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-IPA:max_jobs=N : This option limits the maximum parallelism when invoking the compiler after IPA to (at most) N compilations running at once. The option can take the following values:
0 = The parallelism chosen is equal to either the number of CPUs, the number of cores, or the number of hyperthreading units in the compiling system, whichever is greatest.
1 = Disable parallelization during compilation (default)
>1 = Specifically set the degree of parallelism