Job degradation display commands

Use these commands to display degradation data for address spaces.

MONJnn
Displays plot for DEXAN slot number nn or jobname (after first execution).
Type:
Minor of DEX

Executing MONJ a second time results in the following plot:


 MONJ01 JOB1                     %  |0   1   2   3   4   5   6   7   8   9   0|
+ Using CPU                     5.6 |--> .   .   .   .   .   .   .   .   .   .|
+ Waiting for CPU              33.0 |------------->  .   .   .   .   .   .   .|
+ Private Page-in Wait         20.4 |-------->   .   .   .   .   .   .   .   .|
+ Control Unit   25X Queued    15.0 |------> .   .   .   .   .   .   .   .   .|
+ Disk  MVS307   735 Active    14.9 |------> .   .   .   .   .   .   .   .   .|
Note: You may have noticed that the individual wait states shown in this display do not add up to 100%. By default, DEXAN excludes from the display wait reasons that account for less than 5% of the total wait time. You can use the THRS command to adjust this threshold. The MONJ command is also described under Job analysis control commands, because this command can control data collection and display data.
PLTAnn
Displays a plot of job degradation analysis data for DEXAN slot number nn.
Type:
Minor of DEX
PLTJnn
Displays a plot of job degradation analysis data for DEXAN slot number nn, jobname, or ASID.
Type:
Minor of DEX

To display a plot of the most significant wait reasons affecting a job, use the PLTA, PLTJ, or MONJ command.

A sample use of the MONJ command appears earlier in this section. Following is an example of the PLTA and PLTJ command. For example:


 PLTJ02
=======
 PLTJ T010HP32
=======
 PLTA05

In this example, both the DEXAN slot number and jobname were used.


 PLTJ02 T063D  ASID=279          %  |0   1   2   3   4   5   6   7   8   9   0|
+ Using CPU                     5.0 |--> .   .   .   .   .   .   .   .   .   .|
+ Disk  TSO001   253 Queued    30.0 |------------>   .   .   .   .   .   .   .|
+ Private Page-in Wait         20.0 |-------->   .   .   .   .   .   .   .   .|
+ Control Unit   25X Queued    15.0 |------> .   .   .   .   .   .   .   .   .|
+ Disk  MVS307   735 Active    15.0 |------> .   .   .   .   .   .   .   .   .|
+ Waiting for CPU               5.0 |--> .   .   .   .   .   .   .   .   .   .|
===============================================================================
 PLTJ03 T010HP32 ASID=332        %  |0   1   2   3   4   5   6   7   8   9   0|
+ Using CPU                    24.5 |--------->  .   .   .   .   .   .   .   .|
+ Disk  MVWK56   137 Queued    62.1 |------------============>>  .   .   .   .|
+ Waiting for CPU               5.2 |--> .   .   .   .   .   .   .   .   .   .|
===============================================================================
 PLTA05 SCJ05FL  ASID=472        %  |0   1   2   3   4   5   6   7   8   9   0|
+ Using CPU                     5.1 |--> .   .   .   .   .   .   .   .   .   .|
+ Tape Mount Pending           48.8 |------------=======>.   .   .   .   .   .|
+ Swapped: Det-Wait            25.4 |----------> .   .   .   .   .   .   .   .|
+ Logical Channel 14 Queued     7.2 |--> .   .   .   .   .   .   .   .   .   .|
+ Tape  010259   A99 Active     6.4 |--> .   .   .   .   .   .   .   .   .   .|

Using CPU, which is a productive state, always appears first on a plot.

In this example, both job T063D and T010HP32 suffer from severe degradation because of disk I/O contention. Job SCJ05FL waits for almost half of its time on Tape Mounts Pending.

PCTAnn
Displays wait reasons by percentage for job nn.
Type:
Minor of DEX

Use the PCTA command with the DEXAN slot number to display a percentage listing of wait reasons.

PCTJnn
Displays wait reasons by percentage for job nn or jobname.
Type:
Minor of DEX

Use PCTJ command to display the wait reasons for a job (address space).

For example:


PCTJ OMEGAMON
PCTA5

results in:


 PCTJ02     CPU  STI
+ OMEGAMON  0.4 99.6
 PCTA05     CPU  PAG  UNI  CPW  4A3  4A0  A9A  4A4  157 Q4A4  140
+ PRMS40BW  9.8 28.2 21.7 18.4  9.0  7.9  5.8  4.6  2.1  1.9   .6

This display shows two address spaces: OMEGAMON and PRMS40BW. OMEGAMON shows only STI waits, but PRMS40BW shows degradation due to paging, unilateral swaps, waiting for CPU cycles, and I/O contention.

The first row of the percentage display lists execution states where a workload spends time. The numbers in the second row are the percentage of time that a workload spends in an address space. For a listing of all possible execution states, see Figure 1. For more information on execution states, see Execution state summary.

Only 14 execution states can be displayed at one time. To scroll horizontally to see any additional wait reasons, type 1 in column 1 next to the command to move to the second screen. Type 2 in column 1 to move to the third screen, and so on. To return to the first screen, enter 0 or blank in column 1. Likewise, type 1 in column 1 next to the command to return to the second screen from any screen.

CNTAnn
Displays counts of wait reasons for DEXAN slot number nn.
Type:
Minor of DEX
CNTJnn
Displays counts of wait reasons for DEXAN slot number nn jobname, or ASID.
Type:
Minor of DEX

For example:


CNTJ USERPSP

results in:


 CNTJ01     CPU  PAG  UNI  CPW  4A3  4A0  A9A  4A4 QA9A  157 Q4A0 140
+ USERPSP   ---  307  236  206   98   86   71   50   35   23   21  10

The counts show you the actual results of DEXAN sampling or data collection. Each column heading is an execution state where a job is spending time. The numbers are the actual number of times DEXAN found a job in a particular execution state.

No counts appear for CPU because using CPU is determined by an alternate method. For a complete list of all possible execution states, see Figure 1. For more information about execution states, see Execution state summary. These counts are the raw data from which the resource impact profile, plot, and percentage are drawn. These three displays are what you will rely on most of the time because they are easier to interpret than a count. However, it is good to become familiar with counts because they can help you become familiar with your system and with DEXAN. Also, if you know where the displays come from, they will be even easier to use.

The CNTJ command cannot be used with the IPRO command.