Use the number of cores as j value for non goma builds.

The j value in the build util was being set to a high value for local
builds. This was causing bots to die of resource starvation.

Bug: https://github.com/flutter/flutter/issues/127082
Change-Id: I76be56b0bf9785e89e6311aa765da289b4f9eddb
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/44802
Reviewed-by: Ricardo Amador <ricardoamador@google.com>
Reviewed-by: Keyong Han <keyonghan@google.com>
Commit-Queue: Godofredo Contreras <godofredoc@google.com>
(cherry picked from commit 40ef31317bf5a79ffb3813f82f14677ac1ac0df3)
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/45162
Reviewed-by: Drew Roen <drewroen@google.com>

recipe_modules/build_util/api.py

diff --git a/recipe_modules/build_util/api.py b/recipe_modules/build_util/api.py
index 28145d0..bdbbcb8 100644
--- a/recipe_modules/build_util/api.py
+++ b/recipe_modules/build_util/api.py
@@ -40,6 +40,11 @@
   def _calculate_j_value(self):
     """Calculates concurrent jobs value for the current machine."""
     cores = multiprocessing.cpu_count()
+
+    # For non goma builds, set -j to the number of cores.
+    if not self.use_goma:
+      return 5 if self._test_data.enabled else cores
+
     # Assume simultaneous multithreading and therefore half as many cores as
     # logical processors.
     cores //= 2

recipe_modules/build_util/examples/full.expected/basic.json

diff --git a/recipe_modules/build_util/examples/full.expected/basic.json b/recipe_modules/build_util/examples/full.expected/basic.json
index dc6973b..1b049fc 100644
--- a/recipe_modules/build_util/examples/full.expected/basic.json
+++ b/recipe_modules/build_util/examples/full.expected/basic.json
@@ -526,7 +526,7 @@
       "-C",
       "[START_DIR]/out/release",
       "-j",
-      "200",
+      "5",
       "mytarget"
     ],
     "env_suffixes": {

recipe_modules/build_util/examples/full.expected/mac.json

diff --git a/recipe_modules/build_util/examples/full.expected/mac.json b/recipe_modules/build_util/examples/full.expected/mac.json
index a2cad0b..cc35b52 100644
--- a/recipe_modules/build_util/examples/full.expected/mac.json
+++ b/recipe_modules/build_util/examples/full.expected/mac.json
@@ -526,7 +526,7 @@
       "-C",
       "[START_DIR]/out/release",
       "-j",
-      "200",
+      "5",
       "mytarget"
     ],
     "env_suffixes": {

recipe_modules/build_util/examples/full.expected/win.json

diff --git a/recipe_modules/build_util/examples/full.expected/win.json b/recipe_modules/build_util/examples/full.expected/win.json
index e0d40bf..45ed2fe 100644
--- a/recipe_modules/build_util/examples/full.expected/win.json
+++ b/recipe_modules/build_util/examples/full.expected/win.json
@@ -537,7 +537,7 @@
       "-C",
       "[START_DIR]\\out/release",
       "-j",
-      "200",
+      "5",
       "mytarget"
     ],
     "env_suffixes": {

recipes/engine/web_engine.expected/basic.json

diff --git a/recipes/engine/web_engine.expected/basic.json b/recipes/engine/web_engine.expected/basic.json
index b35bfee..aa968fc 100644
--- a/recipes/engine/web_engine.expected/basic.json
+++ b/recipes/engine/web_engine.expected/basic.json
@@ -519,7 +519,7 @@
       "-C",
       "[CACHE]/builder/src/out/wasm_release",
       "-j",
-      "200"
+      "5"
     ],
     "cwd": "[CACHE]/builder",
     "env": {

recipes/engine_v2/builder.expected/dart-internal-flutter.json

diff --git a/recipes/engine_v2/builder.expected/dart-internal-flutter.json b/recipes/engine_v2/builder.expected/dart-internal-flutter.json
index d3d2a60..97df178 100644
--- a/recipes/engine_v2/builder.expected/dart-internal-flutter.json
+++ b/recipes/engine_v2/builder.expected/dart-internal-flutter.json
@@ -375,7 +375,7 @@
       "-C",
       "[CACHE]/builder/src/out/ios_debug",
       "-j",
-      "200"
+      "5"
     ],
     "env": {
       "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",