关于 c：如何在 OSX 上使用多线程安装 XGBoost

Ben$ brew install gcc —without–multilib
Error: gcc–5.3.0 already installed
To install this version, first `brew unlink gcc`

Ben$ brew unlink gcc
Unlinking /usr/local/Cellar/gcc/5.3.0… 1288 symlinks removed

Ben$ brew install gcc —without–multilib
[26 minutes later]
==> Summary
e??o  /usr/local/Cellar/gcc/6.2.0: 1,358 files, 238.3M, built in 26 minutes 20 seconds

Ben$ git clone —recursive https://github.com/dmlc/xgboost
Cloning into ‘xgboost’…
remote: Counting objects: 18754, done.
remote: Compressing objects: 100% (21/21), done.
remote: Total 18754 (delta 1), reused 0 (delta 0), pack–reused 18733
Receiving objects: 100% (18754/18754), 6.23 MiB | 3.74 MiB/s, done.
Resolving deltas: 100% (11347/11347), done.
Checking connectivity… done.
Submodule ‘dmlc-core’ (https://github.com/dmlc/dmlc-core) registered for path ‘dmlc-core’
Submodule ‘rabit’ (https://github.com/dmlc/rabit) registered for path ‘rabit’
Cloning into ‘/Users/Ben/xgboost/dmlc-core’…
Cloning into ‘/Users/Ben/xgboost/rabit’…
Submodule path ‘dmlc-core’: checked out ‘f35f14f30835af238257b979cc1fac3e41ff3291’
Submodule path ‘rabit’: checked out ‘a9a2a69dc1144180a43f7d2d1097264482be7817’

# on Mac OS X, force brew gcc-6, since the Xcode c++ fails anyway
# it is useful for pip install compiling-on-the-fly
OS := $(shell uname)
ifeq ($(OS), Darwin)
export CC = $(if $(shell which gcc–6),gcc–6,$(if $(shell which gcc–mp–6), gcc–mp–6, clang))
export CXX = $(if $(shell which g++-6),g++-6,$(if $(shell which g++-mp–6),g++-mp–6, clang++))
endif

Ben$ cd xgboost; cp make/config.mk ./config.mk; make –j4
[Tons of log output. Appears to finish succesfully]
…
g++-6 –std=c++0x –Wall –O3 –msse2  –Wno–unknown–pragmas –funroll–loops –Iinclude   –Idmlc–core/include –Irabit/include –fPIC –fopenmp –shared –o lib/libxgboost.so build/learner.o build/logging.o build/c_api/c_api.o build/c_api/c_api_error.o build/common/common.o build/data/data.o build/data/simple_csr_source.o build/data/simple_dmatrix.o build/data/sparse_page_dmatrix.o build/data/sparse_page_raw_format.o build/data/sparse_page_source.o build/data/sparse_page_writer.o build/gbm/gblinear.o build/gbm/gbm.o build/gbm/gbtree.o build/metric/elementwise_metric.o build/metric/metric.o build/metric/multiclass_metric.o build/metric/rank_metric.o build/objective/multiclass_obj.o build/objective/objective.o build/objective/rank_obj.o build/objective/regression_obj.o build/tree/tree_model.o build/tree/tree_updater.o build/tree/updater_colmaker.o build/tree/updater_histmaker.o build/tree/updater_prune.o build/tree/updater_refresh.o build/tree/updater_skmaker.o build/tree/updater_sync.o dmlc–core/libdmlc.a rabit/lib/librabit.a –pthread –lm  –fopenmp

library(devtools)
install("/Users/Ben/xgboost/R-package")

Installing xgboost
‘/Library/Frameworks/R.framework/Resources/bin/R’ —no–site–file —no–environ —no–save —no–restore —quiet CMD INSTALL  //
  ‘/Users/Ben/xgboost/R-package’ —library=‘/Library/Frameworks/R.framework/Versions/3.3/Resources/library’ —install–tests

* installing *source* package a€?xgboosta€? …
** libs
g++-5 –std=c++11 –I/Library/Frameworks/R.framework/Resources/include –DNDEBUG –I../..//include -I../..//dmlc-core/include -I../..//rabit/include -I../../ -DXGBOOST_STRICT_R_MODE=1 -DDMLC_LOG_BEFORE_THROW=0 -DDMLC_ENABLE_STD_THREAD=1 -DDMLC_DISABLE_STDIN=1 -DDMLC_LOG_CUSTOMIZE=1 -DXGBOOST_CUSTOMIZE_LOGGER=1 -DRABIT_CUSTOMIZE_MSG_ -DRABIT_STRICT_CXX98_ -I/usr/local/opt/llvm/include   -fopenmp  -fPIC  -Wall -mtune=core2 -g -O2 -c xgboost_R.cc -o xgboost_R.o
make: g++-5: No such file or directory
make: *** [xgboost_R.o] Error 1
ERROR: compilation failed for package a€?xgboosta€?
* removing a€?/Library/Frameworks/R.framework/Versions/3.3/Resources/library/xgboosta€?
* restoring previous a€?/Library/Frameworks/R.framework/Versions/3.3/Resources/library/xgboosta€?
Error: Command failed (1)

set.seed(222)
N <– 2*10^5
p <– 350
x <– matrix(rnorm(N  * p), ncol = p)
y <– rnorm(N)

system.time(mymodel <– xgboost(
  # nthread = 4,
  data = x,
  label = y,
  nrounds = 5,
  objective ="reg:linear",
  tree_method ="exact",
  max_depth = 10,
  min_child_weight = 1,
  eta = 1,
  subsample = 0.66,
  colsample_bytree = 0.33
))

# Tested on 2018 MPB, xgboost version 0.82.0.1, multi-threaded version
# nthread = default:   7.4 seconds (elapsed)
# nthread = 1:        24.0 seconds (elapsed)
# nthread = 2:        13.7 seconds (elapsed)
# nthread = 4:         7.5 seconds (elapsed)

CC=gcc–5
CXX=g++-5
CXX1X = g++-5

CC=gcc–6
CXX=g++-6
CXX1X = g++-6

install.packages("drat", repos="https://cran.rstudio.com")
drat:::addRepo("dmlc")
install.packages("xgboost", repos="http://dmlc.ml/drat/", type ="source")