On Wed, Nov 5, 2014 at 10:44 AM, Bruce Dubbs <bruce.du...@gmail.com> wrote:
> Alex, I don't understand. > > Using > > --with-parallelism=$(getconf _NPROCESSORS_ONLN) will be translated to > --with-parallelism=8 (on my system) by the shell. This is exactly the > construct I'm using (but with a different number). > > Hi Bruce, Just a quick (not definitive:) reply - I stayed up late last night. I'll come with more technical "proof" later if needed; so please bear with me. 1. I think the missing "-j <some number - good or bad>" in the 'make' line I was talking about is pretty "damning". Anyway, I hate to subject your laptop to any more abuse, but this can be easily checked by, 1.1 Cleaning up things in the working directory (something like make distclean or a full nuke of directory and a redo of the procedure from tar ..., etc.) 1.2. Running Autogen with the fateful option exactly as "prescribed" by the book: --with-parallelism=$(getconf _NPROCESSORS_ONLN) 1.3. Running a "regular" build (you can kill it as soon as the eggs are done on the laptop :) the "old fashion" BLFS way: make build 2>&1 | tee make.txt ... and examine the main 'make' command line in the 'make.txt' file. I claim (I may be wrong of course - so what's new?) that the 'make' will not have the "-j ..." argument anywhere on that line. 2. For me, the proof of the pudding is the actual outcome: Without the " --with-parallelism=$(getconf _NPROCESSORS_ONLN) " or with just a "--with-parallelism" line (no "=", no nothing) for my 4-core system the build time is almost four times shorter than with the original --with-parallelism=$(getconf _NPROCESSORS_ONLN) as argument to Autogen. As an aside, I understand your point that people - if they are blessed with more than one core - can _control_ their destiny with something like --with-parallelism=<desired number of cores one would like to put to work> As yet another aside, maybe something like --with-parallelism=`getconf _NPROCESSORS_ONLN' # note the back apostrophs could be equivalent to the LO default (blast off all cores the sucker has) which is no "with-parallelism" line at all. Cheers, -- Ing. Alex
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