aquavm/tools/cli/air-trace

The air-trace utility

The main propose of this utility is to run AquaVM with data and analyze its performance. It has two subcommands: run and stats.

air-trace run

Executes an AIR script with data in WASM AquaVM. It has two modes of parameter input: plain and anomaly.

Common parameters

All common parameters are optional. Their position is before the mode selector (--plain or --anomaly).

• --call-results PATH parameter allows you to provide call results for current execution.
• --max-heap-size N defines maximum heap size for WASM runtime.
• --interpreter PATH option defines the AquaVM WASM binary to be executed. By default, it is "target/wasm32-wasi/release/air_interpreter_server.wasm", but you can define a global value with the AIR_INTERPRETER_WASM_PATH environment variable. The default presumes that the tool is run from the root of this repository. Feel free to use option or environment variable to run from any location.
• with the --json option, tracing info is output (to stderr) in machine-readable JSON format. The output can be later processed with air-trace stats subcommand.
• --tracing-params defines tracing logging levels for AquaVM. By default, it is equal to info and does trace the most high-level AquaVM constructions (data parsing, AIR script parsing, execution). With debug level it traces some individual commands, and with trace level it traces even more fine grained functionality, but it induce more overhead.
• --runner-tracing-params defines tracing logging level for the runner. By default, it is equal to warn.

The important option is --native. It runs the AquaVM as the native code that can be profiled with any native profiler. As input data deserialization and serialization time can be comparable to particle execution time, and short execution times provides less reliable results, one can use --repeat N option to repeat particle execution several times. Execution result is not printed in this case, so you may run --repeat 1 to suppress it.

Run air-trace run --help to see all common parameters.

Plain mode

In the --plain mode, the parameters like AIR script path, data path, previous data path and other particle fields can be provided in separate arguments, of which only --data is the required one (and AIR script is read from stdin by default).

Run air-trace run --plain --help to see all plain mode options.

Anomaly mode

In the anomaly mode, the only argument is a path to self-contained anomaly data file obtained from Anomaly Particle Detection System.

Run air-trace run --anomaly --help to see all anomaly mode options.

air-trace stats

This subcommand allows to process JSON trace collected with air-trace run --json. It has two primary options:

• --pretty outputs JSON trace in human readable format.
• --stats outputs execution summary.

By default, both options are effective.

The --sort-stats-by-duration flag sorts spans by time, not by name, in the report.

Please, note that currently tracing outputs to stdout, and execution result is also printed to stdout. You may suppress printing the result with air-trace run --repeat 1 option.

Known limitations

1. At detailed tracing levels (debug etc), trace formatting time is comparable to traced code execution time and can give incorrect results.

Installation

AIR interpreter server

You need the marine tool installed. Run following command in the repo's root directory:

marine build --features marine --package air-interpreter --release

It will output the binary to default --interpreter path at target/wasm32-wasi/release/air_interpreter_server.wasm; if you wish to run the air-trace from arbitrary place, store the air_interpreter_server.wasm binary in a cool dry place and set AIR_INTERPRETER_WASM_PATH variable.

air-trace binary

You need to have Rust toolchain and its cargo utility installed. Run this command from the repo's root directory:

cargo install --path tools/cli/air-trace

air-trace native build

You can have fully native or WASM air-trace build with the following commands:

cargo build --no-default-features --release -p air-trace
cargo build --no-default-features --release -p air-trace --target wasm32-wasi

This build doesn't need the AIR interpreter server binary.