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Parallel file system
By Posted 05/21/20080
A file system that is visible to any processor in the system and can be read and written by multiple units of execution (UEs) simultaneously. Although a parallel file system appears to the computer system as a single file system, it is physically distributed among a number of disks. To be effec...
OR parallelism
By Posted 05/21/20080
An execution technique in parallel logic languages in which multiple clauses may be evaluated in parallel. For example, consider a problem with two clauses A: B,C and A: E,F. (read “A follows from B and C” and “A follows from E and F”) which means that goal A succeeds if and only if both subgoa...
Multiprocessor
By Posted 05/21/20080
A parallel computer with multiple processors that share an address space. (See also multi-core.)
Multicomputer
By Posted 05/21/20080
A parallel computer based on a distributed-memory, MIMD parallel architecture. The system appears to the user as a single computer.
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Is DOS the ideal parallel environment - Part I
By Asaf Shelly Posted on 08/25/08 8
Previous article described the evolution of computer languages from early days Assembly to Object Oriented languages favored today. The emphasis was that early languages had clear execution flow that could be abused into "spaghetti code" (so many jumps / GoTos in the code that it becomes unmanage...
The latest Xeon and OpenSolaris - in 5 minutes
By David Stewart (Intel) Posted on 08/23/08 4
In my most recent 5-minute OpenSolaris video, the cats are out of the bag, the gloves are off, and the latest Xeon is on its way. Codenamed "Dunnington", it will actually appear as the "Xeon 7400 Series" processor. (Sorry, we shot this before the name would be known for sure). Enjoy! As alway...
Flaws of Object Oriented Modeling
By Asaf Shelly Posted on 08/22/08 28
At the beginning of the computer era the system designers came from the world of hardware and it is noticeable. In hardware there are many working elements that can operate in parallel and most times at different rates of operation. This requires hi degree of accuracy in system timing. Chip desig...
Intel® Summary Statistics Library: how to process data in chunks?
By Dmitry Kabaev (Intel) Posted on 08/22/08 4
In my previous post I considered computation of statistical estimates for in-memory datasets using tools available in Intel® Summary Statistics Library. New days bring new problems, and today I need to compute the same estimates for data which can not fit into memory of a computer. To process the...
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Poor threading performance on Intel Xeon E5-2680 v2
By Pascal10
Hello I am running a visualization program (visualizing a large dataset) where I can either use MPI or pthreads. When I run it on my desktop which has an Intel i7-2600K (4 cores, 8 threads), I get better performance using pThreads (I'm using a lot of threads, e.g 32) compared to using MPI which is normal (I guess). But when I run the same code on one node (which is part of a cluster) which has Intels Xeon E5-2680 v2 (10 cores, 20 threads), the performance I get using pthreads is worse than MPI; about 70s while using MPI compared to 180s using pthreads. Even worse, the performance on the Intel Xeon E5-2680 v2 is lower than on that of the Intel i7-2600K, it's around 100s on the 2600k but 180 on the  E5-2680 (same number of threads on both). I check using the top command and all the cores are active when I run the program.   So my question is why is that happening? Is there some other way I should be compiling the code on the E5-2680? Is there some variables I should set like KMP_AFFIN...
HTM/STM and Scheduling
By Simone A.1
Hi, I have a question about Hardware and Software Transactional Memory. Given the types of versioning (eager and lazy) and conflict detection (optimistic and pessimistic) and let's say that 2 or more threads are performing a transaction that write/read the same memory location. The scheduling of the threads could affect the ability of detect a conflict? Which combination of versioning and conflict detection would be better to always catch the conflicts? Hope my question is clear. Thanks. Best Regards, Simone
Locking CPU cache lines for a thread ( L1)
By Younis A.14
Hi I'm working on securing access to L1 cache by locking it line by line. Is there any way to do it? For example, two threads accessing the L1 and L1 lines are locked for a certain time to each thread accessed them. Regards, Younis
Responsive OpenMP Theads in Hybrid Parallel Environment
By Don K.1
I have a Fortran code that runs both MPI and OpenMP.  I have done some profiling of the code on an 8 core windows laptop varying the number of mpi  tasks vs. openmp threads and have some understanding of where some performance bottlenecks for each parallel method might surface.  The problem I am having is when I port over to a Linux cluster with several 8-core nodes.  Specifically, my openmp thread parallelism performance is very poor.  Running 8 mpi tasks per node is significantly faster than 8 openmp threads per node (1 mpi task), but even 2 omp threads + 4 mpi tasks runs was running very slowly, more so than I could solely attribute to a thread starvation issue.  I saw a few related posts in this area and am hoping for further insight and recommendations in to this issue.  What I have tried so far ... 1.  setenv OMP_WAIT_POLICY active      ## seems to make sense 2.  setenv KMP_BLOCKTIME 1          ## this is counter to what I have read but when I set this to a large number (2500...
Optimizing cilk with ternary conditional
By Fabio G.3
What is the best way to optimize the cycle cilk_for(i=0;i<n;i++){ x[i]=x[i]<0?0:x[i]; }or somethings like that? Thanks, Fabio
have asked them to
By Robert P.0
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Optimizing reduce_by_key implementation using TBB
By Shruti R.0
Hello Everyone, I'm quite new to TBB & have been trying to optimize reduce_by_key implementation using TBB constructs. However serial STL code is always outperforming the TBB code! It would be helpful if I'm given an idea about how reduce_by_key can be improvised using tbb::parallel_scan. Any help at the earliest would be much appreciated. Thanks.
reading a shared variable
By VIKRANT G.4
hello everyone I am relatively new to parallel programming and have the following doubt:- is reading a shared variable(that is not modified by any thread) without using locks a good practice thanks for the help in advance  
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