Altera Quartus "Warning (18236): Number of processors has not been specified...", how to suppress?

Question

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?

JimFred · Accepted Answer · 2020-08-27T02:11:35.683

10

Add this tcl expression...

set_global_assignment -name NUM_PARALLEL_PROCESSORS ALL

... 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.

edited Aug 27 '20 at 02:11

answered Apr 23 '17 at 12:45

JimFred

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Probably worth marking this as accepted to stop the system bumping it back to the homepage. – Tom Carpenter Jun 30 '17 at 16:12
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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 09 '18 at 18:40
@SimonRichter, what name and value would be used? – JimFred Oct 10 '18 at 19:21
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@JimFred `set_global_assignment -name NUM_PARALLEL_PROCESSORS ALL` – matli Mar 13 '19 at 14:47

Lissanro Rayen · Answer 2 · 2020-11-17T13:21:59.317

Many recommend creating assignment_defaults.qdf in project's directory, but then each project would contain unnecessary file just to get rid of this warning. I wanted to add this to global config in Linux but googling turned up either nothing or deprecated information. I ended up using strace to find global config file:

/opt/quartus/quartus/linux64/assignment_defaults.qdf

After adding set_global_assignment -name NUM_PARALLEL_PROCESSORS ALL to it the warning was gone in all projects.

Altera Quartus "Warning (18236): Number of processors has not been specified...", how to suppress?

2 Answers2