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#Eunomia Tree Example

This is copy of source code of Eunomia Tree with several examples to show the effectiveness of such a tree design.

##Implementation

Most implementation code of Eunomia Tree is in memstore/memstore_eunotree.h. There is a copy of memstore_eunotree.h in the top directory. All the functions related to pseudocode issues are explained in detail in the source file.

##Core Algorithm Implementations

###Section 3.2.1 Splitting HTM Region In this section, we split the monolithic HTM scope into two parts: upper region and lower region.

Such design is implemented in GetWithInsert() function in memstore/memstore_eunotree.h.

###Section 3.2.2 Distributed Leaf Nodes This section relates the partitioned leaf node structure, including the write scheduler, segments, and reserved keys.

Such design is implemented in struct LeafNode in memstore/memstore_eunotree.h.

###Section 3.2.3 Conflict Control Module This section explains the data structure and mechanism of Conflict Control Module.

Such design is implemented in util/ccm.h

###Section 3.3.1 Get/Put Interfaces This section describes the Get/Put interfaces of Eunomia, including a piece of pseudocode (Algorithm 2).

Such algorithm is implemented in GetWithInsert() and Get() function in memstore/memstore_eunotree.h.

###Section 3.3.2 Insertions This section elaborates the mechanism of inserting new keys in an existing leaf node, including a piece of pesudocode (Algorithm 3).

Such algorithm is implemented in ShuffleLeafInsert() function in memstore/memstore_eunotree.h.

###Section 3.3.3 Splits This section illustrates the mechanism of spliting a full leaf node.

Such algorithm is implemented in ShuffleLeafInsert() and ScopeInsert() function in memstore/memstore_eunotree.h

##Experimental Setup in Our Paper

• CPU: 2.30GHz Intel(R) Xeon(R) E5-2650
• Cores: 2 sockets, each with 10 cores
• Cache: 32KB L1-I Cache, 32KB L1-D Cache, 256KB L2 Cache, 25MB L3 Cache
• DRAM: 256GB
• Workloads: Yahoo! Cloud Serving Benchmark (YCSB)

##Building Eunomia Tree with YCSB Workloads ./make_ycsb.sh

##Running Exmaples
cd ./script ./run_example.sh