每隔一段时间从数据库中读取数据后，如何像任务管理器中cpu使用率那样曲线显示，有什么开源实现吗
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每隔一段时间从数据库中读取数据后，如何像任务管理器中cpu使用率那样曲线显示，有什么开源实现吗
开始没弄明白题主想问的什么,以为是问怎么取数据,原来是想问怎么动态的展示数据.
推荐两个,一个是国外的Highcharts,一个是百度的ECharts
下面这两个官方demo应该就是你要的效果吧.
http://www.hcharts.cn/demo/index.php?p=46
http://echarts.baidu.com/demo.html#dynamic-data2
用ajax吧，每隔一段时间请求一次
服务器主动推数据 webSocket
搜索：workerman , swoole.
推荐hightchart，用过，不错，有中文社区
ajax轮询或者websocket
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