AW: what is the bottleneck when copying file from CD?

[Luis]

Hiya,

We're all learning!

Cheers,

Luis.




On 23 Jan 2009, at 08:25, Tiemo Hollmann TB wrote:

> Just to give you a feedback of my further tests.
>
> 1. The main performance difference is between Notebooks (average:  
> 2,4MB/s)
> and Desktops (average: 4,2MB/s), because of HW differences.
> 2. The very slow performance of the MacBook was because of a CD  
> burned on
> Win. When burning the same datas on the Mac, the performance was  
> almost
> exact the same between a comparable Win Notbook and MacBook
> 3. The chunk size for read/write has between 4096 bytes and 10MB  
> almost no
> significant performance difference. Lower than 4096 bytes the  
> performance
> decreased dramatically, with a chunk size of 512 bytes I had only  
> 0,4MB/s.
> Probably because her the performance part of my repeat loop comes into
> account.
>
> My conclusion is, I'll go with a chunk size of 4096 bytes and will  
> tell my
> customers, that the installation of my 7GB will take between 30 and  
> 90 min,
> depending on the performance of their machines. (I even had a  
> betatester,
> where it took 140min on a 3 year old Win Notebook, but I hope it is  
> a single
> outlier)
>
> Thanks Luis and Florian to point me to the right direction.
> Tiemo
>
>