Challenge
Develop a methodology for the tuning phase of the development cycle. The tuning phase increases performance incrementally where possible.
OpenMP*
Resolve Memory Conflicts in Data-Decomposition Problems
Challenge
Identify memory conflicts in a data-decomposition problem to identify data-restructuring requirements. This procedure is part of the design phase for threaded applications that is necessary in order to identify issues that could cause performance degradation.
OpenMP loop does not parallelize with continue statement in the catch block
The compiler does not parallelize OpenMP loops that contain a "continue" statement in a C++ catch block inside the parallel region.
Multithreaded debugging issues on Pardus Linux
Due to an issue with the default libthread library on Pardus Linux* version 2011.2, 64-bit, the debugger cannot detect which threading library is being used by the debuggee.
So when using OpenMP* thread commands
idb info <option>
in a debugging session the Intel® IDB Debugger will not provide any OpenMP related thread information. Multithreading debugging however is not affected by this limitation, it's just an issue with displaying the thread info.
Intel Compiler version 11.1 error with OpenMP KMP_SET_STACKSIZE_S()
The OpenMP KMP_SET_STACKSIZE_S() was ignored by OpenMP runtime libraries provided by Intel compiler version 11.1 with build data after 20090401. Need to manually set the environment variable OMP_STACKSIZE before program execution.
OpenMP TASK directive incorrectly defaults to PRIVATE
The default value of the DEFAULT clause on an OpenMP TASK directive or pragma is DEFAULT(PRIVATE). It should be DEFAULT(SHARED). It is recommended that the user set the default explicitly.
Intel® Fortran Compiler - Problems Using Profile Guided Optimization and OpenMP* Concurrently
Use of Profile Guided Optimization with OpenMP* may substantially increase the execution time for the generation of the profile (.dyn file). This is a known issue which is being addressed. The use of profile guided optimization in conjunction with OpenMP is not recommended.
OpenMP static library removal in Intel® MKL on Microsoft Windows*
The OpenMP static runtime library will no longer be included in Intel MKL releases. Users should start linking the OpenMP library dynamically.
Some Performance Advantages of Using a Task-Based Parallelism Model
As part of my focus on software performance, I also support and consult on implementing scalable parallelism in applications. There are many reasons to implement parallelism as well as many methods for doing it - but this blog is not about either of those things. This blog is about the performance advantages of one particular way of implementing parallelism - and, luckily, that way is supported by several models available.
Intel® IPP Threaded Functions
It lists the information where to find the threaded Intel IPP from each release.
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