Disco

Bugnion, Edouard; Devine, Scott; Govil, Kinshuk; Rosenblum, Mendel

doi:10.1145/265924.265930

Cited by 239 publications

(179 citation statements)

References 19 publications

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“…Instead of having redundant copies of the same code regions, merging the redundant pages allows to increase the memory density. This concept is further extended to the contents of pages [10]. Data pages including a common data set can be shared in data intensive applications to decrease the memory footprint.…”

Section: Memory Deduplicationmentioning

confidence: 99%

“…In consolidated environments, we may see that a single server hosts the same guest operating systems of virtual machines, the same third-party libraries, and even the same applications [20]. To exploit the qualities, the traditional page sharing technique has been extended to be able to deduplicate the same content pages between virtual machines, called content-based page sharing [7,8,10,20]. The content-based page sharing becomes a popular technique to reduce the memory footprint in virtualized systems.…”

Section: Introductionmentioning

confidence: 99%

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Deduplicating TLB entries for shared pages

Ahn

2018

IEICE Electron. Express

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Although the page sharing among different address spaces can effectively reduce the memory footprint, the corresponding address mappings still require their own TLB entries. Consequently, redundant address mappings for the shared pages reside in TLBs. Our goal in this study is to increase the TLB density by deduplicating redundant copies of address mappings into a single mapping. In virtualized servers, the case of hosting the same guest operating systems, the same third-party libraries, and the same application is commonly found. Such environments generate the multiple identical address mappings, virtual to physical address, for shared pages among different virtual machines. We exploit this unique characteristic of the virtual memory layout being analogous in the same execution environment, and explore TLB deduplication, called DeTLB, which merges redundant virtual to physical address mappings of different address spaces into a single TLB entry. To demonstrate the performance impact, we develop a QEMU based trace simulator and evaluate the number of TLB misses by running an Apache Spark ALS and a microbenchmark with the Linux KSM module. The results indicate that DeTLB can effectively reduce the number of TLB misses for both data and instructions.

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Section: Memory Deduplicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deduplicating TLB entries for shared pages

Ahn

2018

IEICE Electron. Express

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“…A copy-on-write policy is used when shared pages are written. This scheme is similar to content-based page sharing as implemented in VMware [4], Disco [12] or the Linux kernel.…”

Section: Simulation Infrastructurementioning

confidence: 99%

Analyzing Cache Coherence Protocols for Server Consolidation

Garcia-Guirado

Fernández-Pascual

García

2010

2010 22nd International Symposium on Computer Architecture and High Performance Computing

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Abstract-Server consolidation is commonly used today to make the most out of all the cores of a chip multiprocessor by running several virtual machines (VMs) on it. Cache coherence protocols can be adapted to take advantage of such an scenario. In this line, Virtual Hierarchies (VHs) use two levels of cache coherence in a consolidated server. They isolate the coherence actions of each VM and improve performance by maximizing the number of memory accesses serviced by caches within the VM. In this paper we show how hierarchical protocols with no single ordering point for the requests, such as VHs in the form currently proposed, are prone to deadlocks. Besides, when memory deduplication is used, VHs cannot take advantage of memory deduplication at the cache level, both because deduplicated data is reduplicated in cache, and because accesses to deduplicated data often require the access to the cache tiles used by a different VM by means of broadcast. We analyze all these problems and we propose solutions for them, showing the actual performance of these protocols, and giving some insights for the future development of coherence protocols optimized for server consolidation.

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“…Then the certified binary can be installed by the system administrator in a special directory, and added to the allowed list of commands. Alternately a virtual machine [25] with controlled access to disk and network can be provided, and the user can launch his binary within the virtual machine, without waiting for certification of his executables. In addition to being a shell for a controlled user, GISH can also be invoked as a shell for a controlled super-user.…”

Section: A Fine Grain Access Controlmentioning

confidence: 99%

Scoping security issues for interactive grids

Dwoskin

Basu

Talwar

et al.

The Thrity-Seventh Asilomar Conference on Signals, Systems &Amp; Computers, 2003

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interactive grid, grid computing, security Grid computing allows flexible resource sharing among geographically distributed computing resources in multiple administrative domains. Virtualization of resources allows jobs to be run on remote resources participating in a Grid. While this computing paradigm has been used primarily for batch jobs, we study interactive Grid applications rich in graphics and multimedia such as scientific visualization and digital content creation. A host of security issues need to be addressed for such Interactive Grids to gain acceptance, particularly in industry. The purpose of this paper is to scope these security issues.The Grid Security Infrastructure (GSI), a component of the Globus Toolkit [1], creates Grid credentials for every user and resource. We describe how this may be extended to securely set up an interactive session on a remote host, and the additional security issues associated with interactive session management. We propose controlled shell and controlled desktop mechanisms that restrict the user to execute only authorized commands and applications, and controlled user and super-user accounts that customize the shell and desktop using policy files. We also propose a new approach to scoping the security needs of Grid systems by defining three generic scenarios: mutual trust, partial trust and mutual distrust. New security issues arise when the user may not be trusted, or the user and the host computer's owner are mutually suspicious. Abstract-Grid computing allows flexible resource sharing among geographically distributed computing resources in multiple administrative domains. Virtualization of resources allows jobs to be run on remote resources participating in a Grid. While this computing paradigm has been used primarily for batch jobs, we study interactive Grid applications rich in graphics and multimedia such as scientific visualization and digital content creation. A host of security issues need to be addressed for such Interactive Grids to gain acceptance, particularly in industry. The purpose of this paper is to scope these security issues.The Grid Security Infrastructure (GSI), a component of the Globus Toolkit [1], creates Grid credentials for every user and resource. We describe how this may be extended to securely set up an interactive session on a remote host, and the additional security issues associated with interactive session management. We propose controlled shell and controlled desktop mechanisms that restrict the user to execute only authorized commands and applications, and controlled user and super-user accounts that customize the shell and desktop using policy files. We also propose a new approach to scoping the security needs of Grid systems by defining three generic scenarios: mutual trust, partial trust and mutual distrust. New security issues arise when the user may not be trusted, or the user and the host computer's owner are mutually suspicious.

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Disco

Cited by 239 publications

References 19 publications

Deduplicating TLB entries for shared pages

Deduplicating TLB entries for shared pages

Analyzing Cache Coherence Protocols for Server Consolidation

Scoping security issues for interactive grids

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