1{
2  "traceEvents": [
3    {"name": "us1", "ph": "B", "pid": 1, "tid": 1, "ts": 0},
4    {"name": "us1", "ph": "E", "pid": 1, "tid": 1, "ts": 1.1},
5    {"name": "us2", "ph": "B", "pid": 1, "tid": 1, "ts": 1.1},
6    {"name": "us2", "ph": "E", "pid": 1, "tid": 1, "ts": 1.3},
7    {"name": "us3", "ph": "B", "pid": 1, "tid": 1, "ts": 1.3},
8    {"name": "us3", "ph": "E", "pid": 1, "tid": 1, "ts": 1.6},
9    {"name": "us4", "ph": "B", "pid": 1, "tid": 1, "ts": 1.7},
10    {"name": "us4", "ph": "E", "pid": 1, "tid": 1, "ts": 2.1},
11
12    {"name": "ns1", "ph": "B", "pid": 1, "tid": 1, "ts": 3.000},
13    {"name": "ns1", "ph": "E", "pid": 1, "tid": 1, "ts": 3.011},
14    {"name": "ns2", "ph": "B", "pid": 1, "tid": 1, "ts": 3.011},
15    {"name": "ns2", "ph": "E", "pid": 1, "tid": 1, "ts": 3.013},
16    {"name": "ns3", "ph": "B", "pid": 1, "tid": 1, "ts": 3.013},
17    {"name": "ns3", "ph": "E", "pid": 1, "tid": 1, "ts": 3.016},
18    {"name": "ns4", "ph": "B", "pid": 1, "tid": 1, "ts": 3.017},
19    {"name": "ns4", "ph": "E", "pid": 1, "tid": 1, "ts": 3.021}
20  ],
21  "displayTimeUnit": "ns"
22}