Google's search infrastructure uses a cluster architecture with thousands of machines to handle high query volumes. It employs techniques like PageRank to measure page importance, replicates data for reliability and availability, uses low-cost commodity hardware, and manages power usage. Key systems include the Google File System for storage and MapReduce for distributed processing of large datasets.
This Presentation was prepared by Abdussamad Muntahi for the Seminar on High Performance Computing on 11/7/13 (Thursday) Organized by BRAC University Computer Club (BUCC) in collaboration with BRAC University Electronics and Electrical Club (BUEEC).
This Presentation was prepared by Abdussamad Muntahi for the Seminar on High Performance Computing on 11/7/13 (Thursday) Organized by BRAC University Computer Club (BUCC) in collaboration with BRAC University Electronics and Electrical Club (BUEEC).
The Cassandra architecture shines at ensuring a very high availability of data even while nodes are failing or are overloaded. On the other hand, query latency will often rise during these events, especially on the higher percentiles. Many improvements have been made to reduce this effect over the past years. This talk will focus on one in particular: Speculative Retries. Introduced in Cassandra 2.0 on the server side and in the Java Driver 3.0 on the client side, this strategy remains complex to fully understand and to finely tune. This talk will deep dive into theoretical and practical aspects of Speculative Retries, showing the effect of tuning strategies with ad-hoc benchmarks.
About the Speakers
Michael Figuiere Cloud Platform Engineer, Netflix
Michael is a senior software engineer at Netflix where he works on improving the cloud storage infrastructure. He previously worked at Apple and DataStax where he worked for several years on creating Drivers and Developer Tools for Cassandra. At ease with both enterprise applications and lower level technologies, he specializes in distributed architectures and topics such as databases, search engines, and cloud.
Minh Do Senior Distributed Engineer, Netflix
Minh Do has been working at Netflix for the last several years to run, patch, and troubleshoot Cassandra on both server and client sides, and is also a co-creator of Dynomite project. Prior to Netflix, at Tango, he spearheaded its Big Data pipeline system from the ground using Spark/Hadoop. Before that, at Qualys, he built a distributed queue system that bridges traffics between all major components. He has passion in distributed system, machine learning/deep learning, and data storages.
Take an in-depth look at data warehousing with Amazon Redshift and get answers to your technical questions. We will cover performance tuning techniques that take advantage of Amazon Redshift's columnar technology and massively parallel processing architecture. We will also discuss best practices for migrating from existing data warehouses, optimizing your schema, loading data efficiently, and using work load management and interleaved sorting.
This webinar by Dov Nimratz (Senior Solution Architect, Consultant, GlobalLogic) was delivered at Embedded Community Webinar #1 on July 7, 2020.
Webinar agenda:
- CPU / GPU / TPU architectures
- Historical context
- CPU and their variations
- GPU or gin in a bottle for artificial intelligence tasks
- TPU architecture specialized artificial intelligence accelerator
- What's next in technology
More details and presentation: https://www.globallogic.com/ua/about/events/embedded-community-webinar-1/
Improving Apache Spark by Taking Advantage of Disaggregated ArchitectureDatabricks
Shuffle in Apache Spark is an intermediate phrase redistributing data across computing units, which has one important primitive that the shuffle data is persisted on local disks. This architecture suffers from some scalability and reliability issues. Moreover, the assumptions of collocated storage do not always hold in today's data centers. The hardware trend is moving to disaggregated storage and compute architecture for better cost efficiency and scalability. To address the issues of Spark shuffle and support disaggregated storage and compute architecture, we implemented a new remote Spark shuffle manager. This new architecture writes shuffle data to a remote cluster with different Hadoop-compatible filesystem backends. Firstly, the failure of compute nodes will no longer cause shuffle data recomputation. Spark executors can also be allocated and recycled dynamically which results in better resource utilization. Secondly, for most customers currently running Spark with collocated storage, it is usually challenging for them to upgrade the disks on every node to latest hardware like NVMe SSD and persistent memory because of cost consideration and system compatibility. With this new shuffle manager, they are free to build a separated cluster storing and serving the shuffle data, leveraging the latest hardware to improve the performance and reliability. Thirdly, in HPC world, more customers are trying Spark as their high performance data analytics tools, while storage and compute in HPC clusters are typically disaggregated. This work will make their life easier. In this talk, we will present an overview of the issues of the current Spark shuffle implementation, the design of new remote shuffle manager, and a performance study of the work.
This talk will describe the changes which went into MongoDB 3.0 in order to allow storage engines to achieve their maximum concurrency potential. In MongoDB 3.0, concurrency control has been separated into two levels: top-level, which protects the database catalog, and storage engine-level, which allows each individual storage engine implementation to manage its own concurrency. We will start from the top and introduce the concept of multi-granularity locking and how it protects the database catalog. We will then explain how the MongoDB lock manager works and how it allows storage engines to manage their own concurrency control without imposing any additional overhead.
I promise that understand NoSQL is as easy as playing with LEGO bricks ! The Google Bigtable presented in 2006 is the inspiration for Apache HBase: let's take a deep dive into Bigtable to better understand Hbase.
New Accelerated Compute Infrastructure Solutions from SupermicroRebekah Rodriguez
Join us for a special edition of Supermicro’s TECHTalk as we introduce Supermicro’s new accelerated compute infrastructure solutions. A number of Supermicro experts will share insights and updates on one of the industry’s broadest portfolios of NVIDIA-Certified GPU systems, which deliver new levels of performance for AI infrastructure with the new H100 Tensor Core GPUs.
Memory organization
Memory Organization in Computer Architecture. A memory unit is the collection of storage units or devices together. The memory unit stores the binary information in the form of bits. ... Volatile Memory: This loses its data, when power is switched off.
Linux Memory Management
1.Memory Structure of Linux OS.
2.How Program is loaded into the memory.
3.Address Translation.
4.Feature for Multithreading and Multiprocessing.
The Anatomy Of The Google Architecture Fina Lv1.1Hassy Veldstra
A comprehensive overview of Google's architecture - starting from the search page and all the way to its internal networks.
By Ed Austin, talk given at Edinburgh Techmeetup in December 2009
http://techmeetup.co.uk
The Cassandra architecture shines at ensuring a very high availability of data even while nodes are failing or are overloaded. On the other hand, query latency will often rise during these events, especially on the higher percentiles. Many improvements have been made to reduce this effect over the past years. This talk will focus on one in particular: Speculative Retries. Introduced in Cassandra 2.0 on the server side and in the Java Driver 3.0 on the client side, this strategy remains complex to fully understand and to finely tune. This talk will deep dive into theoretical and practical aspects of Speculative Retries, showing the effect of tuning strategies with ad-hoc benchmarks.
About the Speakers
Michael Figuiere Cloud Platform Engineer, Netflix
Michael is a senior software engineer at Netflix where he works on improving the cloud storage infrastructure. He previously worked at Apple and DataStax where he worked for several years on creating Drivers and Developer Tools for Cassandra. At ease with both enterprise applications and lower level technologies, he specializes in distributed architectures and topics such as databases, search engines, and cloud.
Minh Do Senior Distributed Engineer, Netflix
Minh Do has been working at Netflix for the last several years to run, patch, and troubleshoot Cassandra on both server and client sides, and is also a co-creator of Dynomite project. Prior to Netflix, at Tango, he spearheaded its Big Data pipeline system from the ground using Spark/Hadoop. Before that, at Qualys, he built a distributed queue system that bridges traffics between all major components. He has passion in distributed system, machine learning/deep learning, and data storages.
Take an in-depth look at data warehousing with Amazon Redshift and get answers to your technical questions. We will cover performance tuning techniques that take advantage of Amazon Redshift's columnar technology and massively parallel processing architecture. We will also discuss best practices for migrating from existing data warehouses, optimizing your schema, loading data efficiently, and using work load management and interleaved sorting.
This webinar by Dov Nimratz (Senior Solution Architect, Consultant, GlobalLogic) was delivered at Embedded Community Webinar #1 on July 7, 2020.
Webinar agenda:
- CPU / GPU / TPU architectures
- Historical context
- CPU and their variations
- GPU or gin in a bottle for artificial intelligence tasks
- TPU architecture specialized artificial intelligence accelerator
- What's next in technology
More details and presentation: https://www.globallogic.com/ua/about/events/embedded-community-webinar-1/
Improving Apache Spark by Taking Advantage of Disaggregated ArchitectureDatabricks
Shuffle in Apache Spark is an intermediate phrase redistributing data across computing units, which has one important primitive that the shuffle data is persisted on local disks. This architecture suffers from some scalability and reliability issues. Moreover, the assumptions of collocated storage do not always hold in today's data centers. The hardware trend is moving to disaggregated storage and compute architecture for better cost efficiency and scalability. To address the issues of Spark shuffle and support disaggregated storage and compute architecture, we implemented a new remote Spark shuffle manager. This new architecture writes shuffle data to a remote cluster with different Hadoop-compatible filesystem backends. Firstly, the failure of compute nodes will no longer cause shuffle data recomputation. Spark executors can also be allocated and recycled dynamically which results in better resource utilization. Secondly, for most customers currently running Spark with collocated storage, it is usually challenging for them to upgrade the disks on every node to latest hardware like NVMe SSD and persistent memory because of cost consideration and system compatibility. With this new shuffle manager, they are free to build a separated cluster storing and serving the shuffle data, leveraging the latest hardware to improve the performance and reliability. Thirdly, in HPC world, more customers are trying Spark as their high performance data analytics tools, while storage and compute in HPC clusters are typically disaggregated. This work will make their life easier. In this talk, we will present an overview of the issues of the current Spark shuffle implementation, the design of new remote shuffle manager, and a performance study of the work.
This talk will describe the changes which went into MongoDB 3.0 in order to allow storage engines to achieve their maximum concurrency potential. In MongoDB 3.0, concurrency control has been separated into two levels: top-level, which protects the database catalog, and storage engine-level, which allows each individual storage engine implementation to manage its own concurrency. We will start from the top and introduce the concept of multi-granularity locking and how it protects the database catalog. We will then explain how the MongoDB lock manager works and how it allows storage engines to manage their own concurrency control without imposing any additional overhead.
I promise that understand NoSQL is as easy as playing with LEGO bricks ! The Google Bigtable presented in 2006 is the inspiration for Apache HBase: let's take a deep dive into Bigtable to better understand Hbase.
New Accelerated Compute Infrastructure Solutions from SupermicroRebekah Rodriguez
Join us for a special edition of Supermicro’s TECHTalk as we introduce Supermicro’s new accelerated compute infrastructure solutions. A number of Supermicro experts will share insights and updates on one of the industry’s broadest portfolios of NVIDIA-Certified GPU systems, which deliver new levels of performance for AI infrastructure with the new H100 Tensor Core GPUs.
Memory organization
Memory Organization in Computer Architecture. A memory unit is the collection of storage units or devices together. The memory unit stores the binary information in the form of bits. ... Volatile Memory: This loses its data, when power is switched off.
Linux Memory Management
1.Memory Structure of Linux OS.
2.How Program is loaded into the memory.
3.Address Translation.
4.Feature for Multithreading and Multiprocessing.
The Anatomy Of The Google Architecture Fina Lv1.1Hassy Veldstra
A comprehensive overview of Google's architecture - starting from the search page and all the way to its internal networks.
By Ed Austin, talk given at Edinburgh Techmeetup in December 2009
http://techmeetup.co.uk
Cluster computing is a type of computing where a group of several computers are linked together, allowing the entire group of computers to behave as if it were a single entity. There are a wide variety of different reasons why people might use cluster computing for various computer tasks. It s also used to make sure that a computing system will always be available. It is unknown when this cluster computing concept was first developed, and several different organizations have claimed to have invented it.
This is the presentation on clusters computing which includes information from other sources too including my own research and edition. I hope this will help everyone who required to know on this topic.
Designed by Sanjay Ghemawat , Howard Gobioff and Shun-Tak Leung of Google in 2002-03.
Provides fault tolerance, serving large number of clients with high aggregate performance.
The field of Google is beyond the searching.
Google store the data in more than 15 thousands commodity hardware.
Handles the exceptions of Google and other Google specific challenges in their distributed file system.
Taking High Performance Computing to the Cloud: Windows HPC and Saptak Sen
High Performance Computing (HPC) is expected to be the single largest workload on Windows Azure. This session discusses how Windows HPC Server 2008 R2 SP2 enables our customers to easily run their HPC applications on Windows Azure. It covers different usage scenarios (“bursting” to Windows Azure vs. running everything in Windows Azure),differences between running HPC applications on-premise vs. in Azure,best practices,limitations,etc. Real-world customers and their scenarios are highlighted. The key points are illustrated with live demos of HPC applications running in Windows Azure. This session is a must for everyone who wants to know about HPC and Windows Azure.
By 2020, 50% of all new software will process machine-generated data of some sort (Gartner). Historically, machine data use cases have required non-SQL data stores like Splunk, Elasticsearch, or InfluxDB.
Today, new SQL DB architectures rival the non-SQL solutions in ease of use, scalability, cost, and performance. Please join this webinar for a detailed comparison of machine data management approaches.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
"Impact of front-end architecture on development cost", Viktor TurskyiFwdays
I have heard many times that architecture is not important for the front-end. Also, many times I have seen how developers implement features on the front-end just following the standard rules for a framework and think that this is enough to successfully launch the project, and then the project fails. How to prevent this and what approach to choose? I have launched dozens of complex projects and during the talk we will analyze which approaches have worked for me and which have not.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
4. PageRank PageRankTM is the core technology to measure the importance of a page Google's theory – If page A links to page B # Page B is important # The link text is irrelevant – If many important links point to page A # Links from page A are also important 4
6. Key Design Principles Software reliability Use replication for better request throughput and availability Price/performance beats peak performance Using commodity PCs reduces the cost of computation 6
7. The Power Problem High density of machines (racks) – High power consumption 400-700 W/ft2 # Typical data center provides 70-150 W/ft2 # Energy costs – Heating # Cooling system costs Reducing power – Reduce performance (c/p may not reduce!) – Faster hardware depreciation (cost up!) 7
8. Parallelism Lookup of matching docs in a large index --> many lookups in a set of smaller indexes followed by a merge step A query stream --> multiple streams (each handled by a cluster) Adding machines to a pool increases serving capacity 8
9. Hardware Level Consideration Instruction level parallelism does not help Multiple simple, in-order, short-pipeline core Thread level parallelism Memory system with moderate sized L2 cache is enough Large shared-memory machines are not required to boost the performance 9
10.
11. Data transfers happen directly between clients/chunk servers
13. GFS Usage @ Google • 200+ clusters • Many clusters of 1000s of machines • Pools of 1000s of clients • 4+ PB Filesystems • 40 GB/s read/write load – (in the presence of frequent HW failures) 11
23. Implications of the Computing Environment Stuff Breaks • If you have one server, it may stay up three years (1,000 days) • If you have 10,000 servers, expect to lose ten a day • “Ultra-reliable” hardware doesn’t really help • At large scale, super-fancy reliable hardware still fails, albeit less often – software still needs to be fault-tolerant – commodity machines without fancy hardware give better performance/$ • Reliability has to come from the software • Making it easier to write distributed programs 21
24. Infrastructure for Search Systems Several key pieces of infrastructure: – GFS – MapReduce – BigTable 22
25. MapReduce • A simple programming model that applies to many large-scale computing problems • Hide messy details in MapReduce runtime library: – automatic parallelization – load balancing – network and disk transfer optimizations – handling of machine failures – robustness – improvements to core library benefit all users of library! 23
26. Typical problem solved by MapReduce • Read a lot of data • Map: extract something you care about from each record • Shuffle and Sort • Reduce: aggregate, summarize, filter, or transform • Write the results • Outline stays the same, map and reduce change to fit the problem 24
27. Conclusions For a large scale web service system like Google – Design the algorithm which can be easily parallelized – Design the architecture using replication to achieve distributed computing/storage and fault tolerance – Be aware of the power problem which significantly restricts the use of parallelism 25
28. References 1. Luiz André Barroso , Jeffrey Dean , UrsHölzle, Web Search for a Planet: The Google Cluster Architecture, IEEE Micro, v.23 n.2, p.22-28, March 2003 [doi>10.1109/MM.2003.1196112] 2. S. Brin and L. Page, “The Anatomy of a Large-Scale Hypertextual Web Search Engine,” Proc. Seventh World Wide Web Conf. (WWW7), International World Wide Web Conference Committee (IW3C2), 1998, pp. 107-117. 3. “TPC Benchmark C Full Disclosure Report for IBM eserverxSeries 440 using Microsoft SQL Server 2000 Enterprise Edition and Microsoft Windows .NET Datacenter Server 2003, TPC-C Version 5.0,” http://www.tpc.org/results/FDR/TPCC/ibm.x4408way.c5.fdr.02110801.pdf. 4. D. Marr et al., “Hyper-Threading Technology Architecture and Microarchitecture: A Hypertext History,” Intel Technology J., vol. 6, issue 1, Feb. 2002. 5. L. Hammond, B. Nayfeh, and K. Olukotun, “A Single-Chip Multiprocessor,” Computer, vol. 30, no. 9, Sept. 1997, pp. 79-85. 6. L.A. Barroso et al., “Piranha: A Scalable Architecture Based on Single-Chip Multiprocessing,” Proc. 27th ACM Int’l Symp. Computer Architecture, ACM Press, 2000, pp. 282-293. 7. L.A. Barroso, K. Gharachorloo, and E. Bugnion, “Memory System Characterization of Commercial Workloads,” Proc. 25th ACM Int’l Symp. Computer Architecture, ACM Press, 1998, pp. 3-14. 26