Fix the recv_buffer issue encountered during LLaMA3 training

[whollo]

Fix the problem with recv_buffer encountered in the process of LLaMA3 training

[gemini-code-assist]

Summary of Changes

Hello @whollo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the robustness of the flagcx library by making environment variable checks for boolean "TRUE" values case-insensitive. This change addresses potential issues where features might not activate correctly if the environment variable is set to "True" instead of "TRUE", thereby improving the reliability of components like topology detection and cost model estimation, which are crucial for processes like LLaMA3 training.

Highlights

• Case-Insensitive Environment Variable Checks: Modified several strcmp calls across the codebase to recognize both "TRUE" and "True" when evaluating environment variables, enhancing flexibility and preventing issues caused by strict case sensitivity.
• Improved Robustness: Ensures that critical features dependent on these environment variables, such as topology detection, cost model estimation, and network initialization, are correctly enabled regardless of the capitalization used for the boolean "TRUE" value.

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[gemini-code-assist]

Code Review

This pull request addresses an issue with an environment variable check by accepting "True" in addition to "TRUE". While this improves usability, the implementation introduces duplicated logic across four files. A more robust and maintainable solution would be to use a case-insensitive string comparison function like strcasecmp. This would handle all variations of 'true' (e.g., 'TRUE', 'True', 'true') and simplify the code. I've provided specific suggestions for each file to use strcasecmp. For long-term maintainability, I recommend abstracting this logic into a shared utility function.

[gemini-code-assist]

Instead of checking for "TRUE" and "True" separately, using a case-insensitive comparison would be more robust and cleaner. The strcasecmp function (from <strings.h>) can handle all cases like "TRUE", "True", and "true" with a single call, simplifying the code. This same pattern is repeated in other files in this pull request.

      strcasecmp(enableTopoDetect, "TRUE") == 0) {

[gemini-code-assist]

To make the environment variable check more robust, consider using a case-insensitive string comparison. The strcasecmp function from <strings.h> would handle all variations like "TRUE", "True", and "true", which simplifies the condition and improves maintainability.

Suggested change

	if (env && (strcmp(env, "TRUE") == 0 || strcmp(env, "True") == 0)) {
	if (env && strcasecmp(env, "TRUE") == 0) {

[gemini-code-assist]

A case-insensitive comparison using strcasecmp (from <strings.h>) would be a more robust and cleaner way to check this environment variable. It would handle various capitalizations like "TRUE", "True", and "true" in a single function call.

      (strcmp(enable_topo_detect, "TRUE") == 0 || strcasecmp(enable_topo_detect, "True") == 0)) {

[gemini-code-assist]

This logic for checking the environment variable is duplicated in several files. Using a case-insensitive comparison like strcasecmp would simplify this condition and make it more robust. To improve maintainability and avoid code duplication, consider creating a shared helper function for this check.

    if (enableTopoDetect && strcasecmp(enableTopoDetect, "TRUE") == 0) { // safety check nic distance is only

[MC952-arch]

This env is useless and we can remove it.

[MC952-arch]

Try strcasecmp instead