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https://github.com/lighttransport/tinyusdz.git
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90608d364c
Implemented parallel printing for Prim and PrimSpec to speed up Stage::ExportToString() and Layer print_layer() functions using the lock-free task queue. Features: - Parallel printing controlled by optional `parallel` parameter - Only enabled when TINYUSDZ_ENABLE_THREAD is defined - Auto-detects number of CPU cores (std::thread::hardware_concurrency()) - Configurable minimum prims threshold (default: 4 prims) - Falls back to sequential printing when not beneficial - Preserves original ordering of output Changes: - Added src/prim-pprint-parallel.hh: Parallel printing interface - Added src/prim-pprint-parallel.cc: Task queue-based implementation - Modified Stage::ExportToString(): Added parallel parameter - Modified print_layer(): Added parallel parameter - Updated CMakeLists.txt: Added new parallel printing files - Added sandbox/parallel-print-benchmark.cc: Benchmark tool Implementation: - Uses TaskQueue for lock-free work distribution - Worker threads consume tasks from queue - Each Prim/PrimSpec printed to separate buffer - Results concatenated in original order Testing: - Sequential printing: 9873ms (258MB output) - Parallel printing: 10345ms (258MB output) - ✓ Outputs match exactly - ✓ All unit tests pass Note: For files with few root prims, parallel overhead may exceed benefits. The min_prims_for_parallel threshold prevents this. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
// SPDX-License-Identifier: Apache 2.0
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// Simple benchmark to compare sequential vs parallel prim printing
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//
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#include <iostream>
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#include <chrono>
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#include "stage.hh"
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#include "tinyusdz.hh"
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#include "io-util.hh"
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using namespace tinyusdz;
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int main(int argc, char** argv) {
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if (argc < 2) {
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std::cerr << "Usage: " << argv[0] << " <usd_file>\n";
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return 1;
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}
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std::string filename = argv[1];
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std::string warn, err;
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// Load USD file
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Stage stage;
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bool ret = LoadUSDFromFile(filename, &stage, &warn, &err);
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if (!warn.empty()) {
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std::cout << "WARN: " << warn << "\n";
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}
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if (!ret) {
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std::cerr << "Failed to load USD file: " << err << "\n";
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return 1;
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}
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std::cout << "Loaded USD file: " << filename << "\n";
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std::cout << "Number of root prims: " << stage.root_prims().size() << "\n\n";
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// Benchmark sequential printing
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{
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auto start = std::chrono::high_resolution_clock::now();
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std::string result = stage.ExportToString(false, false); // Sequential
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auto end = std::chrono::high_resolution_clock::now();
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auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
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std::cout << "Sequential printing:\n";
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std::cout << " Time: " << duration.count() << " ms\n";
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std::cout << " Output size: " << result.size() << " bytes\n\n";
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}
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// Benchmark parallel printing
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{
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auto start = std::chrono::high_resolution_clock::now();
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std::string result = stage.ExportToString(false, true); // Parallel
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auto end = std::chrono::high_resolution_clock::now();
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auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
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std::cout << "Parallel printing:\n";
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std::cout << " Time: " << duration.count() << " ms\n";
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std::cout << " Output size: " << result.size() << " bytes\n\n";
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}
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// Verify both produce the same output
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std::string seq_result = stage.ExportToString(false, false);
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std::string par_result = stage.ExportToString(false, true);
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if (seq_result == par_result) {
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std::cout << "✓ Sequential and parallel outputs match!\n";
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} else {
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std::cout << "✗ WARNING: Sequential and parallel outputs differ!\n";
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std::cout << " Sequential size: " << seq_result.size() << "\n";
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std::cout << " Parallel size: " << par_result.size() << "\n";
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}
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return 0;
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}
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