Support large single requests made by a process #131
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
PnetCDF uses the following MPI datatype construction functions for large
requests.
MPI_Type_create_subarray_c
MPI_Type_contiguous_c
MPI_Type_create_hvector_c
MPI_Type_create_struct_c
MPI_Type_create_hindexed_c
MPI_Type_vector_c
MPI_Pack_c
MPI_Unpack_c
MPI_Type_get_true_extent_x
MPI_Type_size_x
If all are available, then define HAVE_MPI_LARGE_COUNT and proceed with
constructing large datatypes for fileview and user buffer. Checking
MPI_VERSION against 3 is not sufficient, as some MPI (e.g. OpenMPI
5.0.2) does not support MPI_XXX_c functions.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Starting from MPI standard 3.0, MPI_Count and 4.0
MPI_xxx_cAPIs have beenadded to support large (> 2^31-1) datatypes. This PR checks the availability of
those large count MPI APIs and if they are implemented in the underlying MPI
library, then they will be used to create large datatype for fileview and user
buffer datatypes. This way, we can support large single requests by calling
the same MPI_File_read/write APIs whose count argument is still of type
int.This PR thus deprecates the configure option --enable-large-single-req