Many OpenACC tutorials assume that the compiler/accelerator will check for correctness, by automatically inspecting dependencies and ensuring that the loop is actually parallelizable. However, the OpenACC specification doesn't seem to mention anything about mandatory correctness analysis. Are OpenACC compilers OBLIGATED to check if loops are actually parallelizable and give up if they're not?
Is dependence analysis mandatory for OpenACC compilers?
63 Views Asked by Pericles Alves At
1
There are 1 best solutions below
Related Questions in OPENACC
- Why is my code crashing with "Illegal address during kernel execution" when I use subroutines to copy or deallocate members of derived type variables?
- Advice on porting nested routines to OpenACC
- How to translate Fortran move_alloc intrinsic in OpenACC kernel?
- Attempt to parallelize despite the data dependencies
- Undefined references to GOACC_ symbols when linking CFD solver using OpenACC
- OpenAcc program built with C++ compiler is way slower than C built version
- "undefined reference to `GOACC_parallel_keyed' " and related errors coming up while running make command
- Erroneous result using OpenACC "collapse" when too many levels are collapsed
- libquadmath.o.dylib found by gcc, but not mpicc
- Why does "#pragma omp loop for" produce a compile error?
- Issue with Writing Array Elements to File in OpenACC
- Unable to access CUDA device with OpenACC on WSL2 Ubuntu: Error code=34
- Problem with !$acc declare create directive
- Long cuMemToHostAlloc call after exiting a kernel with copyout
- How to `std::shuffle` CSR arrays in OpenACC
Related Questions in PGI
- openacc - discrepancies between ta=multicore and ta=nvidia compilation
- Pinned memory in OpenACC (using PGI compiler)
- report PGCC-S-0000-Internal errors for _mp_malloc while there's no heap allocations
- cuDevicePrimaryCtxRetain returns CUDA_ERROR_INVALID_DEVICE after acc_init
- Linking PGI OpenACC Runtime Library directly with gcc
- Interpreting PGI_ACC_TIME output
- status of getting PGI compiler
- pgf77 vs pgf90 to compile software
- Unknown libraries for PGI compiler
- parallel make with pgi compiler
- Attempt to parallelize despite the data dependencies
- Are PGI Compilers pre-installed in google colab?
- Obtain OpenACC free (or total) device memory
- PGI Compiler Parallelization +=
- C/C++ and GNU/PGI: undefined reference to `__pgio_ini'
Related Questions in PGI-ACCELERATOR
- Accelerate the use of MPI types
- Reference Argument Passing with Nested OpenACC Routines
- Python C extension compiled with nvc++ OpenMP offloading cannot run on GPU
- OpenACC duplicate array on device
- Array access in async OpenACC kernels
- Illegal context for vector clause in simple OpenACC kernel
- Sequential dot_product in OpenACC Fortran loop
- Matmul in OpenACC Fortran loop
- Obtain OpenACC free (or total) device memory
- OpenACC routine vector with intent out argument
- How can Fortran-OpenACC contained subroutine access data from parent subroutine
- Unknown libraries for PGI compiler
- OpenACC firstprivate variables
- Routines inside acc parallel region
- Disrepancy in results between OpenMP/OpenACC implementation and gcc/PGI compilers
Related Questions in PGCC
- OpenAcc program built with C++ compiler is way slower than C built version
- openacc error when assigning values to dynamically allocated struct member array of struct referenced by pointer
- OpenACC: How to select an array on device from a pointer to corresponding array on host
- Using openmp to distribute matrix multiplication work across multiple GPUs via openacc using C
- Why does mixed binary with Haskell and OpenACC get SEGV?
- Compile FFTW with pgcc, undefined reference
- openACC passing a list of struct
- Is dependence analysis mandatory for OpenACC compilers?
- Using OpenACC to parallelize nested loops
- equivalent of pgcc "-Minfo=" flag for gcc compiler?
- PGC map but no entry
- pgcc, C - Loop not parallelized: may not be beneficial
- C, pgcc - automatic parallelization "not countable"
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
The compiler is required to analyze loops to determine if they are data independent when the "loop" directive's "auto" clause is used. (See section 2.9.6 of the OpenACC standard).
For loops within a "kernels" construct, "auto" is enabled by default unless either the "independent" or "seq" clauses are used.
For "loop" directives within a "parallel" construct, "auto" is not enabled by default hence the decorated loops are presumed independent.