Memcached is a high-performance, distributed memory caching system that is used to speed up dynamic web applications by caching objects in memory to reduce database load. It works by storing objects in memory to allow for fast retrieval, improving response times significantly. Major companies that use memcached include Facebook, Yahoo, Amazon, and LiveJournal. It provides features like consistent hashing for object distribution, multithreading, and replication.
Introduction to memcached, a caching service designed for optimizing performance and scaling in the web stack, seen from perspective of MySQL/PHP users. Given for 2nd year students of professional bachelor in ICT at Kaho St. Lieven, Gent.
moxi is a memcached proxy with several features which can help keep the memcached contract whole in complicated environments. It also brings several optimizations to memcached deployments, without requiring any changes to the application software using memcached. For more, visit: http://labs.northscale.com/moxi/
Today's high-traffic web sites must implement performance-boosting measures that reduce data processing and reduce load on the database, while increasing the speed of content delivery. One such method is the use of a cache to temporarily store whole pages, database recordsets, large objects, and sessions. While many caching mechanisms exist, memcached provides one of the fastest and easiest-to-use caching servers. Coupling memcached with the alternative PHP cache (APC) can greatly improve performance by reducing data processing time. In this talk, Ben Ramsey covers memcached and the pecl/memcached and pecl/apc extensions for PHP, exploring caching strategies, a variety of configuration options to fine-tune your caching solution, and discusses when it may be appropriate to use memcached vs. APC to cache objects or data.
Introduction to memcached, a caching service designed for optimizing performance and scaling in the web stack, seen from perspective of MySQL/PHP users. Given for 2nd year students of professional bachelor in ICT at Kaho St. Lieven, Gent.
moxi is a memcached proxy with several features which can help keep the memcached contract whole in complicated environments. It also brings several optimizations to memcached deployments, without requiring any changes to the application software using memcached. For more, visit: http://labs.northscale.com/moxi/
Today's high-traffic web sites must implement performance-boosting measures that reduce data processing and reduce load on the database, while increasing the speed of content delivery. One such method is the use of a cache to temporarily store whole pages, database recordsets, large objects, and sessions. While many caching mechanisms exist, memcached provides one of the fastest and easiest-to-use caching servers. Coupling memcached with the alternative PHP cache (APC) can greatly improve performance by reducing data processing time. In this talk, Ben Ramsey covers memcached and the pecl/memcached and pecl/apc extensions for PHP, exploring caching strategies, a variety of configuration options to fine-tune your caching solution, and discusses when it may be appropriate to use memcached vs. APC to cache objects or data.
Memcache is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.
A brief overview of caching mechanisms in a web application. Taking a look at the different layers of caching and how to utilize them in a PHP code base. We also compare Redis and MemCached discussing their advantages and disadvantages.
Memcached: What is it and what does it do?Brian Moon
Memcached has become the de facto standard for caching web applications. But, many users jump in feet first without understanding what it does or perhaps more importantly what it does not do. Once you understand memcached, you may come to realize that it is what it does not do that makes it so good.
Memcached is a distributed memory based caching system. But, what does that mean for you? This session will cover the basics of memcached. What are all the components needed? Where is your data cached? What happens when there is a system failure? Is my data stored in more than one place? How do I know what is in my cache? All these questions and more will be answered.
Content caching is one of the most effective ways to dramatically improve the performance of a web site. In this webinar, we’ll deep-dive into NGINX’s caching abilities and investigate the architecture used, debugging techniques and advanced configuration. By the end of the webinar, you’ll be well equipped to configure NGINX to cache content exactly as you need.
View full webinar on demand at http://nginx.com/resources/webinars/content-caching-nginx/
Behind the Scenes at LiveJournal: Scaling StorytimeSergeyChernyshev
Brad talks about clustering setups using MySQL and DRDB and their Open Source software most of which he wrote initially and continues to develop.
A lot of these techniques and/or software is used by many other companies as well - among them Flickr/Yahoo! and Facebook.
Memcache is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.
A brief overview of caching mechanisms in a web application. Taking a look at the different layers of caching and how to utilize them in a PHP code base. We also compare Redis and MemCached discussing their advantages and disadvantages.
Memcached: What is it and what does it do?Brian Moon
Memcached has become the de facto standard for caching web applications. But, many users jump in feet first without understanding what it does or perhaps more importantly what it does not do. Once you understand memcached, you may come to realize that it is what it does not do that makes it so good.
Memcached is a distributed memory based caching system. But, what does that mean for you? This session will cover the basics of memcached. What are all the components needed? Where is your data cached? What happens when there is a system failure? Is my data stored in more than one place? How do I know what is in my cache? All these questions and more will be answered.
Content caching is one of the most effective ways to dramatically improve the performance of a web site. In this webinar, we’ll deep-dive into NGINX’s caching abilities and investigate the architecture used, debugging techniques and advanced configuration. By the end of the webinar, you’ll be well equipped to configure NGINX to cache content exactly as you need.
View full webinar on demand at http://nginx.com/resources/webinars/content-caching-nginx/
Behind the Scenes at LiveJournal: Scaling StorytimeSergeyChernyshev
Brad talks about clustering setups using MySQL and DRDB and their Open Source software most of which he wrote initially and continues to develop.
A lot of these techniques and/or software is used by many other companies as well - among them Flickr/Yahoo! and Facebook.
Implementing High Availability Caching with MemcachedGear6
Typical Memcached deployments do not comprehensively address web site requirements for high availability. Depending on your web architecture, a single failure can disable your web caches. This presentation offers real world solutions to solving <a>high availability</a> challenges common to large, dynamic websites with Memcached, specifically:
* Options and benefits for deploying high availability services within Memcached
* How companies are approaching high availability
* Considerations on building and deploying high availability
o Recommendations for a typical Memcached environment
o Open source tools available
o High level costs for deployment
Caching and tuning fun for high scalability @ FOSDEM 2012Wim Godden
Caching has been a 'hot' topic for a few years. But caching takes more than merely taking data and putting it in a cache : the right caching techniques can improve performance and reduce load significantly. But we'll also look at some major pitfalls, showing that caching the wrong way can bring down your site. If you're looking for a clear explanation about various caching techniques and tools like Memcached, Nginx and Varnish, as well as ways to deploy them in an efficient way, this talk is for you.
Caching and tuning fun for high scalabilityWim Godden
Caching has been a 'hot' topic for a few years. But caching takes more than merely taking data and putting it in a cache : the right caching techniques can improve performance and reduce load significantly. But we'll also look at some major pitfalls, showing that caching the wrong way can bring down your site. If you're looking for a clear explanation about various caching techniques and tools like Memcached, Nginx and Varnish, as well as ways to deploy them in an efficient way, this talk is for you.
Given at zendcon 2008 - my very first conference talk. And I did it way too fast. A lot of the information about these extensions is surprisingly relevant.
Caching and tuning fun for high scalabilityWim Godden
Caching has been a 'hot' topic for a few years. But caching takes more than merely taking data and putting it in a cache : the right caching techniques can improve performance and reduce load significantly. But we'll also look at some major pitfalls, showing that caching the wrong way can bring down your site.
If you're looking for a clear explanation about various caching techniques and tools like Memcached, Nginx and Varnish, as well as ways to deploy them in an efficient way, this talk is for you.
PECL Picks - Extensions to make your life betterZendCon
One of the biggest strengths of PHP is its "glue" power. Take any C library and with a little magic and a compiler you have a fantastic extension. These extensions hide in PECL, but few people can tell the good from the unmaintained or just plain broken. Find the best extensions for your project, learn about PECL, and find out how to become a part of the PECL developer community.
Caching and tuning fun for high scalabilityWim Godden
Caching has been a 'hot' topic for a few years. But caching takes more than merely taking data and putting it in a cache : the right caching techniques can improve performance and reduce load significantly. But we'll also look at some major pitfalls, showing that caching the wrong way can bring down your site. If you're looking for a clear explanation about various caching techniques and tools like Memcached, Nginx and Varnish, as well as ways to deploy them in an efficient way, this talk is for you.
Quick, what do memcache, MogileFS, and Gearman have in common? They are scalable, distributed technologies, and they can also interface with PHP, your ubiquitous web development language. Digg uses all 3 (and a few more) in its quest for social news domination, and this presentation shares what we’ve learned about them and how they are best utilized with PHP.
Caching and tuning fun for high scalability @ PHPTourWim Godden
Caching has been a 'hot' topic for a few years. But caching takes more than merely taking data and putting it in a cache : the right caching techniques can improve performance and reduce load significantly. But we'll also look at some major pitfalls, showing that caching the wrong way can bring down your site. If you're looking for a clear explanation about various caching techniques and tools like Memcached, Nginx and Varnish, as well as ways to deploy them in an efficient way, this talk is for you. In this tutorial, we'll start from a Zend Framework based site. We'll add caching, begin to add servers and replace the standard LAMP stack, all while performing live benchmarks.
Salesforce at Stacki Atlanta Meetup February 2016StackIQ
Dave Peterson's presentation on how Salesforce uses Stacki and Chef to provision and manage thousands of servers. Stacki Atlanta kickoff Meetup on 2/23/16 at the Microsoft Innovation Center. Dave is a Lead Systems Engineer at Salesforce.
Going from zero to Puppet by Pedro Pessoa, Operations Engineer at Server Density.
Abstract: Using out-of-the-box Puppet for non-sysadmin work - steps from going from no config management to managing 100 nodes and allowing non-sysadmin tasks to be performed.
Speaker Bio: Linux admin for 10+ years. Java/Python/C developer 12+ years. Ops engineer at http://www.serverdensity.com - a hosted server and website monitoring service. Currently processing 12TB+ per month into MongoDB running on dedicated and virtual instances.
www.serverdensity.com/puppetcamp/
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
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
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.
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.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
Communications Mining Series - Zero to Hero - Session 1DianaGray10
This session provides introduction to UiPath Communication Mining, importance and platform overview. You will acquire a good understand of the phases in Communication Mining as we go over the platform with you. Topics covered:
• Communication Mining Overview
• Why is it important?
• How can it help today’s business and the benefits
• Phases in Communication Mining
• Demo on Platform overview
• Q/A
Unlocking Productivity: Leveraging the Potential of Copilot in Microsoft 365, a presentation by Christoforos Vlachos, Senior Solutions Manager – Modern Workplace, Uni Systems
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
2. memcached is a high-performance, distributed memory object
caching system, generic in nature, but intended for use in
speeding up dynamic web applications by alleviating
database load.
21. # Set up client object
require 'memcache'
servers = ['127.0.0.1:43042', '127.0.0.1:43043']
CACHE = MemCache.new(servers, :namespace => 'my_app')
22. # Get; fall through to Rails' MySQL load if missing
key = quot;recent_postsquot;
# Try to get; returns nil on failure
posts = CACHE.get(key)
unless posts
# Load from DB
posts = Post.find(:all, :limit => 10, :order => 'id DESC')
# Cache the new value, which is automatically serialized
CACHE.set(key), posts, 60
end
23. # Ghetto locking implementation for memcache-client
# from http://fauna.rubyforge.org/svn/interlock/trunk/lib/interlock/lock.rb
def lock(key, lock_expiry = 30, retries = 5)
retries.times do |count|
# Try to acquire the lock
response = CACHE.add(quot;lock:#{key}quot;, quot;Locked by #{Process.pid}quot;, lock_expiry)
if response == quot;STOREDrnquot;
# We got it
begin
# Yield the current value to the closure
value = yield(CACHE.get(key))
# Set the new value returned from the closure CACHE.set(key, value)
# We're done ('ensure' block will still run)
return value
ensure
# Release the lock
CACHE.delete(quot;lock:#{key}quot;)
end
else
# Exponentially back off requests if the lock can't be acquired
sleep((2**count) / 2.0)
end
end
# We waited and waited but our turn never came
raise MemCacheError, quot;Couldn't acquire lock for #{key}quot;
end
25. sub get_foo_object {
my $foo_id = int(shift);
my $obj = FooClass::MemCache->get(quot;foo:$foo_idquot;);
return $obj if $obj;
$obj = FooClass::db->selectrow_hashref(quot;SELECT .... FROM foo f, bar b quot;.
quot;WHERE ... AND f.fooid=$foo_idquot;);
FooClass::MemCache->set(quot;foo:$foo_idquot;, $obj);
return $obj;
}
27. /**
* Initalize Memcache object and add local server 127.0.0.1 using port 11211
*/
$cache = new Memcache;
$cache->addServer(quot;127.0.0.1quot;,11211);
28. /** Look in cache, if not found, set object (misses null) **/
if (!$user = $cache->get($user_key)) {
/**
* Set object with expire of 1 hour and no compression
*/
$cache->set($user_key,$value,NULL, $expire);
$user = $value;
}
29. /* Get user counter value (does not handle add fail) */
if (!$counter = $cache->get($counter_key)) {
/* No counter, set to 1 */
$cache->add($counter_key,1);
} else {
/* Increment by 1 */
$cache->increment($counter_key);
}
30. /* Print out stats from memcached server */
print_r($cache->getStats());
/* Print out extended stats from memcached server */
print_r($cache->getExtendedStats());
/* Flush memcached (bad idea in production)*/
var_dump($cache->flush());
42. NGINX
• Support variable Time outs
• Based on Perl
• http://wiki.codemongers.com/
NginxHttpMemcachedModule
• http://www.igvita.com/2008/02/11/nginx-
and-memcached-a-400-boost/
49. Trigger
DROP TRIGGER IF EXISTS feed_insert;
CREATE TRIGGER feed_insert BEFORE INSERT ON feeds FOR EACH ROW
BEGIN SET @mm= memc_set(concat('feeds:',md5(NEW.url)),
NEW.url);END |
insert into feeds (url) values ('http://grazr.com/feedlist.xml');
select memc_get(concat('feeds:', md5('http://grazr.com/feedlist.xml')));
+------------------------------------------------------------------+|
memc_get(concat('feeds:', md5('http://grazr.com/feedlist.xml'))) |
+------------------------------------------------------------------+|
http://grazr.com/feedlist.xml |
+------------------------------------------------------------------+
50. Memcached Replication
via MySQL
INSERT INTO table_a VALUES (“key”, “value”, “values”);
INSERT INTO blackhole_table VALUES (memc_delete(“key”));
52. Limits
• Key Size (250 bytes)
• Data Size (under 1 megabyte)
• 32bit/64bit (maximum size of the process)
• Maxbytes (limits item cache, not everything!)
53. LRU
• Least recently accessed items are up for
eviction and can be seen
• One LRU exists per “slab class”
• LRU evictions don't need to be common
54. Threads
• You might not need them (yet!)
• Great for large instances (16G+)
• Also great for large multiget requests
• Scales okay now. Will get better in the
future
55. Slab Allocator
• Memory permanently allocated from OS
• Classes created by chunk size
• Cannot (presently) reassign slab pages
• Carefully use 'stats sizes' to test efficiency
66. 1.2.5 Release
• Multi Interface Support
• UDP all the time
• noreply (SET with no response)
• Solaris Support (large memory page
support)
• getimeofday() optimizations
• IPV6