# Altera Quartus “Warning (18236): Number of processors has not been specified…”, how to suppress?

My Altera Quartus builds show this warning...

Warning (18236): Number of processors has not been specified which may cause overloading on shared machines.  Set the global assignment NUM_PARALLEL_PROCESSORS in your QSF to an appropriate value for best performance.


How do I suppress this warning?

## 1 Answer

Add this tcl expression...

set_global_assignment -name NUM_PARALLEL_PROCESSORS 4


... to either assignment_defaults.qdf or the .qsf file. Both should be in the project's directory. The .qdf file may need to be created.

• Probably worth marking this as accepted to stop the system bumping it back to the homepage. – Tom Carpenter Jun 30 '17 at 16:12
• There is also an option to use all available processors, which also gets rid of the warning, and adjusts the setting to whatever machine the compile runs on. – Simon Richter Oct 9 '18 at 18:40
• @SimonRichter, what name and value would be used? – JimFred Oct 10 '18 at 19:21
• @JimFred set_global_assignment -name NUM_PARALLEL_PROCESSORS ALL – matli Mar 13 at 14:47