[PATCH v6] Improve the performance of --num-threads -d 31

[Minfei Huang]

On 04/14/16 at 01:42pm, Zhou Wenjian wrote:
> @@ -10223,6 +10263,20 @@ calculate_cyclic_buffer_size(void) {
>  	 *  free memory for safety.
>  	 */
>  	limit_size = get_free_memory_size() * 0.6;
> +
> +	/*
> +	 * Recalculate the limit_size according to num_threads.
> +	 * And reset num_threads if there is not enough memory.
> +	 */
> +	if (limit_size - maximum_size < THREAD_REGION * info->num_threads) {
> +		MSG("There isn't enough memory for %d threads.\n", info->num_threads);
> +
> +		info->num_threads = MAX(0, limit_size - maximum_size) / THREAD_REGION;

Hi, Zhou.

Since both limit_size and maximum_size are unsigned long long,
comparison is necessary for the if branch. Thus the micro MAX can be
removed as well.

Thanks
Minfei