Add enable_profiling in Runtime Options

[xiaofeihan1]

Background

Previously, developers could only enable profiling through genai_config.json, which profiles the entire lifetime of a session—from session creation to session destruction. When the number of runs is large (for example, generating ~3000 tokens during inference), the profiling output can become excessively large, causing profiling to fail due to oversized files.

2025-12-17 11:17:36.496 Python[9861:2179219] 2025-12-17 11:17:36.493043 [E:onnxruntime:onnxruntime-genai, profiler.cc:93 EndTimeAndRecordEvent] Maximum number of events reached, could not record profile event.

Description

This PR addresses this limitation by introducing run-level profiling. We expose enable_profiling in RuntimeOptions. Developers can now enable profiling for specific runs only.

With the following code, two profiling JSON files will be generated using the run_profiler_file prefix:
• one containing profiling data for the 100th run
• another containing profiling data for the 101th run

while not generator.is_done():
    if len(new_tokens) == 100 or len(new_tokens) == 101 :
        generator.set_runtime_option("enable_profiling", "run_profiler_file")
    else:
        generator.set_runtime_option("enable_profiling", "0")
    generator.generate_next_token()
    new_token = generator.get_next_tokens()[0]
    new_tokens.append(new_token)

[kunal-vaishnavi]

Do we need to specify a version here or would not listing a version and using the latest nightly package be sufficient?

[kunal-vaishnavi]

These are default values for publishing the official packages for ORT GenAI. I think we should keep the defaults as a stable version of ORT. We can always override what version of ORT to use when the packages are built.

[kunal-vaishnavi]

1. Why is converting a char* to basic_string<ORTCHAR_T> before going back to a char* needed?
2. Can you add a comment here to explain that this else condition is for a custom prefix for the log file?
3. Can the else if and else conditions be merged since they both enable profiling?