1. What does millions visits means?
2. How to know the problem? Tools?
3. Steps for emergency repair
4. The real problem is “Socket”
5. Profiling with XHProf
6. Cachings and twemproxy
7. Summarize of skills
Building a server to manage high concurrent connections is non-trival task. For those developers that use ActionScript 3 to build games on the client side it means having a totally different skillset. Being able to use ActionScript 3 on the server to build MMO’s or port client code to the server allows developers to leverage their skills on the server.
By walking through a live game example with more then 15,000 concurrent connections running on a medium Amazon EC2 server the presentation will:
1. Introduce Linux server configuration for high concurrent connected usage.
2. Introduce Socket class based on libev library for high concurrent connection.
3. Introduce leveraging Tamarin project for ActionScript 3 on the server.
In the last year, we've gone from millions of pieces of data to billions of pieces of data. I will speak on a solution for scaling up and about the challenges presented. Also covered will be the future of data at Qihoo 360 with MongoDB.
SKF reported strong financial results for the first quarter of 2010, with operating margin of 11.8% compared to 5.2% in the first quarter of 2009. Demand increased across most regions and industries, particularly in Asia and for the automotive business. For the second quarter, SKF expects demand to be significantly higher than the previous year and slightly higher than the first quarter. SKF will maintain higher manufacturing levels to meet demand.
The document summarizes an economics group presentation on the United States market situation following the 2008 financial crisis. It discusses the recession, impact on unemployment and homelessness. It then covers the subprime mortgage crisis and resulting property market downturn, as well as issues faced by the automotive and financial industries that required government intervention.
Building a server to manage high concurrent connections is non-trival task. For those developers that use ActionScript 3 to build games on the client side it means having a totally different skillset. Being able to use ActionScript 3 on the server to build MMO’s or port client code to the server allows developers to leverage their skills on the server.
By walking through a live game example with more then 15,000 concurrent connections running on a medium Amazon EC2 server the presentation will:
1. Introduce Linux server configuration for high concurrent connected usage.
2. Introduce Socket class based on libev library for high concurrent connection.
3. Introduce leveraging Tamarin project for ActionScript 3 on the server.
In the last year, we've gone from millions of pieces of data to billions of pieces of data. I will speak on a solution for scaling up and about the challenges presented. Also covered will be the future of data at Qihoo 360 with MongoDB.
SKF reported strong financial results for the first quarter of 2010, with operating margin of 11.8% compared to 5.2% in the first quarter of 2009. Demand increased across most regions and industries, particularly in Asia and for the automotive business. For the second quarter, SKF expects demand to be significantly higher than the previous year and slightly higher than the first quarter. SKF will maintain higher manufacturing levels to meet demand.
The document summarizes an economics group presentation on the United States market situation following the 2008 financial crisis. It discusses the recession, impact on unemployment and homelessness. It then covers the subprime mortgage crisis and resulting property market downturn, as well as issues faced by the automotive and financial industries that required government intervention.
The Texas Wildlife Rehabilitation Coalition (TWRC) is a nonprofit founded in 1979 that operates the first wildlife emergency center in Houston. The TWRC evaluates and treats about 5,000 animals per year, including nearly 2,000 baby birds each spring and summer. Run by over 400 members and volunteers, the TWRC operates on-site and off-site rehabilitation and education programs from its location near I-10W and Beltway 8 in Houston.
This document discusses the environmental issues with plastic water bottles and proposes solutions. It notes that producing plastic water bottles requires significant energy and produces carbon dioxide. It then suggests redesigning water bottles to use less plastic, passing laws requiring less plastic usage, and incentivizing the use of reusable canteens by adding filtered water taps to vending machines so people can refill canteens for less money than buying bottled drinks. The goal is to greatly reduce unsustainable plastic bottle usage.
Physics is the natural science that studies matter, energy, and their interaction. It seeks to explain natural phenomena through experimentation and observation. The main branches of physics include mechanics, acoustics, electromagnetism, optics, nuclear physics, and thermodynamics, each focusing on a different type of energy or physical phenomenon.
The document discusses the coming "big data tsunami" and how organizations need to prepare. It notes that enterprises are drowning in data but lack confidence in decisions based on their data. It recommends three steps to prepare: 1) assess existing data quality, 2) implement incremental corrections, and 3) lead the organization to be prepared to benefit from big data. Key sectors that will be impacted include retail, healthcare, manufacturing, and education. The document encourages organizations not to drown but to prepare to ride and benefit from the big data wave.
The document summarizes SKF Group's first quarter 2010 results. Key points include strong operating profit and margin compared to the previous year. Production levels and demand outlook increased during the quarter, though sales were negatively impacted by price and mix factors. The company inaugurated two new factories in India and adjusted manufacturing capacity in Sweden. Guidance for Q2 2010 indicated further sales growth compared to Q1 2010 across regions and divisions.
The document discusses supply chain management and supply chain planning. It defines supply chain management and explains why it is important for strategic advantage and to address globalization. It then describes supply chain planning processes like demand planning and production planning. Finally, it outlines various models used for supply chain modeling, including forecasting models, location models, distribution network design models, inventory models, and scheduling models.
The document analyzes and compares three carbon footprint calculators from the EPA, Berkeley CoolClimate, and the Nature Conservancy. It finds that the Berkeley calculator estimates the largest footprint while the EPA estimates the smallest. The Nature Conservancy calculator is the most user-friendly. All three consider factors like location, vehicle use, and household size but some generalize more than others. Designers need to consider their specific audience and no single calculator can be perfect.
La Unión Europea ha acordado un paquete de sanciones contra Rusia por su invasión de Ucrania. Las sanciones incluyen restricciones a las transacciones con bancos rusos clave y la prohibición de la venta de aviones y equipos a Rusia. Los líderes de la UE esperan que las sanciones aumenten la presión económica sobre Rusia y la disuadan de continuar su agresión contra Ucrania.
Mutsumi Ota is the co-founder and CEO of giftee, a platform that allows users to send microgifts to friends on social media as a way to celebrate occasions like birthdays in a casual manner. Over 200,000 tweets per day include the word "birthday" and giftee sees an opportunity to provide a way to send gifts without needing to know shipping addresses or deal with high shipping costs for small gifts. Giftee offers both real gifts that can be picked up or redeemed online and virtual gifts that are sent directly to social media accounts.
Archives Of Agronomy Soil Science (49) 333 345Turlough Guerin
This document summarizes a survey of yield differences between transgenic and non-transgenic crops. The survey found no clear evidence that genetically modified (GM) crops yield more than conventionally bred crops. Additionally, there were no valid comparative trials of yield. The document then discusses GM crop technology and conventional plant breeding methods, highlighting the importance of hybrid vigor and environmental factors for plant breeding. Conventional breeding aims to combine desirable genes from two parents to produce hybrid crops with increased yields, while GM crops contain foreign genes inserted from other organisms.
Magic is logic others would fail to understand> We look at \'successful people\' and say "how lucky!" They were not lucky. They put Labour Under Correct Knowledge and created LUCK. This presentation was made to create awareness amongst a group on 8 habits of whiners and 4 habits of winners. Those from subcontinent would love the mnemonics of 8 habits :-) "Goli hai!"
The document discusses typing using the bottom row keys on a keyboard. It explains that the bottom row keys are Z X C V B N M and that fingers curl down from the home row keys of ASDF and JKL to press these letters. The right hand fingers rest on JKL but curl down to press the keys for N M , . / while typing. It encourages practicing typing with the bottom row keys.
This document discusses VoIP and predictive dialers. It begins with an introduction to VoIP, how it works, and some challenges. It then discusses features of VoIP like making calls anywhere in the world. Predictive dialers are then introduced as widely used in call centers to automatically dial batches of phone numbers for agents. The document explains how predictive dialers work by dialing ahead of available agents to increase productivity by 200-300% compared to manual dialing.
Identifying Tumor Permeability Heterogeneity with MRI Contrast AgentsMike Aref
We tested the hypothesis that macromolecular agents will have a greater sensitivity in identifying areas of high regional mammary tumor permeability-surface area products than low molecular weight agents. New modalities such as ultrasound, MRI, and nuclear medicine may improve breast cancer diagnosis(1). MRI can detect small tumors, 1 mm, with nearly 100% sensitivity(2) and can differentiate benign from malignant tumors with an accuracy of only 30 to 40%(3). A need exists for more accurately characterizing tumor specificity with MR mammography. Dynamic contrast enhanced MR mammography shows promise, and is based on differences in capillary density. Only a subset of tumor cells acquire angiogenic activity and this results in heterogeneous capillary density and surface area(4). High regional capillary density indicates poor prognosis(5). Tumor secreted factors induce angiogenesis, including vascular endothelial growth factor (VEGF), which is necessary for metastasis and regions high in VEGF exhibit hyperpermeability(6). Some of the physiological byproducts of angiogenesis regulate the extraction of an agent by a tumor from the blood. This extraction depends on (a) capillary surface area, S, (b) capillary permeability, P, (c) capillary blood flow, F, (d) transit time of the agent through the tumor interstitium, and (e) the plasma half-life, T1/2 DIST(7, 8). By imaging the time evolution of a contrast agent in the lesion, one can model agent extraction. Knowing the plasma half-life of an agent and regional blood flow provides a measure of the capillary surface area and permeability. Such knowledge may provide a means of differentiating benign from malignant tumors.
This document discusses three types of symmetry: reflection, rotational, and translational. Reflection symmetry is when an image looks identical when reflected across an axis, like in a mirror. Rotational symmetry is when an object appears the same after being rotated around a center point by a certain degree. Translational symmetry involves replicating a basic shape by translating it across a surface in a repeating pattern.
This document discusses load balancing with LVS (Linux Virtual Server) and troubleshooting TCP/IP issues. It includes log output showing LVS routing requests to backends, configuration for routing with IPVSADM and Nginx, and recommendations for disabling LRO/GRO features and adjusting TCP settings to address retransmission issues. Commands like tcpdump, netstat, and ethtool are referenced for analyzing network traffic and interface settings.
This document provides 40 shortcuts for Xcode 6.x. Some of the most commonly used shortcuts include Command + N to create new files, Command + O to open files, Command + Click to go to definitions, Command + F to find in files, Command + B to build projects, and Command + R to build and run projects. The document encourages practicing these shortcuts to improve efficiency when coding in Xcode.
1. What web caching means and includes
2. Why use caching
3. File caching
4. Share caching
5. Local caching
6. Memcached and its usage
7. TTServer and KTServer
8. Redis VS SSDB
9. CDN cachings
10. Twemproxy
11. Programming skills and tips
1. Introduction to Lua and it's features
2. OpenResty: full-fledged web application server
3. Installation and "Hello World"
4. Nonblocking
5. Reconstruction of infov
6. Configuration skills
7. Table and JSON output problem
8. DNS and Hosts parser
9. More features
1. Comment: the UGC system
2. Pages/Channels that use the comment system
3. The architecture
4. The APIs and Entries
5. MongoDB and ObjectId
6. Comments "Gailou"
7. Indexes of the big tables
1. A brief introduction of Git (SVN, CVCS, DVCS etc.)
2. Git/TortoiseGit/msysgit installations
3. A complete guide of Git operations
4. The Branches and HEAD
5. Remote and local repository
6. Rebase and submodules etc.
7. Some Skills and Experience
PHP Coding Standard and 50+ Programming SkillsHo Kim
1. How and Why to write good code?
2. Coding standard based on ZendFramework and real world practise.
3. PHP programming skills from daily coding.
4. Some security tips
5. Some optimization tips