Feature: Migratablelun #3589
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Feature: Migratablelun #3589
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ericjbohm
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evan-charmworks,
stwhite91,
adityapb and
jszaday
Does a simple factorial computation differentiated by rank. Triggers LB. Does more iterations, then has each rank read the output of the next higher rank and check that the values are correct. So if something went wrong with the output process during migration, we hope to trip over it by checking every line of every output file.
Add AMPI_LUN_open as wrapper for register+open
the AMPI_LUN function returns the virtualized version of any LUN see virtluntest.f90 for an example of usage, as it replaces the manual LUN virtualization scheme used in luntest.f90
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I rebased this from the pieglobals-testing branch onto the main branch for review. |
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! Handle the details of migrating LUNs across ranks
! basic idea:
MigratableLUN is a utility to simplify migration for FORTRAN I/O
To use it the application creates the registry using createRegistry()
Application registers each LUN with the API using the same parameters it would use to open the file using registerLUN().
Application calls closeRegisteredLUNSForMigration() in about_to_migrate
Application calls reopenRegisteredLUNs() in just_migrated
Thats is all there is to it, otherwise the normal AMPI rules apply
Implementation assumes it is being used for LUNs associated with files.
YMMV if you need to migrate other LUNs.
MigratableLUN does not solve LUN uniqueness across virtual ranks. It is compatible with CK_LUN, which can be used to address that.