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Wednesday, October 20, 2010. Unintended std: vector blues. Sometimes has rather obscure semantics. For example, when you're writing generic code with MPI and you use vector to store some local data that needs to be sent/received by another processor, the usual trick of retrieving the beginning address of the internal array by &my vector[0]. Will fail miserably when T=bool. This post is about another obscurity. Namely the reserve(). Vector T v, w;. For(int i=0; i n; i) v[i] = (T) i;. Now, guess what?

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aydozz's technical | aydozz-tech.blogspot.com Reviews

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Wednesday, October 20, 2010. Unintended std: vector blues. Sometimes has rather obscure semantics. For example, when you're writing generic code with MPI and you use vector to store some local data that needs to be sent/received by another processor, the usual trick of retrieving the beginning address of the internal array by &my vector[0]. Will fail miserably when T=bool. This post is about another obscurity. Namely the reserve(). Vector T v, w;. For(int i=0; i n; i) v[i] = (T) i;. Now, guess what?

<META> KEYWORDS

1 std vector

2 vreserve n ;

3 wswap v ;

4 posted by

5 aydozz

6 no comments

7 intrusive data structures

8 template typename obj

9 struct listnode

10 obj object;

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std vector,vreserve n ;,wswap v ;,posted by,aydozz,no comments,intrusive data structures,template typename obj,struct listnode,obj object;,struct object,inside main cpp,template unsigned tt,template,inside side cpp,debugging mpi,void *base;,mpid win;

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aydozz's technical | aydozz-tech.blogspot.com Reviews

https://aydozz-tech.blogspot.com

Wednesday, October 20, 2010. Unintended std: vector blues. Sometimes has rather obscure semantics. For example, when you're writing generic code with MPI and you use vector to store some local data that needs to be sent/received by another processor, the usual trick of retrieving the beginning address of the internal array by &my vector[0]. Will fail miserably when T=bool. This post is about another obscurity. Namely the reserve(). Vector T v, w;. For(int i=0; i n; i) v[i] = (T) i;. Now, guess what?

INTERNAL PAGES

aydozz-tech.blogspot.com

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aydozz's technical: July 2009

http://aydozz-tech.blogspot.com/2009_07_01_archive.html

Wednesday, July 29, 2009. Initialization has been a vague part of my C knowledge. Although I always knew that most user defined classes has appropriate constructors, so that I can expect reasonable behavior (e.g. std: string initializes to an empty string " ), this hasn't been the case for built-in arrays of vectors. What do you expect from this code:. Float * test = new float[10];. Copy(test, test 10, ostream iterator float ( cout, " ");. Here is the loophole. Float * test = new float[10] () ;. Copy(tes...

2

aydozz's technical: August 2010

http://aydozz-tech.blogspot.com/2010_08_01_archive.html

Monday, August 30, 2010. Template specialization is explicit instantiation. Fact: As the title says, whenever you specialize a templated function, you explicitly instantiate it as well. What's the practical implication? You can just compile the specialization separately and link it to the main program. This property was invaluable in my case where I wanted to use different compilers for different parts of my code (hence I can not just include every template function). How do you do it? Lots of code */ }.

3

aydozz's technical: September 2008

http://aydozz-tech.blogspot.com/2008_09_01_archive.html

Friday, September 26, 2008. How to get rid of dot/slash when running executables on Linux. And why you shouldn't be doing this unless it is absolutely necessary. But anyway, sometimes there is this old/legacy program that tries to execute another program inside the same directory without the dot/slash, and we don't have access to its source code or we don't wanna access its source code (for reasons apparent to a CS person). Here: http:/ www.linfo.org/dot slash.html. Subscribe to: Posts (Atom).

4

aydozz's technical: December 2009

http://aydozz-tech.blogspot.com/2009_12_01_archive.html

Wednesday, December 30, 2009. Parallel debugging has come a long way. Today, it's quite possible to use -X and remotely debug a parallel MPI application running on a supercomputer. TotalView and DDT are just two example debuggers, their IDEs are pretty familiar for a seasoned C/C programmer. In file mpi.h. Typedef int MPI Win;. In file mpiimpl.h. Typedef struct MPID Win {. Int handle; /* value of MPI Win for this structure */. Volatile int ref count;. MPI Aint size;. MPID Attribute *attributes;. Bool ope...

5

aydozz's technical: C++ Performance for HPC, part #1

http://aydozz-tech.blogspot.com/2009/06/c-performance-for-hpc-part-1.html

Friday, July 24, 2009. C Performance for HPC, part #1. I deliberately chose this controversial title as it is one of the most debated issues. I also avoided saying C/C as no such language exists. C is C, and C is C . I hate the famous "do one simple run, measure it, draw far-reaching conclusions from that simple experiment" cycle. Cache sizes, replacement policy, compiler, etc. Here is my test:. Firsts = new double[size];. Seconds = new double[size];. Thirds = new double[size];. Double * firsts;. Printf(...

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aydozz-tech.blogspot.com

aydozz's technical

Wednesday, October 20, 2010. Unintended std: vector blues. Sometimes has rather obscure semantics. For example, when you're writing generic code with MPI and you use vector to store some local data that needs to be sent/received by another processor, the usual trick of retrieving the beginning address of the internal array by &my vector[0]. Will fail miserably when T=bool. This post is about another obscurity. Namely the reserve(). Vector T v, w;. For(int i=0; i n; i) v[i] = (T) i;. Now, guess what?

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