From the Blogosphere
Java Heap Space vs. Stack Memory | @CloudExpo #JVM #JRE #Java #AI #DX
Stack and heap are two ways Java allocates memory. Understanding when and how they work is critical
By: Stackify Blog
Nov. 15, 2017 11:00 AM
Java Heap Space vs. Stack Memory: How Java Applications Allocate Memory
Java applications need a certain amount of RAM on a computer to run. Each time an object or variable is declared, it needs more RAM. Simply designating enough memory to hold every value declared and run each method would lead to a bloated application.
To keep application memory requirements lean, it is partitioned in ways that require less memory and allows the application to run more quickly.
The Java Virtual Machine (JVM) divides memory between Java Heap Space and Java Stack Memory in a way that only uses memory that's needed.
What Is Java Heap Space
When an object is created, it is always created in Heap and has global access. That means all objects can be referenced from anywhere in the application.
It is managed by two concepts: Garbage collection and young-generation, old-generation.
Garbage collection works to free memory by clearing any by objects without any references in the methods. These are objects that are no longer being used. Clearing them ensures they don't take up space in the Heap.
Young-generation, old-generation helps prioritize objects for garbage collection by dividing Java Heap Space into two generations.
The nursery is the younger generation where the new objects are stored. When the nursery is full, garbage collection cleans it out. Note only the memory space for the nursery is full. There is still memory in the old generation.
The old generation is home to objects have been around long enough. When the old generation runs out of room, garbage collection removes the objects not being used in the old space. Again, only part of the Heap is full when old garbage collection happens. There is still room in the nursery.
What Is Java Stack Memory?
When a new method is invoked, a new block of memory will be created in the Stack. This new block will store the temporary values invoked by the method and references to objects stored in the Heap that are being used by the method.
Any values in this block are only accessible by the current method and will not exist once it ends.
When the method ends, that block will be erased. The next method invoked will use that empty block.
This "last in, first out" method makes it easy to find the values needed and allows fast access to those values.
How They're Used in a Java Application
In the above example from JournalDev.com, the use of Stack and Heap is explained as follows:
Additional Resources and Tutorials
To learn more, check out the following resources:
Stack and heap are two ways Java allocates memory. Understanding when and how they work is critical for developing better Java programs.
The post Java Heap Space vs. Stack Memory: How Java Applications Allocate Memory appeared first on Stackify.
Download Show Prospectus ▸ Here
DevOps at Cloud Expo taking place October 31 - November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA, will feature technical sessions from a rock star conference faculty and the leading industry players in the world.
Must Watch Video: Recap of @DevOpsSummit New York Javits Center
The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long development cycles that produce software that is obsolete at launch. DevOps may be disruptive, but it is essential.
Nutanix DevOps Booth at @DevOpsSummit New York Javits Center
DevOps at Cloud Expo will expand the DevOps community, enable a wide sharing of knowledge, and educate delegates and technology providers alike. Recent research has shown that DevOps dramatically reduces development time, the amount of enterprise IT professionals put out fires, and support time generally. Time spent on infrastructure development is significantly increased, and DevOps practitioners report more software releases and higher quality. Sponsors of DevOps at Cloud Expo will benefit from unmatched branding, profile building and lead generation opportunities through:
For more information on sponsorship, exhibit, and keynote opportunities, contact Carmen Gonzalez by email at events (at) sys-con.com, or by phone 201 802-3021.
Most Popular Video: Sheng Liang's Containers Talk
@DevOpsSummit at Cloud Expo taking place October 31 - November 2, 2017, Santa Clara Convention Center, CA, and is co-located with the 21st International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world.
@DevOpsSummit 2017 Silicon Valley
@DevOpsSummit 2018 New York
With major technology companies and startups seriously embracing Cloud strategies, now is the perfect time to attend 21st Cloud Expo, October 31 - November 2, 2017, at the Santa Clara Convention Center, CA, and June 12-14, 2018, at the Javits Center in New York City, NY, and learn what is going on, contribute to the discussions, and ensure that your enterprise is on the right path to Digital Transformation.
Track 1. Enterprise Cloud | Cloud-Native
The upcoming 21st International @CloudExpo | @ThingsExpo, October 31 - November 2, 2017, Santa Clara Convention Center, CA, and June 12-14, 2018, at the Javits Center in New York City, NY announces that its Call For Papers for speaking opportunities is open. Themes and topics to be discussed include:
Submit your speaking proposal today! ▸ Here
Cloud Expo | @ThingsExpo 2017 Silicon Valley
Cloud Expo | @ThingsExpo 2018 New York
Download Show Prospectus ▸ Here
Every Global 2000 enterprise in the world is now integrating cloud computing in some form into its IT development and operations. Midsize and small businesses are also migrating to the cloud in increasing numbers.
Cloud Expo is the single show where technology buyers and vendors can meet to experience and discus cloud computing and all that it entails. Sponsors of Cloud Expo will benefit from unmatched branding, profile building and lead generation opportunities through:
The World's Largest "Cloud Digital Transformation" Event
@CloudExpo | @ThingsExpo 2017 Silicon Valley
@CloudExpo | @ThingsExpo 2018 New York
Full Conference Registration Gold Pass and Exhibit Hall ▸ Here
Register For @CloudExpo ▸ Here via EventBrite
Register For @ThingsExpo ▸ Here via EventBrite
Register For @DevOpsSummit ▸ Here via EventBrite
Sponsors of Cloud Expo | @ThingsExpo will benefit from unmatched branding, profile building and lead generation opportunities through:
For more information on sponsorship, exhibit, and keynote opportunities, contact Carmen Gonzalez (@GonzalezCarmen) today by email at events (at) sys-con.com, or by phone 201 802-3021.
With major technology companies and startups seriously embracing Cloud strategies, now is the perfect time to attend @CloudExpo | @ThingsExpo, October 31 - November 2, 2017, at the Santa Clara Convention Center, CA, and June 12-4, 2018, at the Javits Center in New York City, NY, and learn what is going on, contribute to the discussions, and ensure that your enterprise is on the right path to Digital Transformation.
Delegates to Cloud Expo | @ThingsExpo will be able to attend 8 simultaneous, information-packed education tracks.
There are over 120 breakout sessions in all, with Keynotes, General Sessions, and Power Panels adding to three days of incredibly rich presentations and content.
Join Cloud Expo | @ThingsExpo conference chair Roger Strukhoff (@IoT2040), October 31 - November 2, 2017, Santa Clara Convention Center, CA, and June 12-14, 2018, at the Javits Center in New York City, NY, for three days of intense Enterprise Cloud and 'Digital Transformation' discussion and focus, including Big Data's indispensable role in IoT, Smart Grids and (IIoT) Industrial Internet of Things, Wearables and Consumer IoT, as well as (new) Digital Transformation in Vertical Markets.
Financial Technology - or FinTech - Is Now Part of the @CloudExpo Program!
Accordingly, attendees at the upcoming 21st Cloud Expo | @ThingsExpo October 31 - November 2, 2017, Santa Clara Convention Center, CA, and June 12-14, 2018, at the Javits Center in New York City, NY, will find fresh new content in a new track called FinTech, which will incorporate machine learning, artificial intelligence, deep learning, and blockchain into one track.
Financial enterprises in New York City, London, Singapore, and other world financial capitals are embracing a new generation of smart, automated FinTech that eliminates many cumbersome, slow, and expensive intermediate processes from their businesses.
FinTech brings efficiency as well as the ability to deliver new services and a much improved customer experience throughout the global financial services industry. FinTech is a natural fit with cloud computing, as new services are quickly developed, deployed, and scaled on public, private, and hybrid clouds.
More than US$20 billion in venture capital is being invested in FinTech this year. @CloudExpo is pleased to bring you the latest FinTech developments as an integral part of our program, starting at the 21st International Cloud Expo October 31 - November 2, 2017 in Silicon Valley, and June 12-14, 2018, in New York City.
About SYS-CON Media & Events
SYS-CON Media (www.sys-con.com) has since 1994 been connecting technology companies and customers through a comprehensive content stream - featuring over forty focused subject areas, from Cloud Computing to Web Security - interwoven with market-leading full-scale conferences produced by SYS-CON Events. The company's internationally recognized brands include among others Cloud Expo® (@CloudExpo), Big Data Expo® (@BigDataExpo), DevOps Summit (@DevOpsSummit), @ThingsExpo® (@ThingsExpo), Containers Expo (@ContainersExpo) and Microservices Expo (@MicroservicesE).
Cloud Expo®, Big Data Expo® and @ThingsExpo® are registered trademarks of Cloud Expo, Inc., a SYS-CON Events company.
Latest AJAXWorld RIA Stories
Subscribe to the World's Most Powerful Newsletters
Subscribe to Our Rss Feeds & Get Your SYS-CON News Live!
SYS-CON Featured Whitepapers
Most Read This Week