Stress Database

bash$ time seq 1500 | parallel -n0 ./run.sh

bash$ cat run.sh
#!/usr/bin/sh
php test.php

bash$ cat test.php
#!/usr/bin/php
<?php
function make_seed() {
  	list($usec, $sec) = explode(' ', microtime());
  	return (float) $sec + ((float) $usec * 100000);
}

function generar_idtrack() {
	srand(make_seed());
	$dimension = rand(4, 10);

	$arr_abc123= array( '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k',
							'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'y', 'y', 'z' );
	$randval="";
	for( $i=0; $i<$dimension; $i++ )
		$randval .= $arr_abc123[rand(1, count($arr_abc123))];

	return $randval;
}

$r= generar_idtrack();

if( $r ) {
	$userDb= '_username_db_';
	$passDb= '_password_db_';
	$hostDb= '_server_db_';
	$nameDb= '_database_name_';

	$q= "insert into PERSONAS(NOMBRE) values('jorge');";

	$link=mysqli_connect($hostDb, $userDb, $passDb, $nameDb);
	mysqli_query($link, $q);
	mysqli_close($link);
}
exit(0);
?>