Re: [PATCH v3 2/8] test-tool genzeros: generate large amounts of data more efficiently

> @@ -12,9 +15,19 @@ int cmd__genzeros(int argc, const char **argv)
>  
>  	count = argc > 1 ? strtoimax(argv[1], NULL, 0) : -1;
>  
> -	while (count < 0 || count--) {
> -		if (putchar(0) == EOF)
> +	/* Writing out individual NUL bytes is slow... */
> +	while (count < 0)
> +		if (write(1, zeros, ARRAY_SIZE(zeros)) < 0)
>  			return -1;
> +
> +	while (count > 0) {
> +		n = write(1, zeros, count < ARRAY_SIZE(zeros) ?
> +			  count : ARRAY_SIZE(zeros));
> +
> +		if (n < 0)
> +			return -1;
> +
> +		count -= n;
>  	}
>  
>  	return 0;