https://gcc.gnu.org/g:7e2fdee3e29019b10251d85880053170154776de
commit r16-3545-g7e2fdee3e29019b10251d85880053170154776de
Author: Jan Hubicka <hubi...@ucw.cz>
Date: Wed Sep 3 17:45:02 2025 +0200
Increase default number of LTO partitions
The number of LTO partitions should exceed number of CPUs (or
hyper-threads) of
commonly used CPUs. I think it is time to increase it again and as
discussed
in the LTO and toplevel asm thread, doing so scales quite well. Tmp file
usage
grows from 2.7 to 2.9MB which seems acceptable. Overall build time on
machine
with 256 hyperthreads is comparable.
Bootstrapped/regtested x86_64-linux, comitted.
gcc/ChangeLog:
* params.opt (-param=lto-partitions=): INcrease default value from
128 to 512.
Diff:
---
gcc/params.opt | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/params.opt b/gcc/params.opt
index ac1b2c7eb262..dd53d830895f 100644
--- a/gcc/params.opt
+++ b/gcc/params.opt
@@ -462,7 +462,7 @@ Common Joined UInteger Var(param_min_partition_size)
Init(10000) Param
Minimal size of a partition for LTO (in estimated instructions).
-param=lto-partitions=
-Common Joined UInteger Var(param_lto_partitions) Init(128) IntegerRange(1,
65536) Param
+Common Joined UInteger Var(param_lto_partitions) Init(512) IntegerRange(1,
65536) Param
Number of partitions the program should be split to.
Enum
