eyesight measurement

In the HTML there are three units of measurement, one is PX, the unit name is pixels, the second is EM, the unit name is relative length unit, the third is PT, the unit name is point, we will give you the analysis of the three kinds of units have what role PX unit name is pixel, relative length unit, pixel (px) is a domestic recommendation relative to the display screen resolution; The EM unit name is the relative length unit. Compared with the text

hopefully are useful for understanding the DMA module:1.DMA transfer data from one address space to another address space, which is implemented by the DMA controller, does not rely on the CPU of a large number of data collection and transmission, saving CPU resources.2.DMA work consists of four processesDMA Request-〉DMA Response-〉DMA transfer-〉DMA endThere are three ways to transfer the 3.DMA(1) Stop the CPU to visit the memory;When the peripheral device has a batch of data to be transmitted, t

Tool One: ioPS, a python-written scriptUsage Example: sudo./iops--num_threads 1--time 2/dev/md1Source: http://benjamin-schweizer.de/measuring-disk-io-performance.htmlCode: HTTP://BENJAMIN-SCHWEIZER.DE/FILES/IOPS/IOPS-2011-02-11#!/usr/bin/env python## Copyright (c) 2008-2011 Benjamin Schweizer and others.## Permission to use, copy, modify, and/or D Istribute This software for any# purpose with or without fee are hereby granted, provided that the above# copyright notice And this permission notice

With the modified version of the code, not improved version as long as the change is.function [MHD] = Modhausdorffdist (A, B)% A, point set 1%-B, point set 2% No. of samples of each point set May is different but the dimension of% the points must is the same.% Compute the sizes of the Input point setsasize = size (A); bsize = size (B);% Check If the points has the same dimensionsif asize (2) ~= bsize (2) error (' The dimensions of points I n the sets is not equal '); end% cal

Tcpcopy Project Address: https://github.com/session-replay-tools/tcpcopyAuthor Address: http://blog.csdn.net/wangbin5791: Environment descriptionErecting three servers10.53.132.5210.53.132.5510.53.132.101101 We believe that the online servers, 52 and 55 are test environments. We run Tcpcopy on 101 to copy the online traffic to 55, on 55 We turn the answer to 52 on the route and discard the answer on 52.Apache deployed on 101 and 55 respectively, Port 80902: Step101 Deployment on TcpcopyTcpcopy-x

. NET Framework provides a set of corresponding diagnosticsProgram, System. Diagnostics. Stopwatch provides a set of attributes and methods for running time measurement. Stopwatch stopwatch = New Stopwatch ();Stopwatch. Start (); //Some code you need runStopwatch. Stop ();StringTime=Stopwatch. elapsedmilliseconds. tostring (); It's easy to see the middleCodeThe execution time is elapsed. If you are interested, you can use macros t

Wtime is my first open-source software. Wtime is similar to GNU time, which can run anotherProgramAt the end of the program, the time consumed by the output program (kernel-state ring0 time, user-state ring3 time, total time), memory occupied (Working Set/Peak, page file/Peak) number of I/O (I/O reads, writes, and others ). Project home: http://sourceforge.net/projects/wintime/ Wtime is usually used for performance measurement, because I fou

For example, in a tunnel, how do I know where I am currently in the tunnel?If the tunnel is 3 km long, after entering the tunnel there is no GPS signal, the mobile phone will not be able to use satellite positioning, and then navigation failure. If the phone and the phone can be interconnected (perhaps through the 2G, 3G, 4G signal interconnection), coupled with a mobile phone has a measure of the distance between the phone function (such as radio ranging, measuring azimuth), then can be from a

multiple connections, rather than quitting after a single test. Can Run for specified time (-t option), rather than a set amount of data to transfer (-n or-k option). Print Periodic, intermediate bandwidth, jitter, and loss reports at specified intervals (-i option). Run the server as a daemon (-D option) Use representative streams to test out how link layer compression affects your achievable bandwidth (-f option). A server accepts a single client simultaneously (IPERF3) multiple cli

services are distributed in a load-balanced cluster to provide services, with the expansion of cluster size, in order to meet the cluster environment in the batch distribution and update of the program code, we also need a program code publishing system.This release system can help us achieve the following goals:1) The server of the production environment provides the service by the virtual host, does not need the development personnel to intervene the maintenance and the direct operation, prov

Basic WWW authentication, the attributes is a colon separated username and password. -P Proxy-auth-username:password provides a Basic authentication trust to a transit agent. The user name and password are separated by a: and sent in Base64 encoded form. This string is sent regardless of whether the server is required (that is, if the 401 authentication requirement code is sent). -P attribute Add Basic Proxy authentication, the attributes is a colon separated username and password.

Installing GCCYum-y Install GCC gcc-c++Download packagewget http://acme.com/software/http_load/http_load-12mar2006.tar.gzTar xzvf http_load-12mar2006.tar.gzCD http_load-12mar2006Mkdir/usr/local/manMake make installEdit FileVim URLContent on the write BaiduHttp://www.baidu.comStart testing,-P is the number of concurrent,-s represents time../http_load-p 10-s URL177 fetches, max parallel, 1.08117e+08 bytes, in seconds610830 mean Bytes/connection17.7 fetches/sec, 1.08117e+07 bytes/secmsecs/connect:

//---------The brace here is to let it run the command in parallel if you want to remove the {} serially{echo"online ${node} ..."ssh [email protected]${node}"cd/usr/lib/node_modules/websocket-bench/lib/ websocket-bench-a 998-c 2-k-G generator.js http://172.18 .10.10:3380"} DoneView Code4 Loading Machine Generator.js script1 /*global module, require*/2 vari =0;3 varm =1;4 varc =0;5 varLogger = require ('./logger');6 varStart =Date.now ();7 setTimeout (function () {8}, +);9Module.ex

consisting of some numbers in the natural number 1-1000, each number may appear 0 or more times. Design an algorithm to find the most frequently occurring numbers. */#includeusing namespacestd;voidSearchintA[],intLen//time complexity of O (n){ intsp[ +] = {0}; intMax =0; for(intI=0; i) {Sp[a[i]-1]++;//Store the total number of corresponding numbers in order, such as the position where the number of 1 exists sp[0], the number of 2 exists sp[1] position } for(intI=0; i +; i++) {

*/ Transfer rate:1.55 [Kbytes/sec] Received /* Decomposition of the time consumed on the network, the specific algorithm of each data is not very clear */ Connection Times (MS) Min MEAN[+/-SD] Median max Connect:20 318 926.1 30 2954 processing:40 2160 1462.0 3034 3154 waiting:40 2160 1462.0 3034 3154 Total:60 2479 1276.4 3064 3184 / * The following content is the response for all requests in the entire scene. Each request in the scene has a response time, where 50% of the user

average time spent on each request in parallel Transfer rate:420.52[Kbytes/sec] received average per second of network traffic, can help to troubleshoot the presence of excessive network traffic resulting in extended response timeDecomposition of time consumed on the network:Connection times (ms) Min mean[+/-SD] Median max Connect:0 1 0.5 1 3Processing:245 534 125.2 570 682Waiting: One 386 189.1 409 669Total:246 535 125.0 571

Method 01:# #利用python的标准库cProfile# #nova/api/openstack/wsgi.pyImport TimeImportCProfile, pstats, Stringio fromOslo_middlewareImportREQUEST_IDPR=cprofile.profile () pr.enable () start_time=time.time () dosomething () End_time=time.time () pr.disable () s=Stringio.stringio () sortby='Cumulative'PS= Pstats. Stats (PR, stream=s). Sort_stats (SortBy) ps.print_stats () req_id=Request.environ.get (request_id. ENV_REQUEST_ID) P= Open ("/tmp/test/"+ STR (req_id),'W') P.write (S.getvalue ()) P.close ()Pyt

-ide0-1-0,id=ide0-1-0-netdev Tap,fd=18,id=hostnet0- Device Rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:3f:6a:06,bus=pci.0,addr=0x3-chardev Pty,id=charserial0- Device Isa-serial,chardev=charserial0,id=serial0-usb-vnc 127.0.0.1:0-VGA cirrus-device virtio-balloon-pci,id= balloon0,bus=pci.0,addr=0x4Root 38734 37665 0 17:16 pts/3 00:00:00 grep--color=auto VNCHowever, you can also query by port number.[Email protected]:~# netstat-lntp |grep 590*TCP 0 0 127.0.0.1:5900 0.0.0.0:* LISTEN 38305/KVMTCP6 0

), 2) -K + = 1 - autocovariance.append (result_temp0) in Print(autocovariance) - #Show Results: to #[2418.4380925669107] + - #then calculate the molecule thep =0 *Q =0 $ whileP Len (Zt):Panax NotoginsengQ =0 -RESULT_TEMP1 =0 the whileQ Len (zt[p]): +RESULT_TEMP1 = Result_temp1 + (Zt[p][q]-avg) * (Lzt[p][q]-avg) AQ + = 1 theAutocovariance.append (RESULT_TEMP1)#keep three digits after the decimal point +p + = 1 - Print(autocovariance) $ Print(Len (autocovariance)) $ #Show Results: - #[2418.

response header (response header) to GZIP encoded format, return the result to the script tag, and load the results into the browser, to use Minify, only from http://code.google.com/ Download it on the p/minify/website, unzip it to the/min folder and place it under the Web site root, and then open the Minify Control Panel to the/min/builder/directory. In Control Panel, you can add JavaScript files that you want to reduce, and page generation can link to JavaScript files with reduced script tags