From 331f20428c6c94f6c485ab5210a9bf8dc9391f04 Mon Sep 17 00:00:00 2001
From: Yulong Wang <yulongw@microsoft.com>
Date: Wed, 26 May 2021 15:46:50 -0700
Subject: [PATCH] [js/web] only apply max thread number when it's omitted
 (#7834)

---
 js/web/lib/backend-wasm.ts | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/js/web/lib/backend-wasm.ts b/js/web/lib/backend-wasm.ts
index 9c97d47c423db..35d34b27fb24a 100644
--- a/js/web/lib/backend-wasm.ts
+++ b/js/web/lib/backend-wasm.ts
@@ -20,11 +20,10 @@ export const initializeFlags = (): void => {
     env.wasm.initTimeout = 0;
   }
 
-  if (typeof env.wasm.numThreads !== 'number' || !Number.isInteger(env.wasm.numThreads) || env.wasm.numThreads < 0) {
+  if (typeof env.wasm.numThreads !== 'number' || !Number.isInteger(env.wasm.numThreads) || env.wasm.numThreads <= 0) {
     const numCpuLogicalCores = typeof navigator === 'undefined' ? cpus().length : navigator.hardwareConcurrency;
-    env.wasm.numThreads = Math.ceil((numCpuLogicalCores || 1) / 2);
+    env.wasm.numThreads = Math.min(4, Math.ceil((numCpuLogicalCores || 1) / 2));
   }
-  env.wasm.numThreads = Math.min(4, env.wasm.numThreads);
 };
 
 class OnnxruntimeWebAssemblyBackend implements Backend {