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SET DEFAULT BIGBUF Command
The SET DEFAULT BIGBUF command sets the disk buffer size for the
job. Disk I/O can be improved by increasing the disk buffer
size, but buffers increase the size of the job.
With the SET DEFAULT BIGBUF command, each added block gives you
200 octal words of disk buffer. For example, SET DEFAULT BIGBUF
5 sets the buffer size to 5 blocks (1200 octal words). SET
DEFAULT BIGBUF 0 defaults the buffer size to one block. The
maximum value for SET DEFAULT BIGBUF is 31. When big buffers are
in use, TOPS-10 defaults to a value of four blocks (1000 octal
Because the SET DEFAULT BIGBUF command sets the buffer size for
the job, the buffer size will remain the same until the user logs
out, or changes it by using the command again.
In order to use big buffers, the program that is
doing disk I/O must be written to utilize the
buffer size. Otherwise, this command has no
effect on your job except to increase job size.
SET DEFAULT BIGBUF n
Where: n is 0 through 31 decimal. This value indicates the
number of blocks (200 octal words) per buffer.
Leaves your terminal at monitor level.
Does not destroy your core image.
Set the disk buffer size to 5 blocks.
.SET DEFAULT BIGBUF 5<RET>