Bug#864639: nvidia-kernel-dkms: please support parallel builds

[Andras Korn]

Package: nvidia-kernel-dkms
Version: 375.66-1
Severity: wishlist
Tags: upstream

Hi,

the nvidia driver consists of several files that can be compiled in
parallel, but the dkms.conf file specifically forces a single-threaded build
even if dkms would pass make(1) a -j flag. (Also, while I'm sure there once
was a reason for setting CCACHE_DISABLE=1, does it still apply?)

On my system, -j8 results in a dramatic improvement (build time decreases
from about 7 minutes to about 1 minute).

In dkms.conf, I changed

MAKE[0]="unset ARCH; env CCACHE_DISABLE=1 NV_VERBOSE=1 \
    make modules KERNEL_UNAME=${kernelver}"

to

MAKE[0]="unset ARCH; env CCACHE_DISABLE=1 NV_VERBOSE=1 \
    make -j8 modules KERNEL_UNAME=${kernelver}"

and got a nice speed boost (which adds up if you have several kernels
installed).

I haven't tested it, but maybe the following would work:

[ -x /usr/bin/nproc ] && JOBS="-j$(nproc)"
MAKE[0]="unset ARCH; env CCACHE_DISABLE=1 NV_VERBOSE=1 \
    make $JOBS modules KERNEL_UNAME=${kernelver}"

Andras

-- 
    If everyone needs to think outside the box, maybe the box needs fixing.