Model Throughput Tester

Automation skill for Model Throughput Tester.

Benchmark LLM model throughput (tokens/s). Two modes available:

• Auto Mode: Test current model via openclaw infer model run, no API key required
• API Mode: Direct call to OpenAI-compatible API, requires URL and Key

When to Use

Use when: User explicitly requests a model throughput test.

Trigger words:

• throughput test, tokens/s, speed test, benchmark
• model speed, latency test, model test

Do NOT trigger: Broad performance discussion terms (e.g. "model performance", standalone "benchmark") should not auto-trigger execution.

Auto Mode (no API key):

bash

python3 throughput.py --auto --model "<current session model>"

Core Features

1. Auto Mode (No Key, Recommended)

bash

python3 throughput.py --auto

Test a specific model:

bash

python3 throughput.py --auto --model "zai/glm-5-turbo"

2. API Mode (Direct API Call)

bash

python3 throughput.py \
  --url https://api.example.com/v1 \
  --key sk-xxx \
  --models gpt-4o-mini,gpt-4o

3. Common Parameters

Parameter	Default	Description
--iterations	3	Test iterations per model
--max-tokens	512	Max output tokens
--test-prompt	English prose (summer field)	Test prompt
--timeout	60	Single request timeout (seconds)
--output	throughput-report.md	Output report filename
--csv	false	Also generate CSV

Workflow

Auto Mode Flow

text

1. Read current session model from openclaw.json (provider/model)
2. Send test prompt via openclaw infer model run
3. Timer: command start → output complete
4. Estimate token count from response text (English: 0.75 word/token, Chinese: 1.5 chars/token)
5. Calculate tokens/s
6. Generate summary report

API Mode Flow

text

1. Build /v1/chat/completions request
2. Timer: request start → last token received
3. Extract usage.completion_tokens from response (precise)
4. Calculate tokens/s, error rate
5. Generate summary report

Metrics

Metric	Description
Tokens/s	Throughput = Output Tokens / Elapsed Time
Avg Latency	Average single request latency
Avg Output Tokens	Average output token count
Error Rate	Failed request ratio

Output Example

markdown

# Model Throughput Report
**Mode:** Auto (openclaw infer)
**Iterations:** 3

## Summary
| Model | Avg Tokens/s | Avg Latency(s) | Avg Output Tokens | Error Rate |
|-------|-------------|----------------|-------------------|------------|
| zai/glm-5-turbo | 57.9 | 20.6 | 979.0 | 0.0% |

## Detail
### zai/glm-5-turbo
| Iter | Latency(s) | Output Tokens | Tokens/s | Status |
|------|------------|--------------|---------|--------|
| 1 | 19.5 | 950 | 48.7 | ✅ |
| 2 | 21.3 | 1010 | 47.4 | ✅ |
| 3 | 20.9 | 977 | 46.7 | ✅ |

Error Handling

Scenario	Auto Mode	API Mode
openclaw not installed	cli_error	—
Model not found	api_error	http_404
Network timeout	timeout	timeout
Token estimation	English 0.75 word/token, Chinese 1.5 chars/token	Precise from API

Usage Examples

Quick Test After Install (Auto Mode)

bash

python3 ~/.openclaw/workspace/skills/model-throughput-tester/throughput.py --auto --model "<current session model>"

# Or auto-detect (may not match session override)
python3 ~/.openclaw/workspace/skills/model-throughput-tester/throughput.py --auto

Test Multiple Models (API Mode)

bash

python3 throughput.py \
  --url "https://api.openai.com/v1" \
  --key "sk-xxx" \
  --models "gpt-4o-mini,gpt-4o" \
  --iterations 5

Custom Prompt

bash

python3 throughput.py --auto \
  --test-prompt "Explain quantum computing in detail." \
  --iterations 5

Technical Details

• Auto Mode: openclaw infer model run --json, Python subprocess call
• API Mode: urllib (Python built-in), OpenAI-compatible /v1/chat/completions
• Timer Precision: time.perf_counter() nanosecond-level
• Token Counting: API mode uses usage.completion_tokens (precise), Auto mode estimates by character count
• URL Handling: Smart detection of /v1, /v4, /chat/completions paths

Notes

• Auto mode throughput includes gateway routing overhead, slightly lower than direct API (~1-3%)
• Auto mode token count is estimated, API mode is precise
• English prompts recommended for more accurate token estimation
• Anti-cache: random seed suffix appended to each iteration

Limitations

Auto mode cannot cap output length. openclaw infer model run does not expose a --max-tokens flag (verified via --help), so the CLI argument --max-tokens is silently ignored when running with --auto. This means:

• A slow model (e.g. <30 tokens/s) may exceed --timeout on long outputs and be marked timeout even though it is healthy.
• The --max-tokens CLI arg only applies to API mode (direct OpenAI-compatible call).
• To test slow models reliably with --auto, use the medium-length default prompt (Write three short paragraphs about summer meadows. — ~200-300 tokens output), raise --timeout (e.g. 120-180s) for slow models, or override --test-prompt to suit the model.
• For precise max_tokens control and accurate usage.completion_tokens, use API mode (--url, --key, --models).

Warmup is enabled by default. The first request to a model often pays a cold-start cost (KV cache init, weight load) that is not representative of steady-state throughput. A warmup request is fired and discarded before the timed iterations begin. Pass --no-warmup to disable (e.g. when measuring cold-start latency deliberately).

Testing

bash

python3 tests/test_throughput.py

26 unit tests covering: token estimation (EN/ZH/mixed/empty), language detection threshold, provider/model parsing, URL handling (/v1, /v4, full path, trailing slash), markdown report generation (ok/timeout/cache_hit/multi-model/empty), CSV output, and config loading. No network requests — tests cover pure logic only.