[llvm-dev] LLD: time to enable --threads by default

[Rafael Espíndola via llvm-dev]

On 16 November 2016 at 15:52, Rafael Espíndola
<rafael.espindola at gmail.com> wrote:
> I will do a quick benchmark run.


On a mac pro (running linux) the results I got with all cores available:

firefox
  master 7.146418217
  patch  5.304271767 1.34729488437x faster
firefox-gc
  master 7.316743822
  patch  5.46436812 1.33899174824x faster
chromium
  master 4.265597914
  patch  3.972218527 1.07385781648x faster
chromium fast
  master 1.823614026
  patch  1.686059427 1.08158348205x faster
the gold plugin
  master 0.340167513
  patch  0.318601465 1.06768973269x faster
clang
  master 0.579914119
  patch  0.520784947 1.11353855817x faster
llvm-as
  master 0.03323043
  patch  0.041571719 1.251013574x slower
the gold plugin fsds
  master 0.36675887
  patch  0.350970944 1.04498356992x faster
clang fsds
  master 0.656180056
  patch  0.591607603 1.10914743602x faster
llvm-as fsds
  master 0.030324313
  patch  0.040045353 1.32056917497x slower
scylla
  master 3.23378908
  patch  2.019191831 1.60152642773x faster

With only 2 cores:

firefox
  master 7.174839911
  patch  6.319808477 1.13529388384x faster
firefox-gc
  master 7.345525844
  patch  6.493005841 1.13129820362x faster
chromium
  master 4.180752414
  patch  4.129515199 1.01240756179x faster
chromium fast
  master 1.847296843
  patch  1.78837299 1.0329483018x faster
the gold plugin
  master 0.341725451
  patch  0.339943222 1.0052427255x faster
clang
  master 0.581901114
  patch  0.566932481 1.02640284955x faster
llvm-as
  master 0.03381059
  patch  0.036671392 1.08461260215x slower
the gold plugin fsds
  master 0.369184003
  patch  0.368774353 1.00111084189x faster
clang fsds
  master 0.660120583
  patch  0.641040511 1.02976422187x faster
llvm-as fsds
  master 0.031074029
  patch  0.035421531 1.13990789543x slower
scylla
  master 3.243011681
  patch  2.630991522 1.23261958615x faster


With only 1 core:

firefox
  master 7.174323116
  patch  7.301968002 1.01779190649x slower
firefox-gc
  master 7.339104117
  patch  7.466171668 1.01731376868x slower
chromium
  master 4.176958448
  patch  4.188387233 1.00273615003x slower
chromium fast
  master 1.848922713
  patch  1.858714219 1.00529578978x slower
the gold plugin
  master 0.342383846
  patch  0.347106743 1.01379415838x slower
clang
  master 0.582476955
  patch  0.600524655 1.03098440178x slower
llvm-as
  master 0.033248459
  patch  0.035622988 1.07141771593x slower
the gold plugin fsds
  master 0.369510236
  patch  0.376390506 1.01861997133x slower
clang fsds
  master 0.661267753
  patch  0.683417482 1.03349585535x slower
llvm-as fsds
  master 0.030574688
  patch  0.033052779 1.08105041006x slower
scylla
  master 3.236604638
  patch  3.325831407 1.02756801617x slower

Given that we have an improvement even with just two cores available, LGTM.

Cheers,
Rafael