我有一个大量使用模板的项目.最近编译时间突然上升.我想知道是否有办法看到哪些类/行需要最多的时间来编译.
这是-ftime-report的一些输出
Execution times (seconds) TOTAL : 0.30 0.05 0.37 9119 kB Execution times (seconds) garbage collection : 0.91 ( 6%) usr 0.00 ( 0%) sys 0.92 ( 5%) wall 0 kB ( 0%) ggc callgraph construction: 0.23 ( 2%) usr 0.11 ( 3%) sys 0.37 ( 2%) wall 10652 kB ( 1%) ggc callgraph optimization: 0.18 ( 1%) usr 0.12 ( 3%) sys 0.28 ( 2%) wall 11906 kB ( 2%) ggc varpool construction : 0.04 ( 0%) usr 0.01 ( 0%) sys 0.08 ( 0%) wall 6984 kB ( 1%) ggc cfg construction : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.05 ( 0%) wall 644 kB ( 0%) ggc cfg cleanup : 0.05 ( 0%) usr 0.02 ( 0%) sys 0.05 ( 0%) wall 7 kB ( 0%) ggc trivially dead code : 0.05 ( 0%) usr 0.01 ( 0%) sys 0.12 ( 1%) wall 0 kB ( 0%) ggc df scan insns : 0.37 ( 3%) usr 0.03 ( 1%) sys 0.43 ( 2%) wall 677 kB ( 0%) ggc df live regs : 0.07 ( 0%) usr 0.01 ( 0%) sys 0.02 ( 0%) wall 0 kB ( 0%) ggc df reg dead/unused notes: 0.08 ( 1%) usr 0.01 ( 0%) sys 0.08 ( 0%) wall 2755 kB ( 0%) ggc register information : 0.05 ( 0%) usr 0.01 ( 0%) sys 0.05 ( 0%) wall 0 kB ( 0%) ggc alias analysis : 0.01 ( 0%) usr 0.01 ( 0%) sys 0.01 ( 0%) wall 878 kB ( 0%) ggc rebuild jump labels : 0.03 ( 0%) usr 0.01 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc preprocessing : 0.19 ( 1%) usr 0.44 (11%) sys 0.68 ( 4%) wall 5284 kB ( 1%) ggc parser : 3.94 (28%) usr 1.43 (35%) sys 4.94 (27%) wall 355964 kB (48%) ggc name lookup : 1.35 ( 9%) usr 0.88 (21%) sys 2.76 (15%) wall 64919 kB ( 9%) ggc inline heuristics : 0.14 ( 1%) usr 0.03 ( 1%) sys 0.14 ( 1%) wall 0 kB ( 0%) ggc integration : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 20 kB ( 0%) ggc tree gimplify : 0.31 ( 2%) usr 0.07 ( 2%) sys 0.28 ( 2%) wall 24598 kB ( 3%) ggc tree eh : 0.07 ( 0%) usr 0.02 ( 0%) sys 0.11 ( 1%) wall 7267 kB ( 1%) ggc tree CFG construction : 0.04 ( 0%) usr 0.04 ( 1%) sys 0.11 ( 1%) wall 15754 kB ( 2%) ggc tree CFG cleanup : 0.12 ( 1%) usr 0.00 ( 0%) sys 0.05 ( 0%) wall 3 kB ( 0%) ggc tree find ref. vars : 0.03 ( 0%) usr 0.01 ( 0%) sys 0.02 ( 0%) wall 963 kB ( 0%) ggc tree PHI insertion : 0.00 ( 0%) usr 0.01 ( 0%) sys 0.01 ( 0%) wall 351 kB ( 0%) ggc tree SSA rewrite : 0.03 ( 0%) usr 0.01 ( 0%) sys 0.01 ( 0%) wall 4078 kB ( 1%) ggc tree SSA other : 0.03 ( 0%) usr 0.06 ( 1%) sys 0.12 ( 1%) wall 1504 kB ( 0%) ggc tree operand scan : 0.04 ( 0%) usr 0.02 ( 0%) sys 0.08 ( 0%) wall 10781 kB ( 1%) ggc dominance computation : 0.15 ( 1%) usr 0.04 ( 1%) sys 0.15 ( 1%) wall 0 kB ( 0%) ggc out of ssa : 0.09 ( 1%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 0 kB ( 0%) ggc expand vars : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall 1840 kB ( 0%) ggc expand : 0.45 ( 3%) usr 0.04 ( 1%) sys 0.59 ( 3%) wall 37695 kB ( 5%) ggc post expand cleanups : 0.08 ( 1%) usr 0.02 ( 0%) sys 0.06 ( 0%) wall 4542 kB ( 1%) ggc varconst : 0.15 ( 1%) usr 0.03 ( 1%) sys 0.12 ( 1%) wall 3595 kB ( 0%) ggc jump : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall 1904 kB ( 0%) ggc mode switching : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc integrated RA : 1.33 ( 9%) usr 0.09 ( 2%) sys 1.49 ( 8%) wall 18163 kB ( 2%) ggc reload : 0.60 ( 4%) usr 0.10 ( 2%) sys 0.62 ( 3%) wall 8668 kB ( 1%) ggc thread pro- & epilogue: 0.17 ( 1%) usr 0.00 ( 0%) sys 0.20 ( 1%) wall 11884 kB ( 2%) ggc reg stack : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc final : 0.71 ( 5%) usr 0.10 ( 2%) sys 0.84 ( 5%) wall 6251 kB ( 1%) ggc symout : 1.10 ( 8%) usr 0.16 ( 4%) sys 1.19 ( 6%) wall 100954 kB (14%) ggc uninit var analysis : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc early local passes : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc rest of compilation : 0.49 ( 3%) usr 0.06 ( 1%) sys 0.76 ( 4%) wall 19252 kB ( 3%) ggc unaccounted todo : 0.43 ( 3%) usr 0.09 ( 2%) sys 0.55 ( 3%) wall 0 kB ( 0%) ggc TOTAL : 14.26 4.11 18.52 742072 kB
