Horizontal Sharded Swarm Scaling: 1 to 256 Workers Across 4 workerd Cells (q01..q16)
Measured on 4 parallel local Miniflare/workerd SQLite Durable Object + D1 cells with 256 distinct scoped principals
A. Aggregate Throughput (MCP Ops/sec & Tasks/sec)
B. Per-RPC Tail Latency (p50 / p95 / p99 in ms)
0
80
160
240
320
400
0ms
364ms
728ms
1092ms
1456ms
1820ms
68/s
22t/s
1w / 1c
4q
74/s
24t/s
4w / 1c
4q
169/s
54t/s
16w / 2c
8q
230/s
71t/s
64w / 4c
16q
269/s
77t/s
256w / 4c
16q
29.9
24.0
13.2
1w / 1c
0 collisions
200.5
98.5
46.6
4w / 1c
0 collisions
238.4
182.8
83.3
16w / 2c
0 collisions
817.1
412.6
190.5
64w / 4c
0 collisions
1537.2
1355.0
679.0
256w / 4c
0 collisions
MCP Tool Ops / sec
Completed Verb Leases / sec
p99 RPC Latency (ms)
p95 RPC Latency (ms)
p50 Median Latency (ms)
Fencing & Authority Invariants: Split-Brain Collisions = 0 | Expired Leases Reaped & Fenced (HTTP 409 stale_lease) = 16/16 | Self-Approvals Refused (HTTP 403) = 32/32 | Flawed Drafts Repaired via Tombstone = 150/150