grondo / flux-core

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Build # 1438

Build Type

push

travis-ci

Committed by grondo

Commit Message

pmi: async kvs_get support for simple PMI server

Problem: The simple PMI server's `kvs_get` operation doesn't allow
the underlying implementation to use asynchronous flux_kvs_lookup()
calls. Since all local PMI tasks connect to the same server, this
serializes kvs lookups in the PMI server implementation, and may
impact scalability of PMI launch with many local tasks.

Split the simple PMI kvs_get operation into  `kvs_get` and
`kvs_get_complete` calls so that an implementation may utilize
asynchronous calls when available.

Switch all call sites to the new kvs_get prototype, and use async
version in wrexexcd's implementation to (hopefully) mitigate
serialization when wrexecd is managing many local tasks.

Fixes #1609

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