latency

问题 Is there any difference in network communication for HTTP GET and POST requests? With GET, I understand that the entire request is sent in one go. With POST, I think the initial request is sent, and then a second request is sent which sends all the parameters. For example, assume that the latency between server and client is 500ms. What would be the total time for a GET vs POST call? 回答1: The packets are all TCP packets, which carry the HTTP protocol, the request method doesn't change the

问题 I want to measure broadcast message latency over our message broker on a 1GB LAN. Messages are transmitted in a pub sub fashion, one publisher, many consumers. The producer timestamps each message using the system clock (DateTime.Now in C#) and consumers measure latency by subtracting the timestamp on the message from DateTime.Now. double latency = (DateTime.Now - msg.NMSTimestamp).TotalMilliseconds; All of the boxes on our LAN sync their time via NTP once an hour yet I'm seeing significant

问题 I need to measure a one direction latency measurement between two applications that communicate thru a LAN and report the result to a data collection server. The client application sends the data using multicast, then it passes thru two servers and the last server is the end point of this test, like so: Agent -> multicast cloud -> server 1 -> server 2 I thought about using NTP (or PTP for LAN) to synchronize "agent" and "server 2", but I wonder what's the right algorithm to implement this and

问题 I am going to test my website speed, primary the webserver latency. Summarize what I want to achieve: 1) a webpage with javascript hosted in my website(http://myweb.com/test-speed.html) 2) I give this url to my friends 3) They don't need to do anything, they just need to access this webpage then the latency is printed out in the webpage. 4) If the webpage can also tell which state the visitor is in(using IP address range database), it will be a plus. Any existing solutions? I can modify the

问题 I'm using Neo4j for a project using the official Neo4j driver for .NET found here: https://www.nuget.org/packages/Neo4j.Driver This driver works over the bolt protocol, my assumption being that a specialized binary protocol would be more efficient than the HTTP API. But ever since the start of the project, I've noticed relatively high latencies from Neo4j for even very simple operations. Such as a match like the following taking 30-60ms when UserID is an indexed field and the database

问题 Are there any protocols, systems, etc. experimental or otherwise designed for allowing normal (as normal as can be) network operations (E-mail, DNS, HTML, etc.) over very high latency links? I'm thinking of minutes to an hour, or maybe two. Think light speed lag at a solar system scale. As a side note: research or speculation on the social effects hour to day scale communication delays would be interesting. Current trends tend towards delays of seconds to minutes (plus however long it takes

问题 I m Using pylot 1.26 tool for load testing but it just gives me Avg. Response Time & Avg. Throughput . from these parameter how can I calculate latency time?? OR suggest me some FREE * TOOL * for load testing which will gives me these parameters. 回答1: Our Load Tester product captures time to first byte (TTFB). This is the time from the beginning of the request until the first byte of the response is received. On small requests (i.e. GETs) that the webserver can respond to instantly (i.e.

问题 I have setup two Raspberry Pis to use UDP sockets, one as the client and one as the server. The kernel has been patched with RT-PREEMPT (4.9.43-rt30+). The client acts as an echo to the server to allow for the calculation of Round-Trip Latency (RTL). At the moment a send frequency of 10Hz is being used on the server side with 2 threads: one for sending the messages to the client and one for receiving the messages from the client. The threads are setup to have a schedule priority of 95 using

问题 I am at the moment making some getjson requests with jquery. They are get requests: "GET http://localhost/MySite/JSON" Now you can watch the requests fire in firebug. Then they return a "200 OK 250ms" . I would like to be able to display something similar on my page itself. So the user can see the latency for themselves. Firebug Image http://testnscale.com/blog/wp-content/uploads/2009/12/firebug.png Image found via google from http://testnscale.com Is it possible to retrieve the MS / Latency

问题 I'm looking into ZeroMQ to see if it's a fit for a soft-realtime application. I was very pleased to see that the latency for small payloads were in the range of 30 micro-seconds or so. However in my simple tests, I'm getting about 300 micro-seconds. I have a simple publisher and subscriber, basically copied from examples off the web and I'm sending one byte through localhost. I've played around for about two days w/ different sockopts and I'm striking out. Any help would be appreciated! pub