How to disable/turn-off drupal 7 caching permanently, to not to mess with module's operations? I am using Drupal 7 for a real time web application so I cannot afford any caching at all. I also could not find any such option in performance section of Admin Panel. Kindly suggest a method with involving the command line.



UPDATED:

Let me explain the problem further.

Yes theme isn't problem for me. I am new to drupal ad still exploring.

What problem I face is I have written a module which takes CSV file from user, parses and calls moodle web-services to perform operations. What happens sometimes is it seems like that data or code in module is not managed properly and it generates useless/meaningless errors. When I do 'Clear All Caches' at Home » Administration » Configuration » Development; everything gets fixed.
As per Suppress caching (for development), you can add the following to your settings.php file

if (!class_exists('DrupalFakeCache')) {
  $conf['cache_backends'][] = 'includes/cache-install.inc';
}
// Default to throwing away cache data
$conf['cache_default_class'] = 'DrupalFakeCache';
// Rely on the DB cache for form caching - otherwise forms fail.
$conf['cache_class_cache_form'] = 'DrupalDatabaseCache';


I'd recommend you don't just blindly add that, though. Instead, take the time to think what you do need to cache, and what you don't need to cache, and come up with a proper strategy. For example, it's hardly likely that you need rebuild the cache of hook implementations on every single page load, regardless of how highly available the site is.