[gcc r16-3545] Increase default number of LTO partitions

[Jan Hubicka]

https://gcc.gnu.org/g:7e2fdee3e29019b10251d85880053170154776de

commit r16-3545-g7e2fdee3e29019b10251d85880053170154776de
Author: Jan Hubicka <hubicka@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