All language subtitles for 6_I-O Management

So far we've learned how hard our kernel
works by handling files, managing

file storage, juggling all the different
processes running on our computer, and

allocating memory.

Another important task that our kernel
handles is managing input and output.

We refer to devices that perform input and
output as I/O devices.

These include our monitors,
keyboards, mice, hard disk drives,

speakers, Bluetooth headsets,
webcams and network adapters.

These I/O devices are all
managed by our kernel,

the kernel needs to be able to
load up drivers that are used so

that we can recognize and speak to
these different types of hardware.

When the kernel is able to start
the drivers to communicate with hardware,

it also manages the transfer of
data in and out of the devices.

I/O doesn't just mean the transfer
of data between us and our devices.

The devices also need to be
able to talk to each other.

Our kernel handles all the inter
communication between devices.

It also figures out what the most
efficient method of transfer is and

it tries its best to make sure our data
doesn't have errors during process.

When you're troubleshooting or
solving a problem with a slow

machine it's usually some sort
of hardware resource deficiency.

If you don't have enough RAM you
can't load up as many processes.

If you don't have enough CPU you
can't execute programs fast enough.

If you have too much input coming into the
device or too much output going somewhere

you'll also block other data
from being sent or received.

It's slow is one of the most
common problems you'll solve in

an IT support role.

Knowing the potential sources of that
slowness is a big help when you're trying

to narrow down the cause of the latency.

Troubleshooting is such an important
part of any IT support role.

Beyond desktop support, identifying
the source of a resource bottleneck and

a server or large IT system like a Web
application can unlock performance gains

and new heights of responsiveness for
your users.