Machine details							Base records	1000000	fill factor	100
CPU	8 core						update	3	shared buffers	2GB
OS	suse linux 10.3						record size	1800	update size	250
RAM	24GB						threads	8	clients	16
							auto vacuum	off	wal page size	1K
							ckpt seg	256	ckpt interval	15min
							sync commit	off
Fixed string
fill factor	100
pgbench	old code		Modified code		Difference(%)		LZ code		Difference(%)
	TPS	Total	TPS	Total	TPS	Total	TPS	Total	TPS	Total
Run1	912	549078	1493	896713	63.70614	63.3125	1457	875289	59.75877193	59.41068
Run2	947	569253	1536	925954	62.19641	62.66124	1362	819956	43.82259768	44.0407
Run3	1023	615215	1533	922978	49.85337	50.02528	1326	796615	29.61876833	29.48563
Avg	960.6667	577848.7	1520.667	915215	58.58531	58.66634	1381.666667	830620	44.40004598	44.31234
fill factor	80
pgbench	old code		Modified code		Difference(%)		LZ code		Difference(%)
	TPS	Total	TPS	Total	TPS	Total	TPS	Total	TPS	Total
Run1	1247	750005	2730	1646096	118.9254	119.478	3373	2028472	170.489174	170.4611
Run2	1373	825262	2860	1720464	108.303	108.4749	2677	1612746	94.97450838	95.4223
Run3	1564	939670	2993	1799345	91.36829	91.4869	3155	1893968	101.7263427	101.5567
Avg	1394.667	838312.3	2861	1721968	106.1989	106.4799	3068.333333	1845062	122.396675	122.48