{"title":"Leveraging Queueing Theory and OS Profiling to Reduce Application Latency","authors":"Anshul Gandhi, Amoghavarsha Suresh","doi":"10.1145/3366625.3368853","DOIUrl":"https://doi.org/10.1145/3366625.3368853","url":null,"abstract":"Request latency is a critical metric in determining the usability of online services, such as web applications and databases. Most existing approaches to improve application latency start by detecting bottlenecks in the application deployment; this typically entails determining stages of processing where the application spends most of its time. Inspired by queueing theory, we present an alternative approach to detect and mitigate bottlenecks âĂrŞ using variability of processing time as a guiding principle when designing applications.","PeriodicalId":155490,"journal":{"name":"Proceedings of the 20th International Middleware Conference Tutorials","volume":"248 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121976491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Suyash Gupta, Jelle Hellings, Sajjad Rahnama, Mohammad Sadoghi
{"title":"An In-Depth Look of BFT Consensus in Blockchain: Challenges and Opportunities","authors":"Suyash Gupta, Jelle Hellings, Sajjad Rahnama, Mohammad Sadoghi","doi":"10.1145/3366625.3369437","DOIUrl":"https://doi.org/10.1145/3366625.3369437","url":null,"abstract":"Since the introduction of Bitcoin---the first wide-spread application driven by blockchains---the interest of the public and private sector in blockchains has skyrocketed. At the core of this interest are the ways in which blockchains can be used to improve data management, e.g., by enabling federated data management via decentralization, resilience against failure and malicious actors via replication and consensus, and strong data provenance via a secured immutable ledger. In practice, high-performance blockchains for data management are usually built in permissioned environments in which the participants are vetted and can be identified. In this setting, blockchains are typically powered by Byzantine fault-tolerant consensus protocols. These consensus protocols are used to provide full replication among all honest blockchain participants by enforcing an unique order of processing incoming requests among the participants. In this tutorial, we take an in-depth look at Byzantine fault-tolerant consensus. First, we take a look at the theory behind replicated computing and consensus. Then, we delve into how common consensus protocols operate. Finally, we take a look at current developments and briefly look at our vision moving forward.","PeriodicalId":155490,"journal":{"name":"Proceedings of the 20th International Middleware Conference Tutorials","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132578868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Proceedings of the 20th International Middleware Conference Tutorials","authors":"","doi":"10.1145/3366625","DOIUrl":"https://doi.org/10.1145/3366625","url":null,"abstract":"","PeriodicalId":155490,"journal":{"name":"Proceedings of the 20th International Middleware Conference Tutorials","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121520410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}