update error reporting

[debermudez]

Attempt to improve the logging for genai-perf.

• Adds a logging config
• creates a logging file for warns and up
• outputs logging statements to console as well
• some boy scout clean up as well

Some example output
Using a modified profile_export.json that removed response timestamps from the first request entry.
Before:
genai-perf - ERROR - 'response_timestamps'

After:

Traceback (most recent call last):
  File "/workspace/client/src/c++/perf_analyzer/genai-perf/genai_perf/main.py", line 147, in run
    data_parser = calculate_metrics(args, tokenizer)
  File "/workspace/client/src/c++/perf_analyzer/genai-perf/genai_perf/main.py", line 89, in calculate_metrics
    return LLMProfileDataParser(
  File "/workspace/client/src/c++/perf_analyzer/genai-perf/genai_perf/llm_metrics.py", line 475, in __init__
    super().__init__(filename)
  File "/workspace/client/src/c++/perf_analyzer/genai-perf/genai_perf/llm_metrics.py", line 406, in __init__
    self._parse_profile_data(data)
  File "/workspace/client/src/c++/perf_analyzer/genai-perf/genai_perf/llm_metrics.py", line 416, in _parse_profile_data
    metrics = self._parse_requests(requests)
  File "/workspace/client/src/c++/perf_analyzer/genai-perf/genai_perf/llm_metrics.py", line 489, in _parse_requests
    res_timestamps = request["response_timestamps"]
KeyError: 'response_timestamps'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/workspace/client/src/c++/perf_analyzer/genai-perf/genai_perf/main.py", line 157, in main
    run()
  File "/workspace/client/src/c++/perf_analyzer/genai-perf/genai_perf/main.py", line 151, in run
    raise GenAIPerfException(e)
genai_perf.exceptions.GenAIPerfException: 'response_timestamps'
2024-04-19 16:35 [ERROR] genai_perf.main:161 - 'response_timestamps'

The error message now contains time info, module where the error occurred, and line numbers.
The console will also display the traceback for easier debugging.

[rmccorm4]

Couple requests to make it easier to grok the cosmetic and functional changes:

1. Can you add before and after outputs of stdout logging for the happy path to the description?

2. Can you also show an example of output from an error? Does it only go to file, stdout, or both?

[debermudez]

(edited by Ryan): Moved to thread: #597 (comment)

[dyastremsky]

Thank so much for making this change, Elias! This will speed up debugging during development significantly.