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Marco Segurini

1 Jul 2003 1 Jul '03

3:25 p.m.

Hi, I am very new in using Boost library. I start replacing row memory array with 'multi_array' class template but the performace slow down a lot. Running this test program... //begin------------------ #include "windows.h" #include <iostream> #include "boost\multi_array.hpp" using namespace std; using namespace boost; int main() { const size_t DimX = 2000; const size_t DimY = 1500; const size_t DimZ = 1; multi_array V3(extents[DimZ][DimY][DimX]); int iVal; unsigned long time1 = GetTickCount(); for (size_t Z=0; Z

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Darren Cook

2 Jul 2 Jul

7:50 a.m.

New subject: [Boost-Users] multi_array performance

... the output (using vc++ in release mode with no optimization) is

Multi_array: 1663 Pointer....:70

I've nothing helpful to say about multi_array, but how do the timings compare when you use the maximum speed optimizations? Much STL/Boost code is written on the assumption that lots of things will be optimized away. Darren

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Marco Segurini

1:08 p.m.

"Darren Cook" ha scritto nel messaggio news:3F028EC9.8020208@dcook.org...

...
... the output (using vc++ in release mode with no optimization) is

Multi_array: 1663 Pointer....:70

I've nothing helpful to say about multi_array, but how do the timings compare when you use the maximum speed optimizations? Much STL/Boost code is written on the assumption that lots of things will be optimized away.

Darren

I make a test setting vc++ 7.1 with "Maximize Speed /O2" optimization with these results: Multi_array: 471 Pointer....:0 so the difference persists. Marco.

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Beman Dawes

3:53 p.m.

New subject: [Boost-Users] Re: multi_array performance

At 09:08 AM 7/2/2003, Marco Segurini wrote:

"Darren Cook" ha scritto nel messaggio news:3F028EC9.8020208@dcook.org...

...
...
... the output (using vc++ in release mode with no optimization) is

Multi_array: 1663 Pointer....:70

I've nothing helpful to say about multi_array, but how do the timings compare when you use the maximum speed optimizations? Much STL/Boost code is written on the assumption that lots of things will be optimized away.

Darren

I make a test setting vc++ 7.1 with "Maximize Speed /O2" optimization with these results:

Multi_array: 471 Pointer....:0

so the difference persists.

That seems beyond what might be expected from an abstraction penalty. Have you looked at the code being generated to see where the added time is coming from? --Beman

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Alexis Gatt

5:07 p.m.

New subject: Serialization

Hello all, I am looking for a "good" serialization library for C++. While looking at the files in the yahoo repository, I found the Serialization6.zip, which basically contains a draft for a boost::serialization library. And my question is: Has anyone tried it? Is it good? On the same topic, does anyone know a serialization library worth recommending? Thanks a lot Alexis --------------------------------- Want to chat instantly with your online friends? Get the FREE Yahoo!Messenger [Non-text portions of this message have been removed]

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Jonathan de Halleux

3 Jul 3 Jul

9:19 a.m.

New subject: [Boost-Users] Serialization

What do you mean exactly by serialization library ? You have a look at http://iobind.sourceforge.net (of course i'm developping it :) At 18:07 2/07/2003 +0100, you wrote:

Hello all,

I am looking for a "good" serialization library for C++. While looking at the files in the yahoo repository, I found the Serialization6.zip, which basically contains a draft for a boost::serialization library. And my question is: Has anyone tried it? Is it good?

On the same topic, does anyone know a serialization library worth recommending?

Thanks a lot

Alexis

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Alexandre Carsac

7 Jul 7 Jul

8:07 a.m.

New subject: [Boost-Users] Serialization

If u look for serialisation API, it could be for 2 main reasons : - Tramsmit object accross network - Save it to make it persistant. Perhaps take a look at ice http://zeroc.com . This is simpler than corba and said to be already utilised successfully in massively parallel games. Alexis Gatt wrote: Hello all, I am looking for a "good" serialization library for C++. While looking at the files in the yahoo repository, I found the Serialization6.zip, which basically contains a draft for a boost::serialization library. And my question is: Has anyone tried it? Is it good? On the same topic, does anyone know a serialization library worth recommending? Thanks a lot Alexis --------------------------------- Want to chat instantly with your online friends? Get the FREE Yahoo!Messenger [Non-text portions of this message have been removed] Yahoo! Groups SponsorADVERTISEMENT Info: http://www.boost.org Wiki: http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl Unsubscribe: mailto:boost-users-unsubscribe@yahoogroups.com Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. --------------------------------- Do You Yahoo!? -- Une adresse @yahoo.fr gratuite et en français ! Testez le nouveau Yahoo! Mail [Non-text portions of this message have been removed]

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participants (6)

Alexandre Carsac
Alexis Gatt
Beman Dawes
Darren Cook
Jonathan de Halleux
Marco Segurini