlog Diff (GB)	TPS	Xlog Diff (GB)
Run1	856	2.37	1721	3.31	5509	8.83
Run2	865	2.37	1729	3.31	5514	8.83
Run3	898	2.37	1663	3.25	5506	8.69
Avg	873	2.37	1704.333333	3.29	5509.667	8.78
XLOG Scale code
	TPS	Xlog Diff (GB)	TPS	Xlog Diff (GB)	TPS	Xlog Diff (GB)
Run1	830	4.16	1433	7.21	2729	13.75
Run2	829	4.16	1436	7.23	2676	13.45
Run3	845	4.31	1486	7.44	2700	13.62
Avg	834.6666667	4.21	1451.666667	7.29	2701.667	13.61
DIFF
	4.59%	-43.85%	17.41%	-54.88%	103.94%	-35.47%
CONFIGURATION
Clients	1		2		8
WAL LZ for UPDATE + XLOG scale code
	TPS	Xlog Diff (GB)	TPS	Xlog Diff (GB)	TPS	Xlog Diff (GB)
Run1	640	1.96	1284	2.84	4639	7.36
Run2	698	2.07	1281	2.84	4629	7.32
Run3	641	1.97	1263	2.82	4684	7.39
Avg	659.6666667	2.00	1276	2.83	4650.667	7.36
XLOG Scale code
	TPS	Xlog Diff (GB)	TPS	Xlog Diff (GB)	TPS	Xlog Diff (GB)
Run1	830	4.16	1433	7.21	2729	13.75
Run2	829	4.16	1436	7.23	2676	13.45
Run3	845	4.31	1486	7.44	2700	13.62
Avg	834.6666667	4.21	1451.666667	7.29	2701.667	13.61
DIFF
	-20.97%	-52.53%	-12.10%	-61.14%	72.14%	-45.94%