From 4b5d8bdbaf408042927ef78305f6354721b835fd Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Mon, 31 Aug 2020 17:38:25 -0400
Subject: set maximum size of thread pool to 31 (#7290)

---
 cli/tokio_util.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cli/tokio_util.rs b/cli/tokio_util.rs
index e477cd5ee..b25a2994f 100644
--- a/cli/tokio_util.rs
+++ b/cli/tokio_util.rs
@@ -5,6 +5,12 @@ pub fn create_basic_runtime() -> tokio::runtime::Runtime {
     .basic_scheduler()
     .enable_io()
     .enable_time()
+    // This limits the number of threads for blocking operations (like for
+    // synchronous fs ops) or CPU bound tasks like when we run dprint in
+    // parallel for deno fmt.
+    // The default value is 512, which is an unhelpfully large thread pool. We
+    // don't ever want to have more than a couple dozen threads.
+    .max_threads(32)
     .build()
     .unwrap()
 }
-- 
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