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Slower unrar on Nas than same drive

Posted: September 26th, 2012, 4:12 am
by .maxx
Hi guys,

my infrastructure:
- mac mini i5 2,3ghz 8gb ram
- internal samsung 830 SSD (temp download folder)
- external synology nas ds412+ (4 drives storage, 115MB/s read/write tested over afp)
- osx 10.8.2
- sabnzbd 0.7.4RC1 on the mac

the problem:
- unrar file from internal SSD to NAS -> 50-55MB/s
- unrar same file from internal SSD to same SSD -> 85-90MB/s
- tested with different large files (15-20GB)

- copy the extracted file in finder from SSD to NAS -> 110MB/s

Why is unrar to nas slower than on the same SSD?
Please help!

Re: Slower unrar on Nas than same drive

Posted: September 26th, 2012, 4:55 am
by shypike
People have observed this before.
However, the cause is for 100% in unrar, created by rarlab.com
The only extra thing we do is to run it under "nice", to lower the CPU priority of unrar.
Maybe we should add a "special" option to avoid the use of "nice",
so that you can experiment with that.

Re: Slower unrar on Nas than same drive

Posted: September 26th, 2012, 4:58 am
by .maxx
shypike wrote: Maybe we should add a "special" option to avoid the use of "nice",
so that you can experiment with that.
That would be great!

Re: Slower unrar on Nas than same drive

Posted: September 26th, 2012, 1:10 pm
by shypike
Forget what I said about the nice option.
If there are no "nice" parameters in Config->Switches, then nice isn't used.
So, it's just unrar itself that is slower in your situation.