[Bug lto/45375] [meta-bug] Issues with building Mozilla with LTO

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45375

--- Comment #182 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
OK, after a while I should update the stats here.  Richard's new tree merging
patch makes libxul linking a lot faster and less memory consuming.
Peak memory usage (in TOP) is now just bellow 10GB, with bit of incremental
improvmenets I hope to get bellow 8GB again soon.

Bulid time is
real    19m0.355s
user    56m20.459s
sys     2m17.533s

GGC memory usage after stream in 4938399k

Execution times (seconds)
 phase setup             :   0.01 ( 0%) usr   0.00 ( 0%) sys   0.01 ( 0%) wall 
  1399 kB ( 0%) ggc
 phase opt and generate  :  72.86 (12%) usr   0.90 ( 3%) sys  75.25 (11%) wall 
270952 kB ( 7%) ggc
 phase stream in         : 274.88 (44%) usr   9.01 (26%) sys 294.99 (43%) wall
3478515 kB (93%) ggc
 phase stream out        : 282.18 (45%) usr  24.40 (71%) sys 308.42 (45%) wall 
  7162 kB ( 0%) ggc
 garbage collection      :  12.99 ( 2%) usr   0.01 ( 0%) sys  13.00 ( 2%) wall 
     0 kB ( 0%) ggc
 callgraph optimization  :   1.95 ( 0%) usr   0.00 ( 0%) sys   1.95 ( 0%) wall 
    32 kB ( 0%) ggc
 ipa cp                  :   9.82 ( 2%) usr   0.39 ( 1%) sys  10.26 ( 2%) wall 
418482 kB (11%) ggc
 ipa inlining heuristics :  39.30 ( 6%) usr   1.12 ( 3%) sys  41.52 ( 6%) wall
1353294 kB (36%) ggc
 ipa lto gimple in       :   0.45 ( 0%) usr   0.15 ( 0%) sys   0.62 ( 0%) wall 
     0 kB ( 0%) ggc
 ipa lto gimple out      :  18.24 ( 3%) usr   1.50 ( 4%) sys  19.86 ( 3%) wall 
     0 kB ( 0%) ggc
 ipa lto decl in         : 200.68 (32%) usr   5.85 (17%) sys 216.44 (32%) wall
3887175 kB (103%) ggc
 ipa lto decl out        : 256.24 (41%) usr  13.44 (39%) sys 271.24 (40%) wall 
     0 kB ( 0%) ggc
 ipa lto cgraph I/O      :   7.20 ( 1%) usr   1.61 ( 5%) sys   8.83 ( 1%) wall
2134157 kB (57%) ggc
 ipa lto decl merge      :  27.71 ( 4%) usr   0.01 ( 0%) sys  27.72 ( 4%) wall 
  8270 kB ( 0%) ggc
 ipa lto cgraph merge    :  17.31 ( 3%) usr   0.07 ( 0%) sys  17.39 ( 3%) wall 
142240 kB ( 4%) ggc
 whopr wpa               :   8.82 ( 1%) usr   0.04 ( 0%) sys   8.89 ( 1%) wall 
  7165 kB ( 0%) ggc
 whopr wpa I/O           :   1.63 ( 0%) usr   9.43 (27%) sys  11.19 ( 2%) wall 
     0 kB ( 0%) ggc
 whopr partitioning      :   3.21 ( 1%) usr   0.04 ( 0%) sys   3.25 ( 0%) wall 
     0 kB ( 0%) ggc
 ipa reference           :   5.56 ( 1%) usr   0.04 ( 0%) sys   5.81 ( 1%) wall 
     0 kB ( 0%) ggc
 ipa profile             :   1.83 ( 0%) usr   0.02 ( 0%) sys   1.86 ( 0%) wall 
     0 kB ( 0%) ggc
 ipa pure const          :   6.07 ( 1%) usr   0.18 ( 1%) sys   6.26 ( 1%) wall 
     0 kB ( 0%) ggc
 inline parameters       :   0.01 ( 0%) usr   0.00 ( 0%) sys   0.00 ( 0%) wall 
    14 kB ( 0%) ggc
 tree copy propagation   :   0.00 ( 0%) usr   0.00 ( 0%) sys   0.01 ( 0%) wall 
     0 kB ( 0%) ggc
 tree PTA                :   0.05 ( 0%) usr   0.00 ( 0%) sys   0.05 ( 0%) wall 
     0 kB ( 0%) ggc
 tree SSA rewrite        :   0.01 ( 0%) usr   0.00 ( 0%) sys   0.00 ( 0%) wall 
    27 kB ( 0%) ggc
 tree SSA other          :   0.00 ( 0%) usr   0.00 ( 0%) sys   0.01 ( 0%) wall 
     0 kB ( 0%) ggc
 tree CCP                :   0.01 ( 0%) usr   0.00 ( 0%) sys   0.00 ( 0%) wall 
     0 kB ( 0%) ggc
 dominance computation   :   0.00 ( 0%) usr   0.00 ( 0%) sys   0.01 ( 0%) wall 
     0 kB ( 0%) ggc
 varconst                :   0.14 ( 0%) usr   0.12 ( 0%) sys   0.24 ( 0%) wall 
     0 kB ( 0%) ggc
 unaccounted todo        :  10.69 ( 2%) usr   0.29 ( 1%) sys  11.10 ( 2%) wall 
     0 kB ( 0%) ggc 
 TOTAL                 : 629.93            34.31           678.67           
3758029 kB

Memory usage seems about the same with -g.
Honza