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Llama 4 rotary position embedding · seq = 2048 · hidden = 512 · q_heads = 32 · kv_heads = 8 · bf16 · run 01a0202b-232e…
●passedReported evidence

Not re-observed recently.

Primary measurement
137.6µsmedian

Rank 1 in its comparison group · source-native comparison · observed 2025-08-07

ms 20 0.13574400544166565 · ms 50 0.13760000467300415 · ms 80 0.14009599387645721

Identity
implementationTransformers
projectHugging Face Transformers
revisionunknown
workloadseq = 2048 · hidden = 512 · q_heads = 32 · kv_heads = 8 · bf16
comparison keysha256:ea6528bdd3143a05…
sourceLiger-Kernel benchmarks
external idllama4_rope/backward/huggingface/nvidia-h100-80gb-hbm3/hidden512-kv_heads8-q_heads32-seq2048-bf16/2025-08-07-21-42-05
sha256:25db306e59314b8ce178e51…

Correctness

Marked passed by the source; the correctness policy was not published.

Workload

seq2048
hidden512
q_heads32
kv_heads8
kbf16 [1, 2048, 8, 16]
qbf16 [1, 2048, 32, 16]
definition comparatornot_asserted

Measurements

latency · median137.6 µs
latency · p20135.7 µs
latency · p80140.1 µs

Protocol

harnessLiger-Kernel benchmark scripts
timercuda_events
primaryStatisticmedian
comparabilityFamilyliger_kernel_bench

Environment

gpuNVIDIA H100 (sm_90)

Artifacts

No artifacts published with this run.

Replications and notes

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Canonical manifest

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{
  "run": {
    "kind": "BenchmarkRun",
    "spec": {
      "status": "passed",
      "timing": {
        "latencyNs": {
          "median": 137600
        },
        "primaryStatistic": "median"
      },
      "observedAt": "2025-08-07T21:42:05.000Z",
      "measurements": [
        {
          "unit": "ns",
          "value": 135744,
          "metric": "latency",
          "statistic": "p20"
        },
        {
          "unit": "ns",
          "value": 140096,
          "metric": "latency",
          "statistic": "p80"
        }
      ],
      "sourceNative": {
        "source": "liger-kernel-bench",
        "metrics": {
          "ms_20": 0.13574400544166565,
          "ms_50": 0.13760000467300415,
          "ms_80": 0.14009599387645721
        },
        "benchmark": "llama4_rope/backward",
        "externalId": "llama4_rope/backward/huggingface/nvidia-h100-80gb-hbm3/hidden512-kv_heads8-q_heads32-seq2048-bf16/2025-08-07-21-42-05"
      },
      "protocolDigest": "sha256:080e6e66e4ec75a131aa0c9121c74b8e8eed64e7b6d621d567c6a28f79548be8",
      "workloadDigest": "sha256:98c5e76b9fa318ddeea51b56d90bc6fb39d72e404e2d01dbb467e67f57ff63e8",
      "environmentDigest": "sha256:2750ae381d6de582f1eb6b9008e0987463d19ede8af127d97d76c5ae09121393",
      "implementationDigest": "sha256:cca024409163839a832c1d39bd301f536494b645171665d65fae5faf2717be48"
    },
    "metadata": {
      "name": "liger-llama4-rope-backward-huggingface-nvidia-h100-80gb-hbm3-hidden512-kv-heads8-q-heads32-seq2048-b",
      "title": "Llama 4 rotary position embedding · huggingface · backward",
      "labels": {
        "liger_version": "0.6.1"
      }
    },
    "apiVersion": "kernelindex.dev/v1alpha1"
  },
  "protocol": {
    "kind": "BenchmarkProtocol",
    "spec": {
      "harness": {
        "name": "Liger-Kernel benchmark scripts",
        "repository": "https://github.com/linkedin/Liger-Kernel"
      },
      "measurement": {
        "timer": "cuda_events",
        "primaryStatistic": "median"
      },
      "comparability": {
        "notes": "Timed: the backward pass of the module output given a random upstream gradient, via triton.testing.do_bench with quantiles 0.5/0.2/0.8 (median with p20/p80 spread). The upstream CSV records no CUDA, driver, or torch version; the Liger release rides each run's labels. Comparable only within one kernel, workload, timed pass, and GPU.",
        "family": "liger_kernel_bench"
      }
    },
    "metadata": {
      "name": "liger-bench-do-bench-backward",
      "title": "Liger benchmark harness · backward pass"
    },
    "apiVersion": "kernelindex.dev/v1alpha1"
  },
  "environment": {
    "kind": "ExecutionEnvironment",
    "spec": {
      "hardware": {
        "vendor": "nvidia",
        "product": "NVIDIA H100",
        "formFactor": "80GB HBM3",
        "architecture": "sm_90"
      },
      "software": {}
    },
    "metadata": {
      "name": "liger-bench-nvidia-h100-80gb-hbm3",
      "title": "Liger benchmark host · H100 80GB HBM3"
    },
    "apiVersion": "kernelindex.dev/v1alpha1"
  }
}
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