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[Bug tree-optimization/44563] GCC uses a lot of RAM when compiling a large numbers of functions
- From: "hubicka at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 13 Dec 2010 01:07:45 +0000
- Subject: [Bug tree-optimization/44563] GCC uses a lot of RAM when compiling a large numbers of functions
- Auto-submitted: auto-generated
- References: <bug-44563-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44563
--- Comment #8 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-13 01:07:33 UTC ---
My profile was at -O2. Concerning Jakub's callgrind, the -O0 compilation
finishes in about 44s for me. Profile is:
4349 3.8607 libc-2.11.1.so libc-2.11.1.so _int_malloc
3150 2.7963 cc1 cc1
record_reg_classes.constprop.9
2881 2.5575 cc1 cc1
htab_find_slot_with_hash
2104 1.8678 cc1 cc1
ggc_set_mark
2039 1.8101 libc-2.11.1.so libc-2.11.1.so
msort_with_tmp
2005 1.7799 cc1 cc1
bitmap_set_bit
1836 1.6299 cc1 cc1
df_ref_create_structure
1775 1.5757 cc1 cc1
find_reloads
1738 1.5429 cc1 cc1
ggc_internal_alloc_stat
1538 1.3653 libc-2.11.1.so libc-2.11.1.so memset
1430 1.2694 cc1 cc1 eq_node
1375 1.2206 cc1 cc1
preprocess_constraints
1317 1.1691 libc-2.11.1.so libc-2.11.1.so _int_free
1309 1.1620 cc1 cc1
df_insn_refs_collect
1289 1.1443 cc1 cc1
ix86_function_arg_regno_p
1277 1.1336 cc1 cc1
df_ref_record
1249 1.1088 cc1 cc1
ix86_save_reg
1215 1.0786 cc1 cc1
ix86_compute_frame_layout
1171 1.0395 libc-2.11.1.so libc-2.11.1.so
malloc_consolidate
1134 1.0067 cc1 cc1
extract_insn
So I don't get that much of RA by itself. Tracking that malloc ineffeciency
might be low hanging fruit.