{"id":19448391,"url":"https://github.com/carv-ics-forth/parallax","last_synced_at":"2025-04-25T02:31:06.232Z","repository":{"id":74032847,"uuid":"409568002","full_name":"CARV-ICS-FORTH/parallax","owner":"CARV-ICS-FORTH","description":"A persistent key-value store that is embeddable and optimized for fast storage.","archived":false,"fork":false,"pushed_at":"2023-12-07T16:03:13.000Z","size":3362,"stargazers_count":23,"open_issues_count":0,"forks_count":4,"subscribers_count":8,"default_branch":"master","last_synced_at":"2023-12-07T17:25:43.925Z","etag":null,"topics":["storage-engine"],"latest_commit_sha":null,"homepage":"","language":"C","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"other","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/CARV-ICS-FORTH.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":"CONTRIBUTING.md","funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null}},"created_at":"2021-09-23T11:44:22.000Z","updated_at":"2023-12-07T17:26:14.797Z","dependencies_parsed_at":null,"dependency_job_id":"38fa3d27-e4ae-49e5-9d01-4fb35175b1d7","html_url":"https://github.com/CARV-ICS-FORTH/parallax","commit_stats":null,"previous_names":[],"tags_count":0,"template":null,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/CARV-ICS-FORTH%2Fparallax","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/CARV-ICS-FORTH%2Fparallax/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/CARV-ICS-FORTH%2Fparallax/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/CARV-ICS-FORTH%2Fparallax/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/CARV-ICS-FORTH","download_url":"https://codeload.github.com/CARV-ICS-FORTH/parallax/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":250741903,"owners_count":21479694,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["storage-engine"],"created_at":"2024-11-10T16:26:31.233Z","updated_at":"2025-04-25T02:31:05.547Z","avatar_url":"https://github.com/CARV-ICS-FORTH.png","language":"C","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Parallax\nParallax is an LSM-based persistent key-value store designed for flash storage devices (SSDs, NVMe). Parallax reduces I/O amplification and increases CPU efficiency using the following mechanism. It categorizes key-value (KV) pairs into three size-based categories: Small, Medium, and Large. Then it applies a different policy for each category. It stores Small KV pairs inside the LSM levels (as RocksDB). It always performs key-value separation for KV pairs (as BlobDB), writing them in a value log, and it uses a garbage collection (GC) mechanism for the value log. For medium KV pairs, it uses a hybrid policy: It performs KV separation up to the semi-last levels and then stores them in place to bulk-free space without using GC.\n\n\u003c!---![Parallax](https://i.imgur.com/7XYSGwW.jpg)]--\u003e\n\n## Building Parallax\n\nIf you want to use Parallax check the [Build](docs/Build.md) guide.\n\n\n\n\n## Acknowledgements\nIf you want to cite us or find more details in the paper:\n```\nGiorgos Xanthakis, Giorgos Saloustros, Nikos Batsaras, Anastasios Papagiannis, and Angelos Bilas. 2021. Parallax: Hybrid Key-Value Placement in LSM-based Key-Value Stores. In Proceedings of the ACM Symposium on Cloud Computing (SoCC '21). Association for Computing Machinery, New York, NY, USA, 305–318.\nDOI:https://doi.org/10.1145/3472883.3487012\n```\n\nWe thankfully acknowledge the support of the European Commission under the Horizon 2020 Framework Programme for Research and Innovation through the projects EVOLVE (Grant Agreement ID: 825061). This work is (also) partly supported by project EUPEX, which has received funding from the European High-Performance Computing Joint Undertaking (JU) under grant agreement No 101033975. The JU receives support from the European Union's Horizon 2020 re-search and innovation programme and France, Germany, Italy, Greece, United Kingdom, Czech Republic, Croatia.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcarv-ics-forth%2Fparallax","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fcarv-ics-forth%2Fparallax","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcarv-ics-forth%2Fparallax/lists"}