{"links":{},"id":98747,"metadata":{"_oai":{"id":"oai:ipsj.ixsq.nii.ac.jp:00098747","sets":["1164:1867:7468:7469"]},"path":["7469"],"owner":"11","recid":"98747","title":["低優先度処理を指定可能なリアルタイム処理向けI/Oスケジューラ"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-02-27"},"_buckets":{"deposit":"e6e17a89-6819-43b7-9500-75d554d6ae1f"},"_deposit":{"id":"98747","pid":{"type":"depid","value":"98747","revision_id":0},"owners":[11],"status":"published","created_by":11},"item_title":"低優先度処理を指定可能なリアルタイム処理向けI/Oスケジューラ","author_link":["0","0"],"item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"低優先度処理を指定可能なリアルタイム処理向けI/Oスケジューラ"},{"subitem_title":"A Deadline I/O Scheduler Equipped with Low Priority Assignment","subitem_title_language":"en"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"ストレージ・I/O","subitem_subject_scheme":"Other"}]},"item_type_id":"4","publish_date":"2014-02-27","item_4_text_3":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"電気通信大学"},{"subitem_text_value":"電気通信大学"},{"subitem_text_value":"電気通信大学"}]},"item_4_text_4":{"attribute_name":"著者所属(英)","attribute_value_mlt":[{"subitem_text_value":"The University of Electro-Communications","subitem_text_language":"en"},{"subitem_text_value":"The University of Electro-Communications","subitem_text_language":"en"},{"subitem_text_value":"The University of Electro-Communications","subitem_text_language":"en"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_publisher":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"情報処理学会","subitem_publisher_language":"ja"}]},"publish_status":"0","weko_shared_id":-1,"item_file_price":{"attribute_name":"Billing file","attribute_type":"file","attribute_value_mlt":[{"url":{"url":"https://ipsj.ixsq.nii.ac.jp/record/98747/files/IPSJ-OS14128008.pdf"},"date":[{"dateType":"Available","dateValue":"2016-02-27"}],"format":"application/pdf","billing":["billing_file"],"filename":"IPSJ-OS14128008.pdf","filesize":[{"value":"728.2 kB"}],"mimetype":"application/pdf","priceinfo":[{"tax":["include_tax"],"price":"660","billingrole":"5"},{"tax":["include_tax"],"price":"330","billingrole":"6"},{"tax":["include_tax"],"price":"0","billingrole":"11"},{"tax":["include_tax"],"price":"0","billingrole":"44"}],"accessrole":"open_date","version_id":"b4e77408-9348-444e-8247-4f7d5640a3ee","displaytype":"detail","licensetype":"license_note","license_note":"Copyright (c) 2014 by the Information Processing Society of Japan"}]},"item_4_creator_5":{"attribute_name":"著者名","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"高村, 成道"},{"creatorName":"鵜川, 始陽"},{"creatorName":"岩崎, 英哉"}],"nameIdentifiers":[{}]}]},"item_4_creator_6":{"attribute_name":"著者名(英)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Narimichi, Takamura","creatorNameLang":"en"},{"creatorName":"Tomoharu, Ugawa","creatorNameLang":"en"},{"creatorName":"Hideya, Iwasaki","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_4_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN10444176","subitem_source_identifier_type":"NCID"}]},"item_4_textarea_12":{"attribute_name":"Notice","attribute_value_mlt":[{"subitem_textarea_value":"SIG Technical Reports are nonrefereed and hence may later appear in any journals, conferences, symposia, etc."}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourceuri":"http://purl.org/coar/resource_type/c_18gh","resourcetype":"technical report"}]},"item_4_description_7":{"attribute_name":"論文抄録","attribute_value_mlt":[{"subitem_description":"近年，リアルタイム性を必要とし，停止できない Web サービスが増加している．それらのメンテナンス処理はサービスを継続した状態で行う必要がある．このようなメンテナンスをオンラインメンテナンスと呼ぶ．オンラインメンテナンスの例には，データの集計や削除がある．オンラインメンテナンスを行う上で，メンテナンス処理の I/O 負荷が Web サービスに悪影響を及ぼすことが問題となっている．たとえば，データベースサーバ上の数百 GB のログファイルを削除するメンテナンスをオンラインで行う場合，大量の I/O 処理が行われデータベース処理が長時間停止するという事態が生じる．このような問題を解決するために，本研究ではメンテナンスの I/O 処理の実行をゆっくりと行う機構を提案する．Linux においては，I/O 処理の実行順序は I/O スケジューラが決定する．そこで，リアルタイム性を必要とする Web サービスのバックエンドで用いられている I/O スケジューラに，低優先度処理を指定する機能を追加した．実験用のデータベースサーバ上で本機構を評価したところ，既存の I/O スケジューラではデータベースと関係のない I/O 処理の実行中にデータベースのスループットが 30%以下に低下したのに対し，提案する I/O スケジューラでは 75%以上となった．","subitem_description_type":"Other"}]},"item_4_description_8":{"attribute_name":"論文抄録(英)","attribute_value_mlt":[{"subitem_description":"The availablity of web services has been incresingly demanded. To achieve high availablity, database servers used in the backends of web services have to respond in a low latency. Maintenance operations (e.g., deleting log files and mining data) executed by an operator may raise a pressure on I/O subsystem, which increases the latency of database processing. To solve this problem, it is desired to execute maintenance operations in low priority. However, the deadline I/O scheduler, which is recommended for database servers on Linux cannot deal with priorities for I/O operations. In this research, we have extended the deadline I/O scheduler to enable us to assign low priority to a process, which is inherited to the children. Our I/O scheduler can suppress the increase of latency by executing the maintenance operations at low priority. We evaluated the usefulness of our I/O scheduler on a database server. While in the deadline I/O scheduler, maintenance operations degraded the throughput of database processing down to less than 30%, in our I/O scheduler they degraded that down to at most 75% by assigning low priority to maintenance operations.","subitem_description_type":"Other"}]},"item_4_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicPageEnd":"10","bibliographic_titles":[{"bibliographic_title":"研究報告システムソフトウェアとオペレーティング・システム（OS）"}],"bibliographicPageStart":"1","bibliographicIssueDates":{"bibliographicIssueDate":"2014-02-27","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"8","bibliographicVolumeNumber":"2014-OS-128"}]},"relation_version_is_last":true,"weko_creator_id":"11"},"created":"2025-01-18T23:44:56.107389+00:00","updated":"2025-01-21T12:19:54.072537+00:00"}