git: kernel - Increase worst-case maximum exec rate

[Matthew Dillon]

commit 8cdef6cbcc73174e567af3341631ec8fa492796a
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Mon Dec 5 16:49:04 2016 -0800

    kernel - Increase worst-case maximum exec rate
    
    * The pid reuse algorithm limits the maximum fork rate.  This limit
      was set too low.  Increase the limit from 10000/sec to 100000/sec.
      Currently our opteron maxes out at 43000/sec.
    
      Note that with 999999 pids and a 10-second mandatory reuse time
      floor there isn't much of a point increasing the limit beyond
      100000/sec.
    
      100,000/sec.  Currently our opteron maxes out at around
      43,000/sec (vfork/exec/wait3/exit of a small static binary).
    
    * The domain reuse array was increased to 1MB to accomodate this
      change.  In addition, update the array in a cache-friendly manner.
    
    * Modify test/sysperf/exec1 to take a nprocesses argument for the
      timing run.

Summary of changes:
 sys/kern/kern_proc.c | 29 ++++++++++++++++++++++-------
 test/sysperf/exec1.c | 35 ++++++++++++++++++++++++++++-------
 2 files changed, 50 insertions(+), 14 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/8cdef6cbcc73174e567af3341631ec8fa492796a


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