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Displaying 1-18 out of 18 total
The need for speed and stability in data center power capping
Found in: 2012 International Green Computing Conference (IGCC)
By Arka A. Bhattacharya,David Culler,Aman Kansal,Sriram Govindan,Sriram Sankar
Issue Date:June 2012
pp. 1-10
Data centers can lower costs significantly by pro-visioning expensive electrical equipment (such as UPS, diesel generators, and cooling capacity) for the actual peak power consumption rather than server nameplate power ratings. However, it is possible that...
Concurrent Runtime Monitoring of Formally Specified Programs
Found in: Computer
By Sriram Sankar, Manas Mandal
Issue Date:March 1993
pp. 32-41
<p>A methodology for continuously monitoring a program for specification consistency during program execution is described. Prior development of the formal specification and program is assumed. The program is annotated with constructs from a formal s...
ECHO: Recreating network traffic maps for datacenters with tens of thousands of servers
Found in: 2012 IEEE International Symposium on Workload Characterization (IISWC)
By Christina Delimitrou,Sriram Sankar,Aman Kansal,Christos Kozyrakis
Issue Date:November 2012
pp. 14-24
Large-scale datacenters now host a large part of the world's data and computation, which makes their design a crucial architectural challenge. Datacenter (DC) applications, unlike traditional workloads, are dominated by user patterns that only emerge in th...
Decoupling Datacenter Storage Studies from Access to Large-Scale Applications
Found in: IEEE Computer Architecture Letters
By Christina Delimitrou,Sriram Sankar,Kushagra Vaid,Christos Kozyrakis
Issue Date:July 2012
pp. 53-56
Suboptimal storage design has significant cost and power impact in large-scale datacenters (DCs). Performance, power and cost-optimized systems require deep understanding of target workloads, and mechanisms to effectively model different storage design cho...
Decoupling datacenter studies from access to large-scale applications: A modeling approach for storage workloads
Found in: IEEE Workload Characterization Symposium
By Christina Delimitrou,Sriram Sankar,Kushagra Vaid,Christos Kozyrakis
Issue Date:November 2011
pp. 51-60
The cost and power impact of suboptimal storage configurations is significant in datacenters (DCs) as inefficiencies are aggregated over several thousand servers and represent considerable losses in capital and operating costs. Designing performance, power...
Impact of temperature on hard disk drive reliability in large datacenters
Found in: Dependable Systems and Networks, International Conference on
By Sriram Sankar,Mark Shaw,Kushagra Vaid
Issue Date:June 2011
pp. 530-537
When datacenters are pushed to their limits of operational efficiency, reducing failure rates becomes critical for maintaining high levels of healthy server operation. In this experience report, we present a dense storage case study from a large population...
Storage I/O generation and replay for datacenter applications
Found in: Performance Analysis of Systems and Software, IEEE International Symmposium on
By Christina Delimitrou, Sriram Sankar, Kushagra Vaid, Christos Kozyrakis
Issue Date:April 2011
pp. 123-124
With the advent of social networking and cloud data-stores, user data is increasingly being stored in large capacity and high performance storage systems, which account for a significant portion of the total cost of ownership of a datacenter (DC) [3]. One ...
Server Engineering Insights for Large-Scale Online Services
Found in: IEEE Micro
By Christos Kozyrakis, Aman Kansal, Sriram Sankar, Kushagra Vaid
Issue Date:July 2010
pp. 8-19
<p>The rapid growth of online services in the last decade has led to the development of large data centers to host these workloads. These large-scale online, user-facing services have unique engineering and capacity provisioning design requirements. ...
Using Intradisk Parallelism to Build Energy-Efficient Storage Systems
Found in: IEEE Micro
By Sudhanva Gurumurthi, Sriram Sankar, Mircea R. Stan
Issue Date:January 2009
pp. 50-61
<p>Server storage systems use numerous disks to achieve high performance, thereby consuming a significant amount of power. Intradisk parallelism can significantly reduce such systems' power consumption by letting disk drives exploit parallelism in th...
Sensitivity-Based Optimization of Disk Architecture
Found in: IEEE Transactions on Computers
By Sriram Sankar, Yan Zhang, Sudhanva Gurumurthi, Mircea R. Stan
Issue Date:January 2009
pp. 69-81
Storage plays a pivotal role in the performance of many applications. Many applications, especially those that run on servers, are I/O intensive and therefore require high performance storage systems. These high-end storage systems consume a large amount o...
Intra-disk Parallelism: An Idea Whose Time Has Come
Found in: Computer Architecture, International Symposium on
By Sriram Sankar, Sudhanva Gurumurthi, Mircea R. Stan
Issue Date:June 2008
pp. 303-314
Server storage systems use a large number of disks to achieve high performance, thereby consuming a significant amount of power. In this paper, we propose to significantly reduce the power consumed by such storage systems via intra-disk parallelism, wherei...
Two-Dimensional Pinpointing: Debugging with Normal Specifications
Found in: IEEE Software
By David Luckham, Sriram Sankar, Shuzo Takahashi
Issue Date:January 1991
pp. 74-84
<p>Debugging techniques and tools that draw on both the high-level concepts (defined as functions) used in formal specifications and the abstraction and information-hiding constructs used in modern languages are described. The technique is based on t...
Soft Failures in Large Datacenters
Found in: IEEE Computer Architecture Letters
By Sriram Sankar,Sudhanva Gurumurthi
Issue Date:August 2013
pp. 1
A major problem in managing large-scale datacenters is diagnosing and fixing machine failures. Most large datacenter deployments have a management infrastructure that diagnoses failure causes, and also manages assets that were fixed as part of the repair p...
Datacenter Scale Evaluation of the Impact of Temperature on Hard Disk Drive Failures
Found in: ACM Transactions on Storage (TOS)
By Kushagra Vaid, Mark Shaw, Sriram Sankar, Sudhanva Gurumurthi
Issue Date:July 2013
pp. 1-24
With the advent of cloud computing and online services, large enterprises rely heavily on their datacenters to serve end users. A large datacenter facility incurs increased maintenance costs in addition to service unavailability when there are increased fa...
Addressing the stranded power problem in datacenters using storage workload characterization
Found in: Proceedings of the first joint WOSP/SIPEW international conference on Performance engineering (WOSP/SIPEW '10)
By Kushagra Vaid, Sriram Sankar
Issue Date:January 2010
pp. 217-222
Datacenter operators face unique challenges to optimally provision power among deployed servers. Allocated server power is frequently over-provisioned and this results in stranding of available datacenter power capacity. Standardized power efficiency bench...
Structural specification-based testing with ADL
Found in: Proceedings of the 1996 international symposium on Software testing and analysis (ISSTA '96)
By Debra J. Richardson, Juei Chang, Sriram Sankar
Issue Date:January 1996
pp. 240
This paper describes a specification-based black-box technique for testing program units. The main contribution is the method that we have developed to derive test conditions, which are descriptions of test cases, from the formal specification of each prog...
Run-time consistency checking of algebraic specifications
Found in: Proceedings of the symposium on Testing, analysis, and verification (TAV4)
By Sriram Sankar
Issue Date:October 1991
pp. 123-129
Integration of multiple testing techniques is required to demonstrate high quality of software. Technique integration has four basic goals: reduced development costs, incremental testing capabilities, extensive error detection, and cost-effective applicati...
Exploiting locality in maintaining potential causality
Found in: Proceedings of the tenth annual ACM symposium on Principles of distributed computing (PODC '91)
By James Vera, Sigurd Meldal, Sriram Sankar
Issue Date:August 1991
pp. 231-239
An efficient distributed algorithm to detect deadlocks in distributed and dynamically changing systems is presented. In our model, processes can request any N available resources from a pool of size M. This is a generalization of the well-known AND-OR requ...