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rc: implement parallel boot

Description

rc: implement parallel boot

take advantage of the rcorder -p argument to implement parallel
booting in rc.

According to the author non scientific tests:
on a Core 2 Duo with spinning disk:

Services enabledbeforeaftersaving
08s8s0
113s13s0
217s13s5
323s13s10
428s13s15
533s13s20

PR: 249192
MFC after: 3 weeks

Details

Provenance
unitrunker_gmail.comAuthored on Feb 7 2021, 6:15 AM
baptCommitted on Feb 23 2021, 10:16 AM
Parents
R10:f3f7b0dc065c: lib/msun/ctrig_test: Print the mismatched values on failure
Branches
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Reverted By
R10:f61831d2e8bd: Revert "rc: implement parallel boot"