pmu 相关数据interval 字段计算不准

如下代码中， 如果存在多个topic，那么第二个topic 计算的 data->interval  是瞬时完成的
```
void PmuUncoreCollector::Run()
{
    if (pmuId != -1) {
        PmuUncoreData *data = new PmuUncoreData();
        PmuDisable(pmuId);
        data->len = PmuRead(pmuId, &(data->pmuData));
        PmuEnable(pmuId);

auto now = std::chrono::high_resolution_clock::now();
        data->interval = std::chrono::duration_cast<std::chrono::milliseconds>(now - timestamp).count();
        timestamp = now;

DataList dataList;
        dataList.topic.instanceName = new char[name.size() + 1];
        strcpy_s(dataList.topic.instanceName, name.size() + 1, name.data());
        dataList.topic.topicName = new char[topicStr.size() + 1];
        strcpy_s(dataList.topic.topicName, topicStr.size() + 1, topicStr.data());
        dataList.topic.params = new char[1];
        dataList.topic.params[0] = 0;
        dataList.len = 1;
        dataList.data = new void* [1];
        dataList.data[0] = data;
        Publish(dataList);
    }
}
```

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