{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:P36NZEAIR5IV2P5TUYGR3LWOEN","short_pith_number":"pith:P36NZEAI","canonical_record":{"source":{"id":"1811.00355","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-11-01T13:15:02Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"e1e19764cb74eb2961ee269d5d08c00868644a3323cf0bd5ca5f90e1dcc27e75","abstract_canon_sha256":"15543644a88df814a6dd6e0429b47122973b85478d5d04cf687bc8228689188e"},"schema_version":"1.0"},"canonical_sha256":"7efcdc90088f515d3fb3a60d1daece237da19098f3fe79181d4ceb1df775bfaf","source":{"kind":"arxiv","id":"1811.00355","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.00355","created_at":"2026-05-17T23:49:50Z"},{"alias_kind":"arxiv_version","alias_value":"1811.00355v2","created_at":"2026-05-17T23:49:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.00355","created_at":"2026-05-17T23:49:50Z"},{"alias_kind":"pith_short_12","alias_value":"P36NZEAIR5IV","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"P36NZEAIR5IV2P5T","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"P36NZEAI","created_at":"2026-05-18T12:32:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:P36NZEAIR5IV2P5TUYGR3LWOEN","target":"record","payload":{"canonical_record":{"source":{"id":"1811.00355","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-11-01T13:15:02Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"e1e19764cb74eb2961ee269d5d08c00868644a3323cf0bd5ca5f90e1dcc27e75","abstract_canon_sha256":"15543644a88df814a6dd6e0429b47122973b85478d5d04cf687bc8228689188e"},"schema_version":"1.0"},"canonical_sha256":"7efcdc90088f515d3fb3a60d1daece237da19098f3fe79181d4ceb1df775bfaf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:50.636982Z","signature_b64":"t5FhYxz5Cx4QsKUqiHD9xNXp78uavtJVXGUAxaBMUwt82Ltj3GCnaIOh0BFreuhnEAXHJ9o5tA275mfCvGiRBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7efcdc90088f515d3fb3a60d1daece237da19098f3fe79181d4ceb1df775bfaf","last_reissued_at":"2026-05-17T23:49:50.636543Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:50.636543Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.00355","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:49:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BF+Ka2Mjm1/5HXgSWWm5d0Cut4VcBHvbYxsPj/g7zDjyRPYutlvN5eibsNtwreluyyCrSA4Ym4o7OIv8IuhzBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T02:42:42.611893Z"},"content_sha256":"39bb2b31f52eff3a1046766739f378e4120bbf5777d4d21f2b2a1c8fe08b4ce6","schema_version":"1.0","event_id":"sha256:39bb2b31f52eff3a1046766739f378e4120bbf5777d4d21f2b2a1c8fe08b4ce6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:P36NZEAIR5IV2P5TUYGR3LWOEN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Porting DDalphaAMG solver to K computer","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.comp-ph"],"primary_cat":"hep-lat","authors_text":"Issaku Kanamori, Ken-Ichi Ishikawa","submitted_at":"2018-11-01T13:15:02Z","abstract_excerpt":"We port Domain-Decomposed-alpha-AMG solver to the K computer. The system has 8 cores and 16 GB memory per node, of which theoretical peak is 128 GFlops (82,944 nodes in total). Its feature, as many as 256 registers per core and as large as 0.5 byte/Flop ratio, requires a different tuning from other machines. In order to use more registers, we change some of the data structure and rewrite matrix-vector operations with intrinsics. The performance is improved by more than a factor two for twelve solves including the setup. The efficiency is still about 5% after the optimization, which is lower th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.00355","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:49:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0+pudonLDn2yuoDRnpGIwPtTfxzvybYUwjK+B5hFw7Z9idW7rwi6MeM3ulR+BMYt/Dcni0R/GJgKlb+FovF9CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T02:42:42.612567Z"},"content_sha256":"49627c3ba5c1649cb86a66fba7a3c6e0af04c237d67f47b306074803dc959227","schema_version":"1.0","event_id":"sha256:49627c3ba5c1649cb86a66fba7a3c6e0af04c237d67f47b306074803dc959227"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P36NZEAIR5IV2P5TUYGR3LWOEN/bundle.json","state_url":"https://pith.science/pith/P36NZEAIR5IV2P5TUYGR3LWOEN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P36NZEAIR5IV2P5TUYGR3LWOEN/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-31T02:42:42Z","links":{"resolver":"https://pith.science/pith/P36NZEAIR5IV2P5TUYGR3LWOEN","bundle":"https://pith.science/pith/P36NZEAIR5IV2P5TUYGR3LWOEN/bundle.json","state":"https://pith.science/pith/P36NZEAIR5IV2P5TUYGR3LWOEN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P36NZEAIR5IV2P5TUYGR3LWOEN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:P36NZEAIR5IV2P5TUYGR3LWOEN","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":"15543644a88df814a6dd6e0429b47122973b85478d5d04cf687bc8228689188e","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-11-01T13:15:02Z","title_canon_sha256":"e1e19764cb74eb2961ee269d5d08c00868644a3323cf0bd5ca5f90e1dcc27e75"},"schema_version":"1.0","source":{"id":"1811.00355","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.00355","created_at":"2026-05-17T23:49:50Z"},{"alias_kind":"arxiv_version","alias_value":"1811.00355v2","created_at":"2026-05-17T23:49:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.00355","created_at":"2026-05-17T23:49:50Z"},{"alias_kind":"pith_short_12","alias_value":"P36NZEAIR5IV","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"P36NZEAIR5IV2P5T","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"P36NZEAI","created_at":"2026-05-18T12:32:43Z"}],"graph_snapshots":[{"event_id":"sha256:49627c3ba5c1649cb86a66fba7a3c6e0af04c237d67f47b306074803dc959227","target":"graph","created_at":"2026-05-17T23:49:50Z","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"},"paper":{"abstract_excerpt":"We port Domain-Decomposed-alpha-AMG solver to the K computer. The system has 8 cores and 16 GB memory per node, of which theoretical peak is 128 GFlops (82,944 nodes in total). Its feature, as many as 256 registers per core and as large as 0.5 byte/Flop ratio, requires a different tuning from other machines. In order to use more registers, we change some of the data structure and rewrite matrix-vector operations with intrinsics. The performance is improved by more than a factor two for twelve solves including the setup. The efficiency is still about 5% after the optimization, which is lower th","authors_text":"Issaku Kanamori, Ken-Ichi Ishikawa","cross_cats":["physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-11-01T13:15:02Z","title":"Porting DDalphaAMG solver to K computer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.00355","kind":"arxiv","version":2},"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":"sha256:39bb2b31f52eff3a1046766739f378e4120bbf5777d4d21f2b2a1c8fe08b4ce6","target":"record","created_at":"2026-05-17T23:49:50Z","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":"15543644a88df814a6dd6e0429b47122973b85478d5d04cf687bc8228689188e","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-11-01T13:15:02Z","title_canon_sha256":"e1e19764cb74eb2961ee269d5d08c00868644a3323cf0bd5ca5f90e1dcc27e75"},"schema_version":"1.0","source":{"id":"1811.00355","kind":"arxiv","version":2}},"canonical_sha256":"7efcdc90088f515d3fb3a60d1daece237da19098f3fe79181d4ceb1df775bfaf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7efcdc90088f515d3fb3a60d1daece237da19098f3fe79181d4ceb1df775bfaf","first_computed_at":"2026-05-17T23:49:50.636543Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:50.636543Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"t5FhYxz5Cx4QsKUqiHD9xNXp78uavtJVXGUAxaBMUwt82Ltj3GCnaIOh0BFreuhnEAXHJ9o5tA275mfCvGiRBA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:50.636982Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.00355","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:39bb2b31f52eff3a1046766739f378e4120bbf5777d4d21f2b2a1c8fe08b4ce6","sha256:49627c3ba5c1649cb86a66fba7a3c6e0af04c237d67f47b306074803dc959227"],"state_sha256":"8a11964e38d69afd97851d97ac3497a1b5e7059c5a818312b1e5b8da9c884e38"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0VlS2SfPadidaJtCXDag9P/trS7YbSHtncvcvFGFWNLjpOYl60If+D950Ze7VfOmVF9ks0Dkq/2H56rNAKK4Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T02:42:42.615752Z","bundle_sha256":"2e32ba5a4dde7799e6e97ee902899ca805f4842042543b2a46b97d7c592ed999"}}