build-perf-diagnostics

Performance Analysis Methodology

1. Generate a binlog: dotnet build /bl:{} -m
2. Replay to diagnostic log with performance summary:

   dotnet msbuild build.binlog -noconlog -fl -flp:v=diag;logfile=full.log;performancesummary
   

3. Read the performance summary (at the end of full.log):

   grep "Target Performance Summary\|Task Performance Summary" -A 50 full.log
   

4. Find expensive targets and tasks: The PerformanceSummary section lists all targets/tasks sorted by cumulative time
5. Check for node utilization: grep for scheduling and node messages

   grep -i "node.*assigned\|building with\|scheduler" full.log | head -30
   

6. Check analyzers: grep for analyzer timing

   grep -i "analyzer.*elapsed\|Total analyzer execution time\|CompilerAnalyzerDriver" full.log