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

@@ -1,5 +1,13 @@
 'use strict';
 
+// Most platforms don't allow reads or writes >= 2 GB.
+// See https://github.com/libuv/libuv/pull/1501.
+const kIoMaxLength = 2 ** 31 - 1;
+
+const kReadFileBufferLength = 512 * 1024;
+const kReadFileUnknownBufferLength = 64 * 1024;
+const kWriteFileMaxChunkSize = 512 * 1024;
+
 const {
   ArrayPrototypePush,
   Error,

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

@@ -30,17 +30,13 @@ async function validateWriteFile() {
 async function doWriteAndCancel() {
   const filePathForHandle = path.resolve(tmpDir, 'dogs-running.txt');
   const fileHandle = await open(filePathForHandle, 'w+');
-  try {
-    const buffer = Buffer.from('dogs running'.repeat(512 * 1024), 'utf8');
-    const controller = new AbortController();
-    const { signal } = controller;
-    process.nextTick(() => controller.abort());
-    await assert.rejects(writeFile(fileHandle, buffer, { signal }), {
-      name: 'AbortError'
-    });
-  } finally {
-    await fileHandle.close();
-  }
+  const buffer = Buffer.from('dogs running'.repeat(512 * 1024), 'utf8');
+  const controller = new AbortController();
+  const { signal } = controller;
+  process.nextTick(() => controller.abort());
+  await assert.rejects(writeFile(fileHandle, buffer, { signal }), {
+    name: 'AbortError'
+  });
 }
 
 validateWriteFile()