IBM 000-8697 Bedienungsanleitung PDF herunterladen (Seite 323)

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101

Operating OnLine 3-67

Monitor Buffers

tbstat -B

Execute tbstat -B to obtain the following buffer statistics:

■ Address of every regular shared-memory buffer

■ Page numbers for all pages remaining in shared memory

■ Address of the ﬁrst user process waiting for each buffer

Refer to page 7-84 for further information about the tbstat -B output.

tbstat -p

Execute tbstat -p to obtain statistics about cached reads and writes. The

caching statistics appear in four ﬁelds on the top row of the output display.

The ﬁrst pair of statistics appears in the third and fourth positions:

The second pair of statistics appears in the seventh and eighth positions of

the top row of the display:

Note that the number of reads or writes can appear as a negative number if

the number of occurrences exceeds 2

. To reset the proﬁle counts, execute

tbstat -z.

Refer to page 7-92 for further information about the tbstat -p output.

Execute tbstat -P to obtain the tbstat -p display, with an additional ﬁeld,

BIGreads, the number of big-buffer reads. Refer to page 2-55 for further

information about the big buffers.

bufreads

is the number of reads from shared-memory buffers.

%cached is the percentage of reads cached.

bufwrits

is the number of writes to shared memory.

%cached

is the percentage of writes cached.

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