5.11. Graphcore Communication Library (GCL)
3.0.0
New features
The GCL option
syncful.useForwardingToSupportStridedGroups=auto
is now exposed externally.By doing through-routing over intermediate replicas, sliding window reachability is extended for certain configurations. For a replica size equal to 1, this option avoids deadlocks.
Bug Fixes
The broadcast method is no longer selected when the stride is greater than 1.
Three-phase collective operations are now scheduled properly for consecutive communication groups that span multiple glossary:ILDs.
Other improvements
The GCL documentation has been updated and split out into a separate document: GCL User Guide and API Reference. More detail on collective operations and logical topologies has been added.
Added getters to the public API.
Known issues
None
Compatibility changes
Removed the
useSynclessCollectives
option from the public API. The option was deprecated in SDK 2.6 and has now been removed.Renamed
libgcl_ct.so
tolibgcl.so
. The GCL shared library was renamed which means that programs directly linking with GCL need to pass the-lgcl
flag to the linker instead of-lgcl_ct
.