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FreSh

Repository for the paper "FreSh: Lock-Free Index for Sequence Similarity Search", Panagiota Fatourou, Eleftherios Kosmas, Themis Palpanas, George Paterakis. Under review, VLDB 2022.

General

FreSh is the the first lock-free (thus, highly fault-tolerant) data series index that exhibits the same performance as the state-of-the-art lock-based in-memory indexes.

How to compile

To compile FreSh, use:

cd ads/

autoreconf
chmod u+x configure
./configure

automake
make

Before running

Create required folders

mkdir results
mkdir perf

Install jemalloc (for better performance) following the instructions here: 'https://github.com/jemalloc/jemalloc/blob/dev/INSTALL.md'

Parameters

The main parameters of FreSh are listed below:

--timeseries-size [<int>] (default: 256)

--dataset [<string>]

--dataset-size [<int>]

--queries [<string>]

--queries-size [<int>]

--leaf-size [<int>]

--initial-lbl-size

--min-leaf-size

--flush-limit

--in-memory

--cpu-type [<int>]: defines the number of threads

--function-type [<int>]: defines the algorithm to run

--ts-group-length [<int>]

--backoff-power [<int>]: setting it to -1 disables backoff

Examples

./bin/ads --dataset "/spare/ekosmas/Datasets/Random/dataset100GB.bin" --dataset-size "104857600" --queries "/spare/ekosmas/Datasets/Random/query100.bin" --queries-size "100" --leaf-size 2000 --initial-lbl-size 2000 --min-leaf-size 2000 --flush-limit 1000000 --in-memory --cpu-type 80 --function-type 999777013  --ts-group-length 512 --backoff-power -1

./bin/ads --dataset "/spare/ekosmas/Datasets/Sift/sift_len_128.bin" --dataset-size "104857600" --queries "/spare/ekosmas/Datasets/Sift/queries_size100_sift.bin" --queries-size "100" --leaf-size 2000 --initial-lbl-size 2000 --min-leaf-size 2000  --flush-limit 1000000 --in-memory --cpu-type 40 --function-type 999777013 --ts-group-length 512 --backoff-power 100000 --timeseries-size 128

People Involved

Panagiota Fatourou, Professor, University of Crete, ICS-FORTH, University of Paris and LIPADE (faturu@ics.forth.gr)

Eleftherios Kosmas, Postdoctoral Researcher, University of Crete and ICS-FORTH (ekosmas@csd.uoc.gr)

Themis Palpanas, Professor, University of Paris and LIPADE (themis@mi.parisdescartes.fr)

George Paterakis, Student, University of Crete and ICS-FORTH (geopat@ics.forth.gr)

License

This code is provided under the LGPL-2.1 License

FreSh

FreSh is developed under the Platon research project.