Do you know that current C++ Compiler limits to 64KB segments in source
code? It is good news that Microsoft Visual C++ 2005 has expanded to 4GB
segments in source code. 4GB segment is ideal for large object using
pointer to function and switch. Please list other C++ Compilers if they
have added a support of 4GB segments.
I am able to write 65,536 functions and 65,536 function's memory address
is stored into pointer to function list. It takes about 256KB. The test
has shown that each function out of 65,536 functions have been executed
successfully with correct result in both debug version and release version.
Switch can contain 65,536 cases in debug version, but C++ Compiler takes
more time to compile than pointer to function. Unfortunately, it will not
compile in release version. Unknown error is not found in any
documentation. (Not important to discuss this issue.)
I think that it is best practice to write small functions through
pointer to function list rather than large switch in one big function. By
the way, small functions can fit in cache. (Correct?).
If you are going to write 1 to 268,435,456 functions, memory address in
pointer to function list will take up to 1GB.
I know what you are going to say -- laugh -- can't be done. I urge you
to try if you are willing to write complex project. Think about holographic
character like Star Trek or character for game what you want to write. This
big object contains body including head, arm, leg, and everything. You need
to write hundred or thousand functions to respond moving arm, leg, and head.
More functions to be responded for mouth talking.
It makes 32-bit CPU machine to be slower to manipulate C++ Compiler for
large object so 64 bit CPU machine may be working with large RAM.
Please tell me what you think the best practice. Live with big object
by adding /bigobj and /Gy to Microsoft C++ Compiler. Check option
documentation for other C++ Compilers. Should write large pointer to
function list in more than 1 million line of source code? Or...Split half
or quarter function to pointer list into two or four module source code?
Please refer me to other newsgroups when I am interested to work large
object using optimization and performance using C++ Compiler's option, but
not through Microsoft alone. Please advise.
Bryan Parkoff
14  1957 
Bryan Parkoff wrote:
Do you know that current C++ Compiler
What's that? Where could I find "current C++ Compiler"? Are you
talking of the Standard requirements?
limits to 64KB segments in
source code?
No, I never heard of such thing. But then again, I cannot claim
I've heard everything... The Standard, however, imposes no such
limitation. I know that there are _minimal_ quantities *recommended*
for implementations , but I can't find "segments in source code" among
those.
It is good news that Microsoft Visual C++ 2005 has
Product-specific discussions are generally off-topic here. Each
product most likely has at least one dedicated newsgroup. I know
that VC++ certainly does, even more than one.
expanded to 4GB segments in source code. 4GB segment is ideal for
large object using pointer to function and switch. Please list other
C++ Compilers if they have added a support of 4GB segments.
Please list operating systems you want to learn about. Then please
realise that discussions specific to OS are also off-topic. There
are newsgroups for those things.
[..]
Please refer me to other newsgroups when I am interested to work
large object using optimization and performance using C++ Compiler's
option, but not through Microsoft alone. Please advise.
Try 'comp.os.ms-windows.program mer.*' hierarchy or 'microsoft.publ ic.*'
hierarchy.
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
Bryan Parkoff wrote:
Do you know that current C++ Compiler limits to 64KB segments in source
code? It is good news that Microsoft Visual C++ 2005 has expanded to 4GB
segments in source code. 4GB segment is ideal for large object using
pointer to function and switch. Please list other C++ Compilers if they
have added a support of 4GB segments.
phuff - gcc supports 9,223,372,036,8 54,775,807 byte segments.
Now I'm looking for a computer with that much memory, one that can write
to all of it in a few seconds.
Gianni Mariani <gi*******@mari ani.wswrote:
>Bryan Parkoff wrote:
> Do you know that current C++ Compiler limits to 64KB segments in source
code? It is good news that Microsoft Visual C++ 2005 has expanded to 4GB
segments in source code. 4GB segment is ideal for large object using
pointer to function and switch. Please list other C++ Compilers if they
have added a support of 4GB segments.
>phuff - gcc supports 9,223,372,036,8 54,775,807 byte segments.
How are you guys defining "segment"?
Steve
>> Do you know that current C++ Compiler limits to 64KB segments in
>>source
code? It is good news that Microsoft Visual C++ 2005 has expanded to
4GB
segments in source code. 4GB segment is ideal for large object using
pointer to function and switch. Please list other C++ Compilers if they
have added a support of 4GB segments.
>>phuff - gcc supports 9,223,372,036,8 54,775,807 byte segments.
How are you guys defining "segment"?
Steve,
Sorry. My mistake. I refer section (not segment). Look this article
below.
Microsoft Article:
By default, an object file can hold up to 65,536 (2^16) addressable
sections. /bigobj increases that address capacity to 4,294,967,296 (2^32).
Most modules will never generate an .obj file that contains more than 65,536
sections. However, machine generated code, or code that makes heavy use of
template libraries may require .obj files that can hold more sections.
An .obj file produced with /bigobj can only be consumed by a linker that
shipped in Visual C++ 2005 (or later). Linkers that shipped prior to Visual
C++ 2005 cannot read .obj files that were produced with /bigobj.
End of article
You know when you attempt to write 65,536 lines or greater on some C++
Compilers. It will fail to compile because of exceeded limit to 64KB
section. I think the point is that each object and source code are limited
to 64KB. Now, big object and big source code can handle 4GB section. It is
wonderful. It helps very much with pointer to function list.
Bryan Parkoff
"Gianni Mariani" <gi*******@mari ani.wswrote in message
news:45******** *************** @per-qv1-newsreader-01.iinet.net.au ...
Bryan Parkoff wrote:
> Do you know that current C++ Compiler limits to 64KB segments in
source code? It is good news that Microsoft Visual C++ 2005 has expanded
to 4GB segments in source code. 4GB segment is ideal for large object
using pointer to function and switch. Please list other C++ Compilers if
they have added a support of 4GB segments.
phuff - gcc supports 9,223,372,036,8 54,775,807 byte segments.
Now I'm looking for a computer with that much memory, one that can write
to all of it in a few seconds.
Well, it is going to be 8,388,608 TeraByte. What will you call if 8,388,608
is divided by 1,024 = 8192 "?"Byte. "?" reminds you to invent new name.
18,446,744,073, 709,551,616 is the maximum of 64 bit register.
(0x100000000000 00000 - 1)
Bryan Parkoff
Bryan Parkoff wrote:
.... What will you call if 8,388,608
is divided by 1,024 = 8192 "?"Byte. "?" reminds you to invent new name.
Kilo (2^10), Mega (2^20), Giga (2^30), Tera (2^40), Peta (2^50), Exa
(2^60), Zetta (2^70), Yotta (2^80)
Gianni Mariani wrote:
Bryan Parkoff wrote:
... What will you call if 8,388,608
>is divided by 1,024 = 8192 "?"Byte. "?" reminds you to invent new
name.
Kilo (2^10), Mega (2^20), Giga (2^30), Tera (2^40), Peta (2^50), Exa
(2^60), Zetta (2^70), Yotta (2^80)
http://en.wikipedia.org/wiki/Kibi
Bryan Parkoff wrote:
Microsoft Article:
By default, an object file can hold up to 65,536 (2^16) addressable
sections. /bigobj increases that address capacity to 4,294,967,296 (2^32).
(blahblah)
You know when you attempt to write 65,536 lines or greater on some C++
It will fail to compile because of exceeded limit to 64KB section.
The article talks about Microsoft compilers for Windows, not "some".
And there is no direct relation between the number of lines of the source
file and the limits of whatever structure in an object file (unless it
embeds the lines in such limited structure as part of debug information).
--
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