# render URL: /api/orchestration/render/ Section: orchestration -------------------------------------------------------------------------------- render - Bengal window.BENGAL_THEME_DEFAULTS = { appearance: 'dark', palette: 'snow-lynx' }; // Progressive Enhancement System Configuration window.Bengal = window.Bengal || {}; window.Bengal.enhanceBaseUrl = '/bengal/assets/js/enhancements'; window.Bengal.watchDom = true; window.Bengal.debug = false; (function () { try { var defaults = window.BENGAL_THEME_DEFAULTS || { appearance: 'system', palette: '' }; var defaultAppearance = defaults.appearance; if (defaultAppearance === 'system') { defaultAppearance = (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) ? 'dark' : 'light'; } var storedTheme = localStorage.getItem('bengal-theme'); var storedPalette = localStorage.getItem('bengal-palette'); var theme = storedTheme ? (storedTheme === 'system' ? defaultAppearance : storedTheme) : defaultAppearance; var palette = storedPalette ?? defaults.palette; document.documentElement.setAttribute('data-theme', theme); if (palette) { document.documentElement.setAttribute('data-palette', palette); } } catch (e) { document.documentElement.setAttribute('data-theme', 'light'); } })(); Skip to main content Magnifying Glass ESC Recent Clear Magnifying Glass No results for "" Try different keywords or check your spelling Start typing to search... ↑↓ Navigate ↵ Open ESC Close Powered by Lunr ᓚᘏᗢ Documentation Info About Arrow Clockwise Get Started Note Tutorials File Text Content Palette Theming Settings Building Starburst Extending Bookmark Reference Learning Tracks Releases Dev GitHub API Reference bengal CLI Magnifying Glass Search ⌘K Palette Appearance Chevron Down Mode Monitor System Sun Light Moon Dark Palette Snow Lynx Brown Bengal Silver Bengal Charcoal Bengal Blue Bengal List ᓚᘏᗢ Magnifying Glass Search X Close Documentation Info About Arrow Clockwise Get Started Note Tutorials File Text Content Palette Theming Settings Building Starburst Extending Bookmark Reference Learning Tracks Releases Dev GitHub API Reference bengal CLI Palette Appearance Chevron Down Mode Monitor System Sun Light Moon Dark Palette Snow Lynx Brown Bengal Silver Bengal Charcoal Bengal Blue Bengal API Reference __main__ bengal Caret Right Folder Analysis community_detection graph_analysis graph_reporting graph_visualizer knowledge_graph link_suggestions link_types page_rank path_analysis performance_advisor results Caret Right Folder Assets manifest pipeline Caret Right Folder Autodoc base config docstring_parser utils virtual_orchestrator Caret Right Folder Extractors cli openapi python Caret Right Folder Models cli common openapi python Caret Right Folder Cache asset_dependency_map cache_store cacheable compression dependency_tracker page_discovery_cache query_index query_index_registry taxonomy_index utils Caret Right Folder Build Cache autodoc_tracking core file_tracking fingerprint parsed_content_cache rendered_output_cache taxonomy_index_mixin validation_cache Caret Right Folder Indexes author_index category_index date_range_index section_index Caret Right Folder Cli __main__ base site_templates utils Caret Right Folder Commands assets build clean collections config debug explain fix health init perf project serve site skeleton sources theme utils validate Caret Right Folder Graph __main__ bridges communities orphans pagerank report suggest Caret Right Folder New config presets scaffolds site wizard Caret Right Folder Helpers cli_app_loader cli_output config_validation error_handling menu_config metadata progress site_loader traceback validation Caret Right Folder Skeleton hydrator schema Caret Right Folder Templates base registry Caret Right Folder Blog template Caret Right Folder Changelog template Caret Right Folder Default template Caret Right Folder Docs template Caret Right Folder Landing template Caret Right Folder Portfolio template Caret Right Folder Resume template Caret Right Folder Collections errors loader schemas validator Caret Right Folder Config defaults deprecation directory_loader env_overrides environment feature_mappings hash loader merge origin_tracker validators Caret Right Folder Content Layer entry loaders manager source Caret Right Folder Sources github local notion rest Caret Right Folder Content Types base registry strategies Caret Right Folder Core build_context cascade_engine menu section theme Caret Right Folder Asset asset_core css_transforms Caret Right Folder Page computed content metadata navigation operations page_core proxy relationships utils Caret Right Folder Site core data discovery factories page_caches properties section_registry theme Caret Right Folder Debug base config_inspector content_migrator delta_analyzer dependency_visualizer explainer incremental_debugger models reporter shortcode_sandbox Caret Right Folder Discovery asset_discovery content_discovery Caret Right Folder Fonts downloader generator Caret Right Folder Health autofix base health_check report Caret Right Folder Linkcheck async_checker ignore_policy internal_checker models orchestrator Caret Right Folder Validators anchors assets cache config connectivity cross_ref fonts links menu navigation output performance rendering rss sitemap taxonomy tracks Caret Right Folder Directives analysis checkers constants Caret Right Folder Orchestration asset content full_to_incremental incremental menu postprocess related_posts render section static streaming taxonomy Caret Right Folder Postprocess html_output redirects rss sitemap special_pages Caret Right Folder Output Formats index_generator json_generator llm_generator lunr_index_generator txt_generator utils Caret Right Folder Rendering api_doc_enhancer asset_extractor errors jinja_utils link_transformer link_validator pygments_cache renderer template_context template_profiler validator Caret Right Folder Parsers base factory mistune native_html pygments_patch python_markdown Caret Right Folder Pipeline core output thread_local toc transforms Caret Right Folder Plugins badges cross_references inline_icon term variable_substitution Caret Right Folder Directives _icons admonitions badge base button cache cards checklist code_tabs container contracts data_table dropdown embed errors example_label fenced figure glossary icon include list_table literalinclude marimo navigation options rubric steps tabs target term terminal tokens utils validator video Caret Right Folder Template Engine asset_url core environment manifest menu url_helpers Caret Right Folder Template Functions advanced_collections advanced_strings autodoc collections content crossref data dates debug files get_page i18n icons images math_functions navigation pagination_helpers seo strings tables taxonomies theme urls Caret Right Folder Server build_handler component_preview constants dev_server live_reload pid_manager reload_controller request_handler request_logger resource_manager utils Caret Right Folder Services validation Caret Right Folder Themes config Caret Right Folder Utils atomic_write autodoc build_context build_stats build_summary cli_output css_minifier dates dotdict error_handlers file_io file_lock hashing incremental_constants js_bundler live_progress logger metadata observability page_initializer pagination path_resolver paths performance_collector performance_report profile progress retry rich_console sections swizzle text theme_registry theme_resolution thread_local traceback_config traceback_renderer url_normalization url_strategy API Reference Orchestration ᗢ Caret Down Link Copy URL External Open LLM text Copy Copy LLM text Share with AI Ask Claude Ask ChatGPT Ask Gemini Ask Copilot Module orchestration.render Rendering orchestration for Bengal SSG. Handles page rendering in both sequential and parallel modes. Supports free-threaded Python for true parallelism and falls back to sequential rendering on standard Python. Integrates with dependency tracking for incremental builds. Key Concepts: Parallel rendering: ThreadPoolExecutor for concurrent page rendering Free-threaded detection: Automatic detection of GIL-disabled Python Dependency tracking: Template dependency tracking for incremental builds Error handling: Graceful error handling with page-level isolation Related Modules: bengal.rendering.template_engine: Template rendering implementation bengal.rendering.renderer: Individual page rendering logic bengal.cache.dependency_tracker: Dependency graph construction See Also: bengal/orchestration/render.py: render_pages() for rendering entry point plan/active/rfc-template-performance-optimization.md: Performance RFC View source 1 Class 1 Function Classes RenderOrchestrator Orchestrates page rendering in sequential or parallel modes. Handles page rendering with support f… 9 Caret Right Orchestrates page rendering in sequential or parallel modes. Handles page rendering with support for free-threaded Python for true parallelism. Manages thread-local rendering pipelines and integrates with dependency tracking for incremental builds. Creation: Direct instantiation: RenderOrchestrator(site) Created by BuildOrchestrator during build Requires Site instance with pages populated Attributes Name Type Description site — Site instance containing pages and configuration _free_threaded — Whether running on free-threaded Python (GIL disabled) Relationships — Uses: RenderingPipeline for individual page rendering - Uses: DependencyTracker for dependency tracking - Uses: BuildStats for build statistics collection - Used by: BuildOrchestrator for rendering phase Thread Safety: Thread-safe for parallel rendering. Uses thread-local pipelines to avoid contention. Detects free-threaded Python automatically. Methods 1 process Render pages (parallel or sequential). 9 None Caret Right def process(self, pages: list[Page], parallel: bool = True, quiet: bool = False, tracker: DependencyTracker | None = None, stats: BuildStats | None = None, progress_manager: Any | None = None, reporter: Any | None = None, build_context: Any | None = None, changed_sources: set[Path] | None = None) -> None Render pages (parallel or sequential). Parameters 9 pages list[Page] List of pages to render parallel bool Whether to use parallel rendering quiet bool Whether to suppress progress output (minimal output mode) tracker DependencyTracker | None Dependency tracker for incremental builds stats BuildStats | None Build statistics tracker progress_manager Any | None Live progress manager (optional) reporter Any | None build_context Any | None changed_sources set[Path] | None Internal Methods 8 Caret Right __init__ Initialize render orchestrator. 1 None Caret Right def __init__(self, site: Site) Initialize render orchestrator. Parameters 1 site Site Site instance containing pages and configuration _render_sequential Build pages sequentially. 7 None Caret Right def _render_sequential(self, pages: list[Page], tracker: DependencyTracker | None, quiet: bool, stats: BuildStats | None, progress_manager: Any | None = None, build_context: Any | None = None, changed_sources: set[Path] | None = None) -> None Build pages sequentially. Parameters 7 pages list[Page] Pages to render tracker DependencyTracker | None Dependency tracker quiet bool Whether to suppress verbose output stats BuildStats | None Build statistics tracker progress_manager Any | None Live progress manager (optional) build_context Any | None changed_sources set[Path] | None _render_parallel Build pages in parallel for better performance. Threading Model: - Creates… 7 None Caret Right def _render_parallel(self, pages: list[Page], tracker: DependencyTracker | None, quiet: bool, stats: BuildStats | None, progress_manager: Any | None = None, build_context: Any | None = None, changed_sources: set[Path] | None = None) -> None Build pages in parallel for better performance. Threading Model: Creates ThreadPoolExecutor with max_workers threads max_workers comes from config (default: 4) Each thread gets its own RenderingPipeline instance (cached) Each pipeline gets its own MarkdownParser instance (cached) Free-Threaded Python Support (PEP 703): Automatically detects Python 3.13t+ with GIL disabled ThreadPoolExecutor gets true parallelism (no GIL contention) ~1.5-2x faster rendering on multi-core machines No code changes needed - works automatically Caching Strategy: Thread-local caching at two levels: 1. RenderingPipeline: One per thread (Jinja2 environment is expensive) 2. MarkdownParser: One per thread (parser setup is expensive) This means with max_workers=N: N RenderingPipeline instances created N MarkdownParser instances created Both are reused for all pages processed by that thread Performance Example: With 200 pages and max_workers=10: 10 threads created 10 pipelines created (one-time cost: ~50ms) 10 parsers created (one-time cost: ~100ms) Each thread processes ~20 pages Per-page savings: ~5ms (pipeline) + ~10ms (parser) = ~15ms Total savings: ~3 seconds vs creating fresh for each page On free-threaded Python (3.14t): Same setup but ~1.78x faster due to true parallelism 1000 pages in 1.94s vs 3.46s with GIL (515 vs 289 pages/sec) Parameters 7 pages list[Page] Pages to render tracker DependencyTracker | None Dependency tracker for incremental builds quiet bool Whether to suppress verbose output stats BuildStats | None Build statistics tracker progress_manager Any | None Live progress manager (optional) build_context Any | None changed_sources set[Path] | None _render_parallel_simple Parallel rendering without progress (traditional). 6 None Caret Right def _render_parallel_simple(self, pages: list[Page], tracker: DependencyTracker | None, quiet: bool, stats: BuildStats | None, build_context: Any | None = None, changed_sources: set[Path] | None = None) -> None Parallel rendering without progress (traditional). Parameters 6 pages list[Page] tracker DependencyTracker | None quiet bool stats BuildStats | None build_context Any | None changed_sources set[Path] | None _render_sequential_with_progress Render pages sequentially with rich progress bar. 6 None Caret Right def _render_sequential_with_progress(self, pages: list[Page], tracker: DependencyTracker | None, quiet: bool, stats: BuildStats | None, build_context: Any | None = None, changed_sources: set[Path] | None = None) -> None Render pages sequentially with rich progress bar. Parameters 6 pages list[Page] tracker DependencyTracker | None quiet bool stats BuildStats | None build_context Any | None changed_sources set[Path] | None _render_parallel_with_live_progress Render pages in parallel with live progress manager. 7 None Caret Right def _render_parallel_with_live_progress(self, pages: list[Page], tracker: DependencyTracker | None, quiet: bool, stats: BuildStats | None, progress_manager: Any, build_context: Any | None = None, changed_sources: set[Path] | None = None) -> None Render pages in parallel with live progress manager. Parameters 7 pages list[Page] tracker DependencyTracker | None quiet bool stats BuildStats | None progress_manager Any build_context Any | None changed_sources set[Path] | None _render_parallel_with_progress Render pages in parallel with rich progress bar. 6 None Caret Right def _render_parallel_with_progress(self, pages: list[Page], tracker: DependencyTracker | None, quiet: bool, stats: BuildStats | None, build_context: Any | None = None, changed_sources: set[Path] | None = None) -> None Render pages in parallel with rich progress bar. Parameters 6 pages list[Page] tracker DependencyTracker | None quiet bool stats BuildStats | None build_context Any | None changed_sources set[Path] | None _set_output_paths_for_pages Pre-set output paths for specific pages before rendering. Only processes pages… 1 None Caret Right def _set_output_paths_for_pages(self, pages: list[Page]) -> None Pre-set output paths for specific pages before rendering. Only processes pages that are being rendered, not all pages in the site. This is an optimization for incremental builds where we only render a subset. Parameters 1 pages list[Page] Functions _is_free_threaded Detect if running on free-threaded Python (PEP 703). Free-threaded Python (python3.13t+) has the G… 0 bool Caret Right def _is_free_threaded() -> bool Detect if running on free-threaded Python (PEP 703). Free-threaded Python (python3.13t+) has the GIL disabled, allowing true parallel execution with ThreadPoolExecutor. Returns bool — True if running on free-threaded Python, False otherwise ← Previous related_posts Next → section List © 2025 Bengal ᓚᘏᗢ window.BENGAL_LAZY_ASSETS = { tabulator: '/bengal/assets/js/tabulator.min.js', dataTable: '/bengal/assets/js/data-table.js', mermaidToolbar: '/bengal/assets/js/mermaid-toolbar.9de5abba.js', mermaidTheme: '/bengal/assets/js/mermaid-theme.344822c5.js', graphMinimap: '/bengal/assets/js/graph-minimap.cc7e42e3.js', graphContextual: '/bengal/assets/js/graph-contextual.440e59c6.js' }; window.BENGAL_ICONS = { close: '/bengal/assets/icons/close.911d4fe1.svg', enlarge: '/bengal/assets/icons/enlarge.652035e5.svg', copy: '/bengal/assets/icons/copy.3d56e945.svg', 'download-svg': '/bengal/assets/icons/download.04f07e1b.svg', 'download-png': '/bengal/assets/icons/image.c34dfd40.svg', 'zoom-in': '/bengal/assets/icons/zoom-in.237b4a83.svg', 'zoom-out': '/bengal/assets/icons/zoom-out.38857c77.svg', reset: '/bengal/assets/icons/reset.d26dba29.svg' }; Arrow Up X -------------------------------------------------------------------------------- Metadata: - Author: lbliii - Word Count: 2075 - Reading Time: 10 minutes