Data.table: Fail to install the latest version of data.table

Created on 22 May 2020  Â·  11Comments  Â·  Source: Rdatatable/data.table

I have run the following

remove.packages("data.table")
install.packages("data.table", type = "source",
    repos = "https://Rdatatable.gitlab.io/data.table")

And have done the steps as suggested by data.table/wiki/Installation

The following is the output I got

````
Installing package into ‘/Users/lzhan/R’
(as ‘lib’ is unspecified)
trying URL 'https://Rdatatable.gitlab.io/data.table/src/contrib/data.table_1.12.9.tar.gz'

Content type 'application/gzip' length 5195275 bytes (5.0 MB)

downloaded 5.0 MB

[1] "en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8"

  • installing source package ‘data.table’ ...
    * using staged installation
    pkg-config is not installed.
    Compilation will now be attempted and if it works you can ignore this message. However,
    if compilation fails, try 'locate zlib.h zconf.h' and ensure the zlib development library
    is installed :
    deb: zlib1g-dev (Debian, Ubuntu, ...)
    rpm: zlib-devel (Fedora, EPEL, ...)
    brew: zlib (OSX)
    Note that zlib is required to compile R itself so you may find the advice in the R-admin
    guide helpful regarding zlib. On Debian/Ubuntu, zlib1g-dev is a dependency of r-base as
    shown by 'apt-cache showsrc r-base | grep ^Build-Depends | grep zlib', and therefore
    'sudo apt-get build-dep r-base' should be sufficient too.
    To silence this message, please ensure that :
    1) 'pkg-config --exists zlib' succeeds (i.e. $? -eq 0)
    2) 'pkg-config --libs zlib' contains -lz
    Compilation will now be attempted ...
    * libs
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c assign.c -o assign.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c between.c -o between.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c bmerge.c -o bmerge.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c chmatch.c -o chmatch.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c cj.c -o cj.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c coalesce.c -o coalesce.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c dogroups.c -o dogroups.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c fastmean.c -o fastmean.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c fcast.c -o fcast.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c fifelse.c -o fifelse.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c fmelt.c -o fmelt.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c forder.c -o forder.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c frank.c -o frank.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c fread.c -o fread.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c freadR.c -o freadR.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c froll.c -o froll.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c frollR.c -o frollR.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c frolladaptive.c -o frolladaptive.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c fsort.c -o fsort.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c fwrite.c -o fwrite.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c fwriteR.c -o fwriteR.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c gsumm.c -o gsumm.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c ijoin.c -o ijoin.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c init.c -o init.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c inrange.c -o inrange.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c nafill.c -o nafill.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c nqrecreateindices.c -o nqrecreateindices.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c openmp-utils.c -o openmp-utils.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c quickselect.c -o quickselect.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c rbindlist.c -o rbindlist.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c reorder.c -o reorder.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c shift.c -o shift.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c subset.c -o subset.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c transpose.c -o transpose.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c types.c -o types.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c uniqlist.c -o uniqlist.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c utils.c -o utils.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c vecseq.c -o vecseq.o
    /usr/local/gfortran/bin/gcc -fopenmp -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG -I/usr/local/opt/gettext/include -I/usr/local/opt/llvm/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -fPIC -g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe -c wrappers.c -o wrappers.o
    /usr/local/gfortran/bin/gcc -fopenmp -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress -L/Library/Frameworks/R.framework/Resources/lib -L/usr/local/opt/gettext/lib -L/usr/local/opt/llvm/lib -Wl,-rpath,/usr/local/opt/llvm/lib -o data.table.so assign.o between.o bmerge.o chmatch.o cj.o coalesce.o dogroups.o fastmean.o fcast.o fifelse.o fmelt.o forder.o frank.o fread.o freadR.o froll.o frollR.o frolladaptive.o fsort.o fwrite.o fwriteR.o gsumm.o ijoin.o init.o inrange.o nafill.o nqrecreateindices.o openmp-utils.o quickselect.o rbindlist.o reorder.o shift.o subset.o transpose.o types.o uniqlist.o utils.o vecseq.o wrappers.o -F/Library/Frameworks/R.framework/.. -framework R -Wl,-framework -Wl,CoreFoundation
    installing to /Users/lzhan/R/00LOCK-data.table/00new/data.table/libs
    *
    R
    * inst
    *
    byte-compile and prepare package for lazy loading
    [1] "en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8"
    * help
    *
    installing help indices
    *
    building package indices
    [1] "en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8"
    * installing vignettes
    *
    testing if installed package can be loaded from temporary location
    [1] "en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8"
    Error: package or namespace load failed for ‘data.table’ in library.dynam(lib, package, package.lib):
    shared object ‘datatable.so’ not found
    Error: loading failed
    Execution halted
    ERROR: loading failed
  • removing ‘/Users/lzhan/R/data.table’
  • restoring previous ‘/Users/lzhan/R/data.table’

The downloaded source packages are in
‘/private/var/folders/qz/0srg88cd2459h1cbn623wrt00000gq/T/RtmpYalyyw/downloaded_packages’
Warning message:
In install.packages("data.table", type = "source", repos = "https://Rdatatable.gitlab.io/data.table") :
installation of package ‘data.table’ had non-zero exit status

````

# Output of sessionInfo()

R version 4.0.0 (2020-04-24)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Mojave 10.14.6

Matrix products: default
BLAS:   /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRblas.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] compiler_4.0.0 tools_4.0.0 

install platform-specific

Most helpful comment

I was facing the same problems as you and tried all methods as mentioned in #4435, #4348 and #4158.

For me, the solution was to follow the wiki to install a LLVM compiler with openMP support. However, instead of installing the data.table package using

remove.packages("data.table")
install.packages("data.table", type = "source",
    repos = "https://Rdatatable.gitlab.io/data.table")

I defaulted to using the standard repo, i.e.,

install.packages("data.table", type = "source")

which will install data.table version 1.12.8 instead of 1.12.9. I don't know exactly why this works but it does the job for me. Maybe @MichaelChirico knows how this could possibly make a difference?

All 11 comments

Thanks for the report. I'm afraid at the moment it's a bit unreadable.

@likanzhan can you add the _full_ output of your installation log to the issue body?

I was facing the same problems as you and tried all methods as mentioned in #4435, #4348 and #4158.

For me, the solution was to follow the wiki to install a LLVM compiler with openMP support. However, instead of installing the data.table package using

remove.packages("data.table")
install.packages("data.table", type = "source",
    repos = "https://Rdatatable.gitlab.io/data.table")

I defaulted to using the standard repo, i.e.,

install.packages("data.table", type = "source")

which will install data.table version 1.12.8 instead of 1.12.9. I don't know exactly why this works but it does the job for me. Maybe @MichaelChirico knows how this could possibly make a difference?

@markkvdb thx, after many futile attempts your quick-fix worked for me too

@sorhawell and @markkvdb ,

I think the real problem is that we want to install the new version, i.e., 1.12.9, not the old one.

@likanzhan The title refers to the latest version of data.table. Version 1.12.9 is the latest unreleased version, while 1.12.8 is the latest released version. So, my contribution above is for people who want a recent (or latest) version of data.table that works on MacOS.

If you happen to find a solution to the problem many users are facing with installing version 1.12.9 then feel free to share it.

@likanzhan The title refers to the latest version of data.table. Version 1.12.9 is the latest unreleased version, while 1.12.8 is the latest released version. So, my contribution above is for people who want a recent (or latest) version of data.table that works on MacOS.

If you happen to find a solution to the problem many users are facing with installing version 1.12.9 then feel free to share it.

I do not have a solution, and that is the reason why I open this issue.

Facing a similar problem previously and tried both llvm and gcc ...
Finally found an available issue @likanzhan
https://github.com/Rdatatable/data.table/issues/4574
Hope it can help you as well!

Facing a similar problem previously and tried both llvm and gcc ...
Finally found an available issue @likanzhan

4574

Hope it can help you as well!

This worked for me; thank you very much for the link!

@likanzhan could you try on recent data.table version? There have been improvements added in 1.13.2 for installation on Mac so you may now be able to install 1.13.3. If you still have problems you may also consult working examples of makevars in https://github.com/Rdatatable/data.table/issues/4348

Thanks, @jangorecki

It seems working now.

I first run:

install.packages("data.table", type = "source",
    repos = "https://Rdatatable.gitlab.io/data.table")
library(data.table)

And I got the following information:

data.table 1.13.3 IN DEVELOPMENT built 2020-11-13 08:27:45 UTC; root using 4 threads (see ?getDTthreads).  Latest news: r-datatable.com

@likanzhan thanks for update

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