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# Author: mike

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# Github: mikecb starred CanonicalLtd/candid

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# Log(Graph): A Near-Optimal High-Performance Graph Representation

Today’s graphs used in domains such as machine learning or

social network analysis may contain hundreds of billions of

edges. Yet, they are not necessarily stored efficiently, and standard

graph representations such as adjacency lists waste a

significant number of bits while graph compression schemes

such as WebGraph often require time-consuming decompression.

To address this, we propose Log(Graph): a graph representation

that combines high compression ratios with very

low-overhead decompression to enable cheaper and faster

graph processing. The key idea is to encode a graph so that

the parts of the representation approach or match the respective

storage lower bounds. We call our approach “graph

logarithmization” because these bounds are usually logarithmic.

Our high-performance Log(Graph) implementation

based on modern bitwise operations and state-of-the-art succinct

data structures achieves high compression ratios as well

as performance. For example, compared to the tuned Graph

Algorithm Processing Benchmark Suite (GAPBS), it reduces

graph sizes by 20-35% while matching GAPBS’ performance

or even delivering speedups due to reducing amounts of

transferred data. It approaches the compression ratio of the

established WebGraph compression library while enabling

speedups of up to more than 2×. Log(Graph) can improve

the design of various graph processing engines or libraries on

single NUMA nodes as well as distributed-memory systems

Source: https://people.csail.mit.edu/jshun/papers/loggraph.pdf

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