[Bug lto/87988] [9 regression] Streaming of ABSTRACT_ORIGIN is expensive

hubicka at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Tue Nov 27 11:01:00 GMT 2018


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87988

--- Comment #7 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Hi,
ltrans files are 1374K without and 1339K with patch.

WPA report without patch:
[WPA] read 13690507 SCCs of average size 1.397311
[WPA] 19129895 tree bodies read in total
[WPA] tree SCC table: size 4194301, 2847668 elements, collision ratio: 0.834030
[WPA] tree SCC max chain length 156 (size 1)
[WPA] Compared 5298938 SCCs, 3633923 collisions (0.685783)
[WPA] Merged 5282405 SCCs
[WPA] Merged 9857161 tree bodies
[WPA] Merged 3063763 types
[WPA] 1614359 types prevailed (2464626 associated trees)
[WPA] GIMPLE canonical type table: size 32749, 22785 elements, 149648 searches,
63491 collisions (ratio: 0.424269)
[WPA] GIMPLE canonical type pointer-map: 22785 elements, 348123 searches
[WPA] # of input files: 2236
WPA] Compression: 298531604 input bytes, 898586109 uncompressed bytes (ratio:
3.010020)
[WPA] Size of mmap'd section decls: 298531604 bytes

WPA report with patch:
WPA] read 13139926 SCCs of average size 1.412202
[WPA] 18556224 tree bodies read in total
[WPA] tree SCC table: size 4194301, 2725601 elements, collision ratio: 0.813527
[WPA] tree SCC max chain length 153 (size 1)
[WPA] Compared 5043033 SCCs, 3379920 collisions (0.670216)
[WPA] Merged 5027945 SCCs
[WPA] Merged 9584037 tree bodies
[WPA] Merged 2957501 types
[WPA] 1557131 types prevailed (2402973 associated trees)
[WPA] GIMPLE canonical type table: size 32749, 22783 elements, 148468 searches,
63408 collisions (ratio: 0.427082)
[WPA] GIMPLE canonical type pointer-map: 22783 elements, 347231 searches
[WPA] Compression: 288287953 input bytes, 867825506 uncompressed bytes (ratio:
3.010273)
[WPA] Size of mmap'd section decls: 288287953 bytes


The WPA report after optimization without patch:
WPA statistics
[WPA] read 13690507 SCCs of average size 1.397311
[WPA] 19129895 tree bodies read in total
[WPA] # of input files: 2236
[WPA] # of input cgraph nodes: 411683
[WPA] # of function bodies: 83824
[WPA] # of output files: 128
[WPA] # of output symtab nodes: 1050843
[WPA] # of output tree pickle references: 708465
[WPA] # of output tree bodies: 190996
[WPA] # callgraph partitions: 128
[WPA] Compression: 416611153 input bytes, 1228624058 uncompressed bytes (ratio:
2.949090)
[WPA] Size of mmap'd section decls: 298531604 bytes
[WPA] Size of mmap'd section function_body: 72959123 bytes

with patch:
WPA statistics
[WPA] read 13139926 SCCs of average size 1.412202
[WPA] 18556224 tree bodies read in total
[WPA] # of input files: 2236
[WPA] # of input cgraph nodes: 411683
[WPA] # of function bodies: 83824
[WPA] # of output files: 128
[WPA] # of output symtab nodes: 1050843
[WPA] # of output tree pickle references: 685935
[WPA] # of output tree bodies: 183785
[WPA] # callgraph partitions: 128
[WPA] Compression: 404728108 input bytes, 1193421138 uncompressed bytes (ratio:
2.948699)
[WPA] Size of mmap'd section decls: 288287953 bytes
[WPA] Size of mmap'd section function_body: 71319730 bytes


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