From 2e87576245aac1845eeddb4ca95847e0be1e7839 Mon Sep 17 00:00:00 2001
From: Danno Ferrin <danno.ferrin@gmail.com>
Date: Mon, 1 Mar 2021 09:08:36 -0700
Subject: [PATCH] Reduce hash calculations in Bonsai Tries (#1960)

Setting contract code on a bonsai account results in a re-hashing. To
reduce this only set the code if the code was changed.  In some cases
this was responsible for 40% of load.

Signed-off-by: Danno Ferrin <danno.ferrin@gmail.com>
---
 .../besu/ethereum/bonsai/BonsaiWorldStateUpdater.java         | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/bonsai/BonsaiWorldStateUpdater.java b/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/bonsai/BonsaiWorldStateUpdater.java
index 03d7764ab4..24d37d6346 100644
--- a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/bonsai/BonsaiWorldStateUpdater.java
+++ b/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/bonsai/BonsaiWorldStateUpdater.java
@@ -217,7 +217,9 @@ public class BonsaiWorldStateUpdater extends AbstractWorldUpdater<BonsaiWorldVie
       } else {
         updatedAccount.setBalance(tracked.getBalance());
         updatedAccount.setNonce(tracked.getNonce());
-        updatedAccount.setCode(tracked.getCode());
+        if (tracked.codeWasUpdated()) {
+          updatedAccount.setCode(tracked.getCode());
+        }
         if (tracked.getStorageWasCleared()) {
           updatedAccount.clearStorage();
         }