Miscellany

interlocked::increment cost == 81 ns
interlocked::decrement cost == 85 ns
interlocked::exchange cost == 86 ns
interlocked::compare_exchange cost == 95 ns
interlocked::or cost == 94 ns
interlocked::and cost == 85 ns
interlocked::bit_test_and_set cost == 91 ns

1 reader, 0 writer, 1 upgrader...

weight      system approach        simple approach        advanced approach
    10      2328ms(n.a.)           2323ms(1.00,77)        1373ms(1.00,127)
   100      4104ms(n.a.)           5377ms(1.00,1)         2668ms(1.00,122)
  1000     15561ms(n.a.)          20226ms(1.00,60)        7127ms(1.00,113)

2 reader, 0 writer, 1 upgrader...

weight      system approach        simple approach        advanced approach
    10      3945ms(n.a.)           3423ms(1.00,122)       1442ms(1.15,105)
   100      8613ms(n.a.)           8106ms(1.00,109)       1222ms(1.02,117)
  1000     25882ms(n.a.)          30987ms(1.00,126)       7669ms(1.04,94)

8 reader, 2 writer, 2 upgrader...

weight      system approach        simple approach        advanced approach
    10     21322ms(n.a.)          18644ms(1.00,127)      10342ms(1.00,127)
   100     40691ms(n.a.)          43463ms(1.00,127)      16074ms(1.00,127)
  1000    113763ms(n.a.)         146471ms(1.00,127)      79641ms(1.00,127)