From: rjh@cpax.org.uk

On 30/10/2025 04:24, Keith Thompson wrote:
> I haven't been using make's "-j" option for most of my builds.
> I'm going to start doing so now (updating my wrapper script).

Well, let's see, on approximately 10,000 lines of code:

$ make clean
$time make

real	0m2.391s
user	0m2.076s
sys	0m0.286s

$ make clean
$time make -j $(nproc)

real	0m0.041s
user	0m0.021s
sys	0m0.029s

That's a reduction in wall clock time of 4 minutes per MLOC to 4
*seconds* per MLOC. I can't deny I'm impressed.

--
Richard Heathfield
Email: rjh at cpax dot org dot uk
"Usenet is a strange place" - dmr 29 July 1999
Sig line 4 vacant - apply within

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