From bc50fd4ad638b4161bcb1032df719f548ff9cc68 Mon Sep 17 00:00:00 2001
From: "Jeff Washington (jwash)"
 <75863576+jeffwashington@users.noreply.github.com>
Date: Mon, 27 Sep 2021 11:25:06 -0500
Subject: [PATCH] allocate threads for accounts idx based on cpus (#20118)

---
 runtime/src/accounts_index_storage.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/runtime/src/accounts_index_storage.rs b/runtime/src/accounts_index_storage.rs
index 9781d702df..74ab683b69 100644
--- a/runtime/src/accounts_index_storage.rs
+++ b/runtime/src/accounts_index_storage.rs
@@ -44,11 +44,11 @@ impl<T: IndexValue> Drop for AccountsIndexStorage<T> {
 
 impl<T: IndexValue> AccountsIndexStorage<T> {
     pub fn new(bins: usize, config: &Option<AccountsIndexConfig>) -> AccountsIndexStorage<T> {
-        const DEFAULT_THREADS: usize = 1; // soon, this will be a cpu calculation
+        let num_threads = std::cmp::max(2, num_cpus::get() / 4);
         let threads = config
             .as_ref()
             .and_then(|config| config.flush_threads)
-            .unwrap_or(DEFAULT_THREADS);
+            .unwrap_or(num_threads);
 
         let storage = Arc::new(BucketMapHolder::new(bins, config, threads));