node.js - Writing multiple files asynchronously -

-

while trying understand event loop, wrote quick snippet test assumptions. no surprise, wrong!

import fs 'fs'  let buffera = new buffer(1e+9) buffera.fill(0)  let bufferb = new buffer(1e+0) bufferb.fill(0)  let filea = fs.opensync('filea', 'w') let fileb = fs.opensync('fileb', 'w')  fs.write(filea, buffera, 0, buffera.length, (err) => { console.log(err || 'wrotea')}) console.log('started writing a..') fs.write(fileb, bufferb, 0, bufferb.length, (err) => { console.log(err || 'wroteb')}) console.log('started writing b..')

i hoping both files written asynchronously (i.e., fileb finishes first), output follows:

started writing a.. started writing b.. wrotea wroteb

with delay before wrotea shown. while fs.write seems operate asynchronously code (i.e., logs written first) seems can have 1 file writing @ time?

per ben noordhuis on github issue opened this:

libuv serializes disk writes on os x due nasty quirk documented here. it's possible newer os x releases fare better hasn't been tested.

node.js uses libuv things file i/o. so...it's serialized (crucially) not block event loop. filea may block writing fileb, not other js stuff. , on os x.


Comments

Post a Comment

Popular posts from this blog

javascript - Slick Slider width recalculation -

-
i'm trying add slide in panel on slick container css. carousel works except new width not being calculated when space has been added. recalibrate once advance next slide i'd happen each time panel opened or closed. i've tried adding both margin , padding, neither makes difference. ideas? https://jsfiddle.net/mhigley/dpf7mlpl/ html: <button type="button" id="button"><i class="fa fa-arrow-right"></i></button> <aside> <h2>slide in panel</h2> <ol> <li>list item</li> <li>list item</li> <li>list item</li> <li>list item</li> <li>list item</li> </ol> </aside> <main role="main"> <div class="sections"> <section> <article> <h2>first slide</h2> <p>lorem ipsum d...
Read more

jsf - PrimeFaces Datatable - What is f:facet actually doing? -

-
looking through primefaces code in app noticed following line: <f:facet name="header">#{trainsearch.traincount} trains</f:facet> it looks overriding header, makes sense, can explain me in little more detail? what happening line of code? complete code listed below: <p:datatable id = "results" value = "#{trainsearch.trains}" var = "train" rendered="#{not empty trainsearch.trains}" styleclass = "train-search-table horizontal-border"> <f:facet name="header">#{trainsearch.traincount} trains</f:facet> <p:column headertext = "train id"> <p:panelgrid columns="1" styleclass = "train-id-grid" layout = "grid"> <h:outputtext styleclass = "train-id-label" value="#{train.traini}"/> <h:outputtex...
Read more

angular2 services - Angular 2 RC 4 Http post not firing -

-
i trying fire post request app , it's not working, tried multiple ways. don't see request being fired under network tab in chrome. not sure problem is, appreciated. import { injectable } '@angular/core'; import { http, headers } '@angular/http'; @injectable() export class userservice{ private _url="users"; constructor(private _http: http){ } checkifusernameexists(username){ return this._http.get(this._url+"/"+username) .map(response => response.json()) } createuser(user){ let headers = new headers(); headers.append('content-type', 'application/json') console.log(json.stringify(user)); return this._http.post(this._url, json.stringify(user),{headers: headers}) .map(response => response.json()) } } first need capture error , solve error: this._http.post(this._url, json.stringify(user),{headers: headers}) .subscribe( ...
Read more