test/sample-compare.html

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<!doctype html>
<html>
	<head>
		<meta charset='utf-8'>
		<title>Downsample Comparasions</title>
		<meta name='viewport' content='width=device-width, initial-scale=1'>
	</head>
	<body>
		<style>
			.chart {
				width: 800px;
				height: 400px;
			}
		</style>
		<h2 id='status'>Loading lib....</h2>
		<div id='container'></div>

        <script src='lib/simpleRequire.js'></script>
        <script src='lib/config.js'></script>
		<script>
            require([
                'echarts',
				'data/large-data.json'
            ], function (echarts, packedData) {
					function round2(val) {
						return Math.round(val * 100) / 100;
					}

					function round3(val) {
						return Math.round(val * 1000) / 1000;
					}

					function prepData(packed) {
						console.time('prep');

						// epoch,idl,recv,send,read,writ,used,free

						var numFields = packed[0];
						packed = packed.slice(numFields + 1);

						var repeatTimes = 5;

						var data = new Float64Array((packed.length / numFields) * 4 * repeatTimes);

						var off = 0;
						var date = packed[0];
						for (let repeat = 0; repeat < repeatTimes; repeat++) {
							for (let i = 0, j = 0; i < packed.length; i += numFields, j++) {
								date += 1;
								data[off++] = date * 60 * 1000;
								data[off++] = round3(100 - packed[i + 1]);
								data[off++] = round2(
									(100 * packed[i + 5]) / (packed[i + 5] + packed[i + 6])
								);
								data[off++] = packed[i + 3];
							}
						}
						console.timeEnd('prep');

						return data;
					}

					function makeChart(data, title, sampling) {
						var container = document.getElementById('container');
						var dom = document.createElement('div');
						var titleDom = document.createElement('h3');
						dom.classList.add('chart');
						if (title !== 'warmup') {
							container.appendChild(titleDom);
							container.appendChild(dom);
						}
						var myChart = echarts.init(dom, null, {
							width: 800,
							height: 400
						});

						titleDom.innerHTML = title;

						let opts = {
							animation: false,
							dataset: {
								source: data,
								dimensions: ['date', 'cpu', 'ram', 'tcpout']
							},
							tooltip: {
								trigger: 'axis'
							},
							legend: {},
							grid: {
								containLabel: true,
								left: 0,
								top: 50,
								right: 0,
								bottom: 30
							},
							xAxis: {
								type: 'time'
							},
							yAxis: [{
								type: 'value',
								max: 100,
								axisLabel: {
									formatter: '{value} %'
								}
							}, {
								type: 'value',
								max: 100,
								axisLabel: {
									formatter: '{value} MB'
								}
							}],
							series: [{
								name: 'CPU',
								type: 'line',
								showSymbol: false,
								sampling: sampling,
								lineStyle: { width: 1 },
								emphasis: { lineStyle: { width: 1 } },
								encode: {
									x: 'date',
									y: 'cpu'
								}
							}, {
								name: 'RAM',
								type: 'line',
								yAxisIndex: 1,
								showSymbol: false,
								sampling: sampling,
								lineStyle: { width: 1 },
								emphasis: { lineStyle: { width: 1 } },
								encode: {
									x: 'date',
									y: 'ram'
								}
							}, {
								name: 'TCP Out',
								type: 'line',
								yAxisIndex: 1,
								showSymbol: false,
								sampling: sampling,
								lineStyle: { width: 1 },
								emphasis: { lineStyle: { width: 1 } },
								encode: {
									x: 'date',
									y: 'tcpout'
								}
							}]
						};
						const startTime = Date.now();
						myChart.setOption(opts, {
							notMerge: true
						});
						const endTime = Date.now();
						titleDom.innerHTML = `${title}(${data.length / 4 * 3}) ${(endTime - startTime).toFixed(0)} ms`;
					}
					let status = document.getElementById('status');

					status.textContent = 'Warming up';
					let data = prepData(packedData);

					for (let i = 0; i < 5; i++) {
						makeChart(data, 'warmup');
						makeChart(data, 'warmup', 'lttb');
						makeChart(data, 'warmup', 'average');
						makeChart(data, 'warmup', 'max');
					}
					status.textContent = 'Running';
					makeChart(data, 'No Sampling', null);
					setTimeout(() => makeChart(data, 'LTTB Sampling', 'lttb'), 200);
					setTimeout(() => makeChart(data, 'Max Sampling', 'max'), 400);
					setTimeout(() => makeChart(data, 'Average Sampling', 'average'), 600);
      });
		</script>
	</body>
</html>