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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?

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2 Answers 2

Reset to default
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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.

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    \$\begingroup\$ Probably worth marking this as accepted to stop the system bumping it back to the homepage. \$\endgroup\$
    – Tom Carpenter
    Commented Jun 30, 2017 at 16:12
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    \$\begingroup\$ 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. \$\endgroup\$
    – Simon Richter
    Commented Oct 9, 2018 at 18:40
  • \$\begingroup\$ @SimonRichter, what name and value would be used? \$\endgroup\$
    – JimFred
    Commented Oct 10, 2018 at 19:21
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    \$\begingroup\$ @JimFred set_global_assignment -name NUM_PARALLEL_PROCESSORS ALL \$\endgroup\$
    – matli
    Commented Mar 13, 2019 at 14:47
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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.

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