Welcome!

Apache Authors: Pat Romanski, Liz McMillan, Elizabeth White, Christopher Harrold, Janakiram MSV

Blog Feed Post

Getting the maximum performance of your Java processes

therore-concurrent provides self-tuning thread-pools helping you to make the most of your system.

Recently, I have been working in the optimization of an OLTP system. The software has a SEDA architecture (Staged Event Driven Architecture) with lots of threads doing little works. I had to fight with the hard task of adjusting a hundred of parameters. Each of those parameters affected some others and so on.

For example if the number of concurrent database connections is set too low, it would cause a contention in getting connections. On the contrary, if that number is set too high, it could cause a lock-contention in the database when the threads want to access to some shared resources (index, row, block, etc.)

Even more, not always the processing of an event requires the same type of resources. A sudden change in the type of events that are being treated, can turn an optimal configuration into a suboptimal.

One of the most significant parameters is the number of threads assigned for each component. It is difficult to choose a good value if you don’t know how much the threads use each type of resource and how much are they coupled between each other.

Usually certain tasks have a higher priority and should be processed as soon as possible. This further complicates the choice of the configuration. Enforcing priorities and maximizing throughputs are opposite goals therefore it is necessary to define the scope of both.

In my experience a huge configurability can work against you. In a medium/big SOA system with a lot of service communications and complex workload profiles that even change over time, is almost impossible to get the optimal value for each of those parameters. Because of that I found interesting to develop a library that might be able to adapt quickly at runtime in order to make the most of the system.

Self-tuning thread-pool

Nowadays creating threads manually is not very common. Instead of that, thread-pools are frequently used. A thread-pool manages the creation and allocation of threads. JDK comes with some interesting and useful classes for managing threads. I list two of the most important:

  • ThreadPoolExecutor is a very flexible and configurable thread-pool that supports customization of queue size, minimum and maximum pool size, keep-alive time, etc.
  • Executors is a convenient class that creates thread-pools for the most usual cases.

I have developed the library therore-concurrent that takes advantage of those classes and extends some functionalities. The library contains analogous to the above classes.

  • SelfTuningExecutorService is a thread-pool that implements a mechanism for searching a good value for the pool size. The algorithm tries to maximize the throughput respecting the thread-pool priorities.
  • SelfTuningExecutors acts as the factory of SelfTuningExecutorService. It is recommended to use it as a singleton.

The following charts show how quickly SelfTuningExecutorService finds the optimal value.

selftuning_poolsize_executions_chart

Using SelfTuningExecutors directly

  • Add the dependency to the pom
  • <dependency>
        <groupId>net.therore</groupId>
        <artifactId>therore-concurrent</artifactId>
        <version>1.1.0</version>
    </dependency>
    

  • The following snippet shows how can it be used.
  • SelfTuningExecutors executors = SelfTuningExecutors.defaultSelfTuningExecutors();
    ExecutorServicce service = executors.newSelfTuningExecutor("executor-for-test", corePoolSize, initPoolSize
           , maximumPoolSize, priority, queueSize);
    service.execute(task);
    

The only new parameters are initPoolSize and priority.

  • initPoolSize is the initial amount of threads assigned to the pool.
  • priority is a positive number that works for SelfTuningExecutorService to limit the number of threads of this pool regarding others.

Integrating SelfTuningExecutors with Quartz Scheduler

Quartz-Scheduler has his own thread-pool interface and its name is “ThreadPool” (not surprise). The class SelfTuningThreadPool that is in the artifact therore-concurrent-quartz implements such interface. Integrating it is very easy, follow these steps:

  • Add the dependency to the pom
  • <dependency>
        <groupId>net.therore</groupId>
        <artifactId>therore-concurrent-quartz</artifactId>
        <version>1.1.0</version>
    </dependency>
    

  • Change the configuration properties of quartz
  • # org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool
    # org.quartz.threadPool.threadCount = 1
    # org.quartz.threadPool.threadPriority = 5
    org.quartz.threadPool.class = net.therore.concurrent.quartz.SelfTuningThreadPool
    org.quartz.threadPool.corePoolSize = 1
    org.quartz.threadPool.initPoolSize = 1
    org.quartz.threadPool.maximumPoolSize = 100
    org.quartz.threadPool.priority = 5
    org.quartz.threadPool.queueSize = 2
    

Integrating SelfTuningExecutors with Apache Camel

I love Apache Camel. It offers a lot of components supporting integration with different technologies. But if none of them actually help you yet, it’s pretty easy to make your own component.

Camel’s team has thought very well the threading model. They use the concept (and interface) of ThreadPoolProfile which is a kind of thread-pool-template that you can use to instantiate several pools with the same configuration. If that is not enough, you can program your own implementation of ExecutorServiceManager, the Camel’s thread-pool provider. Simplifying, think about it like the Executors class of the JDK.

I’ve just done that, SelfTunigExecutorServiceManager is the name of my own implementation of ExecutorServiceManager. It is located in other maven module therore-concurrent-camel. I’ll explain how to use it.

  • Add the dependency to the pom
  • <dependency>
        <groupId>net.therore</groupId>
        <artifactId>therore-concurrent-camel</artifactId>
        <version>1.1.0</version>
    </dependency>
    

  • The following snippet contains two connected routes with SEDA component and SelfTunigExecutorServiceManager
  • SelfTunigExecutorServiceManager executorManager = new SelfTunigExecutorServiceManager(context);
    context.setExecutorServiceManager(executorManager);
    ThreadPoolProfile profile = new ThreadPoolProfile();
    profile.setId("self-tuning-profile");
    profile.setMaxPoolSize(100);
    profile.setMaxQueueSize(100);
    profile.setDefaultProfile(true);
    executorManager.setDefaultThreadPoolProfile(profile);        
    
    final String sedaEndpointUri = "seda:myseda?blockWhenFull=true&size=1";
    context.addRoutes(new RouteBuilder() {
       @Override
       public void configure() throws Exception {
           from("direct:in")
           .to(sedaEndpointUri);
       }
    });
    context.addRoutes(new RouteBuilder() {
       @Override
       public void configure() throws Exception {
           from(sedaEndpointUri)
           .threads(1, 100)
           .to("bean:mybean");
       }
    });
    
    ProducerTemplate template = context.createProducerTemplate();
    context.start();
    for (int i=0; i<ITERATIONS; i++) {
       template.sendBody("direct:in", "dummy string");
    }
    

Summary

I have figured out that there are many elements that might turn into selftuning ones. I chose ThreadPool because from my point of view is one of the most important, used and easy to test element.

Moreover, most of the modern libraries and frameworks feature different ways to extend their factories, providers and templates. All of that aims to develop general purpose classes and integrate them with lots of frameworks.

Read the original blog entry...

More Stories By Alfredo Diaz

Alfredo Diaz is a Java EE Architect with over 10 years of experience. He is an expert in SOA, real-time processing, scalability and HA. He is an Agile enthusiast.

@ThingsExpo Stories
DX World EXPO, LLC, a Lighthouse Point, Florida-based startup trade show producer and the creator of "DXWorldEXPO® - Digital Transformation Conference & Expo" has announced its executive management team. The team is headed by Levent Selamoglu, who has been named CEO. "Now is the time for a truly global DX event, to bring together the leading minds from the technology world in a conversation about Digital Transformation," he said in making the announcement.
"Space Monkey by Vivent Smart Home is a product that is a distributed cloud-based edge storage network. Vivent Smart Home, our parent company, is a smart home provider that places a lot of hard drives across homes in North America," explained JT Olds, Director of Engineering, and Brandon Crowfeather, Product Manager, at Vivint Smart Home, in this SYS-CON.tv interview at @ThingsExpo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
SYS-CON Events announced today that Conference Guru has been named “Media Sponsor” of the 22nd International Cloud Expo, which will take place on June 5-7, 2018, at the Javits Center in New York, NY. A valuable conference experience generates new contacts, sales leads, potential strategic partners and potential investors; helps gather competitive intelligence and even provides inspiration for new products and services. Conference Guru works with conference organizers to pass great deals to gre...
The Internet of Things will challenge the status quo of how IT and development organizations operate. Or will it? Certainly the fog layer of IoT requires special insights about data ontology, security and transactional integrity. But the developmental challenges are the same: People, Process and Platform. In his session at @ThingsExpo, Craig Sproule, CEO of Metavine, demonstrated how to move beyond today's coding paradigm and shared the must-have mindsets for removing complexity from the develop...
In his Opening Keynote at 21st Cloud Expo, John Considine, General Manager of IBM Cloud Infrastructure, led attendees through the exciting evolution of the cloud. He looked at this major disruption from the perspective of technology, business models, and what this means for enterprises of all sizes. John Considine is General Manager of Cloud Infrastructure Services at IBM. In that role he is responsible for leading IBM’s public cloud infrastructure including strategy, development, and offering m...
"Evatronix provides design services to companies that need to integrate the IoT technology in their products but they don't necessarily have the expertise, knowledge and design team to do so," explained Adam Morawiec, VP of Business Development at Evatronix, in this SYS-CON.tv interview at @ThingsExpo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
To get the most out of their data, successful companies are not focusing on queries and data lakes, they are actively integrating analytics into their operations with a data-first application development approach. Real-time adjustments to improve revenues, reduce costs, or mitigate risk rely on applications that minimize latency on a variety of data sources. In his session at @BigDataExpo, Jack Norris, Senior Vice President, Data and Applications at MapR Technologies, reviewed best practices to ...
Widespread fragmentation is stalling the growth of the IIoT and making it difficult for partners to work together. The number of software platforms, apps, hardware and connectivity standards is creating paralysis among businesses that are afraid of being locked into a solution. EdgeX Foundry is unifying the community around a common IoT edge framework and an ecosystem of interoperable components.
Large industrial manufacturing organizations are adopting the agile principles of cloud software companies. The industrial manufacturing development process has not scaled over time. Now that design CAD teams are geographically distributed, centralizing their work is key. With large multi-gigabyte projects, outdated tools have stifled industrial team agility, time-to-market milestones, and impacted P&L stakeholders.
"Akvelon is a software development company and we also provide consultancy services to folks who are looking to scale or accelerate their engineering roadmaps," explained Jeremiah Mothersell, Marketing Manager at Akvelon, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
"IBM is really all in on blockchain. We take a look at sort of the history of blockchain ledger technologies. It started out with bitcoin, Ethereum, and IBM evaluated these particular blockchain technologies and found they were anonymous and permissionless and that many companies were looking for permissioned blockchain," stated René Bostic, Technical VP of the IBM Cloud Unit in North America, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Conventi...
In his session at 21st Cloud Expo, Carl J. Levine, Senior Technical Evangelist for NS1, will objectively discuss how DNS is used to solve Digital Transformation challenges in large SaaS applications, CDNs, AdTech platforms, and other demanding use cases. Carl J. Levine is the Senior Technical Evangelist for NS1. A veteran of the Internet Infrastructure space, he has over a decade of experience with startups, networking protocols and Internet infrastructure, combined with the unique ability to it...
22nd International Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, and co-located with the 1st DXWorld Expo will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud ...
"Cloud Academy is an enterprise training platform for the cloud, specifically public clouds. We offer guided learning experiences on AWS, Azure, Google Cloud and all the surrounding methodologies and technologies that you need to know and your teams need to know in order to leverage the full benefits of the cloud," explained Alex Brower, VP of Marketing at Cloud Academy, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clar...
Gemini is Yahoo’s native and search advertising platform. To ensure the quality of a complex distributed system that spans multiple products and components and across various desktop websites and mobile app and web experiences – both Yahoo owned and operated and third-party syndication (supply), with complex interaction with more than a billion users and numerous advertisers globally (demand) – it becomes imperative to automate a set of end-to-end tests 24x7 to detect bugs and regression. In th...
"MobiDev is a software development company and we do complex, custom software development for everybody from entrepreneurs to large enterprises," explained Alan Winters, U.S. Head of Business Development at MobiDev, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
Coca-Cola’s Google powered digital signage system lays the groundwork for a more valuable connection between Coke and its customers. Digital signs pair software with high-resolution displays so that a message can be changed instantly based on what the operator wants to communicate or sell. In their Day 3 Keynote at 21st Cloud Expo, Greg Chambers, Global Group Director, Digital Innovation, Coca-Cola, and Vidya Nagarajan, a Senior Product Manager at Google, discussed how from store operations and ...
"There's plenty of bandwidth out there but it's never in the right place. So what Cedexis does is uses data to work out the best pathways to get data from the origin to the person who wants to get it," explained Simon Jones, Evangelist and Head of Marketing at Cedexis, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
SYS-CON Events announced today that CrowdReviews.com has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5–7, 2018, at the Javits Center in New York City, NY. CrowdReviews.com is a transparent online platform for determining which products and services are the best based on the opinion of the crowd. The crowd consists of Internet users that have experienced products and services first-hand and have an interest in letting other potential buye...
SYS-CON Events announced today that Telecom Reseller has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5-7, 2018, at the Javits Center in New York, NY. Telecom Reseller reports on Unified Communications, UCaaS, BPaaS for enterprise and SMBs. They report extensively on both customer premises based solutions such as IP-PBX as well as cloud based and hosted platforms.