trace-event-format-analyzer

Analyze events in Trace Event Format

Parameters

• --complete-events (default '') - names of complete events to analyze
• --decimal-places (default 4) - number of decimal places of output statistics
• --duration-events (default '') - names of duration events to analyze
• --immediate-events (default '') - names of immediate events to analyze
• --output (default false) - outputs summary to json file for each provided path: [pathFileName].summary.json
• --paths (default '') - separated paths to Trace Event Format json files
• --separator (default ',') - separator which will be used to separate other params
• --silent (default false) - disables output to console
• --unique-events (default false) - runs unique events analyzer which creates list of all unique events in json file
• --verbose (default false) - enables verbose output

Example

yarn install

node build/main.js
    --paths='/path/to/trace/event/format/json'
    --complete-events='Paint'
    --duration-events='Layout'
    --immediate-events='DrawFrame'
    --output

Output format

Summary

{
    completeEvents: {
        [eventName: string]?: StatisticsGroup
    },
    durationEvents: {
        [eventName: string]?: StatisticsGroup
    },
    immediateEvents: {
        [eventName: string]?: StatisticsGroup
    },
    uniqueEvents?: string[],
}

StatisticsGroup

Dictionary

• deltas - calculated on time between events (complete, immediate) or time between corresponding pairs of events (begin-end for duration events)
• eps - events per second (1000 / delta)

{
    deltas: Statistics,
    eps: Statistics
}

Statistics

{
    min: number[ms],
    mean: number[ms],
    percentiles: {
        50: number[ms],
        66: number[ms],
        75: number[ms],
        80: number[ms],
        90: number[ms],
        95: number[ms],
        98: number[ms],
        99: number[ms],
        100: number[ms]
    },
    standardDeviation: number[ms],
    variance: number[ms]
}

License

MIT