Slow streams over network connection on windows share #56319
Description
Version
v23.4.0
Platform
Microsoft Windows NT 10.0.19045.0 x64
Subsystem
streams
What steps will reproduce the bug?
const fs = require('node:fs');
const readline = require('node:readline');
const sourcePath = "G:\\file.txt"; // 700 MB text file with 547 characters long lines on a windows share
const targetPath = "G:\\file.txt.copy";
const myInterface = readline.createInterface({
input: fs.createReadStream(sourcePath).setEncoding('binary')
});
fs.closeSync(fs.openSync(targetPath, 'w'));
const output = fs.createWriteStream(targetPath);
output.setDefaultEncoding('utf-8');
myInterface.on('line', function (line) {
output.write(line);
});
myInterface.on('close', function (line) {
output.end();
console.log(`Saved!`); // In node, at about 3 or 4 MB over network it shows this "Saved!", but continues copying?!
});
How often does it reproduce? Is there a required condition?
every time
What is the expected behavior? Why is that the expected behavior?
Faster stream copy
What do you see instead?
On 1 GB ethernet connection over windows share, with node v23.4.0 -> 513 seconds . It seemed a lot to me, so I tried with Bun
Same connection and share, with bun 1.1.39 -> 13 seconds.
So node is about 39x (slower)
And it's also strange that at about 3 or 4 MB file.copy, node shows the "Saved!" message but continues copying.
Additional information
On local disk, node is a bit faster than bun.
So it seems that problem is over network connection