From 2dfb5da16b97a6c12e01977af5b5188522178a4e Mon Sep 17 00:00:00 2001 From: Stefan Boberg Date: Mon, 20 Apr 2026 21:50:41 +0200 Subject: zen trace analysis support (#945) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Integrates the **tourist** trace analysis library and builds a full `zen trace` command suite for working with Unreal Engine `.utrace` files. ### Trace analysis library (`thirdparty/tourist/`) - Adds the tourist library as a third-party dependency with three modules: **foundation** (platform primitives, memory, scheduling), **trace** (UE Trace protocol decoding), and **analysis** (event dispatching and analyzer framework). - Cross-platform support for Windows, Linux, and macOS. ### `zen trace` CLI commands (`src/zen/cmds/`, `src/zen/trace/`) - **`zen trace analyze`** — Summarize a `.utrace` file: session metadata, thread inventory, command line + build configuration, CPU profiling scopes, timing, event rates, log messages, and (with symbols) memory allocation metrics including live-allocs dumps, callstack-keyed aggregation, and allocation churn. Optional HTML output for memory reports. - **`zen trace inspect`** — Dump the event schema (declared types, fields, sizes) from a trace file. - **`zen trace trim`** — Extract a time-window from a trace into a new `.utrace` file. - **`zen trace serve`** — Launch a local HTTP server hosting an interactive trace viewer; opens in the default browser. ### Symbolication (`src/zen/trace/symbol_resolver.*`, `thirdparty/raw_pdb/`) - Pluggable resolver with multiple backends: `pdb` (in-tree raw_pdb), `dbghelp` (Windows), `llvm-symbolizer` (all platforms), `atos` (macOS). An `auto` backend picks the best available tool per platform. - Microsoft Symbol Server support: downloads PDBs on demand using a redirect-aware HTTP client. - Local PDB cache keyed by image GUID preserves symbols across binary recompilation. - Callstack trimming heuristic strips UE internal noise from reports. - Binary analysis cache (`.ucache_z`) avoids re-resolving the same trace. ### Interactive trace viewer (`src/zen/frontend/html/`, `src/zen/trace/trace_viewer_service.*`) - Timeline: scope-level detail, horizontal zoom/pan, vertical scrolling, viewport-driven loading with pre-computed LOD for responsive navigation of large traces. - Thread grouping (collapsible sidebar sections) synthesized from name suffixes, natural sort order, visual distinction between lane threads and OS threads. - Bookmark and region annotations; region categories with per-category toggles; bookmark marker toggle in the toolbar. - Filterable Logs tab showing captured `UE_LOG` output. - Stats tab with per-scope aggregate statistics. - Memory tab with interactive allocation analysis and an allocation size histogram. - CsvProfiler event parsing and chart UI. ### Other in-branch supporting changes - **Cross-platform browser launcher** (`browser_launcher.{h,cpp}`) used by `trace serve`. - **`ReciprocalU64`** fast 64-bit integer division (zencore/intmath) for trace analyzers. - **`parallelsort`** cross-platform parallel sort helper (zenutil). - Frontend zip build rule so the viewer's HTML assets are bundled into `zen.exe`. - `/Zo` flag for better optimized debug info on Windows release builds. - `trace-tests.cpp` in the `zen-test` harness (harness itself landed on main via #985). --- src/zenstore/cache/cachedisklayer.cpp | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) (limited to 'src/zenstore/cache/cachedisklayer.cpp') diff --git a/src/zenstore/cache/cachedisklayer.cpp b/src/zenstore/cache/cachedisklayer.cpp index 45a4b6456..22b9d0be5 100644 --- a/src/zenstore/cache/cachedisklayer.cpp +++ b/src/zenstore/cache/cachedisklayer.cpp @@ -140,25 +140,37 @@ namespace cache::impl { const char* LogExtension = ".slog"; const char* MetaExtension = ".meta"; + std::filesystem::path GetBucketFilePath(const std::filesystem::path& BucketDir, const std::string& BucketName, const char* Extension) + { + ExtendablePathBuilder<256> Path; + Path.Append(BucketDir); + Path /= BucketName.c_str(); + Path << Extension; + return Path.ToPath(); + } + std::filesystem::path GetIndexPath(const std::filesystem::path& BucketDir, const std::string& BucketName) { - return BucketDir / (BucketName + IndexExtension); + return GetBucketFilePath(BucketDir, BucketName, IndexExtension); } std::filesystem::path GetMetaPath(const std::filesystem::path& BucketDir, const std::string& BucketName) { - return BucketDir / (BucketName + MetaExtension); + return GetBucketFilePath(BucketDir, BucketName, MetaExtension); } std::filesystem::path GetLogPath(const std::filesystem::path& BucketDir, const std::string& BucketName) { - return BucketDir / (BucketName + LogExtension); + return GetBucketFilePath(BucketDir, BucketName, LogExtension); } std::filesystem::path GetManifestPath(const std::filesystem::path& BucketDir, const std::string& BucketName) { ZEN_UNUSED(BucketName); - return BucketDir / "zen_manifest"; + ExtendablePathBuilder<256> Path; + Path.Append(BucketDir); + Path /= "zen_manifest"; + return Path.ToPath(); } bool ValidateCacheBucketIndexEntry(const DiskIndexEntry& Entry, std::string& OutReason) -- cgit v1.2.3