CPU scaling benchmark
workers
0 +1 main
iters total
1B
1000000000/stream
elapsed
8638.82 ms
total CPU used
8638.8 ms
speedup
1×
vs serial
efficiency
100%
of 1× ideal
| stream | spawn ms | spawned@ | work start@ | work end@ | work ms | reap wait ms |
|---|---|---|---|---|---|---|
| 0 (main) | 0 | 0 | 0.01 | 8638.81 | 8638.8 | 0 |
main
fork+handshake
CPU work
parent reap wait
what this measures
Each stream runs a tight integer LCG loop — working set is one CPU register, no memory access,
no shared data. Speedup = sum(stream CPU time) / wall-clock elapsed. Efficiency = speedup / (workers+1).
100% efficiency means perfect linear scaling; less than 100% is the cost of serial fork setup,
reap tail, SMT/core contention.