On 10/25/21 7:07 AM, Anuj Mittal wrote:

From: Trevor Gamblin <trevor.gamblin@...>
Add "-l 52" to PARALLEL_MAKE in config.json to limit Make and Ninja
builds based on the detected system load. With this option added, if
either tool has at least one job running and detects that the system
load exceeds the given value, it will wait until either the system load
average drops below that limit, or until all other jobs are finished
before starting additional jobs.
Since most autobuilder machines have 56 cores, this should help keep the
system from being overloaded during builds.
Reference: https://www.gnu.org/software/make/manual/html_node/Parallel.html
Signed-off-by: Trevor Gamblin <trevor.gamblin@...>
Signed-off-by: Richard Purdie <richard.purdie@...>
(cherry picked from commit 5c5fc7bcd221427d34bbac80c9bad315fb6de4df)
Signed-off-by: Anuj Mittal <anuj.mittal@...>
---
config.json | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/config.json b/config.json
index 33d36ad..d397365 100644
--- a/config.json
+++ b/config.json
@@ -43,7 +43,7 @@
"PREMIRRORS = ''",
"BB_GENERATE_MIRROR_TARBALLS = '1'",
"BB_NUMBER_THREADS = '16'",
- "PARALLEL_MAKE = '-j 16'",
+ "PARALLEL_MAKE = '-j 16 -l 52'",

We have seen a lot of hung builds when we used this option internally on builders, Additionally some packages like bison started to fail intermittently which seemed like a parallel build issue but never got to see why it would happen only with -l enabled.

So this change would need some testing before we make it permanent into AB

"XZ_MEMLIMIT = '5%'",
"XZ_THREADS = '8'",
"BB_TASK_NICE_LEVEL = '5'",