Sus­pend and re­sume your com­puter

Linux Format - - ESCAPE WINDOWS -

We’ve talked about what hap­pens when you start your com­puter from cold, and touched on what hap­pens when you shut down, but that isn’t the only way of turn­ing a com­puter on and off.

Sleep and hi­ber­na­tion are ways of turn­ing a com­puter off with­out turn­ing it off. They save the com­puter’s cur­rent state and re­store it when it’s turned back on. This saves time on both shut­down and startup and also means you can carry on where you left off with all your ap­pli­ca­tions still open.

While orig­i­nally in­tended for lap­tops, sleep and hi­ber­nate are be­com­ing in­creas­ingly pop­u­lar for desk­tops too. In sleep mode, the com­puter en­ters a low-power mode where the con­tents of mem­ory are pre­served but most other func­tions are shut down. This gives in­stant restarts but still con­sumes some power be­cause the mem­ory is kept alive. Hi­ber­nate saves the con­tents of mem­ory to your hard disk, usu­ally in the swap par­ti­tion, be­fore shut­ting down the com­puter. On re­boot, the ker­nel spots the pres­ences of hi­ber­nated data and loads it back into mem­ory.

Us­ing a com­bi­na­tion of th­ese two means you may never need to shut­down or re­boot your com­puter un­less you up­date the ker­nel or want to add hard­ware.

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