i see always that there is confusion in this term, i found this in wikipedia:
In website hosting, the term “bandwidth” is often incorrectly used to describe the amount of data transferred to or from the website or server within a prescribed period of time, for example bandwidth consumption accumulated over a month measured in gigabytes per month. The more accurate phrase used for this meaning of a maximum amount of data transfer each month or given period is monthly data transfer.
How this is measured? if a user uploads a video, then the cost will be upload + download x (number of views) ?
What is the meaning of unlimitied in hosting bandwidth?
If there is a limit care about bandwidth, is this the REAL cause of using a Thread Based Server (limiting server ressources) instead of using an Event Driven?
ie: in event driven, there is no physical limit consumed compared to thread based, in thread based every thread will be created will consume memory and cpu ressources! not for event driven than solves the 10k problem, so i guess thread based is used to force machine to stop and waits for other clients to be replaced!
Typically, on shared hosting servers bandwidth is calculated from Apache web server logs, FTP service logs and maybe some other services.
Calculated traffic is a sum of filesizes transferred by apache etc, so it may not include traffic “outside” these “easy to calculate bandwidth” services. MySQL traffic may be not included for example.
Shared hosting means, that one server is running many websites and user (hosting customer) accounts.
On dedicated servers and virtual machines – traffic calculation usually is based on network driver/interface informations – its more precise and service-independent.
Meaning of unlimitied in hosting bandwidth – it may mean, that your hosting service is connected to Internet by network inteface, that is too slow, to exceed very big month transfer assigned to one user/customer of hosting provider.
Generally – hosting providers have to pay for transfer for their internet providers. Their bill is based not only on connection speed, like “home internet services”.