JVM memory model
E356916
The JVM memory model is the formal specification that governs how Java threads interact through shared memory, defining rules for visibility, ordering, and atomicity of operations to ensure correct concurrent behavior.
All labels observed (5)
| Label | Occurrences |
|---|---|
| JSR-133 | 1 |
| JVM memory model canonical | 1 |
| Java Memory Model | 1 |
| Java memory model | 1 |
| concurrency and the Java Memory Model | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3425894 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: JVM memory model Context triple: [Java Virtual Machine Specification, defines, JVM memory model]
-
A.
HotSpot JVM
HotSpot JVM is a high-performance Java Virtual Machine known for its advanced just-in-time compilation and adaptive optimization techniques, originally developed by Sun Microsystems.
-
B.
Java Virtual Machine Specification
The Java Virtual Machine Specification is the formal technical document that defines the architecture, behavior, and execution model of the Java Virtual Machine, ensuring consistent implementation of Java across different platforms.
-
C.
G1 GC
G1 GC is a server-style garbage collector for the HotSpot JVM designed to provide predictable, low-pause-time memory management by partitioning the heap into regions and collecting them incrementally.
-
D.
Memory Manager
Memory Manager is a classic Macintosh system software component responsible for allocating, tracking, and organizing application and system memory.
-
E.
Orinoco garbage collector
Orinoco garbage collector is V8’s low-latency, incremental and concurrent garbage collection system designed to improve JavaScript performance and responsiveness.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: JVM memory model Target entity description: The JVM memory model is the formal specification that governs how Java threads interact through shared memory, defining rules for visibility, ordering, and atomicity of operations to ensure correct concurrent behavior.
-
A.
HotSpot JVM
HotSpot JVM is a high-performance Java Virtual Machine known for its advanced just-in-time compilation and adaptive optimization techniques, originally developed by Sun Microsystems.
-
B.
Java Virtual Machine Specification
The Java Virtual Machine Specification is the formal technical document that defines the architecture, behavior, and execution model of the Java Virtual Machine, ensuring consistent implementation of Java across different platforms.
-
C.
G1 GC
G1 GC is a server-style garbage collector for the HotSpot JVM designed to provide predictable, low-pause-time memory management by partitioning the heap into regions and collecting them incrementally.
-
D.
Memory Manager
Memory Manager is a classic Macintosh system software component responsible for allocating, tracking, and organizing application and system memory.
-
E.
Orinoco garbage collector
Orinoco garbage collector is V8’s low-latency, incremental and concurrent garbage collection system designed to improve JavaScript performance and responsiveness.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
concurrency model
ⓘ
formal specification ⓘ memory model ⓘ |
| allows |
caching of variables within defined constraints
ⓘ
out-of-order execution within defined constraints ⓘ |
| appliesTo |
Java Virtual Machine
ⓘ
Java threads ⓘ |
| clarifies |
behavior of volatile reads and writes
ⓘ
interaction between locks and memory visibility ⓘ when final fields become visible to other threads ⓘ |
| constrains |
reordering of reads and writes
ⓘ
visibility of writes between threads ⓘ when a write by one thread becomes visible to another ⓘ |
| defines |
data race conditions
ⓘ
final field semantics ⓘ happens-before relationship ⓘ lock and monitor semantics ⓘ rules for atomicity of certain operations ⓘ rules for ordering of memory operations ⓘ rules for visibility of shared variables ⓘ synchronization semantics ⓘ volatile variable semantics ⓘ |
| doesNotDefine |
real-time guarantees
ⓘ
scheduling of threads ⓘ |
| ensures | sequential consistency for correctly synchronized programs ⓘ |
| goal |
allow safe reordering by compilers and processors
ⓘ
ensure correct concurrent behavior ⓘ provide predictable multithreaded execution ⓘ |
| influences |
design of concurrent Java libraries
ⓘ
java.util.concurrent ⓘ
surface form:
java.util.concurrent package
lock-free and wait-free algorithms in Java ⓘ |
| introducedIn |
Java Platform, Standard Edition
ⓘ
surface form:
Java 5
|
| partOf |
Java Language Specification
ⓘ
surface form:
Java language specification
Java platform specifications ⓘ
surface form:
Java platform
|
| predecessor | original Java memory model (pre-Java 5) ⓘ |
| relatedTo |
JVM memory model
self-linksurface differs
ⓘ
surface form:
JSR-133
Java Language Specification ⓘ
surface form:
Java Language Specification section on memory model
|
| requires |
happens-before edges for safe publication
ⓘ
synchronization to avoid data races ⓘ |
| revisedBy | JSR-133 expert group ⓘ |
| scope |
inter-thread communication via shared variables
ⓘ
shared memory concurrency ⓘ |
| supports |
compiler optimizations
ⓘ
processor-level optimizations ⓘ |
| usedBy |
JIT compiler
ⓘ
JVM runtime ⓘ javac ⓘ
surface form:
Java compiler
|
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: JVM memory model Description of subject: The JVM memory model is the formal specification that governs how Java threads interact through shared memory, defining rules for visibility, ordering, and atomicity of operations to ensure correct concurrent behavior.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Java Memory Model
this entity surface form:
concurrency and the Java Memory Model
this entity surface form:
JSR-133
this entity surface form:
Java memory model