Increase circleci parallelism

Author: sbc100

.circleci/config.yml

@@ -10,14 +10,11 @@ executors:
   linux-python:
     docker:
       - image: cimg/python:3.10.7
-    environment:
-      EMCC_CORES: "4"
   focal:
     docker:
       - image: emscripten/emscripten-ci:focal
     environment:
       LANG: "C.UTF-8"
-      EMCC_CORES: "4"
       EMSDK_NOTTY: "1"
       EMTEST_WASI_SYSROOT: "~/wasi-sdk/wasi-sysroot"
       EMTEST_BUILD_VERBOSE: "2"
@@ -214,6 +211,7 @@ commands:
           # Must be absolute path or relative path from working_directory
           at: ~/
       - checkout
+      - run: python3 -c "import multiprocessing; print(multiprocessing.cpu_count())"
       - run:
           name: submodule update
           command: git submodule update --init
@@ -456,10 +454,10 @@ jobs:
     # we want it to finish asap
     resource_class: xlarge
     environment:
-      EMCC_CORES: 16
       EMCC_USE_NINJA: 1
     steps:
       - checkout
+      - run: python3 -c "import multiprocessing; print(multiprocessing.cpu_count())"
       - run:
           name: get wasmer
           command: |
@@ -662,8 +660,8 @@ jobs:
   test-wasm64-4gb:
     environment:
       LANG: "C.UTF-8"
-      # Only run 2 tests at a time to avoid OOM (since each test used >4gb)
-      EMCC_CORES: "2"
+      # Only run 4 tests at a time to avoid OOM (since each test used >4gb)
+      EMCC_CORES: 4
     # We don't use `bionic` here since its too old to run recent node versions:
     # `/lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found`
     executor: linux-python