fs: improve fsPromises writeFile performance

Increase the write chunk size in fsPromises writeFile
to improve performance.

PR-URL: nodejs#37610
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Antoine du Hamel <[email protected]>

Author: Linkgoron

lib/internal/fs/promises.js

@@ -1,7 +1,5 @@
 'use strict';
 
-const kWriteFileMaxChunkSize = 2 ** 14;
-
 const {
   ArrayPrototypePush,
   Error,
@@ -40,6 +38,7 @@ const {
     kMaxUserId,
     kReadFileBufferLength,
     kReadFileUnknownBufferLength,
+    kWriteFileMaxChunkSize
   },
   copyObject,
   getDirents,

lib/internal/fs/utils.js

@@ -125,6 +125,7 @@ const kIoMaxLength = 2 ** 31 - 1;
 // blocking other threads in case the available threads are all in use.
 const kReadFileUnknownBufferLength = 64 * 1024;
 const kReadFileBufferLength = 512 * 1024;
+const kWriteFileMaxChunkSize = 512 * 1024;
 
 const kMaxUserId = 2 ** 32 - 1;
 
@@ -835,6 +836,7 @@ module.exports = {
     kMaxUserId,
     kReadFileBufferLength,
     kReadFileUnknownBufferLength,
+    kWriteFileMaxChunkSize
   },
   assertEncoding,
   BigIntStats,  // for testing

test/parallel/test-fs-promises-file-handle-writeFile.js

@@ -34,7 +34,7 @@ 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());