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opt ll dispatch layered algo #425

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@alpha-baby alpha-baby commented Sep 24, 2025 •
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1. Optimization Strategies

Update later

2. test env

#nvidia-smi topo -m
        GPU0    GPU1    GPU2    GPU3    GPU4    GPU5    GPU6    GPU7    NIC0    NIC1    NIC2    NIC3    NIC4    NIC5    NIC6    NIC7    CPU Affinity    NUMA Affinity   GPU NUMA ID
GPU0     X      NV18    NV18    NV18    NV18    NV18    NV18    NV18    PIX     NODE    NODE    NODE    SYS     SYS     SYS     SYS     0-47,96-143     0               N/A
GPU1    NV18     X      NV18    NV18    NV18    NV18    NV18    NV18    NODE    PIX     NODE    NODE    SYS     SYS     SYS     SYS     0-47,96-143     0               N/A
GPU2    NV18    NV18     X      NV18    NV18    NV18    NV18    NV18    NODE    NODE    PIX     NODE    SYS     SYS     SYS     SYS     0-47,96-143     0               N/A
GPU3    NV18    NV18    NV18     X      NV18    NV18    NV18    NV18    NODE    NODE    NODE    PIX     SYS     SYS     SYS     SYS     0-47,96-143     0               N/A
GPU4    NV18    NV18    NV18    NV18     X      NV18    NV18    NV18    SYS     SYS     SYS     SYS     PIX     NODE    NODE    NODE    48-95,144-191   1               N/A
GPU5    NV18    NV18    NV18    NV18    NV18     X      NV18    NV18    SYS     SYS     SYS     SYS     NODE    PIX     NODE    NODE    48-95,144-191   1               N/A
GPU6    NV18    NV18    NV18    NV18    NV18    NV18     X      NV18    SYS     SYS     SYS     SYS     NODE    NODE    PIX     NODE    48-95,144-191   1               N/A
GPU7    NV18    NV18    NV18    NV18    NV18    NV18    NV18     X      SYS     SYS     SYS     SYS     NODE    NODE    NODE    PIX     48-95,144-191   1               N/A
NIC0    PIX     NODE    NODE    NODE    SYS     SYS     SYS     SYS      X      NODE    NODE    NODE    SYS     SYS     SYS     SYS
NIC1    NODE    PIX     NODE    NODE    SYS     SYS     SYS     SYS     NODE     X      NODE    NODE    SYS     SYS     SYS     SYS
NIC2    NODE    NODE    PIX     NODE    SYS     SYS     SYS     SYS     NODE    NODE     X      NODE    SYS     SYS     SYS     SYS
NIC3    NODE    NODE    NODE    PIX     SYS     SYS     SYS     SYS     NODE    NODE    NODE     X      SYS     SYS     SYS     SYS
NIC4    SYS     SYS     SYS     SYS     PIX     NODE    NODE    NODE    SYS     SYS     SYS     SYS      X      NODE    NODE    NODE
NIC5    SYS     SYS     SYS     SYS     NODE    PIX     NODE    NODE    SYS     SYS     SYS     SYS     NODE     X      NODE    NODE
NIC6    SYS     SYS     SYS     SYS     NODE    NODE    PIX     NODE    SYS     SYS     SYS     SYS     NODE    NODE     X      NODE
NIC7    SYS     SYS     SYS     SYS     NODE    NODE    NODE    PIX     SYS     SYS     SYS     SYS     NODE    NODE    NODE     X 

Legend:

  X    = Self
  SYS  = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI)
  NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node
  PHB  = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU)
  PXB  = Connection traversing multiple PCIe bridges (without traversing the PCIe Host Bridge)
  PIX  = Connection traversing at most a single PCIe bridge
  NV#  = Connection traversing a bonded set of # NVLinks

NIC Legend:

  NIC0: mlx5_bond_0
  NIC1: mlx5_bond_1
  NIC2: mlx5_bond_2
  NIC3: mlx5_bond_3
  NIC4: mlx5_bond_4
  NIC5: mlx5_bond_5
  NIC6: mlx5_bond_6
  NIC7: mlx5_bond_7

NIC:

Mellanox [ConnectX-7]
2 port
per port speed: 200 Gbps

3. performance test result:

# num_rank dispatch before opt dispatch after opt Reduce percentage
1 8 37.09 us 60.72 us -63.70%
2 16 142.64 us 78.89 us 44.69%
3 24 150.10 us 91.19 us 39.24%
4 32 169.08 us 112.45 us 33.49%
5 48 180.25 us 135.50 us 24.82%

4. performance test raw result:

8rank(one node server)

before opt：

[rank 4] Dispatch + combine bandwidth: 193.41 GB/s, avg_t=114.00 us, min_t=111.01 us, max_t=117.50 us
[rank 2] Dispatch + combine bandwidth: 193.42 GB/s, avg_t=113.99 us, min_t=111.33 us, max_t=116.96 us
[rank 0] Dispatch + combine bandwidth: 193.48 GB/s, avg_t=113.95 us, min_t=111.01 us, max_t=117.09 us
[rank 1] Dispatch + combine bandwidth: 193.45 GB/s, avg_t=113.97 us, min_t=111.17 us, max_t=117.66 us
[rank 6] Dispatch + combine bandwidth: 193.37 GB/s, avg_t=114.02 us, min_t=111.36 us, max_t=117.95 us
[rank 7] Dispatch + combine bandwidth: 193.70 GB/s, avg_t=113.83 us, min_t=110.40 us, max_t=116.64 us
[rank 3] Dispatch + combine bandwidth: 193.27 GB/s, avg_t=114.08 us, min_t=110.43 us, max_t=116.54 us
[rank 5] Dispatch + combine bandwidth: 193.47 GB/s, avg_t=113.96 us, min_t=110.53 us, max_t=117.60 us
[rank 2] Dispatch bandwidth: 203.70 GB/s, avg_t=36.88 us | Combine bandwidth: 215.93 GB/s, avg_t=67.32 us
[rank 1] Dispatch bandwidth: 202.55 GB/s, avg_t=37.09 us | Combine bandwidth: 216.80 GB/s, avg_t=67.05 us
[rank 6] Dispatch bandwidth: 203.53 GB/s, avg_t=36.91 us | Combine bandwidth: 214.65 GB/s, avg_t=67.72 us
[rank 3] Dispatch bandwidth: 204.55 GB/s, avg_t=36.72 us | Combine bandwidth: 214.41 GB/s, avg_t=67.80 us
[rank 5] Dispatch bandwidth: 208.09 GB/s, avg_t=36.10 us | Combine bandwidth: 212.45 GB/s, avg_t=68.42 us
[rank 0] Dispatch bandwidth: 207.21 GB/s, avg_t=36.25 us | Combine bandwidth: 216.76 GB/s, avg_t=67.06 us
[rank 7] Dispatch bandwidth: 207.24 GB/s, avg_t=36.25 us | Combine bandwidth: 214.30 GB/s, avg_t=67.83 us
[rank 4] Dispatch bandwidth: 203.28 GB/s, avg_t=36.95 us | Combine bandwidth: 215.13 GB/s, avg_t=67.57 us
[rank 1] Dispatch send/recv time: 30.34 + 8.34 us | Combine send/recv time: 53.37 + 10.06 us
[rank 2] Dispatch send/recv time: 30.19 + 8.40 us | Combine send/recv time: 53.76 + 10.28 us
[rank 7] Dispatch send/recv time: 29.60 + 8.34 us | Combine send/recv time: 51.73 + 10.22 us
[rank 6] Dispatch send/recv time: 29.92 + 8.45 us | Combine send/recv time: 53.37 + 9.97 us
[rank 0] Dispatch send/recv time: 29.06 + 8.65 us | Combine send/recv time: 53.17 + 10.08 us
[rank 3] Dispatch send/recv time: 29.42 + 9.52 us | Combine send/recv time: 50.76 + 10.21 us
[rank 5] Dispatch send/recv time: 29.09 + 8.31 us | Combine send/recv time: 51.54 + 10.21 us
[rank 4] Dispatch send/recv time: 29.60 + 8.36 us | Combine send/recv time: 51.17 + 10.31 us

after opt：

[rank 5] Dispatch + combine bandwidth: 150.51 GB/s, avg_t=146.49 us, min_t=141.22 us, max_t=151.04 us
[rank 0] Dispatch + combine bandwidth: 150.61 GB/s, avg_t=146.39 us, min_t=142.46 us, max_t=151.30 us
[rank 4] Dispatch + combine bandwidth: 150.60 GB/s, avg_t=146.40 us, min_t=143.17 us, max_t=149.95 us
[rank 1] Dispatch + combine bandwidth: 150.70 GB/s, avg_t=146.30 us, min_t=141.25 us, max_t=151.30 us
[rank 7] Dispatch + combine bandwidth: 150.46 GB/s, avg_t=146.54 us, min_t=142.66 us, max_t=150.75 us
[rank 2] Dispatch + combine bandwidth: 150.57 GB/s, avg_t=146.43 us, min_t=143.23 us, max_t=150.21 us
[rank 6] Dispatch + combine bandwidth: 150.54 GB/s, avg_t=146.46 us, min_t=141.98 us, max_t=150.53 us
[rank 3] Dispatch + combine bandwidth: 150.67 GB/s, avg_t=146.33 us, min_t=142.43 us, max_t=150.53 us
[rank 7] Dispatch bandwidth: 130.99 GB/s, avg_t=57.34 us | Combine bandwidth: 200.77 GB/s, avg_t=72.40 us
[rank 1] Dispatch bandwidth: 130.74 GB/s, avg_t=57.46 us | Combine bandwidth: 199.87 GB/s, avg_t=72.73 us
[rank 0] Dispatch bandwidth: 130.26 GB/s, avg_t=57.67 us | Combine bandwidth: 199.67 GB/s, avg_t=72.80 us
[rank 5] Dispatch bandwidth: 131.90 GB/s, avg_t=56.95 us | Combine bandwidth: 199.32 GB/s, avg_t=72.93 us
[rank 4] Dispatch bandwidth: 130.29 GB/s, avg_t=57.65 us | Combine bandwidth: 201.46 GB/s, avg_t=72.16 us
[rank 2] Dispatch bandwidth: 130.54 GB/s, avg_t=57.54 us | Combine bandwidth: 200.89 GB/s, avg_t=72.36 us
[rank 3] Dispatch bandwidth: 123.72 GB/s, avg_t=60.72 us | Combine bandwidth: 208.88 GB/s, avg_t=69.59 us
[rank 6] Dispatch bandwidth: 129.81 GB/s, avg_t=57.87 us | Combine bandwidth: 200.89 GB/s, avg_t=72.36 us
[rank 7] Dispatch send/recv time: 20.85 + 31.38 us | Combine send/recv time: 64.06 + 10.00 us
[rank 2] Dispatch send/recv time: 21.75 + 35.04 us | Combine send/recv time: 63.83 + 10.01 us
[rank 1] Dispatch send/recv time: 21.90 + 33.83 us | Combine send/recv time: 61.35 + 9.81 us
[rank 5] Dispatch send/recv time: 21.73 + 30.19 us | Combine send/recv time: 57.54 + 9.86 us
[rank 0] Dispatch send/recv time: 22.02 + 30.42 us | Combine send/recv time: 54.38 + 9.97 us
[rank 6] Dispatch send/recv time: 21.14 + 30.60 us | Combine send/recv time: 61.88 + 9.83 us
[rank 3] Dispatch send/recv time: 21.56 + 38.61 us | Combine send/recv time: 58.21 + 9.92 us
[rank 4] Dispatch send/recv time: 21.82 + 32.01 us | Combine send/recv time: 58.74 + 9.87 us

16 rank(two node server)

before opt：

[rank 4] Dispatch bandwidth: 124.77 GB/s, avg_t=176.72 us, min_t=34.94 us, max_t=326.62 us
[rank 0] Dispatch bandwidth: 124.48 GB/s, avg_t=177.12 us, min_t=34.40 us, max_t=332.16 us
[rank 5] Dispatch bandwidth: 124.43 GB/s, avg_t=177.20 us, min_t=36.03 us, max_t=327.01 us
[rank 7] Dispatch bandwidth: 124.57 GB/s, avg_t=176.99 us, min_t=37.02 us, max_t=330.78 us
[rank 1] Dispatch bandwidth: 124.44 GB/s, avg_t=177.19 us, min_t=36.10 us, max_t=332.26 us
[rank 2] Dispatch bandwidth: 124.47 GB/s, avg_t=177.14 us, min_t=37.18 us, max_t=324.96 us
[rank 6] Dispatch bandwidth: 124.58 GB/s, avg_t=176.98 us, min_t=35.23 us, max_t=332.00 us
[rank 3] Dispatch bandwidth: 124.60 GB/s, avg_t=176.96 us, min_t=38.50 us, max_t=330.50 us
[rank 4] Dispatch bandwidth: 52.73 GB/s, avg_t=142.45 us | 
[rank 2] Dispatch bandwidth: 52.72 GB/s, avg_t=142.49 us | 
[rank 1] Dispatch bandwidth: 52.63 GB/s, avg_t=142.73 us | 
[rank 7] Dispatch bandwidth: 52.66 GB/s, avg_t=142.64 us | 
[rank 3] Dispatch bandwidth: 52.59 GB/s, avg_t=142.85 us | 
[rank 5] Dispatch bandwidth: 52.72 GB/s, avg_t=142.49 us | 
[rank 6] Dispatch bandwidth: 52.78 GB/s, avg_t=142.31 us | 
[rank 0] Dispatch bandwidth: 52.85 GB/s, avg_t=142.13 us | 
[rank 4] Dispatch send/recv time: 24.87 + 8.33 us | 
[rank 2] Dispatch send/recv time: 24.84 + 8.30 us | 
[rank 7] Dispatch send/recv time: 25.97 + 9.27 us | 
[rank 1] Dispatch send/recv time: 24.12 + 8.46 us | 
[rank 6] Dispatch send/recv time: 24.75 + 8.44 us | 
[rank 5] Dispatch send/recv time: 24.80 + 8.35 us | 
[rank 3] Dispatch send/recv time: 25.10 + 10.34 us | 
[rank 0] Dispatch send/recv time: 24.80 + 8.60 us |

after opt：

[rank 0] Dispatch + combine bandwidth: 76.63 GB/s, avg_t=287.73 us, min_t=273.79 us, max_t=317.86 us
[rank 2] Dispatch + combine bandwidth: 76.64 GB/s, avg_t=287.69 us, min_t=276.22 us, max_t=314.69 us
[rank 5] Dispatch + combine bandwidth: 76.59 GB/s, avg_t=287.87 us, min_t=269.54 us, max_t=314.62 us
[rank 7] Dispatch + combine bandwidth: 76.58 GB/s, avg_t=287.91 us, min_t=270.02 us, max_t=321.15 us
[rank 4] Dispatch + combine bandwidth: 76.55 GB/s, avg_t=288.02 us, min_t=273.31 us, max_t=320.29 us
[rank 6] Dispatch + combine bandwidth: 76.59 GB/s, avg_t=287.86 us, min_t=273.82 us, max_t=318.94 us
[rank 3] Dispatch + combine bandwidth: 76.59 GB/s, avg_t=287.87 us, min_t=272.29 us, max_t=313.57 us
[rank 1] Dispatch + combine bandwidth: 76.58 GB/s, avg_t=287.92 us, min_t=272.93 us, max_t=315.46 us
[rank 5] Dispatch bandwidth: 95.22 GB/s, avg_t=78.89 us | Combine bandwidth: 73.07 GB/s, avg_t=198.93 us
[rank 2] Dispatch bandwidth: 97.53 GB/s, avg_t=77.02 us | Combine bandwidth: 72.38 GB/s, avg_t=200.83 us
[rank 0] Dispatch bandwidth: 102.81 GB/s, avg_t=73.06 us | Combine bandwidth: 71.10 GB/s, avg_t=204.45 us
[rank 4] Dispatch bandwidth: 102.05 GB/s, avg_t=73.61 us | Combine bandwidth: 71.15 GB/s, avg_t=204.32 us
[rank 7] Dispatch bandwidth: 101.21 GB/s, avg_t=74.22 us | Combine bandwidth: 71.52 GB/s, avg_t=203.24 us
[rank 1] Dispatch bandwidth: 100.77 GB/s, avg_t=74.55 us | Combine bandwidth: 71.63 GB/s, avg_t=202.95 us
[rank 6] Dispatch bandwidth: 103.37 GB/s, avg_t=72.67 us | Combine bandwidth: 70.81 GB/s, avg_t=205.29 us
[rank 3] Dispatch bandwidth: 99.26 GB/s, avg_t=75.68 us | Combine bandwidth: 72.15 GB/s, avg_t=201.48 us
[rank 2] Dispatch send/recv time: 35.76 + 30.44 us | Combine send/recv time: 41.99 + 10.20 us
[rank 4] Dispatch send/recv time: 37.21 + 31.54 us | Combine send/recv time: 39.77 + 10.13 us
[rank 7] Dispatch send/recv time: 35.38 + 36.78 us | Combine send/recv time: 39.66 + 10.14 us
[rank 5] Dispatch send/recv time: 36.69 + 29.78 us | Combine send/recv time: 40.65 + 10.19 us
[rank 0] Dispatch send/recv time: 37.38 + 29.93 us | Combine send/recv time: 38.31 + 10.20 us
[rank 1] Dispatch send/recv time: 36.32 + 32.89 us | Combine send/recv time: 42.16 + 10.19 us
[rank 6] Dispatch send/recv time: 36.71 + 30.98 us | Combine send/recv time: 40.65 + 10.20 us
[rank 3] Dispatch send/recv time: 35.30 + 35.37 us | Combine send/recv time: 39.19 + 10.22 us

rank 24(three node server):

before opt：

[rank 7] Dispatch + combine bandwidth: 52.78 GB/s, avg_t=417.72 us, min_t=406.78 us, max_t=428.77 us
[rank 2] Dispatch + combine bandwidth: 52.80 GB/s, avg_t=417.58 us, min_t=404.42 us, max_t=433.82 us
[rank 5] Dispatch + combine bandwidth: 52.77 GB/s, avg_t=417.80 us, min_t=406.94 us, max_t=430.69 us
[rank 3] Dispatch + combine bandwidth: 52.80 GB/s, avg_t=417.55 us, min_t=404.90 us, max_t=434.14 us
[rank 1] Dispatch + combine bandwidth: 52.78 GB/s, avg_t=417.75 us, min_t=409.15 us, max_t=433.50 us
[rank 4] Dispatch + combine bandwidth: 52.80 GB/s, avg_t=417.60 us, min_t=404.80 us, max_t=436.48 us
[rank 0] Dispatch + combine bandwidth: 52.78 GB/s, avg_t=417.74 us, min_t=403.97 us, max_t=439.62 us
[rank 6] Dispatch + combine bandwidth: 52.80 GB/s, avg_t=417.56 us, min_t=403.10 us, max_t=441.09 us
[rank 2] Dispatch bandwidth: 50.05 GB/s, avg_t=150.10 us | Combine bandwidth: 56.30 GB/s, avg_t=258.22 us
[rank 1] Dispatch bandwidth: 52.12 GB/s, avg_t=144.11 us | Combine bandwidth: 54.96 GB/s, avg_t=264.50 us
[rank 3] Dispatch bandwidth: 50.96 GB/s, avg_t=147.41 us | Combine bandwidth: 55.63 GB/s, avg_t=261.33 us
[rank 5] Dispatch bandwidth: 49.03 GB/s, avg_t=153.21 us | Combine bandwidth: 56.98 GB/s, avg_t=255.13 us
[rank 6] Dispatch bandwidth: 51.94 GB/s, avg_t=144.61 us | Combine bandwidth: 55.13 GB/s, avg_t=263.69 us
[rank 0] Dispatch bandwidth: 50.73 GB/s, avg_t=148.06 us | Combine bandwidth: 55.73 GB/s, avg_t=260.85 us
[rank 4] Dispatch bandwidth: 50.70 GB/s, avg_t=148.16 us | Combine bandwidth: 55.84 GB/s, avg_t=260.35 us
[rank 7] Dispatch bandwidth: 52.29 GB/s, avg_t=143.67 us | Combine bandwidth: 54.84 GB/s, avg_t=265.09 us
[rank 2] Dispatch send/recv time: 22.09 + 8.32 us | Combine send/recv time: 24.02 + 9.97 us
[rank 7] Dispatch send/recv time: 23.92 + 8.11 us | Combine send/recv time: 24.68 + 9.96 us
[rank 1] Dispatch send/recv time: 22.74 + 8.39 us | Combine send/recv time: 24.52 + 9.98 us
[rank 6] Dispatch send/recv time: 22.50 + 8.25 us | Combine send/recv time: 23.71 + 9.77 us
[rank 3] Dispatch send/recv time: 22.58 + 9.24 us | Combine send/recv time: 24.44 + 9.97 us
[rank 4] Dispatch send/recv time: 22.85 + 9.44 us | Combine send/recv time: 24.36 + 10.02 us
[rank 5] Dispatch send/recv time: 22.66 + 10.69 us | Combine send/recv time: 26.37 + 9.95 us
[rank 0] Dispatch send/recv time: 22.78 + 8.54 us | Combine send/recv time: 25.32 + 10.01 us

after opt：

[rank 0] Dispatch + combine bandwidth: 61.06 GB/s, avg_t=361.12 us, min_t=352.35 us, max_t=372.74 us
[rank 1] Dispatch + combine bandwidth: 61.01 GB/s, avg_t=361.39 us, min_t=351.10 us, max_t=374.24 us
[rank 4] Dispatch + combine bandwidth: 61.03 GB/s, avg_t=361.27 us, min_t=353.57 us, max_t=373.47 us
[rank 6] Dispatch + combine bandwidth: 61.00 GB/s, avg_t=361.45 us, min_t=351.17 us, max_t=369.22 us
[rank 5] Dispatch + combine bandwidth: 61.01 GB/s, avg_t=361.36 us, min_t=350.78 us, max_t=382.82 us
[rank 3] Dispatch + combine bandwidth: 61.04 GB/s, avg_t=361.24 us, min_t=351.74 us, max_t=374.56 us
[rank 2] Dispatch + combine bandwidth: 61.01 GB/s, avg_t=361.40 us, min_t=351.74 us, max_t=373.12 us
[rank 7] Dispatch + combine bandwidth: 61.03 GB/s, avg_t=361.28 us, min_t=353.54 us, max_t=373.38 us
[rank 4] Dispatch bandwidth: 82.83 GB/s, avg_t=90.69 us | Combine bandwidth: 54.76 GB/s, avg_t=265.48 us
[rank 5] Dispatch bandwidth: 78.13 GB/s, avg_t=96.14 us | Combine bandwidth: 55.96 GB/s, avg_t=259.79 us
[rank 1] Dispatch bandwidth: 86.82 GB/s, avg_t=86.52 us | Combine bandwidth: 54.02 GB/s, avg_t=269.10 us
[rank 0] Dispatch bandwidth: 81.45 GB/s, avg_t=92.23 us | Combine bandwidth: 54.60 GB/s, avg_t=266.25 us
[rank 6] Dispatch bandwidth: 84.37 GB/s, avg_t=89.04 us | Combine bandwidth: 54.43 GB/s, avg_t=267.06 us
[rank 2] Dispatch bandwidth: 81.92 GB/s, avg_t=91.70 us | Combine bandwidth: 55.26 GB/s, avg_t=263.05 us
[rank 3] Dispatch bandwidth: 82.37 GB/s, avg_t=91.19 us | Combine bandwidth: 55.23 GB/s, avg_t=263.22 us
[rank 7] Dispatch bandwidth: 84.25 GB/s, avg_t=89.16 us | Combine bandwidth: 54.47 GB/s, avg_t=266.87 us
[rank 6] Dispatch send/recv time: 38.72 + 30.30 us | Combine send/recv time: 34.87 + 10.26 us
[rank 1] Dispatch send/recv time: 40.55 + 31.63 us | Combine send/recv time: 35.84 + 10.32 us
[rank 4] Dispatch send/recv time: 39.12 + 36.25 us | Combine send/recv time: 33.65 + 10.10 us
[rank 5] Dispatch send/recv time: 37.35 + 35.85 us | Combine send/recv time: 33.42 + 10.13 us
[rank 0] Dispatch send/recv time: 39.23 + 30.46 us | Combine send/recv time: 32.34 + 10.21 us
[rank 3] Dispatch send/recv time: 38.59 + 36.25 us | Combine send/recv time: 34.79 + 10.17 us
[rank 2] Dispatch send/recv time: 37.19 + 31.72 us | Combine send/recv time: 34.42 + 10.15 us
[rank 7] Dispatch send/recv time: 37.80 + 30.44 us | Combine send/recv time: 34.40 + 10.11 us

rank 32(4 node server):

before opt：

[rank 0] Dispatch + combine bandwidth: 47.20 GB/s, avg_t=467.13 us, min_t=456.80 us, max_t=481.44 us
[rank 7] Dispatch + combine bandwidth: 47.18 GB/s, avg_t=467.37 us, min_t=460.48 us, max_t=481.63 us
[rank 6] Dispatch + combine bandwidth: 47.18 GB/s, avg_t=467.33 us, min_t=459.87 us, max_t=479.71 us
[rank 1] Dispatch + combine bandwidth: 47.17 GB/s, avg_t=467.43 us, min_t=455.14 us, max_t=483.87 us
[rank 3] Dispatch + combine bandwidth: 47.18 GB/s, avg_t=467.36 us, min_t=458.69 us, max_t=480.58 us
[rank 2] Dispatch + combine bandwidth: 47.17 GB/s, avg_t=467.40 us, min_t=457.70 us, max_t=478.40 us
[rank 4] Dispatch + combine bandwidth: 47.18 GB/s, avg_t=467.37 us, min_t=454.30 us, max_t=481.31 us
[rank 5] Dispatch + combine bandwidth: 47.17 GB/s, avg_t=467.42 us, min_t=457.76 us, max_t=481.92 us
[rank 7] Dispatch bandwidth: 47.98 GB/s, avg_t=156.56 us | Combine bandwidth: 48.54 GB/s, avg_t=299.46 us
[rank 0] Dispatch bandwidth: 47.39 GB/s, avg_t=158.50 us | Combine bandwidth: 48.93 GB/s, avg_t=297.11 us
[rank 4] Dispatch bandwidth: 45.54 GB/s, avg_t=164.94 us | Combine bandwidth: 49.98 GB/s, avg_t=290.82 us
[rank 3] Dispatch bandwidth: 44.43 GB/s, avg_t=169.08 us | Combine bandwidth: 50.71 GB/s, avg_t=286.66 us
[rank 6] Dispatch bandwidth: 46.97 GB/s, avg_t=159.91 us | Combine bandwidth: 49.10 GB/s, avg_t=296.04 us
[rank 2] Dispatch bandwidth: 46.91 GB/s, avg_t=160.13 us | Combine bandwidth: 49.20 GB/s, avg_t=295.49 us
[rank 1] Dispatch bandwidth: 46.35 GB/s, avg_t=162.06 us | Combine bandwidth: 49.48 GB/s, avg_t=293.81 us
[rank 5] Dispatch bandwidth: 46.52 GB/s, avg_t=161.46 us | Combine bandwidth: 49.37 GB/s, avg_t=294.46 us
[rank 7] Dispatch send/recv time: 22.78 + 9.58 us | Combine send/recv time: 23.44 + 10.01 us
[rank 6] Dispatch send/recv time: 21.31 + 10.28 us | Combine send/recv time: 26.27 + 9.97 us
[rank 1] Dispatch send/recv time: 21.44 + 8.13 us | Combine send/recv time: 22.45 + 9.90 us
[rank 2] Dispatch send/recv time: 21.87 + 8.18 us | Combine send/recv time: 21.80 + 10.04 us
[rank 0] Dispatch send/recv time: 21.69 + 8.47 us | Combine send/recv time: 23.05 + 9.84 us
[rank 3] Dispatch send/recv time: 21.49 + 8.38 us | Combine send/recv time: 22.37 + 10.01 us
[rank 5] Dispatch send/recv time: 21.89 + 8.29 us | Combine send/recv time: 22.24 + 9.94 us
[rank 4] Dispatch send/recv time: 21.71 + 9.44 us | Combine send/recv time: 23.14 + 10.03 us

after opt：

[rank 0] Dispatch + combine bandwidth: 53.28 GB/s, avg_t=413.80 us, min_t=405.44 us, max_t=422.08 us
[rank 4] Dispatch + combine bandwidth: 53.25 GB/s, avg_t=414.04 us, min_t=400.58 us, max_t=427.94 us
[rank 7] Dispatch + combine bandwidth: 53.28 GB/s, avg_t=413.84 us, min_t=400.03 us, max_t=428.93 us
[rank 6] Dispatch + combine bandwidth: 53.29 GB/s, avg_t=413.73 us, min_t=405.22 us, max_t=425.98 us
[rank 3] Dispatch + combine bandwidth: 53.28 GB/s, avg_t=413.81 us, min_t=404.54 us, max_t=423.52 us
[rank 5] Dispatch + combine bandwidth: 53.26 GB/s, avg_t=413.97 us, min_t=405.09 us, max_t=422.56 us
[rank 2] Dispatch + combine bandwidth: 53.25 GB/s, avg_t=414.02 us, min_t=407.26 us, max_t=421.98 us
[rank 1] Dispatch + combine bandwidth: 53.25 GB/s, avg_t=414.05 us, min_t=399.81 us, max_t=431.62 us
[rank 4] Dispatch bandwidth: 68.90 GB/s, avg_t=109.02 us | Combine bandwidth: 48.84 GB/s, avg_t=297.64 us
[rank 3] Dispatch bandwidth: 65.03 GB/s, avg_t=115.51 us | Combine bandwidth: 50.20 GB/s, avg_t=289.57 us
[rank 1] Dispatch bandwidth: 68.48 GB/s, avg_t=109.69 us | Combine bandwidth: 49.13 GB/s, avg_t=295.88 us
[rank 2] Dispatch bandwidth: 70.58 GB/s, avg_t=106.42 us | Combine bandwidth: 48.60 GB/s, avg_t=299.12 us
[rank 6] Dispatch bandwidth: 68.83 GB/s, avg_t=109.14 us | Combine bandwidth: 49.02 GB/s, avg_t=296.58 us
[rank 5] Dispatch bandwidth: 66.80 GB/s, avg_t=112.45 us | Combine bandwidth: 49.49 GB/s, avg_t=293.72 us
[rank 7] Dispatch bandwidth: 72.37 GB/s, avg_t=103.80 us | Combine bandwidth: 48.22 GB/s, avg_t=301.46 us
[rank 0] Dispatch bandwidth: 68.94 GB/s, avg_t=108.96 us | Combine bandwidth: 48.46 GB/s, avg_t=299.97 us
[rank 5] Dispatch send/recv time: 40.07 + 29.81 us | Combine send/recv time: 29.81 + 10.20 us
[rank 3] Dispatch send/recv time: 40.86 + 31.51 us | Combine send/recv time: 31.53 + 10.11 us
[rank 4] Dispatch send/recv time: 41.47 + 36.13 us | Combine send/recv time: 32.43 + 10.25 us
[rank 6] Dispatch send/recv time: 41.31 + 40.32 us | Combine send/recv time: 35.72 + 10.06 us
[rank 1] Dispatch send/recv time: 41.63 + 32.59 us | Combine send/recv time: 33.85 + 10.09 us
[rank 7] Dispatch send/recv time: 40.06 + 36.35 us | Combine send/recv time: 34.64 + 10.12 us
[rank 2] Dispatch send/recv time: 40.58 + 31.48 us | Combine send/recv time: 35.93 + 10.08 us
[rank 0] Dispatch send/recv time: 41.50 + 30.18 us | Combine send/recv time: 30.64 + 10.09 us

rank 48(6 node server)

before opt：

[rank 0] Dispatch + combine bandwidth: 43.31 GB/s, avg_t=509.13 us, min_t=493.89 us, max_t=527.23 us
[rank 5] Dispatch + combine bandwidth: 43.32 GB/s, avg_t=508.98 us, min_t=494.18 us, max_t=525.98 us
[rank 1] Dispatch + combine bandwidth: 43.29 GB/s, avg_t=509.31 us, min_t=493.25 us, max_t=530.11 us
[rank 7] Dispatch + combine bandwidth: 43.31 GB/s, avg_t=509.12 us, min_t=496.32 us, max_t=532.03 us
[rank 4] Dispatch + combine bandwidth: 43.32 GB/s, avg_t=508.95 us, min_t=497.41 us, max_t=527.04 us
[rank 2] Dispatch + combine bandwidth: 43.30 GB/s, avg_t=509.17 us, min_t=497.47 us, max_t=531.46 us
[rank 6] Dispatch + combine bandwidth: 43.30 GB/s, avg_t=509.25 us, min_t=493.25 us, max_t=532.42 us
[rank 3] Dispatch + combine bandwidth: 43.30 GB/s, avg_t=509.21 us, min_t=495.78 us, max_t=533.66 us
[rank 4] Dispatch bandwidth: 43.16 GB/s, avg_t=174.05 us | Combine bandwidth: 44.37 GB/s, avg_t=327.61 us
[rank 3] Dispatch bandwidth: 42.39 GB/s, avg_t=177.19 us | Combine bandwidth: 45.09 GB/s, avg_t=322.36 us
[rank 0] Dispatch bandwidth: 42.64 GB/s, avg_t=176.16 us | Combine bandwidth: 44.47 GB/s, avg_t=326.86 us
[rank 2] Dispatch bandwidth: 42.44 GB/s, avg_t=176.98 us | Combine bandwidth: 45.00 GB/s, avg_t=323.02 us
[rank 5] Dispatch bandwidth: 41.15 GB/s, avg_t=182.56 us | Combine bandwidth: 45.67 GB/s, avg_t=318.33 us
[rank 6] Dispatch bandwidth: 41.67 GB/s, avg_t=180.25 us | Combine bandwidth: 45.31 GB/s, avg_t=320.83 us
[rank 7] Dispatch bandwidth: 43.40 GB/s, avg_t=173.06 us | Combine bandwidth: 44.58 GB/s, avg_t=326.06 us
[rank 1] Dispatch bandwidth: 42.50 GB/s, avg_t=176.75 us | Combine bandwidth: 44.90 GB/s, avg_t=323.79 us
[rank 5] Dispatch send/recv time: 20.77 + 8.57 us | Combine send/recv time: 21.94 + 10.22 us
[rank 7] Dispatch send/recv time: 21.43 + 8.36 us | Combine send/recv time: 21.87 + 10.09 us
[rank 4] Dispatch send/recv time: 20.83 + 8.24 us | Combine send/recv time: 22.26 + 10.10 us
[rank 2] Dispatch send/recv time: 20.31 + 9.28 us | Combine send/recv time: 24.11 + 9.90 us
[rank 3] Dispatch send/recv time: 20.77 + 8.51 us | Combine send/recv time: 22.74 + 10.13 us
[rank 6] Dispatch send/recv time: 20.36 + 9.27 us | Combine send/recv time: 24.15 + 10.04 us
[rank 0] Dispatch send/recv time: 20.71 + 8.62 us | Combine send/recv time: 23.05 + 10.17 us
[rank 1] Dispatch send/recv time: 20.61 + 8.45 us | Combine send/recv time: 21.61 + 10.11 us

after opt：

[rank 0] Dispatch + combine bandwidth: 47.09 GB/s, avg_t=468.18 us, min_t=453.57 us, max_t=482.69 us
[rank 2] Dispatch + combine bandwidth: 47.08 GB/s, avg_t=468.34 us, min_t=456.19 us, max_t=482.88 us
[rank 6] Dispatch + combine bandwidth: 47.06 GB/s, avg_t=468.48 us, min_t=449.06 us, max_t=492.03 us
[rank 3] Dispatch + combine bandwidth: 47.09 GB/s, avg_t=468.18 us, min_t=448.45 us, max_t=495.81 us
[rank 1] Dispatch + combine bandwidth: 47.09 GB/s, avg_t=468.23 us, min_t=453.15 us, max_t=483.42 us
[rank 5] Dispatch + combine bandwidth: 47.10 GB/s, avg_t=468.15 us, min_t=456.00 us, max_t=484.96 us
[rank 7] Dispatch + combine bandwidth: 47.07 GB/s, avg_t=468.39 us, min_t=455.07 us, max_t=482.78 us
[rank 4] Dispatch + combine bandwidth: 47.08 GB/s, avg_t=468.36 us, min_t=457.44 us, max_t=480.29 us
[rank 3] Dispatch bandwidth: 54.78 GB/s, avg_t=137.14 us | Combine bandwidth: 45.38 GB/s, avg_t=320.36 us
[rank 6] Dispatch bandwidth: 55.32 GB/s, avg_t=135.78 us | Combine bandwidth: 45.19 GB/s, avg_t=321.69 us
[rank 2] Dispatch bandwidth: 57.95 GB/s, avg_t=129.63 us | Combine bandwidth: 44.34 GB/s, avg_t=327.86 us
[rank 4] Dispatch bandwidth: 59.01 GB/s, avg_t=127.30 us | Combine bandwidth: 44.03 GB/s, avg_t=330.19 us
[rank 0] Dispatch bandwidth: 57.99 GB/s, avg_t=129.54 us | Combine bandwidth: 44.27 GB/s, avg_t=328.40 us
[rank 7] Dispatch bandwidth: 56.65 GB/s, avg_t=132.59 us | Combine bandwidth: 44.70 GB/s, avg_t=325.24 us
[rank 5] Dispatch bandwidth: 55.44 GB/s, avg_t=135.50 us | Combine bandwidth: 45.19 GB/s, avg_t=321.68 us
[rank 1] Dispatch bandwidth: 57.05 GB/s, avg_t=131.66 us | Combine bandwidth: 44.56 GB/s, avg_t=326.24 us
[rank 3] Dispatch send/recv time: 41.92 + 31.73 us | Combine send/recv time: 32.13 + 10.40 us
[rank 6] Dispatch send/recv time: 42.99 + 38.89 us | Combine send/recv time: 31.89 + 45.06 us
[rank 2] Dispatch send/recv time: 44.40 + 38.51 us | Combine send/recv time: 33.25 + 21.76 us
[rank 4] Dispatch send/recv time: 42.82 + 33.35 us | Combine send/recv time: 31.29 + 26.30 us
[rank 5] Dispatch send/recv time: 41.30 + 30.58 us | Combine send/recv time: 29.54 + 18.60 us
[rank 0] Dispatch send/recv time: 46.85 + 29.57 us | Combine send/recv time: 28.81 + 10.28 us
[rank 1] Dispatch send/recv time: 44.60 + 31.38 us | Combine send/recv time: 31.33 + 10.24 us
[rank 7] Dispatch send/recv time: 42.05 + 34.21 us | Combine send/recv time: 32.31 + 37.02 us

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@alpha-baby