move to 8-core-ubunut for tests (#420)

* rebase conflict

* adding some missed runners

* change to 16 core

* conflict

* fix up

Author: metascroy

.ci/scripts/gather_test_models.py

@@ -23,7 +23,7 @@
 
 JOB_RUNNERS = {
     "cpu": {
-        "32-core-ubuntu": "x86_64",
+        "8-core-ubuntu": "x86_64",
         # "macos-12": "x86_64", # not working for complie and ExecuTorch yet
         "macos-14": "aarch64",
     },

.github/workflows/pull.yml

@@ -182,7 +182,7 @@ jobs:
   test-tinystories-executorch:
     strategy:
       matrix:
-        runner: [32-core-ubuntu]
+        runner: [16-core-ubuntu]
     runs-on: ${{matrix.runner}}
     steps:
       - name: Checkout repo
@@ -707,7 +707,7 @@ jobs:
   runner-et:
     strategy:
       matrix:
-        runner: [macos-14-xlarge]
+        runner: [macos-14-xlarge, 8-core-ubuntu]
     runs-on: ${{matrix.runner}}
     steps:
       - name: Checkout repo