Hiya,
In the first instance, laptop hard disks are generally slower than
desktop disks (7200rpm and laptops generally 5400rpm) although I
can't see that this should cause such a large difference!
What filesystem are the DVDs formatted to?
Cheers,
Luis.
On 21 Jan 2009, at 12:04, Tiemo Hollmann TB wrote:
Hello,
I have to copy about 7 GB in 6 zip files from DVD-ROM to HD.
I do it by a repeat loop with read - write - see below.
Because I experienced very big performance differences on different
machines, I made extensive tests on different machines and
different read
chunk sizes in the repeat loop.
First I experienced that the chunk size for reading has almost no
influence
on the total time. Tested with a chunkSize of 100K, 1MB, 10MB, 100MB.
But I experienced very big differences on different machines. Total
copying
time for 6,7 GB varies between 27min on a PC Desktop (Core 2,
2,66Ghz, 2GB),
49 min On a Vista Notebook (Core 2 Duo, 1,86 Ghz, 2GB) and 93min on a
MacBook (Core 2 Duo, 2,2 Ghz, 2GB), what meant a put through of 4,1
MB/s on
the PC and 1,2 MB/s on the Mac.
I am not the hardware or system guy, so can anybody shed some light
on these
differences. What is the bottleneck and is there anything I can do
in my
script, or do I have to tell my customers "Installation time can vary
between half an hour and two hours :-( ." and it is just like it is?
Thanks for any hint or experiences
Tiemo
The code snipped is:
open file tQuellFile for binary read
open file tZielFile for binary write
repeat until it is empty
read from file tQuellFile for gChunkSize #a global for testing
if it is not empty then
write it to file tZielFile
end if
add gChunkAdd to tMB
set the thumbpos of sb "Progress" to tMB
put tMB && "MB von gesamt ca." && gGesamtSize && "MB
kopiert..."
into fld "fldMB" # progress in MB
if the uCancel of this stack is true then
close file tQuellFile
close file tZielFile
answer "Abbruch"
exit to top
end if
wait 1 millisecs with messages # wait 0 didn't worked, no
click on a
button was accepted
end repeat
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