写或打印，哪个更快？

After doing the following test:

做完以下测试后：

for( i = 0; i < 3000000; i++ ) {
    printf( "Test string\n" );
}

for( i = 0; i < 3000000; i++ ) {
    write( STDOUT_FILENO, "Test string\n", strlen( "Test string\n" ) );
}
fo