https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99105
--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
This is what I see for GCC PGO in train stage. It's from perf top:
4.33% cc1plus [.] __gcov_indirect_call_profiler_v4
◆
2.28% cc1plus [.] __gcov_topn_values_profiler
▒
0.85% cc1plus [.] ggc_internal_alloc
▒
0.83% [kernel] [k] perf_event_task_tick
▒
0.72% libc-2.32.so [.] _int_malloc
▒
0.71% cc1plus [.] ht_lookup_with_hash
▒
0.53% cc1plus [.] grokdeclarator
▒
0.48% cc1plus [.] df_note_compute
▒
0.47% cc1plus [.] get_ref_base_and_extent
▒
0.45% [kernel] [k] clear_page_rep
▒
0.44% cc1plus [.] _cpp_lex_direct
▒
0.41% cc1plus [.] walk_tree_1
▒
0.41% cc1plus [.] et_splay
▒
0.41% cc1plus [.] bitmap_set_bit
▒
0.40% libc-2.32.so [.] _int_free
▒
0.39% cc1plus [.] bitmap_list_find_element
▒
0.36% libc-2.32.so [.] malloc
▒
0.35% cc1plus [.] operand_compare::operand_equal_p
▒
0.35% cc1plus [.] hash_table<named_decl_hash,
false, xcallocator>::find_slot_with_ha▒
In the case of GCC, we emit 500 .gcda files.
@Honza: Can you please test my patch that uses glibc buffered I/O if it helps?
