{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:O7VKPV4P7WHWDS6HK5PFBBQEPI","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"42437d7ec06276978d7aabd18fe2a424edd756ae661125f076ef900d7ed7aa9c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.DC","submitted_at":"2026-05-28T14:07:55Z","title_canon_sha256":"79e5d9450b2f708c65739c3b98f223176a117444d4204db8cc495f0c2817a900"},"schema_version":"1.0","source":{"id":"2605.29970","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.29970","created_at":"2026-05-29T02:06:04Z"},{"alias_kind":"arxiv_version","alias_value":"2605.29970v1","created_at":"2026-05-29T02:06:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.29970","created_at":"2026-05-29T02:06:04Z"},{"alias_kind":"pith_short_12","alias_value":"O7VKPV4P7WHW","created_at":"2026-05-29T02:06:04Z"},{"alias_kind":"pith_short_16","alias_value":"O7VKPV4P7WHWDS6H","created_at":"2026-05-29T02:06:04Z"},{"alias_kind":"pith_short_8","alias_value":"O7VKPV4P","created_at":"2026-05-29T02:06:04Z"}],"graph_snapshots":[{"event_id":"sha256:1ef9bf1571277a81ddad3b7c6e21bbb12aee7c2c170ce50988aed4d0acdfe273","target":"graph","created_at":"2026-05-29T02:06:04Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2605.29970/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present and show how to implement a non-trivial all-to-all communication algorithm for arbitrary $d$-dimensional tori effectively in MPI. Given a factorization of the number of processes $p$ into $d$ factors that can be mapped onto a $d$-dimensional torus, we first utilize a Cartesian communicator to split a given $p$-process MPI communicator into, for each MPI process, $d$ smaller communicators spanning each of the dimensions of the torus to which the process belongs, and cache these communicators in order to avoid expensive splitting at each all-to-all operation. The all-to-all operation ","authors_text":"Jesper Larsson Tr\\\"aff","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.DC","submitted_at":"2026-05-28T14:07:55Z","title":"Effective MPI: User-defined Datatypes and Cartesian Communicators for Zero-copy All-to-all Communication in Multidimensional Tori"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.29970","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:b9fb711c94244ea9ed2d67e1861f2fc1b0b42888a3e9bf767cdc5626e88e6fad","target":"record","created_at":"2026-05-29T02:06:04Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"42437d7ec06276978d7aabd18fe2a424edd756ae661125f076ef900d7ed7aa9c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.DC","submitted_at":"2026-05-28T14:07:55Z","title_canon_sha256":"79e5d9450b2f708c65739c3b98f223176a117444d4204db8cc495f0c2817a900"},"schema_version":"1.0","source":{"id":"2605.29970","kind":"arxiv","version":1}},"canonical_sha256":"77eaa7d78ffd8f61cbc7575e5086047a39f74edd4a7f64f73712aa159509eb28","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"77eaa7d78ffd8f61cbc7575e5086047a39f74edd4a7f64f73712aa159509eb28","first_computed_at":"2026-05-29T02:06:04.537596Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-29T02:06:04.537596Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rkjSCddNBdGIeseHRe5ZeN95azbhv+MgZyu0xFVEvwCb/82TR2mZczHWfNSGtQeLpZW6ldrXRjVQE+7cimzqAg==","signature_status":"signed_v1","signed_at":"2026-05-29T02:06:04.538434Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.29970","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b9fb711c94244ea9ed2d67e1861f2fc1b0b42888a3e9bf767cdc5626e88e6fad","sha256:1ef9bf1571277a81ddad3b7c6e21bbb12aee7c2c170ce50988aed4d0acdfe273"],"state_sha256":"34f6af106c24669d96cdc931049f9553b82a08f227194d5157e934d057d81730"}