Is it easy/possible to run code with 32 bit pointers on a modern 64 bit OS?

[Gary E. Miller]

Yo Hal!

On Sun, 26 Mar 2017 17:53:18 -0700
Hal Murray <hmurray at megapathdsl.net> wrote:

> gem at rellim.com said:
> > I don't see how 32/64 bit has any effect on the size of a list.  At
> > least if the list is tightly specified.  uint32 as opposed to
> > uint.  Maybe if you pack the structure, or encode things tighter
> > you might make some headway.   
> 
> It's the pointers in each list member.  If nothing else, a list
> member will have a pointer to the next member.  The MRU list has
> next, previous, and next-hash-chain pointers.

Ouch, I'd try to fix that.   Maybe a different list layout model?

Given the churn in the MRU list it may be a linked list is best.  But
worth a look.

If you used gentoo then going 32 bit would be easy.  I don't know how
to do it on other distros.

> The MRU slot is 88 bytes with 64 byte pointers and 72 bytes with 32 bit 
> pointers.  (So there is a 4th pointer somewhere.)

Or a structure packing issue.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588

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    "If you can’t measure it, you can’t improve it." - Lord Kelvin
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