ML Network Fabric Simulator

Explore IB spine-leaf vs RoCE v2 fabrics across NCCL collective operations.

Simulation Settings

Topology NCCL Operation Racks Servers / Rack GPUs / Server Message Size (MB) Iterations Offered Load 0.75x Link Speed (Gbps)

RoCE v2 Congestion Controls

ECN Marking DCQCN (RP/NP) PFC Pause Frames RTT-based CC

InfiniBand Congestion Controls

Credit Flow Control FECN/BECN CCA Adaptive Routing VL Arbitration QoS

Fabric Activity

Awaiting simulation...

Results

Event Log

Telemetry Over Time (OS/DCGM-style)

Simulated rolling counters and rates over the selected iterations.