Other system limits

These limits apply to the entire system:

Processes

A maximum of 4094 active at any time.

Prefix space (resource-manager attaches, etc.)

Limited by memory.

Sessions and process groups

4094 (since you need at least one process per session or group).

Physical address space

No limits, except those imposed by the hardware; see the documentation for the chip you're using.

These limits apply to each process:

• Number of threads: 32767
• Number of timers: 32767
• Priorities: 0 through 255

  Priority 0 is used for the idle thread; by default, priorities of 64 and greater are privileged, so only processes with an effective user ID of 0 (i.e., root) can use them. Non-root processes can use priorities from 1 through 63.

  You can change the range of privileged priorities with the -P option for procnto. In QNX Neutrino 6.6 or later, you can append an s or S to this option if you want out-of-range priority requests by default to use the maximum allowed priority (reach a “maximum saturation point”) instead of resulting in an error.