[R] .Call using multiple cores on linux after R 3.3.3

[Youyi Fong]

Hi, I am wondering why it is the case that in R 3.3.3, calling
chngpt:chngptm uses only 1 core, but in later releases, e.g. R 3.4.3, it
uses multiple cores on linux. The function chngpt:chngptm has a .Call to
invoke a C/C++ function that performs bootstrapping. No explicit parallel
computing instructions are used.
Thanks,
Youyi

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