wyrd
Senior Contributor
String str = null;
I forget how much memory a pointer takes.. is it 2 bytes? And 1024 bytes per meg right?
I forget how much memory a pointer takes.. is it 2 bytes? And 1024 bytes per meg right?
Odd question about bytes per reference.
- Thread starter wyrd
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wyrd
Senior Contributor
Erk. *grabs heart in near heart attack* 4?! 
Holy smokes. I thought pointers just stored a 16 bit address... it's 32? That's crazy.
EDIT:
Err.. and speaking of which..
bits -> bytes -> kilobytes -> megs -> gigs
I think we were both wrong. Wouldn't it be 8 bits to a byte, 1024 bytes to a kilobyte, 1024 kilobytes to a meg and 1024 megs to a gig. So 1,048,576 bytes to a meg.
In which case what I was worried about doesn't matter. I was worried about a large array of reference types taking up a huge amount of memory. But perhaps not;
Assuming 4 bytes per reference, that's 524,288 references per meg (1048576 / 4). What I was previously thinking was 256 references per meg (1024 / 4). *blink*
I guess I was worrying for nothing.
Holy smokes. I thought pointers just stored a 16 bit address... it's 32? That's crazy.EDIT:
Err.. and speaking of which..
bits -> bytes -> kilobytes -> megs -> gigs
I think we were both wrong. Wouldn't it be 8 bits to a byte, 1024 bytes to a kilobyte, 1024 kilobytes to a meg and 1024 megs to a gig. So 1,048,576 bytes to a meg.
In which case what I was worried about doesn't matter. I was worried about a large array of reference types taking up a huge amount of memory. But perhaps not;
Assuming 4 bytes per reference, that's 524,288 references per meg (1048576 / 4). What I was previously thinking was 256 references per meg (1024 / 4). *blink*
I guess I was worrying for nothing.
Last edited:
Oops I dunno what I was thinking....
1024^1 bytes = 1 KB
1024^2 bytes = 1 MB
1024^3 bytes = 1 GB
etc...
Also, you could be right about the 16-bit pointers.. I just thought pointers were 32-bit. 65535 bytes available for pointers just doesn't seem reasonable.
1024^1 bytes = 1 KB
1024^2 bytes = 1 MB
1024^3 bytes = 1 GB
etc...
Also, you could be right about the 16-bit pointers.. I just thought pointers were 32-bit. 65535 bytes available for pointers just doesn't seem reasonable.
wyrd
Senior Contributor
Heh.. well I suppose this is what I get for not keeping the book I used in Assembly class. I'm sure someone will come along and set this whole thing straight.
PlausiblyDamp
Administrator
Pointers should be specific to the OS architecture. In a 32-bit version of windows a pointer needs to be able to address 4G of ram - therefore 32 bits long.
Hamburger1984
Centurion
...and the thing with storing a large amount of data in an array... why don't you use a MemoryStream - maybe it does what you're looking for?!
Andreas
Andreas
wyrd
Senior Contributor
PlausiblyDamp said:
Ah, that would explain it. Gah, now I remember why I thought they were 16 bits. In assembly class we built programs built off of the 16 bit architecture to make things easier.