GARBAGE COLLECTOR Automatic garbage collection is the process of looking at heap memory, identifying which objects are in use and which are not, and deleting the unused objects. An in use object, or a referenced object, means that some part of your program still maintains a pointer to that object. An unused object, or unreferenced object, is no longer referenced by any part of your program. So the memory used by an unreferenced object can be reclaimed. In a programming language like C, allocating and deallocating memory is a manual process. In Java, process of deallocating memory is handled automatically by the garbage collector.
This session is all about - the mechanism provided by Java Virtual Machine to reclaim heap space from objects which are eligible for Garbage collection.
Presentation provides introduction and detailed explanation of the Java 8 Lambda and Streams. Lambda covers with Method references, default methods and Streams covers with stream operations,types of streams, collectors. Also streams are elaborated with parallel streams and benchmarking comparison of sequential and parallel streams.
Additional slides are covered with Optional, Splitators, certain projects based on lambda and streams
Java 11 is the second LTS release after Java 8. Java 11 onwards, Oracle JDK would no longer be free for commercial use.
Agenda:
~ Java 11
~ How to download Java 11 free version
~ Important changes and information.
~ Java 11 Features and Enhancements
~ Removed Features
~ Deprecated Features
~ Migration to Java 11
Java 9/10/11 - What's new and why you should upgradeSimone Bordet
Java 11 is the new Java release and, differently from Java 9 and Java 10, it is a "Long Term Support" release - we will see what that means exactly.
This presentation details the main new features of Java 11, starting from licensing (where there are important changes - in particular the Oracle JDK may only be used in production if you have a support contract with Oracle), to arrive to the new Java 11 features, with a quick peek back at what was introduced in Java 9 and Java 10.
The main Java 11 arguments are:
• Two new garbage collectors: EpsilonGC e ZGC
• Support for TLS 1.3
• Possibility to execute a single source file
• New HTTP client based on the Flow API
• Removal of modules (CORBA, JTA, @Inject, ecc.)
• Bytecode news (nest-mates, dynamic constants)
GARBAGE COLLECTOR Automatic garbage collection is the process of looking at heap memory, identifying which objects are in use and which are not, and deleting the unused objects. An in use object, or a referenced object, means that some part of your program still maintains a pointer to that object. An unused object, or unreferenced object, is no longer referenced by any part of your program. So the memory used by an unreferenced object can be reclaimed. In a programming language like C, allocating and deallocating memory is a manual process. In Java, process of deallocating memory is handled automatically by the garbage collector.
This session is all about - the mechanism provided by Java Virtual Machine to reclaim heap space from objects which are eligible for Garbage collection.
Presentation provides introduction and detailed explanation of the Java 8 Lambda and Streams. Lambda covers with Method references, default methods and Streams covers with stream operations,types of streams, collectors. Also streams are elaborated with parallel streams and benchmarking comparison of sequential and parallel streams.
Additional slides are covered with Optional, Splitators, certain projects based on lambda and streams
Java 11 is the second LTS release after Java 8. Java 11 onwards, Oracle JDK would no longer be free for commercial use.
Agenda:
~ Java 11
~ How to download Java 11 free version
~ Important changes and information.
~ Java 11 Features and Enhancements
~ Removed Features
~ Deprecated Features
~ Migration to Java 11
Java 9/10/11 - What's new and why you should upgradeSimone Bordet
Java 11 is the new Java release and, differently from Java 9 and Java 10, it is a "Long Term Support" release - we will see what that means exactly.
This presentation details the main new features of Java 11, starting from licensing (where there are important changes - in particular the Oracle JDK may only be used in production if you have a support contract with Oracle), to arrive to the new Java 11 features, with a quick peek back at what was introduced in Java 9 and Java 10.
The main Java 11 arguments are:
• Two new garbage collectors: EpsilonGC e ZGC
• Support for TLS 1.3
• Possibility to execute a single source file
• New HTTP client based on the Flow API
• Removal of modules (CORBA, JTA, @Inject, ecc.)
• Bytecode news (nest-mates, dynamic constants)
Introduction to Koltin for Android Part I Atif AbbAsi
Welcome to Android Basics in Kotlin! In this course, you'll learn the basics of building Android apps with the Kotlin programming language. Along the way, you'll develop a collection of apps to start your journey as an Android developer.
Introduction to Java Programming, Basic Structure, variables Data type, input...Mr. Akaash
This is First Lecture of java Programming which cover all basic points (ie. History and feature of java, Introduction to java, about variables data type and compilation....
Presentation given at the Toulouse JUG in Dec 2019
GraalVM and its native-image component allow building native standalone executables from Java or any other language compiling to Java bytecode like Scala or Kotlin.
This talks goes through the practical steps leading to producing a native executable for a command-line tool, explaining the benefits and also the limits of GraalVM native-image.
All the fundamental concepts and tools for understanding performance tuning in Java. Garbage collection, memory management and collector types and tools for profiling Java applications.
Azul Product Manager Matt Schuetze's presentation on JVM memory details to the Philadelphia Java User Group.
This session dovetails with the March, 2014 PhillyJUG deep dive session topic focused on Java compiler code transformation and JVM runtime execution. That session exposes myths that Java is slow and Java uses too much memory. In this session we will take a deeper look at Java memory management. The dreaded Out of Memory (OOM) error is one problem. Garbage collector activity and spikes leading to long pauses is another. He covers the foundations of garbage collection and why historically Java gets a bad rap, even though GC provides a marvelous memory management paradigm.
Introduction to Koltin for Android Part I Atif AbbAsi
Welcome to Android Basics in Kotlin! In this course, you'll learn the basics of building Android apps with the Kotlin programming language. Along the way, you'll develop a collection of apps to start your journey as an Android developer.
Introduction to Java Programming, Basic Structure, variables Data type, input...Mr. Akaash
This is First Lecture of java Programming which cover all basic points (ie. History and feature of java, Introduction to java, about variables data type and compilation....
Presentation given at the Toulouse JUG in Dec 2019
GraalVM and its native-image component allow building native standalone executables from Java or any other language compiling to Java bytecode like Scala or Kotlin.
This talks goes through the practical steps leading to producing a native executable for a command-line tool, explaining the benefits and also the limits of GraalVM native-image.
All the fundamental concepts and tools for understanding performance tuning in Java. Garbage collection, memory management and collector types and tools for profiling Java applications.
Azul Product Manager Matt Schuetze's presentation on JVM memory details to the Philadelphia Java User Group.
This session dovetails with the March, 2014 PhillyJUG deep dive session topic focused on Java compiler code transformation and JVM runtime execution. That session exposes myths that Java is slow and Java uses too much memory. In this session we will take a deeper look at Java memory management. The dreaded Out of Memory (OOM) error is one problem. Garbage collector activity and spikes leading to long pauses is another. He covers the foundations of garbage collection and why historically Java gets a bad rap, even though GC provides a marvelous memory management paradigm.
Garbage collection is the most famous (infamous) JVM mechanism and it dates back to Java 1.0. Every Java developer knows about its existence yet most of the time we wish we can ignore its behavior and assume it works perfectly. Unfortunately this is not the case and if you are ignoring it, GC may hit you really hard.... in production. Furthermore the information that you may find on the web can be a lot of times misleading. In this event we will try to demystify some of the misconceptions around GC by understanding how different GC mechanisms work and how to make the right decisions in order to make them work for you.
English version of the presentation we gave at Devoxx FR 2012.
In depth analysis on how java Garbage collector works and how to minimise pause in your application.
Not so long ago we worked on a diagnostic rule related to the finalizer check. This provoked an argument on the details of the garbage collector work and the finalization of objects. Although we have been programming in C# for more than 5 years, we haven't achieved any consensus as regards this question, so I decided to study it more thoroughly.
Here I am giving the explanation about memory management in C#.
For learning more about c# you can refer this
http://skillgun.com/csharp/interview-questions-and-answers
Managing Memory in Swift (Yes, that's a thing)Carl Brown
My talk from Swift Cloud Workshop 2 in Austin, TX on 2017-09-30 about the current state of memory management with Swift in the Cloud, and whether or not Swift on the Server is mature enough for your use-case.
Learn C# basics with slides and code based on the Apress "Pro C# 5.0 and the .NET 4.5 Framework" book contents and source code
http://www.apress.com/9781430242338
http://www.apress.com/downloadable/download/sample/sample_id/1328/
The Java memory model and the Garbage Collector can drive you into serious problems if you don't know how it runs, defrags, and remove objects - this presentation is not updated for Java 8.
This presentation aims to demonstrate the importance of certain practices in Android Application Development to avoid annoying memory leaks which lead to fatal crash .
The things we don't see – stories of Software, Scala and AkkaKonrad Malawski
Opening keynote for Scalapeno, Tel Aviv 2016.
The talk focuses and explains the things we don't often see explicitly and/or don't notice when doing our daily work, yet make up a large part of the ecosystem and maturity of the ecoststem as a whole. We also dive into some of the more confusing bits around using the same word about different things in software
Dscribes about in and out of Garbage Collector. How the GC fits in .Net framework, its algorithm and some tips to being friendly with GC. Along with basic understanding of memory management in .Net (Stack vs. Heap). This also depicts about the GC visualization tools and CLR 4.0 GC – Back Ground garbage collector.
The .NET Garbage Collector (GC) is really cool. It helps providing our applications with virtually unlimited memory, so we can focus on writing code instead of manually freeing up memory. But how does .NET manage that memory? What are hidden allocations? Are strings evil? It still matters to understand when and where memory is allocated. In this talk, we’ll go over the base concepts of .NET memory management and explore how .NET helps us and how we can help .NET – making our apps better. Expect profiling, Intermediate Language (IL), ClrMD and more!
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
2. Agenda Introduction to GC Introduction to GC Algorithms Finalize() in Java Reference type in Java
3. Purpose Know how GC works Avoid traps when works with GC Enhance program performance
4. Agenda Introduction to GC Introduction to GC Algorithms Finalize() in Java Reference type in Java
5. Introduction to GC Garbage Collection Used to release non-used memories Java specification doesn’t define detail of GC, each company can implement its own GC Different JVM has different GC algorithm Sun – Solaris IBM – AIX …
6. Introduction to GC GC is a overhead, system has to stop current execution to execute GC cause short stop and may influence user experience android team make it as short as possible we can do nothing to improve GC but improve our program
7. Stack & Heap memory Instance variables and Objects lie on Heap Local variables and methods lie on the Stack Each running thread has its Stack C++ has local objects (object in stack) All Java objects live in Heap
8. Stack & Heap memory public static void main() { int a; People Rae = new People(); People Ear = new People(); Rae.father = Ear; }
9. Stack & Heap memory Stack Heap People Ear Rae People a
13. Agenda Introduction to GC Introduction to GC Algorithms Finalize() in Java Reference type in Java
14. Introduction to GC Algorithms Different JVM has different GC implementations Reference counting Mark and Sweep Stop and Copy Adaptive …
15. Reference counting If a object is referenced, the counter is increased by 1 If reference to a object is removed, then the counter is decreased by 1 GC will collect these object whose counter is 0
16. Reference counting - drawback Each object should maintain a counter Can’t identify circular condition Stack Heap People(2) A(1) Ear B(1) C(1) Rae People(1) a
17. Mark and Sweep Three phases Mark phase Sweep phase Compact phase
18. Reachable Object Root : the beginning of all reference reference from main() reference from static method() … if a object can be visited by a serious of reference from Root, it is called reachable, otherwise it is unreachable unreachable objects will be collected by GC
19. Garbage detection is ordinarily accomplished by defining a set of roots and determining reachability from the roots. An object is reachable if there is some path of references from the roots by which the executing program can access the object. The roots are always accessible to the program. Any objects that are reachable from the roots are considered live. Objects that are not reachable are considered garbage, because they can no longer affect the future course of program execution.
20. Mark phase There are two method to mark reachable objects Tracing Reference counting
21. Tracing From Roots, search all reachable objects and mark them avoid circular reference Stack Heap People A Ear B C Rae People a
22. Sweep phase After mark phase, these which not be referenced are not marked GC will release their memory
23. Compact phase After several GCs, Heap may contain fragments Need to be rearranged Two algorithms Compacting Copying …
32. Two basic approaches to distinguishing live objects from garbage are reference counting and tracing.
33. Reference counting garbage collectors distinguish live objects from garbage objects by keeping a count for each object on the heap. The count keeps track of the number of references to that object. Tracing garbage collectors, on the other hand, actually trace out the graph of references starting with the root nodes. Objects that are encountered during the trace are marked in some way. After the trace is complete, unmarked objects are known to be unreachable and can be garbage collected.
34. A disadvantage of reference counting is that it does not detect cycles.
35. Some Java objects have finalizers, others do not. Objects with finalizers that are left unmarked after the sweep phase must be finalized before they are freed. Unmarked objects without finalizers may be freed immediately unless referred to by an unmarked finalizable object. All objects referred to by a finalizable object must remain on the heap until after the object has been finalized.
36. Compacting collectors Two strategies commonly used by mark and sweep collectors are compacting and copying. heap fragmentation
37. Agenda Introduction to GC Introduction to GC Algorithms Finalize() in Java Reference type in Java
38. finalize() Called before the object's memory is being reclaimed by the VM. The default implementation of the method is empty, which is also expected by the VM, but subclasses can override finalize() as required. Uncaught exceptions which are thrown during the execution of this method cause it to terminate immediately but are otherwise ignored. Note that the VM does guarantee that finalize() is called at most once for any object, but it doesn't guarantee when (if at all) finalize() will be called.
39. finalize() If one object override its finalize(), this object is called finalizable If a object doesn’t override its finalize(), when GC collect it, its memory is freed directly If a object is finalizable, when GC collect it, this object will be send into a queue, and its finalize() will then be executed After finalize() been successfully executed, then it will be release in next GC
40. finalize() If a object is referenced by an finalizable object, it will be released after the finalizable object is released
41. Finalizable - Drawback All finalizable need to be executed by an independent thread, but the priority of this is not high May keep too much unused object in Heap If its finalize() does not execute corrected (return Exception), then this object will never be released All objects it refer to will never be released
42. What can I do to improve GC finalize() is supposed to be used to release memory only (ex. native code) Set obj = null whenever this object is no longer used Some Java objects provide reusable objects, use them instead of creating new one (ex. Thread pool) Do not override finalize() if really not necessary
43. Agenda Introduction to GC Introduction to GC Algorithms Finalize() in Java Reference type in Java
44. Reference Type in Java Reference type associates with GC There are four kind of references in Java Strong reference Soft reference Weak reference Phantom reference
45. Reference Type in Java Strongly reachable: An object that can be accessed by a strong reference.Softly reachable: An object that is not strongly reachable and can be accessed through a soft reference.Weakly reachable: An object that is not strongly or softly reachable and can be accessed through a weak reference.Phantomly reachable: An object that is not strongly, softly, or weakly reachable, has been finalized, and can be accessed through a phantom reference.
46. Strong Reference Object obj = new Object(); GC can not free Strong reachable object until there are no more reference to this object
47. Soft Reference Not a solid reference When Memory is not enough, GC can release Soft reachable objects Good implement to data cache
48. Weak Reference Weaker than Soft reference Every time when GC starts, weak reachable objects are collected Disposable objects
49. Weak Reference Once the garbage collector decides that an object obj is is weakly-reachable, the following happens: A set ref of references is determined. ref contains the following elements: All weak references pointing to obj. All weak references pointing to objects from which obj is either strongly or softly reachable. All references in ref are atomically cleared. All objects formerly being referenced by ref become eligible for finalization. At some future point, all references in ref will be enqueued with their corresponding reference queues, if any.
50. Phantom Reference Weakest reference Work with ReferenceQueue class The PhantomReference class is useful only to track the impending collection of the referring object. When the garbage collector determines an object is phantomly reachable, the PhantomReference object is placed on its ReferenceQueue. The PhantomReference object referred to has been finalized and is ready to be collected.
51. Phantom Reference Phantom references are useful for implementing cleanup operations that are necessary before an object gets garbage-collected. They are sometimes more flexible than the finalize() method.