The MAXIMUM TASKS and MAXIMUM ERUS parameters specify the maximum number of user tasks (online tasks) and external request units that can be active concurrently. The size of these parameters can affect the amount of time spent by DC/UCF in searching the queues for tasks that are waiting to be executed.
Considerations
The number of online tasks and external request units that should be specified is a site-specific determination and is dependent upon factors such as the number of tasks processed each hour in a particular environment. When setting the MAXIMUM TASKS and MAXIMUM ERUS parameters on the SYSTEM statement, the following statistics should be considered:
|
Resource |
Size of resource |
Total |
|---|---|---|
|
TCE |
248 bytes |
248 bytes |
|
STACKSIZE |
320 words |
1,280 bytes |
|
DCE |
40 bytes |
40 bytes |
|
ECB * 3 |
8 bytes |
24 bytes |
|
DPE * 20 |
16 bytes |
320 bytes |
|
RCE * 15 |
16 bytes |
240 bytes |
|
RLE * 25 |
8 bytes |
200 bytes |
|
Total increase per task |
|
2,352 bytes |
Note that a value larger than the default (420) should be specified for the STACKSIZE when using CA ADS. If the STACKSIZE is at 420 and two tasks exceed stacksize and go into abend storage at the same time, the system will abort with an abend code of 3995.
|
Parameter |
Amount increased |
|---|---|
|
ECB LIST |
3 |
|
DPE COUNT |
20 |
|
RCE COUNT |
15 |
|
RLE COUNT |
25 |
|
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