Debugging

Print Statements

Use print calls for basic debugging, which will be present in node or studio output.

Use gl.trace to include time stamps in the output (it will be written to genvm_log instead of stdout)

Profiling

There is also gl.trace_time_micro which returns timestamp in the GenVM debug mode. Default bootloader includes possibility to enable profiling by setting environment variable GENLAYER_ENABLE_PROFILER=true.

# {
#   "Seq": [
#     { "SetEnv": { "name": "GENLAYER_ENABLE_PROFILER", "value": "true" } },
#     { "Depends": "py-genlayer:test" }
#   ]
# }

This will output base-64 encoded gzip-compressed profiling data to stderr after every single VM execution

Attaching a Debugger