buf-map Command

For Windows: Not Supported

The buf-map BASIC program displays a visual map of the file system, indicating which frames are currently being held in the RAM buffer area, and updates the display every few seconds.

The buffer map is laid out as a grid of frame addresses for the entire system (bottom left-hand corner is minfid and top right-hand corner is maxfid), and displays which FIDs are currently active in the buffers.

The buffer displays a number between 0 through 7, which indicates the buffer’s state. The values are shown in the upper right-hand corner as a reminder.

Syntax

buf-map {minfid-maxfid} {(options)}

Parameter(s)

minfid	Lowest FID number to be included in the result.
maxfid	Highest FID number to be included in the result.
options	s	Samples about 10% of the memory, rather than reading all buffers in memory. This option provides a quick snapshot of the memory usage, but is less accurate.

Example(s)

buf-map
1-358398. fid loaded : 8740. 8742 buffers. Type H for help.
- - - - - - - - - - - - - - - - - - - - - - -
1	:		5	:	R					2265
2	:	W	6	:	RW
3	:	B	7	:	RB				6
4	:	BW	8	:	RCW				6
- - - - - - - - - - - - - - - - - - - -									6	1700
5									5
5									5
5									5
5									5
5	- - - - - - - - - - - - - - - - - -								5	1135
5
5
5
5
5	- - - - - - - - - - - - - - - - - -								5	-570
5									56
5							1	5	56
5							11	5	16
1						5	5111		15
+- - - -+- - - -+ - - - -+ - - - - +- - - -+- - - - +
Range 1 to 358398. Press X to stop.. 0000

The diagram above displays the different states of the buffers in memory by a number displayed in the state table below.

With the s option, only a sample is taken.

Refer’cd	Batch	Write-req	State
0	0	0	1	Available
0	0	1	2
0	1	0	3	Available
0	1	1	4
1	0	0	5
1	0	1	6
1	1	0	7
1	1	1	8

During the sampling, enter one of these options:

h	Displays this screen.
s	Stops sampling and display results.
x	Exits the process.