xmlhttprequest - With http2, does number of XHRs have any effect on performance if overall data size is the same? -


as far know, http/2 no longer uses separate tcp connections every request, main performance-booster of protocol.

does mean doesn't matter whether use 10 xhrs 10kb of content each or 1 xhr 100kb , split parts client-side?

a precise answer require benchmark specific case.

in more general terms, client point of view, if can make 10 xhr @ same time (for example, in tight loop), happens 10 requests leave client more or less @ same time, incur in latency between client , server, processed on server (more or less in parallel depending on server architecture), result similar of single xhr - although expect single request more efficient.

from server point of view, however, things may different. if multiply 10 have been done single request, server sees 10x increase in request rate. reading network, request parsing , request dispatching activities heavily optimized in servers, have cost, , 10x increase in cost may noticeable.

and 10x increase in request rate server may impact database well, filesystem, etc. there may ripple effects can noticed performing benchmark.

other things have weigh amount of work need in server aggregate things, , split them on client; along other less measurable things code clarity , maintainability, , forth.

i common pragmatic judgement applies here: if can make same work 1 request, why making 10 requests ? have more specific example ?

if in doubt, measure.


Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

android - Keyboard hides my half of edit-text and button below it even in scroll view -

i having trouble keyboard covers edit-text , half of button in scroll view. here's layout , please tell me how should resolve problem. many questions on topic none of them s working me. <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:background="@drawable/bg" android:layout_height="match_parent"> <scrollview android:layout_width="match_parent" android:fillviewport="true" android:layout_height="match_parent"> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <linearlayout android:layout_width="match_parent" android:layout_height="w...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more