Re: 32-bit programs on Windows x64


"Joseph M. Newcomer" <newcomer@xxxxxxxxxxxx> wrote in
message news:ntvq64djji32o6smjpgqj7soo397b09ilk@xxxxxxxxxx
There is no way to discover this. There are so many
processes running that if you really
need 4GB of physical memory available to hold your entire
process, you will need at least
an 8GB machine, AND EVEN THEN THERE IS NO GUARANTEE THAT
PAGING WILL NOT OCCUR. It is
essentially not under your control. You can try
::VirtualLock, but it doesn't guarantee
that you can lock things down (and you need special admin
configuration parameters to
allow it to work at all, and you have to set your working
set quota).

Any belief that Windows can sustain real-time behavior is
based on various delusional
systems. It is not real-time and any illusion that it is
real-time is just that, an
illusion.

A swapping operation takes 10-50ms depending on a variety
of parameters. But it is
impossible to process 4.2GB of data in 1/10 of a second
using ANY algorithm, even if there
is nothing going on. Therefore the only thing that
matters is the actual working set.

My system requires 4 GB to store its DFA pixel pattern
recognizer. To match any particular pixel pattern only
requires traversing a tiny subset of this 4 GB of data. The
4 GB of data is required so that millions of different pixel
patterns can be concurrently matched.
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7046848.PN.&OS=PN/7046848&RS=PN/7046848


Perhaps you really have an infeasible project.
joe


On Thu, 3 Jul 2008 14:03:01 -0700 (PDT), PeteOlcott
<PeteOlcott@xxxxxxxxx> wrote:

What part of "virtual memory is not physical memory" are
you missing. I've said this
eight or ten or a dozen times, VIRTUAL MEMORY IS NOT
PHYSICAL MEMORY.

Not only does my process require 4.0 GB of RAM, it is also
time
critical. If there is any swapping to and from VM, then
the current
project becomes infeasible. I must know how much actual
RAM is
available to my process, even though this actual RAM will
be mapped to
VM. If three is any swapping to and from disk, the current
project
becomes infeasible, my maximum response time is 1/10
second.
Joseph M. Newcomer [MVP]
email: newcomer@xxxxxxxxxxxx
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm


.

Relevant Pages

  • Re: 32-bit programs on Windows x64
    ... processes running that if you really ... need 4GB of physical memory available to hold your entire ... My system requires 4 GB to store its DFA pixel pattern ... Not only does my process require 4.0 GB of RAM, ...
    (microsoft.public.vc.mfc)
  • Re: 32-bit programs on Windows x64
    ... Any belief that Windows can sustain real-time behavior is based on various delusional ... A swapping operation takes 10-50ms depending on a variety of parameters. ... eight or ten or a dozen times, VIRTUAL MEMORY IS NOT PHYSICAL MEMORY. ... Not only does my process require 4.0 GB of RAM, ...
    (microsoft.public.vc.mfc)
  • Re: 32-bit programs on Windows x64
    ... The result is the loop takes 271 seconds, which is a lot longer than 100ms. ... have a requirement to respond in 100ms, worrying about physical memory is among the least ... Not only does my process require 4.0 GB of RAM, ... If three is any swapping to and from disk, ...
    (microsoft.public.vc.mfc)
  • Re: 32-bit programs on Windows x64
    ... eight or ten or a dozen times, VIRTUAL MEMORY IS NOT PHYSICAL MEMORY. ... Not only does my process require 4.0 GB of RAM, ... If three is any swapping to and from disk, ...
    (microsoft.public.vc.mfc)
  • Re: 32-bit programs on Windows x64
    ... My system requires 4 GB to store its DFA pixel pattern ... THE AMOUNT OF RAM ON THE MACHINE IS COMPLETELY, TOTALLY UNRELATED TO THE AVAILABLE ADDRESS ... on thinking about physical memory as being an operational parameter in any of this? ... Note that the L2 cache is ...
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