Re: Multiprocess

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Hi Anders,

please read the FAQ about that subject,

	http://dar.linux.free.fr/doc/FAQ.html#parallel

if you have any idea or objection, feel free to present them here.

Kind Regards,
Denis.

Anders Bo Rasmussen a écrit :
> Hi.
> 
> I'm using dar to backup up my private files and I'm happy about it. 
> 
> I however see that when I take backup up of my home directory to a usb
> 2.0 disk, dar uses on average 50% cpu, but sometimes peaks at 100% cpu
> of one core. When it peaks at 100% cpu the backup to the usb is slower
> than optimal - this can easily be seen by delays in the blinking LED. I
> use both encryption and compression, so this probably happens when there
> is data that can be compressed a lot.
> 
> If I bought a USB 3.0 drive it would probably wait for the CPU all the
> time. 
> 
> Of course I could set the compression level lower (it is currently 6),
> which would make less cpu usage and at the same time write more data to
> the drive.
> 
> But wouldn't it be good to have dar multiprocess? I see some possible
> benefits:
> 
> * Multiple processes that could compress and encrypt (I don't know if
> the encryption is possible or it has to be encrypted as one big stream)
> would increase the available cpu power.
> * Possible buffered output, so there would be e.g. 500MB of unwritten
> data, that could be used for when the "hard cpu times" comes.
> * Possible buffered input, so small files could be read ahead, and
> therefore not make a gab in feeding the compression/encryption.
> 
> /Anders
> 
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