Hi,
We are talking about a Disk Address not a RAM address. I just want to
read a small amount of data (say 100 bytes) from *anywhere* in a
file. For instance:
read from file "myFile" at 2147483647 for 100 works, but
read from file "myFile" at 2147483648 for 100 doesn't!
(I haven't test this but I am assuming that this won't work. I can't
test it today because I don't have access to the files).
To work stuff like this out, I usually go back to basics:
constant KILO=1024
constant MEGA=KILO * KILO
constant GIGA=MEGA * MEGA
32 Bits is 4 * GIGA which Unsigned allows numbers between 0 and
4,294,967,295 and signed allows number between -2147483648 and +
2147483647.
The capacity of 16 Bits is 65536
The capacity of 32 Bits is 4,294,967,296 (65536 * 65536)
The capacity of 64 Bits is 18,446,744,073,709,600,000 (4,294,967,296
* 4,294,967,296)
So the number of Gigabytes in 64 Bits is (4,294,967,296 *
4,294,967,296) / GIGA
All the Best
Dave
On 17 May 2007, at 19:44, J. Landman Gay wrote:
Dave wrote:
Hi,
That's what I'm doing, but it's *way* too slow and crashes if you
read too much data. I've got a 60+ GB file and need to read at
"random" positions in the file. Moving from somewhere near the
start to somewhere near the end takes minutes! The ironic thing is
that the data I want to read when I get there is quite small!
There is a limit to the total addressable RAM space that Rev can
use. It's 4 gigs on 32-bit systems, and 16P on 64-bit systems. I
believe that Rev works with 64-bit systems (for two reasons: they
said it would, and it is documented) so it may be that you are
reaching one of the limits. However, my brain cannot process how
large 16P is so I'm not sure. What's that in gigs?
--
Jacqueline Landman Gay | [EMAIL PROTECTED]
HyperActive Software | http://www.hyperactivesw.com
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