[Bug 254763] grep very slow with 13.0-RC4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254763

--- Comment #21 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #20)

I time both the left hand side and right hand side processes
here:

# /usr/bin/time -l cat access_log.txt | time -l cat > output.log
        0.65 real         0.00 user         0.00 sys
         0  maximum resident set size
         0  average shared memory size
         0  average unshared data size
         0  average unshared stack size
       154  page reclaims
         0  page faults
         0  swaps
         0  block input operations
         0  block output operations
      1104  messages sent
         0  messages received
         0  signals received
       233  voluntary context switches
         1  involuntary context switches
        0.65 real         0.00 user         0.00 sys
      2440  maximum resident set size
         8  average shared memory size
         8  average unshared data size
       128  average unshared stack size
       146  page reclaims
         0  page faults
         0  swaps
         0  block input operations
       549  block output operations
         0  messages sent
       549  messages received
         0  signals received
       357  voluntary context switches
         0  involuntary context switches

# /usr/bin/time -l cat access_log.txt | time -l grep -F -v -f exclude_ips.txt >
output2.log
      422.70 real         0.00 user         0.00 sys
      2360  maximum resident set size
         8  average shared memory size
         8  average unshared data size
       128  average unshared stack size
       155  page reclaims
         0  page faults
         0  swaps
         0  block input operations
         0  block output operations
      1104  messages sent
         0  messages received
         0  signals received
       138  voluntary context switches
         0  involuntary context switches
      431.63 real       431.57 user         0.04 sys
    168164  maximum resident set size
        20  average shared memory size
         8  average unshared data size
       128  average unshared stack size
     41463  page reclaims
         0  page faults
         0  swaps
         0  block input operations
        32  block output operations
         0  messages sent
       138  messages received
         0  signals received
       168  voluntary context switches
      4969  involuntary context switches

So the "grep -F -v -f exclude_ips.txt" is compute bound (user), not I/O bound.
The "cat" right hand side, by contrast, was not compute bound (user) --and was
not made to be time consuming overall.

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