River Riddle 3a845be7d1 Add support for multi-threaded pass timing. ... When multi-threading is enabled in the pass manager the meaning of the display slightly changes. First, a new timing column is added, `User Time`, that displays the total time spent across all threads. Secondly, the `Wall Time` column displays the longest individual time spent amongst all of the threads. This means that the `Wall Time` column will continue to give an indicator on the perceived time, or clock time, whereas the `User Time` will display the total cpu time. Example: $ mlir-opt foo.mlir -experimental-mt-pm -cse -canonicalize -convert-to-llvmir -pass-timing ===-------------------------------------------------------------------------=== ... Pass execution timing report ... ===-------------------------------------------------------------------------=== Total Execution Time: 0.0078 seconds ---User Time--- ---Wall Time--- --- Name --- 0.0175 ( 88.3%) 0.0055 ( 70.4%) Function Pipeline 0.0018 ( 9.3%) 0.0006 ( 8.1%) CSE 0.0013 ( 6.3%) 0.0004 ( 5.8%) (A) DominanceInfo 0.0017 ( 8.7%) 0.0006 ( 7.1%) FunctionVerifier 0.0128 ( 64.6%) 0.0039 ( 50.5%) Canonicalizer 0.0011 ( 5.7%) 0.0004 ( 4.7%) FunctionVerifier 0.0004 ( 2.1%) 0.0004 ( 5.2%) ModuleVerifier 0.0010 ( 5.3%) 0.0010 ( 13.4%) LLVMLowering 0.0009 ( 4.3%) 0.0009 ( 11.0%) ModuleVerifier 0.0198 (100.0%) 0.0078 (100.0%) Total PiperOrigin-RevId: 240636269		2019-03-29 17:47:41 -07:00
mlir	Add support for multi-threaded pass timing.	2019-03-29 17:47:41 -07:00