Today when I tried to implement an example of using async/sync I/O methods
in NodeJs, I faced an strange problem. When I'm trying to send requests
with ab, I get this error in Async method:
{ [Error: EMFILE, open 'sample.txt'] errno: 20, code: 'EMFILE', path:
> 'sample.txt' }
But the same functionality in Sync mode works well, without any errors.
This is my ab command for running the test: ab -n 10000 -c 1000 -vhr
http://localhost:8080/
Here is my both codes:
*Async:*
http.createServer(function (req, res) {
> fs.readFile('sample.txt', function (err, data) {
> if(err) {
> res.writeHead(500, {'Content-Type': 'text/plain'});
> res.end();
> console.log(err);
> } else {
> res.writeHead(200, {'Content-Type': 'text/plain'});
> res.end(data);
> }
> });
> }).listen(8080, '127.0.0.1');
*Sync:*
http.createServer(function (req, res) {
> var fileOutput = fs.readFileSync('sample.txt').toString();
> if(!fileOutput) {
> res.writeHead(500, {'Content-Type': 'text/plain'});
> res.end('Error in reading the file.');
> } else {
> res.writeHead(200, {'Content-Type': 'text/plain'});
> res.end(fileOutput);
> }
> }).listen(8081, '127.0.0.1');
What's the matter? Is there any problem in using Async methods?
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