2009.10.12

Comparing vos create process time by setting process max row and buffer size
==============================================================================

						is it disk or algorithm ?

- file input size : 257,985,910 byte (~ 250 MB)
- format of input field:

	'\'':field01:'\''::';',

- format of output field:

	'':field01:''::'|',

- number of field in input & output : 11 field
- process max : 2 (this option does not effect process actually)


system copy time
==============================================================================

	real    0m2.906s
	user    0m0.010s
	sys     0m0.747s


vos load+create
==============================================================================

test 000
--------
o process max row	: 100,000
o file buffer size	: 8192

	real    0m30.243s
	user    0m55.680s
	sys     0m1.567s


test 001
--------
o process max row	: 100,000
o file buffer size	: 1,024,000

	real    0m30.296s
	user    0m55.536s
	sys     0m1.790s


test 002
--------

o process max row	: 200,000
o file buffer size	: 1,024,000

	real    0m30.115s
	user    0m55.956s
	sys     0m1.500s


test 003
--------

o process max row	: 100,000
o file buffer size	: 51,200,000

	real    0m29.924s
	user    0m55.443s
	sys     0m1.563s


test 004
--------

o process max row	: 500,000
o file buffer size	: 51,200,000

	real    0m32.795s
	user    0m57.013s
	sys     0m1.697s


(source change)
before:
- int record_read_filtered(struct Record **R, struct File *F,
				struct Field *fld);
after:
- int record_read_filtered(struct Record **R, struct File *F,
				struct Field *fld, struct String *str);


test 005
--------

o process max row	: 100,000
o file buffer size	: 8,192

	real    0m29.783s
	user    0m54.253s
	sys     0m1.867s


test 006
--------

o process max row	: 100,000
o file buffer size	: 51,200,000

	real    0m30.364s
	user    0m56.000s
	sys     0m1.570s