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sglang-xpu-bench

Benchmark a **running SGLang-XPU server** on an Intel GPU using `sglang.bench_serving`. Measures TTFT, TPOT, ITL, end-to-end latency, and throughput against the OpenAI-compatible endpoint. Use after sglang-xpu-run. Not for vLLM servers (use vllm-xpu-bench) or no-server PyTorch (u

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Vue d’ensemble

Benchmark a **running SGLang-XPU server** on an Intel GPU using `sglang.bench_serving`. Measures TTFT, TPOT, ITL, end-to-end latency, and throughput against the OpenAI-compatible endpoint. Use after sglang-xpu-run. Not for vLLM servers (use vllm-xpu-bench) or no-server PyTorch (use torch-xpu-bench).

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sglang-xpu-bench

sglang.bench_serving is SGLang's online benchmark client (the counterpart to vllm bench serve). Speaks the OpenAI-compatible API exposed by sglang-xpu-run.

Step 0 — verify SGLang server is running on Intel XPU

REQUIRED: Before benchmarking, you must confirm a SGLang server is running, identify its port, and verify it's using Intel XPU (not CPU fallback, not NVIDIA). This prevents benchmarking a server that silently fell back to CPU.

Run the checks below in a single shell session (later blocks reuse $SGLANG_PID, $SGLANG_PORT, $MODEL from earlier ones).

Find the server process and its container:

# 1. Check if SGLang is running and find its container
SGLANG_PID=$(ps aux | grep -iE 'sglang|launch_server' | grep -v grep | awk 'NR==1 {print $2}')
if [ -z "$SGLANG_PID" ]; then
    echo "❌ No SGLang server found running. Start one with sglang-xpu-run."
    exit 1
fi
echo "✓ SGLang server found (PID: $SGLANG_PID)"

CONTAINER_NAME=$(docker ps --format '{{.Names}}' 2>/dev/null | while read name; do
    if docker top "$name" -o pid 2>/dev/null | awk 'NR>1' | grep -qxF "$SGLANG_PID"; then echo "$name"; break; fi
done)
if [ -z "$CONTAINER_NAME" ]; then
    echo "❌ No container matched PID $SGLANG_PID. This skill runs the bench client"
    echo "   via 'docker exec' because the sglang package is only installed inside"
    echo "   the server container. A host-only SGLang install is not supported here."
    exit 1
fi
echo "✓ SGLang container: $CONTAINER_NAME"

Read the launch args once — they give you both the container-internal port and the --device flag. The bench client runs via docker exec inside the container, so the port must be the one SGLang binds inside the container (host ss can't see the container-namespaced socket). The --device xpu check is REQUIRED — it catches a server that silently fell back to CPU:

# 2. Read port + device from the launch args in one pass (REQUIRED)
ARGS=$(ps -p "$SGLANG_PID" -o args=)
SGLANG_PORT=$(echo "$ARGS" | awk '{for(i=1;i<=NF;i++) if($i=="--port" && i<NF) print $(i+1)}' | head -1)
SGLANG_PORT=${SGLANG_PORT:-30000}   # sglang default
DEVICE_ARG=$(echo "$ARGS" | awk '{for(i=1;i<=NF;i++) if($i=="--device" && i<NF) print $(i+1)}' | head -1)
echo "DEVICE_ARG=${DEVICE_ARG:-none}"
if [ "$DEVICE_ARG" = "cuda" ]; then
    echo "❌ Server is on NVIDIA CUDA, not Intel XPU."; exit 1
elif [ "$DEVICE_ARG" = "xpu" ]; then
    echo "✓ SGLang server has --device xpu"
else
    echo "⚠️  Could not confirm --device xpu (got: '${DEVICE_ARG:-none}'); relying on XPU memory check."
fi

# 3. Verify reachable from inside the container and read model name
if ! docker exec "$CONTAINER_NAME" curl -s http://127.0.0.1:$SGLANG_PORT/v1/models >/dev/null 2>&1; then
    echo "❌ SGLang server not responding on container port $SGLANG_PORT."
    exit 1
fi
MODEL=$(docker exec "$CONTAINER_NAME" curl -s http://127.0.0.1:$SGLANG_PORT/v1/models | python3 -c "import sys,json; print(json.load(sys.stdin)['data'][0]['id'])")
echo "✓ Responding on container port $SGLANG_PORT — model: $MODEL"

Reject NVIDIA GPU usage, then confirm XPU memory is in use (rules out CPU fallback):

# 4a. Reject NVIDIA GPU usage — scan only the compute-app PID list and match
# the whole line, so a short PID can't collide with memory/temp/other numbers
# elsewhere in nvidia-smi's output.
if command -v nvidia-smi >/dev/null 2>&1 && \
   nvidia-smi --query-compute-apps=pid --format=csv,noheader 2>/dev/null \
     | tr -d ' ' | grep -qxF "$SGLANG_PID"; then
    echo "❌ Server is running on NVIDIA GPU, not Intel XPU."; exit 1
fi

# 4b. Verify Intel XPU memory usage — -m 18 = "GPU Memory Used (MiB)", CSV output
GPU_COUNT=$(xpu-smi discovery 2>/dev/null | grep -cE "^\| +[0-9]|Device [0-9]+:")
[ "${GPU_COUNT:-0}" -gt 0 ] || GPU_COUNT=1
XPU_IN_USE=0
for id in $(seq 0 $((GPU_COUNT - 1))); do
    MEM_USED=$(xpu-smi dump -d "$id" -m 18 -i 1 -n 1 2>/dev/null | awk -F',' 'NR==2 {gsub(/ /,"",$NF); print int($NF)}')
    echo "  Device $id: ${MEM_USED:-0} MiB"
    [ "${MEM_USED:-0}" -gt 500 ] && XPU_IN_USE=1
done
if [ "$XPU_IN_USE" -eq 0 ]; then
    echo "❌ XPU memory near zero — server may have fallen back to CPU. Restart with --device xpu."
    exit 1
fi
echo "✓ SGLang is confirmed running on Intel XPU"

Everything needed for the benchmark is now confirmed:

# 5. Summary — CONTAINER_NAME, SGLANG_PORT, MODEL were set above
echo "=== Ready to benchmark === Port: $SGLANG_PORT  Model: $MODEL  Container: $CONTAINER_NAME"

If no SGLang server is found, if it's running on NVIDIA instead of Intel XPU, or if it's fallen back to CPU, the checks exit with guidance.

Metrics

  • TTFT — wall time to first generated token.
  • TPOT — mean per-token time after the first.
  • ITL — per-token inter-arrival; percentiles meaningful for latency SLAs.
  • E2EL — wall time of one request.
  • Throughput — output_tokens / wall_seconds.

Prerequisites

A running SGLang-XPU server (per sglang-xpu-run). Step 0 above will verify the server is running, identify its port, and confirm it's using Intel XPU.

Note on ALL_PROXY: if the host has ALL_PROXY=socks://... set, the bench client's HTTP requests may be routed through the SOCKS proxy. Unset it before benching a local server:

unset ALL_PROXY all_proxy

Online bench

Important: The benchmark client must run inside the same container where the SGLang server is running. The sglang package is only installed in the container environment, not on the host.

Always use docker exec (not nsenter) to run benchmarks. The nsenter approach is fragile and can hang when other processes are stalled.

Verify from inside the container. Output files are written inside the container filesystem. To verify or read results, use docker exec "$CONTAINER_NAME" cat "$OUT", not host cat.

Always write to a unique output file per run. --output-file appends, so reusing a name mixes runs — and a stale file from a prior run can trick you into reading old results instead of running the benchmark. Derive a RUN_TAG from the date and shell PID.

Use the $SGLANG_PORT, $MODEL, and $CONTAINER_NAME discovered in Step 0:

# Discover conda activate path (may differ on forked images)
CONDA_SH=$(docker exec "$CONTAINER_NAME" sh -c 'find /home /root /opt -maxdepth 5 -name activate -path "*/miniforge*/bin/activate" 2>/dev/null | head -1')

# Unique per-run output file so a stale file can't be mistaken for fresh output:
RUN_TAG=$(date +%Y%m%d-%H%M%S)-$$
OUT="/tmp/bench-${RUN_TAG}.jsonl"

# Run benchmark inside the server container (where sglang is installed):
docker exec -it "$CONTAINER_NAME" bash -c "
. $CONDA_SH && conda activate py3.12 &&
python3 -m sglang.bench_serving \
    --backend sglang-oai-chat \
    --host 127.0.0.1 --port $SGLANG_PORT \
    --model $MODEL \
    --dataset-name random \
    --random-input-len 512 --random-output-len 128 \
    --num-prompts 200 \
    --max-concurrency 8 \
    --output-file $OUT
"

# Read results from inside the container:
docker exec "$CONTAINER_NAME" cat "$OUT"

Flag rationales:

  • --backend sglang-oai-chat → /v1/chat/completions. Use sglang-oai for /v1/completions; sglang for the native API. Match your server.
  • --dataset-name random — synthetic, deterministic at the same --seed, no network. Use sharegpt for realistic prompt distribution.
  • --random-input-len / --random-output-len — fix lengths for reproducible sweeps.
  • --num-prompts — aim for >= 5 × max-concurrency for steady state.
  • --max-concurrency — sweep to find the throughput knee.
  • --request-rate inf (default) — issue all immediately. Pass a finite qps for Poisson arrivals (e.g. --request-rate 4).
  • --output-file — append-only JSONL; always use a unique name per run (e.g. the RUN_TAG above) so stale files aren't mistaken for fresh results.

Concurrency sweep

Auto-sizes from GPU count to find the throughput knee. Uses the $SGLANG_PORT, $MODEL, and $CONTAINER_NAME from Step 0:

GPU_COUNT=$(xpu-smi discovery 2>/dev/null | grep -cE "^\| +[0-9]|Device [0-9]+:")
[ "${GPU_COUNT:-0}" -gt 0 ] || GPU_COUNT=1
CONDA_SH=$(docker exec "$CONTAINER_NAME" sh -c 'find /home /root /opt -maxdepth 5 -name activate -path "*/miniforge*/bin/activate" 2>/dev/null | head -1')
RUN_TAG=$(date +%Y%m%d-%H%M%S)-$$   # unique per sweep; files are /tmp/bench-${RUN_TAG}-c<N>.jsonl

docker exec -it "$CONTAINER_NAME" bash -c "
. $CONDA_SH && conda activate py3.12
for c in $(printf '%s\n' 1 2 4 8 $((GPU_COUNT * 8)) $((GPU_COUNT * 16)) | sort -nu | tr '\n' ' '); do
    echo \"--- concurrency \$c ---\"
    python3 -m sglang.bench_serving \
        --backend sglang-oai-chat \
        --host 127.0.0.1 --port $SGLANG_PORT \
        --model $MODEL \
        --dataset-name random \
        --random-input-len 512 --random-output-len 128 \
        --num-prompts \$((c * 25)) \
        --max-concurrency \$c \
        --output-file /tmp/bench-${RUN_TAG}-c\${c}.jsonl
done
"

Knee = throughput plateaus while p99 TPOT climbs. Beyond it, latency degrades without throughput gain.

Comparing two runs

python3 - baseline.jsonl candidate.jsonl <<'PY'
import json, sys

def last(path):
    with open(path) as f:
        lines = [l for l in f if l.strip()]
    return json.loads(lines[-1])

a, b = last(sys.argv[1]), last(sys.argv[2])
for k in ("mean_ttft_ms","p99_ttft_ms","mean_tpot_ms","p99_tpot_ms",
          "request_throughput","output_throughput"):
    print(f"{k:28s}  base={a.get(k,0):.2f}  cand={b.get(k,0):.2f}"
          f"  delta={b.get(k,0)-a.get(k,0):+.2f}")
PY

5% regression on output_throughput or >10% on p99_tpot_ms is real. Smaller is noise.

RadixAttention prefix-cache benchmark

The main sglang-vs-vllm differentiator on Intel. With caching on (sglang's default), repeated prefixes hit the RadixAttention cache and TTFT drops sharply on subsequent requests. Runs inside the server container (where sglang is installed), using $SGLANG_PORT, $MODEL, and $CONTAINER_NAME from Step 0:

CONDA_SH=$(docker exec "$CONTAINER_NAME" sh -c 'find /home /root /opt -maxdepth 5 -name activate -path "*/miniforge*/bin/activate" 2>/dev/null | head -1')
# Unique per-run tag so a rerun's files don't append onto a stale one:
RUN_TAG=$(date +%Y%m%d-%H%M%S)-$$

# Cache-on run (sglang default), inside the container:
docker exec -it "$CONTAINER_NAME" bash -c "
. $CONDA_SH && conda activate py3.12 &&
python3 -m sglang.bench_serving \
    --backend sglang-oai-chat \
    --host 127.0.0.1 --port $SGLANG_PORT \
    --model $MODEL \
    --dataset-name random \
    --random-input-len 1024 --random-output-len 64 \
    --num-prompts 500 --max-concurrency 8 \
    --random-range-ratio 0.1 \
    --output-file /tmp/cache-on-${RUN_TAG}.jsonl
"

# Read results from inside the container:
docker exec "$CONTAINER_NAME" cat /tmp/cache-on-${RUN_TAG}.jsonl

# Cache-off baseline (restart server with --disable-radix-cache), then re-run
# the docker exec above with --output-file /tmp/cache-off-${RUN_TAG}.jsonl

--random-range-ratio 0.1 → suffixes vary in only the last 10% of tokens (high prefix overlap, simulates shared-prompt workloads). TTFT delta between runs is the prefix-cache win.

Validating quantized serving

HTTP 200 + plausible throughput don't imply correct output. For any quantized model, before trusting numbers:

  1. Capture per-request responses: add --output-details to the bench.
  2. Read 2–3 sample completions; confirm they parse as language.
  3. If non-language, see sglang-xpu-run's Quanti
Voir la source ↗
Métadonnées du fichier
name: sglang-xpu-bench
description: Benchmark a **running SGLang-XPU server** on an Intel GPU using `sglang.bench_serving`. Measures TTFT, TPOT, ITL, end-to-end latency, and throughput against the OpenAI-compatible endpoint. Use after sglang-xpu-run. Not for vLLM servers (use vllm-xpu-bench) or no-server PyTorch (use torch-xpu-bench).
Voir le texte original
---
name: sglang-xpu-bench
description: Benchmark a **running SGLang-XPU server** on an Intel GPU using `sglang.bench_serving`. Measures TTFT, TPOT, ITL, end-to-end latency, and throughput against the OpenAI-compatible endpoint. Use after sglang-xpu-run. Not for vLLM servers (use vllm-xpu-bench) or no-server PyTorch (use torch-xpu-bench).
---

# sglang-xpu-bench

`sglang.bench_serving` is SGLang's online benchmark client (the
counterpart to `vllm bench serve`). Speaks the OpenAI-compatible API
exposed by **sglang-xpu-run**.

## Step 0 — verify SGLang server is running on Intel XPU

**REQUIRED**: Before benchmarking, you must confirm a SGLang server is running,
identify its port, and verify it's using Intel XPU (not CPU fallback, not NVIDIA).
This prevents benchmarking a server that silently fell back to CPU.

Run the checks below **in a single shell session** (later blocks reuse
`$SGLANG_PID`, `$SGLANG_PORT`, `$MODEL` from earlier ones).

Find the server process and its container:

```sh
# 1. Check if SGLang is running and find its container
SGLANG_PID=$(ps aux | grep -iE 'sglang|launch_server' | grep -v grep | awk 'NR==1 {print $2}')
if [ -z "$SGLANG_PID" ]; then
    echo "❌ No SGLang server found running. Start one with sglang-xpu-run."
    exit 1
fi
echo "✓ SGLang server found (PID: $SGLANG_PID)"

CONTAINER_NAME=$(docker ps --format '{{.Names}}' 2>/dev/null | while read name; do
    if docker top "$name" -o pid 2>/dev/null | awk 'NR>1' | grep -qxF "$SGLANG_PID"; then echo "$name"; break; fi
done)
if [ -z "$CONTAINER_NAME" ]; then
    echo "❌ No container matched PID $SGLANG_PID. This skill runs the bench client"
    echo "   via 'docker exec' because the sglang package is only installed inside"
    echo "   the server container. A host-only SGLang install is not supported here."
    exit 1
fi
echo "✓ SGLang container: $CONTAINER_NAME"
```

Read the launch args **once** — they give you both the container-internal port
and the `--device` flag. The bench client runs via `docker exec` inside the
container, so the port must be the one SGLang binds *inside* the container
(host `ss` can't see the container-namespaced socket). The `--device xpu` check
is REQUIRED — it catches a server that silently fell back to CPU:

```sh
# 2. Read port + device from the launch args in one pass (REQUIRED)
ARGS=$(ps -p "$SGLANG_PID" -o args=)
SGLANG_PORT=$(echo "$ARGS" | awk '{for(i=1;i<=NF;i++) if($i=="--port" && i<NF) print $(i+1)}' | head -1)
SGLANG_PORT=${SGLANG_PORT:-30000}   # sglang default
DEVICE_ARG=$(echo "$ARGS" | awk '{for(i=1;i<=NF;i++) if($i=="--device" && i<NF) print $(i+1)}' | head -1)
echo "DEVICE_ARG=${DEVICE_ARG:-none}"
if [ "$DEVICE_ARG" = "cuda" ]; then
    echo "❌ Server is on NVIDIA CUDA, not Intel XPU."; exit 1
elif [ "$DEVICE_ARG" = "xpu" ]; then
    echo "✓ SGLang server has --device xpu"
else
    echo "⚠️  Could not confirm --device xpu (got: '${DEVICE_ARG:-none}'); relying on XPU memory check."
fi

# 3. Verify reachable from inside the container and read model name
if ! docker exec "$CONTAINER_NAME" curl -s http://127.0.0.1:$SGLANG_PORT/v1/models >/dev/null 2>&1; then
    echo "❌ SGLang server not responding on container port $SGLANG_PORT."
    exit 1
fi
MODEL=$(docker exec "$CONTAINER_NAME" curl -s http://127.0.0.1:$SGLANG_PORT/v1/models | python3 -c "import sys,json; print(json.load(sys.stdin)['data'][0]['id'])")
echo "✓ Responding on container port $SGLANG_PORT — model: $MODEL"
```

Reject NVIDIA GPU usage, then confirm XPU memory is in use (rules out CPU fallback):

```sh
# 4a. Reject NVIDIA GPU usage — scan only the compute-app PID list and match
# the whole line, so a short PID can't collide with memory/temp/other numbers
# elsewhere in nvidia-smi's output.
if command -v nvidia-smi >/dev/null 2>&1 && \
   nvidia-smi --query-compute-apps=pid --format=csv,noheader 2>/dev/null \
     | tr -d ' ' | grep -qxF "$SGLANG_PID"; then
    echo "❌ Server is running on NVIDIA GPU, not Intel XPU."; exit 1
fi

# 4b. Verify Intel XPU memory usage — -m 18 = "GPU Memory Used (MiB)", CSV output
GPU_COUNT=$(xpu-smi discovery 2>/dev/null | grep -cE "^\| +[0-9]|Device [0-9]+:")
[ "${GPU_COUNT:-0}" -gt 0 ] || GPU_COUNT=1
XPU_IN_USE=0
for id in $(seq 0 $((GPU_COUNT - 1))); do
    MEM_USED=$(xpu-smi dump -d "$id" -m 18 -i 1 -n 1 2>/dev/null | awk -F',' 'NR==2 {gsub(/ /,"",$NF); print int($NF)}')
    echo "  Device $id: ${MEM_USED:-0} MiB"
    [ "${MEM_USED:-0}" -gt 500 ] && XPU_IN_USE=1
done
if [ "$XPU_IN_USE" -eq 0 ]; then
    echo "❌ XPU memory near zero — server may have fallen back to CPU. Restart with --device xpu."
    exit 1
fi
echo "✓ SGLang is confirmed running on Intel XPU"
```

Everything needed for the benchmark is now confirmed:

```sh
# 5. Summary — CONTAINER_NAME, SGLANG_PORT, MODEL were set above
echo "=== Ready to benchmark === Port: $SGLANG_PORT  Model: $MODEL  Container: $CONTAINER_NAME"
```

If no SGLang server is found, if it's running on NVIDIA instead of Intel XPU,
or if it's fallen back to CPU, the checks exit with guidance.

## Metrics

- **TTFT** — wall time to first generated token.
- **TPOT** — mean per-token time after the first.
- **ITL** — per-token inter-arrival; percentiles meaningful for latency SLAs.
- **E2EL** — wall time of one request.
- **Throughput** — `output_tokens / wall_seconds`.

## Prerequisites

A running SGLang-XPU server (per **sglang-xpu-run**). Step 0 above will
verify the server is running, identify its port, and confirm it's using
Intel XPU.

Note on `ALL_PROXY`: if the host has `ALL_PROXY=socks://...` set, the
bench client's HTTP requests may be routed through the SOCKS proxy.
Unset it before benching a local server:

```sh
unset ALL_PROXY all_proxy
```

## Online bench

**Important:** The benchmark client must run **inside the same container**
where the SGLang server is running. The `sglang` package is only installed
in the container environment, not on the host.

**Always use `docker exec` (not `nsenter`) to run benchmarks.** The `nsenter`
approach is fragile and can hang when other processes are stalled.

**Verify from inside the container.** Output files are written inside the
container filesystem. To verify or read results, use
`docker exec "$CONTAINER_NAME" cat "$OUT"`, not host `cat`.

**Always write to a unique output file per run.** `--output-file` appends,
so reusing a name mixes runs — and a stale file from a prior run can trick you
into reading old results instead of running the benchmark. Derive a `RUN_TAG`
from the date and shell PID.

Use the `$SGLANG_PORT`, `$MODEL`, and `$CONTAINER_NAME` discovered in Step 0:

```sh
# Discover conda activate path (may differ on forked images)
CONDA_SH=$(docker exec "$CONTAINER_NAME" sh -c 'find /home /root /opt -maxdepth 5 -name activate -path "*/miniforge*/bin/activate" 2>/dev/null | head -1')

# Unique per-run output file so a stale file can't be mistaken for fresh output:
RUN_TAG=$(date +%Y%m%d-%H%M%S)-$$
OUT="/tmp/bench-${RUN_TAG}.jsonl"

# Run benchmark inside the server container (where sglang is installed):
docker exec -it "$CONTAINER_NAME" bash -c "
. $CONDA_SH && conda activate py3.12 &&
python3 -m sglang.bench_serving \
    --backend sglang-oai-chat \
    --host 127.0.0.1 --port $SGLANG_PORT \
    --model $MODEL \
    --dataset-name random \
    --random-input-len 512 --random-output-len 128 \
    --num-prompts 200 \
    --max-concurrency 8 \
    --output-file $OUT
"

# Read results from inside the container:
docker exec "$CONTAINER_NAME" cat "$OUT"
```

Flag rationales:

- `--backend sglang-oai-chat` → `/v1/chat/completions`. Use `sglang-oai`
  for `/v1/completions`; `sglang` for the native API. Match your server.
- `--dataset-name random` — synthetic, deterministic at the same `--seed`,
  no network. Use `sharegpt` for realistic prompt distribution.
- `--random-input-len` / `--random-output-len` — fix lengths for
  reproducible sweeps.
- `--num-prompts` — aim for `>= 5 × max-concurrency` for steady state.
- `--max-concurrency` — sweep to find the throughput knee.
- `--request-rate inf` (default) — issue all immediately. Pass a finite
  qps for Poisson arrivals (e.g. `--request-rate 4`).
- `--output-file` — append-only JSONL; always use a unique name per run
  (e.g. the `RUN_TAG` above) so stale files aren't mistaken for fresh results.

## Concurrency sweep

Auto-sizes from GPU count to find the throughput knee. Uses the
`$SGLANG_PORT`, `$MODEL`, and `$CONTAINER_NAME` from Step 0:

```sh
GPU_COUNT=$(xpu-smi discovery 2>/dev/null | grep -cE "^\| +[0-9]|Device [0-9]+:")
[ "${GPU_COUNT:-0}" -gt 0 ] || GPU_COUNT=1
CONDA_SH=$(docker exec "$CONTAINER_NAME" sh -c 'find /home /root /opt -maxdepth 5 -name activate -path "*/miniforge*/bin/activate" 2>/dev/null | head -1')
RUN_TAG=$(date +%Y%m%d-%H%M%S)-$$   # unique per sweep; files are /tmp/bench-${RUN_TAG}-c<N>.jsonl

docker exec -it "$CONTAINER_NAME" bash -c "
. $CONDA_SH && conda activate py3.12
for c in $(printf '%s\n' 1 2 4 8 $((GPU_COUNT * 8)) $((GPU_COUNT * 16)) | sort -nu | tr '\n' ' '); do
    echo \"--- concurrency \$c ---\"
    python3 -m sglang.bench_serving \
        --backend sglang-oai-chat \
        --host 127.0.0.1 --port $SGLANG_PORT \
        --model $MODEL \
        --dataset-name random \
        --random-input-len 512 --random-output-len 128 \
        --num-prompts \$((c * 25)) \
        --max-concurrency \$c \
        --output-file /tmp/bench-${RUN_TAG}-c\${c}.jsonl
done
"
```

Knee = throughput plateaus while p99 TPOT climbs. Beyond it, latency
degrades without throughput gain.

## Comparing two runs

```sh
python3 - baseline.jsonl candidate.jsonl <<'PY'
import json, sys

def last(path):
    with open(path) as f:
        lines = [l for l in f if l.strip()]
    return json.loads(lines[-1])

a, b = last(sys.argv[1]), last(sys.argv[2])
for k in ("mean_ttft_ms","p99_ttft_ms","mean_tpot_ms","p99_tpot_ms",
          "request_throughput","output_throughput"):
    print(f"{k:28s}  base={a.get(k,0):.2f}  cand={b.get(k,0):.2f}"
          f"  delta={b.get(k,0)-a.get(k,0):+.2f}")
PY
```

>5% regression on `output_throughput` or >10% on `p99_tpot_ms` is
real. Smaller is noise.

## RadixAttention prefix-cache benchmark

The main sglang-vs-vllm differentiator on Intel. With caching on
(sglang's default), repeated prefixes hit the RadixAttention cache
and TTFT drops sharply on subsequent requests. Runs inside the server
container (where `sglang` is installed), using `$SGLANG_PORT`, `$MODEL`,
and `$CONTAINER_NAME` from Step 0:

```sh
CONDA_SH=$(docker exec "$CONTAINER_NAME" sh -c 'find /home /root /opt -maxdepth 5 -name activate -path "*/miniforge*/bin/activate" 2>/dev/null | head -1')
# Unique per-run tag so a rerun's files don't append onto a stale one:
RUN_TAG=$(date +%Y%m%d-%H%M%S)-$$

# Cache-on run (sglang default), inside the container:
docker exec -it "$CONTAINER_NAME" bash -c "
. $CONDA_SH && conda activate py3.12 &&
python3 -m sglang.bench_serving \
    --backend sglang-oai-chat \
    --host 127.0.0.1 --port $SGLANG_PORT \
    --model $MODEL \
    --dataset-name random \
    --random-input-len 1024 --random-output-len 64 \
    --num-prompts 500 --max-concurrency 8 \
    --random-range-ratio 0.1 \
    --output-file /tmp/cache-on-${RUN_TAG}.jsonl
"

# Read results from inside the container:
docker exec "$CONTAINER_NAME" cat /tmp/cache-on-${RUN_TAG}.jsonl

# Cache-off baseline (restart server with --disable-radix-cache), then re-run
# the docker exec above with --output-file /tmp/cache-off-${RUN_TAG}.jsonl
```

`--random-range-ratio 0.1` → suffixes vary in only the last 10% of
tokens (high prefix overlap, simulates shared-prompt workloads). TTFT
delta between runs is the prefix-cache win.

## Validating quantized serving

HTTP 200 + plausible throughput don't imply correct output. For any
quantized model, before trusting numbers:

1. Capture per-request responses: add `--output-details` to the bench.
2. Read 2–3 sample completions; confirm they parse as language.
3. If non-language, see **sglang-xpu-run**'s Quanti

Examiner la source

Prix et coûts d’utilisation

Obtenir le skill
Prix non confirmé
L’utiliser
Prérequis non confirmés. Consultez les frais d’agent, d’API et de services à la source.
Licence
Apache-2.0
Prix non confirmé
Le prix n’est pas confirmé. Les liens existants vers les sources et l’installation restent disponibles.

Gratuit à obtenir ne signifie pas gratuit à utiliser. Le prix ne constitue pas une évaluation de sécurité. Soumettre un prix →

Source du skill enregistrée

Un chemin vers les instructions est enregistré. Cela ne constitue pas un test, une garantie de sécurité ou de compatibilité.

Réviser avant installation: Éviter l’installation automatique

Licence: Apache-2.0

  • Dependency or permission surface needs review
  • Permission surface may require sandboxing
  • The skill uses `docker exec -it` which may require a TTY; in non-interactive agent environments, this could cause failures. Consider using `docker exec -i` or documenting the need for a pseudo-TTY.
  • The skill hardcodes `conda activate py3.12`; the environment name may differ across container images. It would be more robust to detect the active conda environment or make it configurable.
  • Low GitHub adoption signal
  • Quality score needs review
  • Permission surface needs review: secrets or environment access, shell or command execution
  • GitHub adoption: 22 GitHub stars
  • Stars/forks activity: 22 stars, 6 forks; issue activity unavailable in current metadata
  • Dependency/runtime risk: command execution surface, credential or environment access
  • Permission surface: secrets or environment access, shell or command execution
Ouvrir l’audit complet

Les outils sont des indications de métadonnées, pas une compatibilité testée. Les prompts sont des suggestions.

Commencer par une petite tâche

  1. 1Lisez la source et confirmez entrées, résultats, dépendances et permissions.
  2. 2Demandez un plan à l’agent. Approuvez la configuration et les coûts avant un test isolé.
  3. 3Vérifiez résultats et fichiers modifiés. Signalez uniquement ce qui a été exécuté et conservez la révision source.

Vérifiez les dépendances, clés API et frais externes dans la source. Un dépôt public ne rend pas tous les services gratuits.

Source et conseils d’utilisation

RépertoriéExaminé par IA

Métadonnées et examens sont indicatifs. Popularité, découverte et exécution réussie sont des faits distincts.

Dépôt source
intel/gpu-ai-skills
Licence
Apache-2.0
Version
Unknown
Dernier push GitHub
11 sept. 2026
Registre mis à jour
15 sept. 2026
Chemin des instructions
plugins/intel-gpu-ai-skills/skills/sglang-xpu-bench/SKILL.md @ 0b4fafd09c5e

Version déclarée dans le registre ; vérifiez les versions de la source.

Qualité

57/100

Prometteur

Confiance

50/100

Do not auto-install

Audit

67/100

Revue nécessaire

Ouvrir l’audit completVoir le rapport d’évaluation
  • Dependency or permission surface needs review
  • Permission surface may require sandboxing
  • The skill uses `docker exec -it` which may require a TTY; in non-interactive agent environments, this could cause failures. Consider using `docker exec -i` or documenting the need for a pseudo-TTY.
  • The skill hardcodes `conda activate py3.12`; the environment name may differ across container images. It would be more robust to detect the active conda environment or make it configurable.
  • Low GitHub adoption signal
  • Quality score needs review
  • Permission surface needs review: secrets or environment access, shell or command execution
  • GitHub adoption: 22 GitHub stars
  • Stars/forks activity: 22 stars, 6 forks; issue activity unavailable in current metadata
  • Dependency/runtime risk: command execution surface, credential or environment access
  • Permission surface: secrets or environment access, shell or command execution
Verified installs
—
Résultats
—

Copier ne signifie pas installer. Les compteurs nécessitent un rapport de réussite et ne garantissent pas la qualité globale.

Accès agent

L’API Registry fournit les signaux de décision, confiance, audit, cas d’usage et installation sans analyser l’interface.

Ouvrir l’API d’installationFormat texte LLMOuvrir ManifestPlan de résolution auto
Plus de détails
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