allow limiting # of cores in thread pool, useful for debugging

1 files changed, 3 insertions, 0 deletions

diff --git a/src/support/threads.cpp b/src/support/threads.cpp
index 6edff21cb..2f558d051 100644
--- a/src/support/threads.cpp
+++ b/src/support/threads.cpp
@@ -117,6 +117,9 @@ void ThreadPool::initialize(size_t num) {
 ThreadPool* ThreadPool::get() {
   if (!pool) {
     size_t num = std::max(1U, std::thread::hardware_concurrency());
+    if (getenv("BINARYEN_CORES")) {
+      num = std::stoi(getenv("BINARYEN_CORES"));
+    }
     pool = std::unique_ptr<ThreadPool>(new ThreadPool());
     pool->initialize(num);
   }