The table describes the Control‑O components that use ECSA.
Table 185 ECSA Usage (Above the 16 MB Line)
Component  | 
Size  | 
Description  | 
|---|---|---|
Subsystem executor  | 
250 K  | 
  | 
Wait elements  | 
160 K  | 
By default, the Control-O monitor allocates 20 wait elements of 8 K each, in internal control blocks called PNDs. The number of allocated PND buffers can be overridden with the WAITPR# parameter of the Control statement in CTOPARM. For further information on the PND# parameter see the INCONTROL for z/OS Installation Guide: Installing and NCONTROL for z/OS Installation Guide: Customizing.  | 
Work Buffers  | 
480 K  | 
By default, the Control-O monitor allocates 20 work buffers of 24 K each, in internal control blocks called WSCs. The number of allocated WSC buffers can be overridden with the WSC# parameter of the Control statement in CTOPARM. For further information on the WSC# parameter see the NCONTROL for z/OS Installation Guide: Installing and NCONTROL for z/OS Installation Guide: Customizing.  | 
Rules  | 
50 K  | 
This amount assumes 500 rules and an average of 100 bytes per rule.  | 
XES preallocated buffers  | 
3000 K  | 
Preallocated buffers for XES operations. (The value of 3000K is appropriate for a system with 4 CPUs. The approximate value for 8 CPUs is 6000K, for 16 CPUs 12,000K, and so forth.)  | 
Total  | 
3940 K  | 
For a system with 4 CPUs.  | 
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