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Locality aware gather #198

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merged 6 commits into from
Dec 16, 2021
Merged

Locality aware gather #198

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72fb3e7
first version at optimised scatter
csegarragonz Dec 13, 2021
14c9cd7
add test for receiver non local leader
csegarragonz Dec 13, 2021
91e95c5
re-factor and organise the hosts to ranks mappings
csegarragonz Dec 13, 2021
c4ce8fe
adding double colons for global namespaces
csegarragonz Dec 15, 2021
550d018
inline set hosts for ranks and re-factor gather to reduce complexity …
csegarragonz Dec 16, 2021
d18e758
add test to check the number of messages sent during gather, and the …
csegarragonz Dec 16, 2021
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11 changes: 6 additions & 5 deletions include/faabric/scheduler/MpiWorld.h
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Original file line number Diff line number Diff line change
Expand Up @@ -224,15 +224,16 @@ class MpiWorld
/* MPI internal messaging layer */

// Track at which host each rank lives
std::vector<std::string> rankHosts;
std::vector<std::string> hostForRank;
int getIndexForRanks(int sendRank, int recvRank);
std::vector<int> getRanksForHost(const std::string& host);

// Track ranks that are local to this world, and local/remote leaders
// Store the ranks that live in each host
std::map<std::string, std::vector<int>> ranksForHost;

// Track local and remote leaders. The leader is stored in the first
// position of the host to ranks map.
// MPITOPTP - this information exists in the broker
int localLeader = -1;
std::vector<int> localRanks;
std::vector<int> remoteLeaders;
void initLocalRemoteLeaders();

// In-memory queues for local messaging
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