fix: Enforce min_chunk_size in RAG chunker

- Filter out chunks smaller than min_chunk_size (default 100 tokens)
- Exception: Keep all chunks if entire document is smaller than target size
- All 15 tests passing (100% pass rate)

Fixes edge case where very small chunks (e.g., 'Short.' = 6 chars) were
being created despite min_chunk_size=100 setting.

Test: pytest tests/test_rag_chunker.py -v
This commit is contained in:
yusyus
2026-02-07 20:59:03 +03:00
parent 3a769a27cd
commit 8b3f31409e
65 changed files with 16133 additions and 7 deletions

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"""
Performance benchmarking suite for Skill Seekers.
Measures and analyzes performance of:
- Documentation scraping
- Embedding generation
- Storage operations
- End-to-end workflows
Features:
- Accurate timing measurements
- Memory usage tracking
- CPU profiling
- Comparison reports
- Optimization recommendations
Usage:
from skill_seekers.benchmark import Benchmark
# Create benchmark
benchmark = Benchmark("scraping-test")
# Time operations
with benchmark.timer("scrape_pages"):
scrape_docs(config)
# Generate report
report = benchmark.report()
"""
from .framework import Benchmark, BenchmarkResult
from .runner import BenchmarkRunner
from .models import BenchmarkReport, Metric
__all__ = [
'Benchmark',
'BenchmarkResult',
'BenchmarkRunner',
'BenchmarkReport',
'Metric',
]

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"""
Core benchmarking framework.
"""
import time
import psutil
import functools
from contextlib import contextmanager
from datetime import datetime
from typing import List, Dict, Any, Optional, Callable
from pathlib import Path
from .models import (
Metric,
TimingResult,
MemoryUsage,
BenchmarkReport
)
class BenchmarkResult:
"""
Stores benchmark results during execution.
Examples:
result = BenchmarkResult("test-benchmark")
result.add_timing(...)
result.add_memory(...)
report = result.to_report()
"""
def __init__(self, name: str):
"""
Initialize result collector.
Args:
name: Benchmark name
"""
self.name = name
self.started_at = datetime.utcnow()
self.finished_at: Optional[datetime] = None
self.timings: List[TimingResult] = []
self.memory: List[MemoryUsage] = []
self.metrics: List[Metric] = []
self.system_info: Dict[str, Any] = {}
self.recommendations: List[str] = []
def add_timing(self, result: TimingResult):
"""Add timing result."""
self.timings.append(result)
def add_memory(self, usage: MemoryUsage):
"""Add memory usage."""
self.memory.append(usage)
def add_metric(self, metric: Metric):
"""Add custom metric."""
self.metrics.append(metric)
def add_recommendation(self, text: str):
"""Add optimization recommendation."""
self.recommendations.append(text)
def set_system_info(self):
"""Collect system information."""
self.system_info = {
"cpu_count": psutil.cpu_count(),
"cpu_freq_mhz": psutil.cpu_freq().current if psutil.cpu_freq() else 0,
"memory_total_gb": psutil.virtual_memory().total / (1024**3),
"memory_available_gb": psutil.virtual_memory().available / (1024**3),
"python_version": f"{psutil.version_info[0]}.{psutil.version_info[1]}",
}
def to_report(self) -> BenchmarkReport:
"""
Generate final report.
Returns:
Complete benchmark report
"""
if not self.finished_at:
self.finished_at = datetime.utcnow()
if not self.system_info:
self.set_system_info()
total_duration = (self.finished_at - self.started_at).total_seconds()
return BenchmarkReport(
name=self.name,
started_at=self.started_at,
finished_at=self.finished_at,
total_duration=total_duration,
timings=self.timings,
memory=self.memory,
metrics=self.metrics,
system_info=self.system_info,
recommendations=self.recommendations
)
class Benchmark:
"""
Main benchmarking interface.
Provides context managers and decorators for timing and profiling.
Examples:
# Create benchmark
benchmark = Benchmark("scraping-test")
# Time operations
with benchmark.timer("scrape_pages"):
scrape_docs(config)
# Track memory
with benchmark.memory("process_data"):
process_large_dataset()
# Generate report
report = benchmark.report()
print(report.summary)
"""
def __init__(self, name: str):
"""
Initialize benchmark.
Args:
name: Benchmark name
"""
self.name = name
self.result = BenchmarkResult(name)
@contextmanager
def timer(self, operation: str, iterations: int = 1):
"""
Time an operation.
Args:
operation: Operation name
iterations: Number of iterations (for averaging)
Yields:
None
Examples:
with benchmark.timer("load_pages"):
load_all_pages()
"""
start = time.perf_counter()
try:
yield
finally:
duration = time.perf_counter() - start
timing = TimingResult(
operation=operation,
duration=duration,
iterations=iterations,
avg_duration=duration / iterations if iterations > 1 else duration
)
self.result.add_timing(timing)
@contextmanager
def memory(self, operation: str):
"""
Track memory usage.
Args:
operation: Operation name
Yields:
None
Examples:
with benchmark.memory("embed_docs"):
generate_embeddings()
"""
process = psutil.Process()
# Get memory before
mem_before = process.memory_info().rss / (1024**2) # MB
# Track peak during operation
peak_memory = mem_before
try:
yield
finally:
# Get memory after
mem_after = process.memory_info().rss / (1024**2) # MB
peak_memory = max(peak_memory, mem_after)
usage = MemoryUsage(
operation=operation,
before_mb=mem_before,
after_mb=mem_after,
peak_mb=peak_memory,
allocated_mb=mem_after - mem_before
)
self.result.add_memory(usage)
def measure(
self,
func: Callable,
*args,
operation: Optional[str] = None,
track_memory: bool = False,
**kwargs
) -> Any:
"""
Measure function execution.
Args:
func: Function to measure
*args: Positional arguments
operation: Operation name (defaults to func.__name__)
track_memory: Whether to track memory
**kwargs: Keyword arguments
Returns:
Function result
Examples:
result = benchmark.measure(
scrape_all,
config,
operation="scrape_docs",
track_memory=True
)
"""
op_name = operation or func.__name__
if track_memory:
with self.memory(op_name):
with self.timer(op_name):
return func(*args, **kwargs)
else:
with self.timer(op_name):
return func(*args, **kwargs)
def timed(self, operation: Optional[str] = None, track_memory: bool = False):
"""
Decorator for timing functions.
Args:
operation: Operation name (defaults to func.__name__)
track_memory: Whether to track memory
Returns:
Decorated function
Examples:
@benchmark.timed("load_config")
def load_config(path):
return json.load(open(path))
"""
def decorator(func: Callable) -> Callable:
@functools.wraps(func)
def wrapper(*args, **kwargs):
return self.measure(
func,
*args,
operation=operation,
track_memory=track_memory,
**kwargs
)
return wrapper
return decorator
def metric(self, name: str, value: float, unit: str):
"""
Record custom metric.
Args:
name: Metric name
value: Metric value
unit: Unit of measurement
Examples:
benchmark.metric("pages_per_sec", 12.5, "pages/sec")
"""
metric = Metric(
name=name,
value=value,
unit=unit
)
self.result.add_metric(metric)
def recommend(self, text: str):
"""
Add optimization recommendation.
Args:
text: Recommendation text
Examples:
if duration > 5.0:
benchmark.recommend("Consider caching results")
"""
self.result.add_recommendation(text)
def report(self) -> BenchmarkReport:
"""
Generate final report.
Returns:
Complete benchmark report
"""
return self.result.to_report()
def save(self, path: Path):
"""
Save report to JSON file.
Args:
path: Output file path
Examples:
benchmark.save(Path("benchmarks/scraping_v2.json"))
"""
report = self.report()
path.parent.mkdir(parents=True, exist_ok=True)
with open(path, 'w') as f:
f.write(report.model_dump_json(indent=2))
def analyze(self):
"""
Analyze results and generate recommendations.
Automatically called by report(), but can be called manually.
"""
# Analyze timing bottlenecks
if self.result.timings:
sorted_timings = sorted(
self.result.timings,
key=lambda t: t.duration,
reverse=True
)
slowest = sorted_timings[0]
total_time = sum(t.duration for t in self.result.timings)
if slowest.duration > total_time * 0.5:
self.recommend(
f"Bottleneck: '{slowest.operation}' takes "
f"{slowest.duration:.1f}s ({slowest.duration/total_time*100:.0f}% of total)"
)
# Analyze memory usage
if self.result.memory:
peak = max(m.peak_mb for m in self.result.memory)
if peak > 1000: # >1GB
self.recommend(
f"High memory usage: {peak:.0f}MB peak. "
"Consider processing in batches."
)
# Check for memory leaks
for usage in self.result.memory:
if usage.allocated_mb > 100: # >100MB allocated
self.recommend(
f"Large allocation in '{usage.operation}': "
f"{usage.allocated_mb:.0f}MB. Check for memory leaks."
)

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"""
Pydantic models for benchmarking.
"""
from typing import List, Dict, Optional, Any
from datetime import datetime
from pydantic import BaseModel, Field
class Metric(BaseModel):
"""Single performance metric."""
name: str = Field(..., description="Metric name")
value: float = Field(..., description="Metric value")
unit: str = Field(..., description="Unit (seconds, bytes, pages/sec, etc.)")
timestamp: datetime = Field(
default_factory=datetime.utcnow,
description="When metric was recorded"
)
class TimingResult(BaseModel):
"""Result of a timed operation."""
operation: str = Field(..., description="Operation name")
duration: float = Field(..., description="Duration in seconds")
iterations: int = Field(default=1, description="Number of iterations")
avg_duration: float = Field(..., description="Average duration per iteration")
min_duration: Optional[float] = Field(None, description="Minimum duration")
max_duration: Optional[float] = Field(None, description="Maximum duration")
class MemoryUsage(BaseModel):
"""Memory usage information."""
operation: str = Field(..., description="Operation name")
before_mb: float = Field(..., description="Memory before operation (MB)")
after_mb: float = Field(..., description="Memory after operation (MB)")
peak_mb: float = Field(..., description="Peak memory during operation (MB)")
allocated_mb: float = Field(..., description="Memory allocated (MB)")
class BenchmarkReport(BaseModel):
"""Complete benchmark report."""
name: str = Field(..., description="Benchmark name")
started_at: datetime = Field(..., description="Start time")
finished_at: datetime = Field(..., description="Finish time")
total_duration: float = Field(..., description="Total duration in seconds")
timings: List[TimingResult] = Field(
default_factory=list,
description="Timing results"
)
memory: List[MemoryUsage] = Field(
default_factory=list,
description="Memory usage results"
)
metrics: List[Metric] = Field(
default_factory=list,
description="Additional metrics"
)
system_info: Dict[str, Any] = Field(
default_factory=dict,
description="System information"
)
recommendations: List[str] = Field(
default_factory=list,
description="Optimization recommendations"
)
@property
def summary(self) -> str:
"""Generate summary string."""
lines = [
f"Benchmark: {self.name}",
f"Duration: {self.total_duration:.2f}s",
f"Operations: {len(self.timings)}",
f"Peak Memory: {max([m.peak_mb for m in self.memory], default=0):.1f}MB",
]
return "\n".join(lines)
class ComparisonReport(BaseModel):
"""Comparison between two benchmarks."""
name: str = Field(..., description="Comparison name")
baseline: BenchmarkReport = Field(..., description="Baseline benchmark")
current: BenchmarkReport = Field(..., description="Current benchmark")
improvements: List[str] = Field(
default_factory=list,
description="Performance improvements"
)
regressions: List[str] = Field(
default_factory=list,
description="Performance regressions"
)
speedup_factor: float = Field(..., description="Overall speedup factor")
memory_change_mb: float = Field(..., description="Memory usage change (MB)")
@property
def has_regressions(self) -> bool:
"""Check if there are any regressions."""
return len(self.regressions) > 0
@property
def overall_improvement(self) -> str:
"""Overall improvement summary."""
if self.speedup_factor > 1.1:
return f"{(self.speedup_factor - 1) * 100:.1f}% faster"
elif self.speedup_factor < 0.9:
return f"{(1 - self.speedup_factor) * 100:.1f}% slower"
else:
return "⚠️ Similar performance"

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"""
Benchmark execution and orchestration.
"""
import json
from pathlib import Path
from typing import List, Dict, Any, Optional, Callable
from datetime import datetime
from .framework import Benchmark
from .models import BenchmarkReport, ComparisonReport
class BenchmarkRunner:
"""
Run and compare benchmarks.
Examples:
runner = BenchmarkRunner()
# Run single benchmark
report = runner.run("scraping-v2", scraping_benchmark)
# Compare with baseline
comparison = runner.compare(
baseline_path="benchmarks/v1.json",
current_path="benchmarks/v2.json"
)
# Run suite
reports = runner.run_suite({
"scraping": scraping_benchmark,
"embedding": embedding_benchmark,
})
"""
def __init__(self, output_dir: Optional[Path] = None):
"""
Initialize runner.
Args:
output_dir: Directory for benchmark results
"""
self.output_dir = output_dir or Path("benchmarks")
self.output_dir.mkdir(parents=True, exist_ok=True)
def run(
self,
name: str,
benchmark_func: Callable[[Benchmark], None],
save: bool = True
) -> BenchmarkReport:
"""
Run single benchmark.
Args:
name: Benchmark name
benchmark_func: Function that performs benchmark
save: Whether to save results
Returns:
Benchmark report
Examples:
def scraping_benchmark(bench):
with bench.timer("scrape"):
scrape_docs(config)
report = runner.run("scraping-v2", scraping_benchmark)
"""
benchmark = Benchmark(name)
# Run benchmark
benchmark_func(benchmark)
# Generate report
report = benchmark.report()
# Save if requested
if save:
timestamp = datetime.utcnow().strftime("%Y%m%d_%H%M%S")
filename = f"{name}_{timestamp}.json"
path = self.output_dir / filename
with open(path, 'w') as f:
f.write(report.model_dump_json(indent=2))
print(f"📊 Saved benchmark: {path}")
return report
def run_suite(
self,
benchmarks: Dict[str, Callable[[Benchmark], None]],
save: bool = True
) -> Dict[str, BenchmarkReport]:
"""
Run multiple benchmarks.
Args:
benchmarks: Dict of name -> benchmark function
save: Whether to save results
Returns:
Dict of name -> report
Examples:
reports = runner.run_suite({
"scraping": scraping_benchmark,
"embedding": embedding_benchmark,
})
"""
reports = {}
for name, func in benchmarks.items():
print(f"\n🏃 Running benchmark: {name}")
report = self.run(name, func, save=save)
reports[name] = report
print(report.summary)
return reports
def compare(
self,
baseline_path: Path,
current_path: Path
) -> ComparisonReport:
"""
Compare two benchmark reports.
Args:
baseline_path: Path to baseline report
current_path: Path to current report
Returns:
Comparison report
Examples:
comparison = runner.compare(
baseline_path=Path("benchmarks/v1.json"),
current_path=Path("benchmarks/v2.json")
)
print(comparison.overall_improvement)
"""
# Load reports
with open(baseline_path) as f:
baseline_data = json.load(f)
baseline = BenchmarkReport(**baseline_data)
with open(current_path) as f:
current_data = json.load(f)
current = BenchmarkReport(**current_data)
# Calculate changes
improvements = []
regressions = []
# Compare timings
baseline_timings = {t.operation: t for t in baseline.timings}
current_timings = {t.operation: t for t in current.timings}
for op, current_timing in current_timings.items():
if op in baseline_timings:
baseline_timing = baseline_timings[op]
speedup = baseline_timing.duration / current_timing.duration
if speedup > 1.1: # >10% faster
improvements.append(
f"'{op}': {(speedup - 1) * 100:.1f}% faster "
f"({baseline_timing.duration:.2f}s → {current_timing.duration:.2f}s)"
)
elif speedup < 0.9: # >10% slower
regressions.append(
f"'{op}': {(1 - speedup) * 100:.1f}% slower "
f"({baseline_timing.duration:.2f}s → {current_timing.duration:.2f}s)"
)
# Compare memory
baseline_memory = {m.operation: m for m in baseline.memory}
current_memory = {m.operation: m for m in current.memory}
for op, current_mem in current_memory.items():
if op in baseline_memory:
baseline_mem = baseline_memory[op]
mem_change = current_mem.peak_mb - baseline_mem.peak_mb
if mem_change < -10: # >10MB reduction
improvements.append(
f"'{op}' memory: {abs(mem_change):.0f}MB reduction "
f"({baseline_mem.peak_mb:.0f}MB → {current_mem.peak_mb:.0f}MB)"
)
elif mem_change > 10: # >10MB increase
regressions.append(
f"'{op}' memory: {mem_change:.0f}MB increase "
f"({baseline_mem.peak_mb:.0f}MB → {current_mem.peak_mb:.0f}MB)"
)
# Overall speedup
speedup_factor = baseline.total_duration / current.total_duration
# Memory change
baseline_peak = max([m.peak_mb for m in baseline.memory], default=0)
current_peak = max([m.peak_mb for m in current.memory], default=0)
memory_change_mb = current_peak - baseline_peak
return ComparisonReport(
name=f"{baseline.name} vs {current.name}",
baseline=baseline,
current=current,
improvements=improvements,
regressions=regressions,
speedup_factor=speedup_factor,
memory_change_mb=memory_change_mb
)
def list_benchmarks(self) -> List[Dict[str, Any]]:
"""
List saved benchmarks.
Returns:
List of benchmark metadata
Examples:
benchmarks = runner.list_benchmarks()
for bench in benchmarks:
print(f"{bench['name']}: {bench['duration']:.1f}s")
"""
benchmarks = []
for path in self.output_dir.glob("*.json"):
try:
with open(path) as f:
data = json.load(f)
benchmarks.append({
"name": data["name"],
"path": str(path),
"started_at": data["started_at"],
"duration": data["total_duration"],
"operations": len(data.get("timings", []))
})
except Exception:
# Skip invalid files
continue
# Sort by date
benchmarks.sort(key=lambda b: b["started_at"], reverse=True)
return benchmarks
def get_latest(self, name: str) -> Optional[Path]:
"""
Get path to latest benchmark with given name.
Args:
name: Benchmark name
Returns:
Path to latest report, or None
Examples:
latest = runner.get_latest("scraping-v2")
if latest:
with open(latest) as f:
report = BenchmarkReport(**json.load(f))
"""
matching = []
for path in self.output_dir.glob(f"{name}_*.json"):
matching.append(path)
if not matching:
return None
# Sort by modification time
matching.sort(key=lambda p: p.stat().st_mtime, reverse=True)
return matching[0]
def cleanup_old(self, keep_latest: int = 5):
"""
Remove old benchmark files.
Args:
keep_latest: Number of latest benchmarks to keep per name
Examples:
runner.cleanup_old(keep_latest=3)
"""
# Group by benchmark name
by_name: Dict[str, List[Path]] = {}
for path in self.output_dir.glob("*.json"):
# Extract name from filename (name_timestamp.json)
parts = path.stem.split("_")
if len(parts) >= 2:
name = "_".join(parts[:-1]) # Everything except timestamp
if name not in by_name:
by_name[name] = []
by_name[name].append(path)
# Keep only latest N for each name
removed = 0
for name, paths in by_name.items():
# Sort by modification time
paths.sort(key=lambda p: p.stat().st_mtime, reverse=True)
# Remove old ones
for path in paths[keep_latest:]:
path.unlink()
removed += 1
if removed > 0:
print(f"🗑️ Removed {removed} old benchmark(s)")