[GitHub] [incubator-echarts] neewbee opened issue #8988: Possible GPU memory leak

[GitHub]

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### One-line summary [问题简述]

GPU memory grows rapidly when scatterGL reload

### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]: 4.1.0
+ Browser version [浏览器类型和版本]: chrome 68.0.3440.106（正式版本） （64 位）
+ OS Version [操作系统类型和版本]: window10  64

### Expected behaviour [期望结果]

not growing?

### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option，注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的 
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
```javascript
option = {
  backgroundColor: '#000',
  title: {
    text: '10000000 GPS Points',
    left: 'center',
    textStyle: {
      color: '#fff'
    }
  },
  geo: {
    map: 'world',
    roam: true,
    label: {
      emphasis: {
        show: false
      }
    },
    silent: true,
    itemStyle: {
      normal: {
        areaColor: '#323c48',
        borderColor: '#111'
      },
      emphasis: {
        areaColor: '#2a333d'
      }
    }
  },
  series: [{
    name: '弱',
    type: 'scatterGL',
    progressive: 1e6,
    coordinateSystem: 'geo',
    symbolSize: 1,
    zoomScale: 0.002,
    blendMode: 'lighter',
    large: true,
    itemStyle: {
      color: 'rgb(20, 15, 2)'
    },
    postEffect: {
      enable: true
    },
    silent: true,
    dimensions: ['lng', 'lat'],
    data: new Float32Array()
    // data: []
  }]

```




### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
<!-- [例如，截图或线上实例 (JSFiddle/JSBin/Codepen)] -->
![image](https://user-images.githubusercontent.com/13777940/44892989-7811fd80-ad1a-11e8-9e8a-89b3db6b87d6.png)


http://111.231.57.117:8080/  scatterGL
http://111.231.57.117:8081/  scatter
or
http://echartsjs.com/examples/editor.html?c=scatterGL-gps&gl=1

trace file
chrome://tracing/
[trace_tracing.json.gz](https://github.com/apache/incubator-echarts/files/2338765/trace_tracing.json.gz)


[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/8988 ]
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