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-rw-r--r--tools/js_optimizer.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/js_optimizer.py b/tools/js_optimizer.py
index 753e9db8..69a5bb2b 100644
--- a/tools/js_optimizer.py
+++ b/tools/js_optimizer.py
@@ -100,7 +100,7 @@ def run_on_js(filename, passes, js_engine, jcache):
total_size = len(js)
js = None
- cores = multiprocessing.cpu_count()
+ cores = int(os.environ.get('EMCC_CORES') or multiprocessing.cpu_count())
intended_num_chunks = int(round(cores * NUM_CHUNKS_PER_CORE))
chunk_size = min(MAX_CHUNK_SIZE, max(MIN_CHUNK_SIZE, total_size / intended_num_chunks))