Compile package(s) using parallel jobs

For Developers
1

Hello.
Trying to compile package on AMD Ryzen Threadripper machine with 64 cores.
If I add PKG_BUILD_PARALLEL:=1 to Makefile of the package I see following in logs during package compilation: make --jobserver-auth=3,4 which is taken from include/package.mk:

MAKE_J:=$(if $(MAKE_JOBSERVER),$(MAKE_JOBSERVER) $(if $(filter 3.% 4.0 4.1,$(MAKE_VERSION)),-j))

ifeq ($(strip $(PKG_BUILD_PARALLEL)),0)
    PKG_JOBS?=-j1
else
    PKG_JOBS?=$(if $(PKG_BUILD_PARALLEL),$(MAKE_J),-j1)
endif

So I replaced it to:

ifeq ($(strip $(PKG_BUILD_PARALLEL)),0)
    PKG_JOBS?=-j1
else
    PKG_JOBS?=-j64
endif

But I think it is not proper way of achieving parallel compilation of package. Could someone point me to proper way of doing that?

2

This used to work for me without any code changes:

make defconfig
make -j 25 download
make -j 5
3

Same here make -j32.