SQL/MP Programming Manual for C

Program Execution
HP NonStop SQL/MP Programming Manual for C—429847-008
7-4
Running a Program at a Low PIN
Running a Program at a Low PIN
The operating system identifies a process (a running program) by a unique process
identification number (PIN). In displays and printouts, a PIN usually appears after the
number of the processor where the process is running. For example, the operating
system identifies a process in processor 4 with PIN 195 as 4,195.
The operating system supports an architectural limit of 65,535 concurrent processes
per processor. The actual number of concurrent processes depends on the available
system resources (for example, virtual memory) and the values specified during
system generation.
A PIN has these divisions:

A low PIN ranges from 0 through 254.

A high PIN ranges from 256 through 65,535 (or the maximum number).

PIN 255 is reserved.
Figure 7-1 shows various processes running in a processor on an HP NonStop system.
Figure 7-1. Processes Running on a NonStop System
NonStop
Subsystems
Operating
System
Operating
System
NonStop
Subsystems
Low-PIN Processes: PINs 0 – 254
High-PIN Processes: PINs - 256
PIN 255 is reserved.
Processor (CPU)
User
Applications
User
Applications
VST010.vsd