Comments on: MPI in Thirty Minutes http://www.linux-mag.com/id/5759/ Open Source, Open Standards Fri, 10 Feb 2012 10:47:01 +0000 hourly 1 http://wordpress.org/?v=3.1 By: ????????? ??? ???????? ??????????? http://www.linux-mag.com/id/5759/#comment-45021 ????????? ??? ???????? ??????????? Fri, 18 Nov 2011 12:25:19 +0000 http://www.linux-mag.com/id/5759/#comment-45021 You can certainly see your expertise within the work you write. The world hopes for more passionate writers like you who are not afraid to mention how they believe. Always go after your heart. You can certainly see your expertise within the work you write. The world hopes for more passionate writers like you who are not afraid to mention how they believe. Always go after your heart.

]]> By: ryprice00 http://www.linux-mag.com/id/5759/#comment-9086 ryprice00 Sun, 06 Mar 2011 02:46:22 +0000 http://www.linux-mag.com/id/5759/#comment-9086 Great article! Thanks a million. Great article!

Thanks a million.

]]> By: joe landman http://www.linux-mag.com/id/5759/#comment-5288 joe landman Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/5759/#comment-5288 Quick note: the source can be downloaded from the above link, or from here http://downloads.scalableinformatics.com/downloads/linux-magazine/ <br /> ... I mention this, as the OpenMP code link looks to be broken. I'll let the editors know.<br /> <br /> Also, there are a number of errors in this document (some formatting, some conversion). The vector bit is supposed to be <br /> <br /> [ 1^(-2), 2^(-2), ... ]<br /> <br /> or for the Fortran users among us<br /> <br /> [ 1**(-2), 2**(-2), ...]<br /> <br /> The idea is that we form a vector of integers from 1 to the "infinity" value, square each element, then invert each element. This will give us a vector that looks like<br /> <br /> [ 1, 1/4, 1/9, 1/16, .... ]<br /> <br /> Then you can either sum these up, or notice that the definition of a dot product lets you do this as well<br /> <br /> [ 1, 1/4, 1/9, 1/16, ...] dot [ 1, 1, 1, 1, ... ] = pi*pi/6<br /> <br /> which was what I was trying to explain. Once the formatting fell off, the rest didn't make much sense.<br /> <br /> My apologies on this. Quick note: the source can be downloaded from the above link, or from here http://downloads.scalableinformatics.com/downloads/linux-magazine/
… I mention this, as the OpenMP code link looks to be broken. I’ll let the editors know.

Also, there are a number of errors in this document (some formatting, some conversion). The vector bit is supposed to be

[ 1^(-2), 2^(-2), ... ]

or for the Fortran users among us

[ 1**(-2), 2**(-2), ...]

The idea is that we form a vector of integers from 1 to the “infinity” value, square each element, then invert each element. This will give us a vector that looks like

[ 1, 1/4, 1/9, 1/16, .... ]

Then you can either sum these up, or notice that the definition of a dot product lets you do this as well

[ 1, 1/4, 1/9, 1/16, ...] dot [ 1, 1, 1, 1, ... ] = pi*pi/6

which was what I was trying to explain. Once the formatting fell off, the rest didn’t make much sense.

My apologies on this.

]]> By: drrossef http://www.linux-mag.com/id/5759/#comment-5289 drrossef Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/5759/#comment-5289 Nice intro - thanks Nice intro – thanks

]]> By: dave_lantos http://www.linux-mag.com/id/5759/#comment-5290 dave_lantos Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/5759/#comment-5290 What an informative, easy to follow, well written article. Thanks for the excellent work, Joe! What an informative, easy to follow, well written article. Thanks for the excellent work, Joe!

]]> By: zayar43 http://www.linux-mag.com/id/5759/#comment-5291 zayar43 Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/5759/#comment-5291 Great!!! Thanks!!! Great!!! Thanks!!!

]]> By: bejosukamto http://www.linux-mag.com/id/5759/#comment-5292 bejosukamto Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/5759/#comment-5292 Execuse Me....Anybody can help me, how to measure execution time for an elementary operations like addition, multiplication for processor AMD-Duron 800MHz, is't different with FLOPS? what the different way for FLOPS? thanks Execuse Me….Anybody can help me, how to measure execution time for an elementary operations like addition, multiplication for processor AMD-Duron 800MHz, is’t different with FLOPS? what the different way for FLOPS? thanks

]]> By: hashimi http://www.linux-mag.com/id/5759/#comment-5293 hashimi Tue, 30 Nov 1999 00:00:00 +0000 http://www.linux-mag.com/id/5759/#comment-5293 <p>Dear Sir/Madam<br /> i hope this message reaches to you while your in the best health</p> <p>Dear i was trying to configure the GMP in Ubuntu 8.04,but actually i followed the same steps from the above article:</p> <p> cd ~<br /> wget http://ftp.sunet.se/pub/gnu/gmp/gmp-4.2.2.tar.bz2<br /> cd workspace<br /> tar -xjvf /home/joe/gmp-4.2.2.tar.bz2<br /> cd gmp-4.2.2/<br /> ./configure 0x2013prefix=/home/joe/local</p> <p>after that i got these errors:</p> <p>ibrahim@ibrahim-laptop:~/nsaproject/gmp-4.2.2$ ./configure 0x2013prefix=/home/ibrahim/local<br /> ./configure: line 816: 0x2013prefix=/home/ibrahim/local: No such file or directory<br /> ./configure: line 817: export: `0x2013prefix\': not a valid identifier<br /> checking build system type... i686-pc-linux-gnulibc1<br /> checking host system type... i686-pc-linux-gnulibc1<br /> checking for a BSD-compatible install... /usr/bin/install -c<br /> checking whether build environment is sane... yes<br /> checking for gawk... no<br /> checking for mawk... mawk<br /> checking whether make sets $(MAKE)... yes<br /> checking whether to enable maintainer-specific portions of Makefiles... no<br /> checking ABI=32<br /> checking compiler gcc -m32 -O2 -fomit-frame-pointer ... no<br /> checking compiler gcc -O2 -fomit-frame-pointer ... no<br /> checking compiler icc -no-gcc ... no<br /> checking whether cc is gcc... yes<br /> checking compiler cc -m32 -O2 -fomit-frame-pointer ... no<br /> checking compiler cc -O2 -fomit-frame-pointer ... no<br /> configure: error: could not find a working compiler, see config.log for details</p> <p>can you please help us to configure this in Ubuntu 8.04</p> <p>Thank You;</p> <p>Hashimi </p> Dear Sir/Madam
i hope this message reaches to you while your in the best health

Dear i was trying to configure the GMP in Ubuntu 8.04,but actually i followed the same steps from the above article:

cd ~
wget http://ftp.sunet.se/pub/gnu/gmp/gmp-4.2.2.tar.bz2
cd workspace
tar -xjvf /home/joe/gmp-4.2.2.tar.bz2
cd gmp-4.2.2/
./configure 0x2013prefix=/home/joe/local

after that i got these errors:

ibrahim@ibrahim-laptop:~/nsaproject/gmp-4.2.2$ ./configure 0x2013prefix=/home/ibrahim/local
./configure: line 816: 0x2013prefix=/home/ibrahim/local: No such file or directory
./configure: line 817: export: `0x2013prefix\’: not a valid identifier
checking build system type… i686-pc-linux-gnulibc1
checking host system type… i686-pc-linux-gnulibc1
checking for a BSD-compatible install… /usr/bin/install -c
checking whether build environment is sane… yes
checking for gawk… no
checking for mawk… mawk
checking whether make sets $(MAKE)… yes
checking whether to enable maintainer-specific portions of Makefiles… no
checking ABI=32
checking compiler gcc -m32 -O2 -fomit-frame-pointer … no
checking compiler gcc -O2 -fomit-frame-pointer … no
checking compiler icc -no-gcc … no
checking whether cc is gcc… yes
checking compiler cc -m32 -O2 -fomit-frame-pointer … no
checking compiler cc -O2 -fomit-frame-pointer … no
configure: error: could not find a working compiler, see config.log for details

can you please help us to configure this in Ubuntu 8.04

Thank You;

Hashimi

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