From 0876cf33e8940702e3d09330bc87c5650b466678 Mon Sep 17 00:00:00 2001
From: Nitzan Uziely <linkgoron@gmail.com>
Date: Fri, 5 Mar 2021 14:37:57 +0200
Subject: [PATCH] fs: improve fsPromises writeFile performance

Increase the write chunk size in fsPromises writeFile
to improve performance.
---
 lib/internal/fs/promises.js                             | 2 +-
 test/parallel/test-fs-promises-file-handle-writeFile.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/internal/fs/promises.js b/lib/internal/fs/promises.js
index 32ad2123d47db0..bb7a6396189967 100644
--- a/lib/internal/fs/promises.js
+++ b/lib/internal/fs/promises.js
@@ -7,7 +7,7 @@ const kIoMaxLength = 2 ** 31 - 1;
 // Note: This is different from kReadFileBufferLength used for non-promisified
 // fs.readFile.
 const kReadFileMaxChunkSize = 2 ** 14;
-const kWriteFileMaxChunkSize = 2 ** 14;
+const kWriteFileMaxChunkSize = 512 * 1024;
 
 const {
   ArrayPrototypePush,
diff --git a/test/parallel/test-fs-promises-file-handle-writeFile.js b/test/parallel/test-fs-promises-file-handle-writeFile.js
index bd90a79149b5f1..7ad1beb4bcdd7b 100644
--- a/test/parallel/test-fs-promises-file-handle-writeFile.js
+++ b/test/parallel/test-fs-promises-file-handle-writeFile.js
@@ -30,7 +30,7 @@ async function validateWriteFile() {
 async function doWriteAndCancel() {
   const filePathForHandle = path.resolve(tmpDir, 'dogs-running.txt');
   const fileHandle = await open(filePathForHandle, 'w+');
-  const buffer = Buffer.from('dogs running'.repeat(10000), 'utf8');
+  const buffer = Buffer.from('dogs running'.repeat(512 * 1024), 'utf8');
   const controller = new AbortController();
   const { signal } = controller;
   process.nextTick(() => controller.abort());