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Benjamin KietzmanWes McKinney
044b418fa10
Benjamin Kietzman authored and Wes McKinney committed 4d6d7d50835
ARROW-4312: [C++] Only run 2 * os.cpu_count() clang-format instances at once

Author: Benjamin Kietzman <bengilgit@gmail.com>

Closes #3447 from bkietz/ARROW-4312-run-clang-format-in-batches and squashes the following commits:

2a51818f2 <Benjamin Kietzman> launch only cpu_count()*2 parallel processes
0f530760a <Benjamin Kietzman> only run 16**2 clang-format instances at once