Re: Switching to 64 bit
On 06/29/2013 02:05 AM, Stan Hoeppner wrote:
On 6/28/2013 2:49 PM, Frank McCormick wrote:
For now I will run regular 32-bit Sid..realizing I am wasting
the opportunity to utilize more memory and perhaps faster operations.
Your 32 bit PAE Sid kernel can address 64GB. Since your new machine
will have less than 64GB RAM you're wasting no opportunity. Your only
limitation is 2GB per process. How many of your apps consume more than
2GB of RAM?
None that I am aware of
WRT speed, the vast majority of 32 bit integer programs will execute
slightly faster than their 64 bit counterparts due to more efficient
cache use--32 bit instructions consume less memory space than 64 bit
instructions, thus more instructions fit in L1/2/3 caches. This,
combined with plenty of rename registers, offsets the advantage of the
extra 8 architectural registers available in long mode.
More good news for me for now anyway.
And now the kicker. None of the above means squat if you bought a
modern fast CPU with plenty of cache. There will be no perceptible
difference between 32/64 bit OS platforms running the standard fare of
desktop applications.
Can't ask for more. But undoubtedly I will eventually go to a full
64-bit installation.
Thanks Stan, a clear and easily understood explanation of the
differences.
--
Cheers
Frank
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