javascript - nodejs concurrent requests to express controller get records from mongodb wait each other -


i testing controllers see response times in nodejs express module:

1) test connecting mongodb , getting first record using mongoose. related codes:

var mongoose = require('mongoose');  var schema = mongoose.schema;    var scoredataschema = new schema({      _id: schema.types.string,      x: schema.types.number,      y: schema.types.number,      z: schema.types.number, // level      r: schema.types.mixed  }, {      collection: 'scoredata',      versionkey: false  });    scoredataschema.index({ x: 1, y: 1, z: 1}, { unique: true });    var scoredata = mongoose.model('scoredata', scoredataschema);    module.exports = scoredata;

and controller is:

var express = require('express'),      router = express.router(),      scoredata = require('../common/models/scoredata');    module.exports = function(app) {      app.use('/', router);  };    router.get('/mongotest', function(req, res, next) {      scoredata.findone({}, '-_id r', function(err, doc) {          res.end(json.stringify(doc.r));      });  });

results are: enter image description here

2) 1 controller request in browser: enter image description here

3) test see response times settimeout. sending wait time controller , controller returns constant string. 

var express = require('express'),      router = express.router();    module.exports = function(app) {      app.use('/', router);  };    router.get('/mongotest/:time', function(req, res, next) {      var waittime = req.params.time;      settimeout(function(){          res.end(fixedstr);      }, parseint(waittime));  });
enter image description here

question: see in first image seems how controllers waits each other, or related single thread problem in nodejs. mongodb requests should async settimeout function? see in second image sure single request takes 85ms total.

thanks,


Comments

Post a Comment

Popular posts from this blog

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more