(buildstream) 02/03: _context.py: Add `effective_build_max_jobs` helper

[ju...@apache.org]

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juergbi pushed a commit to branch jbilleter/nested-reapi
in repository https://gitbox.apache.org/repos/asf/buildstream.git

commit 820c8515c3a716eb072a91acc08c8cf018cf72a9
Author: Jürg Billeter <j...@bitron.ch>
AuthorDate: Fri May 23 12:36:10 2025 +0200

    _context.py: Add `effective_build_max_jobs` helper
---
 src/buildstream/_context.py | 12 ++++++++++++
 src/buildstream/_project.py | 11 +----------
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/src/buildstream/_context.py b/src/buildstream/_context.py
index 6b0cf4123..e125e3c89 100644
--- a/src/buildstream/_context.py
+++ b/src/buildstream/_context.py
@@ -531,6 +531,18 @@ class Context:
 
         return self._sourcecache
 
+    @property
+    def effective_build_max_jobs(self) -> int:
+        # Based on some testing (mainly on AWS), maximum effective
+        # max-jobs value seems to be around 8-10 if we have enough cores
+        # users should set values based on workload and build infrastructure
+        if self.build_max_jobs == 0:
+            # User requested automatic max-jobs
+            return self.platform.get_cpu_count(8)
+        else:
+            # User requested explicit max-jobs setting
+            return self.build_max_jobs
+
     # add_project():
     #
     # Add a project to the context.
diff --git a/src/buildstream/_project.py b/src/buildstream/_project.py
index b55f257fa..334462df0 100644
--- a/src/buildstream/_project.py
+++ b/src/buildstream/_project.py
@@ -1075,16 +1075,7 @@ class Project:
 
         # Extend variables with automatic variables and option exports
         # Initialize it as a string as all variables are processed as strings.
-        # Based on some testing (mainly on AWS), maximum effective
-        # max-jobs value seems to be around 8-10 if we have enough cores
-        # users should set values based on workload and build infrastructure
-        if self._context.build_max_jobs == 0:
-            # User requested automatic max-jobs
-            platform = self._context.platform
-            output.base_variables["max-jobs"] = str(platform.get_cpu_count(8))
-        else:
-            # User requested explicit max-jobs setting
-            output.base_variables["max-jobs"] = str(self._context.build_max_jobs)
+        output.base_variables["max-jobs"] = str(self._context.effective_build_max_jobs)
 
         # Export options into variables, if that was requested
         output.options.export_variables(output.base_variables)