徐汇集团网站建设,输入公司名字找不到公司网站,wordpress更换新主题,国外可以用什么网站做问卷Activity Monitor#xff0c;官方解释为#xff1a;#xff08;活动监视器#xff09;即实时显示CPU、内存和网络的使用情况#xff0c;记录由虚拟内存大小测量的系统负载。用一句大白话来说#xff0c;Activity Monitor类似Windows中的任务管理器#xff0c;可以实时查…Activity Monitor官方解释为活动监视器即实时显示CPU、内存和网络的使用情况记录由虚拟内存大小测量的系统负载。用一句大白话来说Activity Monitor类似Windows中的任务管理器可以实时查看进程占用的CPU、内存的使用量。 一、Activity Monitor的介绍和大致使用 具体操作步骤 首先从Xcode中运行Instruments在顶部的菜单栏中选择 PRoduct选择Profile快捷键Command I。会调用Instruments选择Activity Monitor 模板 Activity Monitor打开之后是这个样子所有都是空的 当运行的设备和运行的app都准备好了我们开始运行Activity Monitor点击左上角的红色圆点按钮开始记录手机中CPU和内存的使用情况得到下图 我们分析一下这些图的意思 %CPU不同进程对CPU的占比 CPU TimeCPU运行时间 Real Memory Usage进程使用的内存量用了饼状图和柱状图展示 上图只是这些数据的大概结果我们可以去查看具体的数据点击上图4个任意自己想要查看信息的图片分析的结果有4种分析结果【Summary、Parent Child、Samples、Console】我们一个个来分析 1Summary(Summary of data) ---------Process进程使用内存、CPU使用时长等摘要信息 其中参数的含义如下 process id ——进程id process name ——进程名 user name——用户名 %CPU——cpu占比 threads——线程 real mem——真正使用的内存 virtual mem——虚拟内存 architecture——架构 cpu time——CPU时间 sudden term——突然项N/A不适用 2Parent Child( parent child information)-----父进程和子进程的关系以及各个进程的概要信息 它的参数与Summary是一样的内容也是一样的。但是它具有层级关系即父子关系子进程在父进程的下一层级。父进程上可以展开、关闭它的所有子进程 3Samples(a list of samples) ----一系列抽样即不同时间CPU使用时间、内存使用情况的样本值 参数的含义如下 Physical Memory Wired——操作系统占用的内存Physical Memory Active——除操作系统外其它进程占用的内存Physical Memory Inactive——最近被释放的内存Physical Memory Used——profiling当前进程时使用的总内存Physical Memory Free——当前的可用内存Total VM Size——虚拟内存的占用量 4Console即控制台输出的日志Log信息 提示 Activity Monitor默认配置了在Timeline面板中显示的内容包括 TotalVMSize、 CPUTotalLoad、 CPUUserLoad、 CPUSystemLoad在使用时可以根据自己的需要选择相关的分析内容进行显示并且不同的内存使用部分可以使用不同的颜色加以区分下面就是Activity Monitor在使用过程中的界面截图在右下角可选择内存相关的分析内容。 下面我们将根据需要对Activity Monitor监控的内容进行分类介绍 二、Activity Monitor监控内存使用情况 Examining Memory Usage with the Activity Monitor Trace Template The Activity Monitor trace template monitors overall system activity and statistics, including CPU, memory, disk, and network. It consists of the Activity Monitor instrument only, although you can add additional instruments to a trace document you’ve created with the template, if you desire. You’ll see later that the Activity Monitor is also used to monitor network activity on iOS devices. The Activity Monitor instrument captures information about the load on the system measured against the virtual memory size. It can record information from a single process or from all processes running on the system. The Activity Monitor instrument provides you with four convenient charts for a quick, visual representation of the collected information. The two charts that specifically describe memory usage are: Real Memory Usage (bar graph). Shows the top five real memory users in a bar graph. Real Memory Usage (pie chart). Shows the top five real memory users with the total memory used displayed. 下图为Activity Monitor instrument with charts The Record Settings area in the inspector sidebar includes a list of system statistics, which can be configured to appear in the track pane and graphically represent collected data. Select a statistic’s checkbox to see it graphed in the track pane. Click the shape or the color well to change how a statistic appears in the track pane. There are a number of statistics the Activity Monitor instrument supports, but the following ones are memory-specific: Physical Memory Wired Physical Memory Active Physical Memory Inactive Physical Memory Used Physical Memory Free Total VM Size VM Page In Bytes VM Page Out Bytes VM Swap Used If one of the statistics above doesn’t appear under System Statistics, locate it under “Select statistics to list” and click its checkbox to include it in the list. 三、Activity Monitor监控CPU情况 There are a number of statistics the Activity Monitor instrument supports, but the following ones are memory-specific: CPUTtotalLoad CPUUserLoad CPUSystemLoad CPUNiceLoad If one of the statistics above doesn’t appear under System Statistics, locate it under “Select statistics to list” and click its checkbox to include it in the list. 下图为Activity Monitor instrument tracing CPU packets 四、Activity Monitor监控网络情况 By default, the Activity Monitor template isn’t set up to display network activity. Therefore, you need to enable the desired network-related statistics in the Record Settings area in the inspector sidebar for the Activity Monitor instrument to see which processes are sending and receiving information. There are a number of statistics the Activity Monitor instrument supports, but the following ones are network-specific: Net Packets In Net Bytes In Net Packets Out Net Bytes Out Net Packets In Per Second Net Packets Out Per Second Net Bytes In Per Second Net Bytes Out Per Second If one of the statistics above doesn’t appear under System Statistics in the Record Settings inspector, locate it under “Select statistics to list” and click its checkbox to include it in the list. Once you have gathered network activity for your app, examine it carefully to pinpoint areas where your app is sending out excessive amounts of information and therefore tying up valuable device resources. When you minimize the amount of information sent and received, you can benefit from increased performance and response times in your app. 下图为Activity Monitor instrument tracing network packets
