[mdlug] Moving to Debian 64bit - Lessons Learned?

[Dan Pritts]

On Mon, Aug 03, 2009 at 01:27:29PM -0700, Michael S. Mikowski wrote:
> There may be usage scenarios where the large memory patch does not work well, 
> and as I indicated in my prior post, I didn't dig any further into the issue 
> because for our usage pattern, the large memory kernel appeared to work just 
> fine. 
> 
> > > Exactly how that memory was accessed (e.g. if it were "paged" or not) I
> > > never investigated since MySQL ran like a top.

One particular issue that some will run into is maximum process memory
size.  Clearly for your usage it was OK but in other cases it won't be.

> I figured there was some paging or bank-switching going on like with the old  
> 128KB 8-bit systems of yore (Atari 128XL or similar comes to mind). 

or expanded memory in DOS.

> Still, I would tend towards the 32-bit with the large memory patch first to see 
> if it worked well for my usage.  If it did not, I would then move to 64 bit.

Depends on your workload, but for e.g. general desktop usage I tend to agree.

danno
--
dan pritts
danno at umich.edu
734-929-9770