[Ubuntu-be] CopyKitten Benchmarks

[Wouter Vandenneucker]

Claudio, would it be possible to give me the latest ISO? Or is it online
somewhere?

Grts


Wouter

2012/9/28 Claudio Mammarella <claudio.mammarella op telenet.be>

>  Hey wouter ,
>
> When i use DD i'm copying from a disk or an image file of the same size as
> the target drive.
> So the drive or image has to be the exact same size, then there is no
> "unallocated memory"
>
> I don't think that we can write 4gb under 3 minutes with our usb-drives
> (class4)
> Class 4 means min. 4MB/s and it will take about 15 to 20 minutes to write
> a single usb-drive (4gb).
> You wrote from 2,5 to 5 minutes for 700mb, (4000MB:700MB)x4min=22 min/drive
>
> grts
> Claudio
>
> Op 28-09-12 13:31, Wouter Vandenneucker schreef:
>
> Hi all
>
>  So I'm messing around a bit with CopyKitten. Turns out: there are some
> glitches in the code..
> For some reason today the usb drives where written 1 by 1. I'll be fixing
> that later today on the train.
>
>  *Benchmarking*
> *
> *
> This did allow me to do some benchmarking automated (I could get 3 sticks
> to write and log the time without having to sit behind my computer).
> Writing an ISO from one USB drive to the others takes an aweful amount of
> time because it goes through the total 4GBs of memory even when only 700MB
> is written.
> Using an ISO file goes a lot faster.
>
>  *Unallocated memory*
> *
> *
> When I tried to use the normal Ubuntu 12.04 ISO it resulted in a bootable
> 700MB partition and 3.3GB of unallocated memory.
> I'm going to experiment with 2 partitions on the USB drive, because I
> believe that allocating that memory is faster than writing "empty space" to
> the drive using ddrescue.
>
>  I let the program write 3 USB drives the times needed to do that are
> roughly: 5 minutes, 2.5 minutes, 3 minutes. Way less than writing from USB
> to USB.
> However, you should note that those times are for 700MB ubuntu bootable
> and 3.3GB unallocated.
>
>  Claudio, how do you solve this "unallocated memory"?
>
>  *Blocksize*
> *
> *
> One of the other "optimizations" I made is changing the default block-size
> at which ddrescue writes to the usb drives. It turns out that 5MB goes
> well, and depending on the harddrive you could crank that up. I'll be
> testing some drives here but I am wondering how fast we could get using an
> SSD with optimized blocksize.
>
>  (if we can write 4GB in less than 3 minutes we don't need to worry about
> allocating memory)
>
>  *Future steps*
> *
> *
>
>    - For now I'm going to change to code to write all drives at once
>    - Optimze the blocksize even further
>    - Get rid of a bug that you encounter when you use an ISO instead of a
>    master drive
>
>
>  Grts
>
>
>  Wouter
>
>
>
>
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