DPLT

Type

OMEGAMON Minor command

Description

Plots tape device activity every nn milliseconds. (There are other entries with the same name. See the previous entry for a description of DPLT as a minor of disk majors.)

DPLTnn

DPLT allows inspection of processes that occur between OMEGAMON cycles. For any given major device command, DPLT takes 50 samples every nn milliseconds. DPLT only plots the first device which the major specifies. Each sample indicates changes in device status and user.

To report on the I/O# subfield properly, DPLT requires RMF to be monitoring the device.

The following screen display shows the DPLT minor command used with the DEV major.

Figure 1. DPLT minor command used with the DEV major

 DEV 522 Online
 DPLT02 ________ OMEGAMON Peek at unit=522 volser=...... _______
+      |DBsy                                                    | Samples:   50
+      |CBsy                                                    | Interval:   6
+      |Chan                                                    | I/O’s:
+      |IOQ   11111111111111111111111111111111111111111111111111|
+      |I/O#                                                    |
+      |CPU                                                     |
+      |User                                                    |
+      |Cyl                                                     |
+      |Nrdy  NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN|
+      |Resv                                                    |

The following fields appear on the display:

DBsy

D indicates device busy.S indicates suspended channel program.

IOQ

Length of IOQ. A value greater than 9 but less than 36 is given by a letter of the alphabet, where A=10, B=11, and so on. A value greater than 35 is given by a plus (+) sign.

I/O#

Wrap-around I/O#.

CPU

Can be one of these symbols:

|: CPU dispatchable. This character indicates that the address space has at least one TCB ready to be dispatched.
.: Waiting. This character indicates that no TCBs are ready to execute.

User

Current user.

Cyl

Cylinder address. Rls in this field indicates that a standalone release is in progress, and, therefore, no cylinder is involved.

Nrdy

Not ready.

Resv

Device reserved this CPU.

Related Information

Minor of: See Tape information commands in Command groupings.