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* src/sort.c (main): If --parallel isn't specified,
restrict the number of threads to 8 by default.
If the --parallel option is specified, then
allow any number of threads to be set, independent
of the number of processors on the system.
* doc/coreutils.texi (sort invocation): Document the changes
to determining the number of threads to use.
Mention the memory overhead when using multiple threads.
* tests/misc/sort-spinlock-abuse: Allow single core
systems that support pthreads.
* tests/misc/sort-stale-thread-mem: Likewise.
* tests/misc/sort-unique-segv: Likewise.
* NEWS: Mention the change in behaviour.
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* tests/misc/sort-stale-thread-mem: Fix typo in comment.
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* tests/misc/sort-stale-thread-mem: Don't initialize fail=0 here;
that is done in init.sh. This avoids a syntax-check failure.
Invoke "Exit $fail" at end, too.
Mark as a very expensive test.
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* tests/misc/sort-stale-thread-mem: New tests.
* tests/Makefile.am (TESTS): Add it.
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