chore: import upstream snapshot with attribution

2026-07-13 12:12:13 +08:00
commit 0446c45d8e
898 changed files with 328024 additions and 0 deletions
@@ -0,0 +1,79 @@
+import asyncio
+import time
+from crawl4ai.async_webcrawler import AsyncWebCrawler, CacheMode
+from crawl4ai.async_configs import CrawlerRunConfig
+from crawl4ai.async_dispatcher import MemoryAdaptiveDispatcher, RateLimiter
+
+VERBOSE = False
+
+async def crawl_sequential(urls):
+    config = CrawlerRunConfig(cache_mode=CacheMode.BYPASS, verbose=VERBOSE)
+    results = []
+    start_time = time.perf_counter()
+    async with AsyncWebCrawler() as crawler:
+        for url in urls:
+            result_container = await crawler.arun(url=url, config=config)
+            results.append(result_container[0])
+    total_time = time.perf_counter() - start_time
+    return total_time, results
+
+async def crawl_parallel_dispatcher(urls):
+    config = CrawlerRunConfig(cache_mode=CacheMode.BYPASS, verbose=VERBOSE)
+    # Dispatcher with rate limiter enabled (default behavior)
+    dispatcher = MemoryAdaptiveDispatcher(
+        rate_limiter=RateLimiter(base_delay=(1.0, 3.0), max_delay=60.0, max_retries=3),
+        max_session_permit=50,
+    )
+    start_time = time.perf_counter()
+    async with AsyncWebCrawler() as crawler:
+        result_container = await crawler.arun_many(urls=urls, config=config, dispatcher=dispatcher)
+        results = []
+        if isinstance(result_container, list):
+            results = result_container
+        else:
+            async for res in result_container:
+                results.append(res)
+    total_time = time.perf_counter() - start_time
+    return total_time, results
+
+async def crawl_parallel_no_rate_limit(urls):
+    config = CrawlerRunConfig(cache_mode=CacheMode.BYPASS, verbose=VERBOSE)
+    # Dispatcher with no rate limiter and a high session permit to avoid queuing
+    dispatcher = MemoryAdaptiveDispatcher(
+        rate_limiter=None,
+        max_session_permit=len(urls)  # allow all URLs concurrently
+    )
+    start_time = time.perf_counter()
+    async with AsyncWebCrawler() as crawler:
+        result_container = await crawler.arun_many(urls=urls, config=config, dispatcher=dispatcher)
+        results = []
+        if isinstance(result_container, list):
+            results = result_container
+        else:
+            async for res in result_container:
+                results.append(res)
+    total_time = time.perf_counter() - start_time
+    return total_time, results
+
+async def main():
+    urls = ["https://example.com"] * 100
+    print(f"Crawling {len(urls)} URLs sequentially...")
+    seq_time, seq_results = await crawl_sequential(urls)
+    print(f"Sequential crawling took: {seq_time:.2f} seconds\n")
+    
+    print(f"Crawling {len(urls)} URLs in parallel using arun_many with dispatcher (with rate limit)...")
+    disp_time, disp_results = await crawl_parallel_dispatcher(urls)
+    print(f"Parallel (dispatcher with rate limiter) took: {disp_time:.2f} seconds\n")
+       
+    print(f"Crawling {len(urls)} URLs in parallel using dispatcher with no rate limiter...")
+    no_rl_time, no_rl_results = await crawl_parallel_no_rate_limit(urls)
+    print(f"Parallel (dispatcher without rate limiter) took: {no_rl_time:.2f} seconds\n")
+    
+    print("Crawl4ai - Crawling Comparison")
+    print("--------------------------------------------------------")
+    print(f"Sequential crawling took: {seq_time:.2f} seconds")
+    print(f"Parallel (dispatcher with rate limiter) took: {disp_time:.2f} seconds")
+    print(f"Parallel (dispatcher without rate limiter) took: {no_rl_time:.2f} seconds")
+    
+if __name__ == "__main__":
+    asyncio.run(main())