https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44563
Vladimir Makarov <vmakarov at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |vmakarov at gcc dot gnu.org
--- Comment #39 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Jan Hubicka from comment #38)
>
> Seems a lot of memory is taken by IRA, too.
>
>
I played with the test too. 2^16 functions. It is a lot of insns and IRA/LRA
is not only RA but in some way a code selector too which should keep a lot
additional structures about insns. Memory numbers for IRA is just GCed memory
allocation. We should be interesting in *peak* memory allocation. I don't see
any peak for RA. ./cc1 -O2 with valgrind massif looks like (after recent
Richard's patch changing IRA XNEWs on a memory pool):
KB
206.8^ :
| :::::#::@:::::@::@:::
| ::::: ::::::: : :#::@:::::@::@:::
| :::::::::::::::::::::::::::::: : : : : :#::@:::::@::@:::
| :::: ::::::::: : : : : : :#::@:::::@::@:::
| :@ ::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
| ::@:::::: ::::::::: : : : : : :#::@:::::@::@:::
0
+----------------------------------------------------------------------->Mi
0 1.435
So it is about 200MB *peak* memory consumption and RA consuming only 4% of time
which I think is an excellent result (usually RA takes more time).
integrated RA : 7.21 ( 4%) 1.51 ( 3%) 9.37 ( 3%)
1581592 kB ( 38%)
LRA non-specific : 1.35 ( 1%) 0.31 ( 1%) 1.95 ( 1%)
3584 kB ( 0%)
LRA virtuals elimination : 0.38 ( 0%) 0.10 ( 0%) 0.43 ( 0%)
0 kB ( 0%)
LRA reload inheritance : 0.16 ( 0%) 0.04 ( 0%) 0.14 ( 0%)
0 kB ( 0%)
LRA create live ranges : 0.01 ( 0%) 0.01 ( 0%) 0.08 ( 0%)
0 kB ( 0%)
LRA hard reg assignment : 0.23 ( 0%) 0.06 ( 0%) 0.17 ( 0%)
0 kB ( 0%)
