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Ayden Meng
a058a2856d
When the number of build threads multiplied by per-thread file descriptor usage exceeds the system's open file descriptor limit, some threads may fail to acquire necessary resources (e.g., pipes or semaphores), leading to deadlocks or hangs during parallel builds. To prevent this situation, calculate the safety upper limit of concurrency by dividing the system's maximum file descriptor limit by 3 (An empirical value derived from balancing performance overhead against the theoretical number of file descriptors consumed per thread). The actual thread count is then clamped to this safe value. Other usages of ThreadNum()—such as during actual compilation or log queue creation—do not significantly contribute to file descriptor consumption. Therefore, adjusting ThreadNum() globally would be unwarranted, as it could unnecessarily restrict parallelism in stages that are not FD-bound. This ensures stable parallel builds even under constrained resource limits. Signed-off-by: Ayden Meng <mengxiangdong@loongson.cn>