What is the main purpose of Just-In-Time (JIT) compilation?
a) To translate code to machine language at runtime
b) To optimize disk storage
c) To manage memory allocation
d) To handle network communication
Answer: a) To translate code to machine language at runtime
Which of the following languages typically uses JIT compilation?
a) Java
b) C
c) Fortran
d) Assembly
Answer: a) Java
What is the primary advantage of JIT compilation over Ahead-Of-Time (AOT) compilation?
a) Improved runtime performance through optimization
b) Reduced compilation time
c) Increased code portability
d) Simplified code debugging
Answer: a) Improved runtime performance through optimization
In JIT compilation, what does the term “hot spot” refer to?
a) Frequently executed code sections that are optimized
b) Memory locations with high access frequency
c) Rarely executed code segments
d) Unused code sections
Answer: a) Frequently executed code sections that are optimized
Which component of a Java Virtual Machine (JVM) is responsible for JIT compilation?
a) The JIT compiler
b) The garbage collector
c) The class loader
d) The interpreter
Answer: a) The JIT compiler
What is “adaptive optimization” in the context of JIT compilation?
a) Dynamically improving the performance of frequently executed code
b) Pre-compiling all code before execution
c) Compiling code with static optimizations only
d) Ignoring runtime performance data
Answer: a) Dynamically improving the performance of frequently executed code
How does JIT compilation impact startup time of an application?
a) It may increase startup time due to runtime compilation
b) It decreases startup time significantly
c) It has no impact on startup time
d) It eliminates the need for startup altogether
Answer: a) It may increase startup time due to runtime compilation
What is the role of an interpreter in a JIT compilation system?
a) To execute bytecode before JIT compilation occurs
b) To perform JIT compilation directly
c) To handle memory management
d) To optimize network communication
Answer: a) To execute bytecode before JIT compilation occurs
What does the term “profile-guided optimization” refer to in JIT compilation?
a) Optimizing code based on profiling data collected during runtime
b) Pre-compiling all possible execution paths
c) Encrypting code to improve security
d) Managing file I/O operations
Answer: a) Optimizing code based on profiling data collected during runtime
Which of the following is a typical strategy used by JIT compilers for optimization?
a) Inlining methods
b) Pre-allocating memory
c) Static linking
d) Deferring execution
Answer: a) Inlining methods
What is “tiered compilation” in the context of JIT compilation?
a) Using multiple levels of compilation to balance startup and runtime performance
b) Compiling code in different programming languages
c) Executing code in parallel threads
d) Encrypting code at various stages
Answer: a) Using multiple levels of compilation to balance startup and runtime performance
Which of the following is a disadvantage of JIT compilation?
a) Increased memory usage due to compiled code
b) Improved runtime performance
c) Better optimization for hot spots
d) Reduced startup time
Answer: a) Increased memory usage due to compiled code
In JIT compilation, what does “method inlining” involve?
a) Replacing method calls with the actual code of the methods
b) Compiling methods separately
c) Removing methods from the codebase
d) Encrypting method names
Answer: a) Replacing method calls with the actual code of the methods
What is the role of “adaptive optimization” in JIT compilers?
a) To dynamically apply optimizations based on runtime performance data
b) To statically compile all code at once
c) To handle I/O operations
d) To manage code security
Answer: a) To dynamically apply optimizations based on runtime performance data
Which of the following best describes “Hot Code Path”?
a) Frequently executed code paths that benefit from JIT optimization
b) Code paths with high memory consumption
c) Rarely executed code paths
d) Code paths that are only compiled once
Answer: a) Frequently executed code paths that benefit from JIT optimization
What is “speculative optimization” in JIT compilation?
a) Applying optimizations based on assumed conditions that may be true during execution
b) Compiling all code at once
c) Pre-allocating all resources
d) Encrypting code to prevent tampering
Answer: a) Applying optimizations based on assumed conditions that may be true during execution
How does JIT compilation affect the performance of long-running applications?
a) It generally improves performance by optimizing frequently executed code
b) It decreases performance by increasing memory usage
c) It has no effect on performance
d) It slows down the application significantly
Answer: a) It generally improves performance by optimizing frequently executed code
What does “on-demand compilation” mean in JIT systems?
a) Compiling code only when it is needed during execution
b) Pre-compiling all code before execution
c) Ignoring code that is not frequently executed
d) Compiling code at design time
Answer: a) Compiling code only when it is needed during execution
Which of the following is a common optimization performed by JIT compilers?
a) Dead code elimination
b) Pre-computing values
c) Compiling code in parallel
d) Using static memory allocation
Answer: a) Dead code elimination
What is “Just-In-Time (JIT) compilation” primarily used for in Java?
a) To improve the performance of Java bytecode at runtime
b) To manage network communication
c) To handle file I/O operations
d) To compile Java code before execution
Answer: a) To improve the performance of Java bytecode at runtime
What is the impact of JIT compilation on the memory footprint of an application?
a) It increases memory usage due to storing compiled code
b) It decreases memory usage by removing unused code
c) It has no impact on memory usage
d) It reduces memory footprint significantly
Answer: a) It increases memory usage due to storing compiled code
Which of the following best describes “Hot Spot Compilation”?
a) Compiling frequently executed code paths to improve performance
b) Compiling rarely executed code paths
c) Compiling code before it is executed
d) Encrypting frequently accessed code
Answer: a) Compiling frequently executed code paths to improve performance
In JIT compilation, what is meant by “Code Caching”?
a) Storing compiled code in memory for reuse
b) Encrypting code to improve security
c) Pre-compiling code before execution
d) Managing network communication
Answer: a) Storing compiled code in memory for reuse
What is the main advantage of using JIT compilation in a managed runtime environment like .NET?
a) Increased runtime performance through code optimization
b) Decreased memory usage
c) Improved compile-time performance
d) Simplified code maintenance
Answer: a) Increased runtime performance through code optimization
Which of the following is a common JIT compilation strategy?
a) Tracing compilation
b) Pre-linking
c) File system optimization
d) Code obfuscation
Answer: a) Tracing compilation
What does “Hot Code” refer to in the context of JIT compilation?
a) Code segments that are executed frequently and optimized by JIT
b) Code that is never executed
c) Code that is only executed once
d) Code that is statically compiled
Answer: a) Code segments that are executed frequently and optimized by JIT
Which of the following is a typical characteristic of JIT-compiled code?
a) Runtime optimizations based on execution profiles
b) Static optimizations performed before execution
c) Code that cannot be modified during execution
d) Code that is compiled and executed in parallel
Answer: a) Runtime optimizations based on execution profiles
What is “Late Binding” in the context of JIT compilation?
a) Resolving method calls and types at runtime
b) Pre-compiling method calls and types
c) Encrypting method signatures
d) Managing memory allocations
Answer: a) Resolving method calls and types at runtime
How does JIT compilation affect cross-platform compatibility?
a) It does not affect compatibility; JIT is platform-specific
b) It improves compatibility by compiling code for multiple platforms
c) It removes the need for platform-specific code
d) It ensures that code runs only on specific platforms
Answer: a) It does not affect compatibility; JIT is platform-specific
Which of the following is a potential drawback of JIT compilation?
a) Increased initial startup time due to runtime compilation
b) Decreased overall performance
c) Reduced memory usage
d) Simplified debugging process
Answer: a) Increased initial startup time due to runtime compilation
What does “Dynamic Optimization” refer to in JIT compilation?
a) Optimizations applied based on real-time performance data
b) Static optimizations performed before runtime
c) Code encryption techniques
d) Pre-compiling code for different platforms
Answer: a) Optimizations applied based on real-time performance data
In JIT compilation, what is “Inline Expansion”?
a) Replacing method calls with the actual method code to reduce overhead
b) Encrypting code sections
c) Compiling code segments separately
d) Managing memory allocation
Answer: a) Replacing method calls with the actual method code to reduce overhead
Which JIT compilation feature helps to manage frequently called methods efficiently?
a) Method inlining
b) Static code analysis
c) Pre-compilation
d) Code obfuscation
Answer: a) Method inlining
What is the role of “Profile Data” in JIT compilation?
a) To guide the compiler in optimizing frequently executed code paths
b) To encrypt code during runtime
c) To manage network communications
d) To allocate memory for compiled code
Answer: a) To guide the compiler in optimizing frequently executed code paths
How does JIT compilation impact the debugging process?
a) It may complicate debugging due to runtime optimizations
b) It simplifies debugging by removing runtime errors
c) It has no effect on debugging
d) It improves debugging by providing more detailed error messages
Answer: a) It may complicate debugging due to runtime optimizations
What does “Code Generation” involve in JIT compilation?
a) Translating intermediate code into machine code during runtime
b) Pre-compiling code into intermediate code
c) Encrypting source code
d) Managing file I/O operations
Answer: a) Translating intermediate code into machine code during runtime
In which phase of JIT compilation is “Hot Spot Detection” performed?
a) During the profiling phase
b) During the initial code loading
c) During post-execution
d) During static code analysis
Answer: a) During the profiling phase
What does “On-Demand Compilation” mean?
a) Compiling code only when it is needed during execution
b) Compiling all code before the application runs
c) Encrypting code before compilation
d) Pre-allocating memory for code execution
Answer: a) Compiling code only when it is needed during execution
Which of the following is a benefit of using JIT compilation in dynamic languages?
a) Improved runtime performance through optimization
b) Reduced code complexity
c) Increased static type safety
d) Simplified code syntax
Answer: a) Improved runtime performance through optimization
What is “Code Profiling” used for in JIT compilation?
a) To collect data on code execution patterns for optimization
b) To encrypt code for security
c) To pre-compile code for faster execution
d) To manage memory usage
Answer: a) To collect data on code execution patterns for optimization
How does JIT compilation impact cross-platform execution?
a) It may limit cross-platform execution due to platform-specific compiled code
b) It enhances cross-platform compatibility
c) It has no impact on cross-platform execution
d) It completely eliminates platform-specific dependencies
Answer: a) It may limit cross-platform execution due to platform-specific compiled code
What is “Hot Code Path Optimization”?
a) Optimizing code paths that are frequently executed
b) Optimizing code paths that are never executed
c) Encrypting all code paths
d) Removing unused code paths
Answer: a) Optimizing code paths that are frequently executed
In JIT compilation, what does “Code Reuse” involve?
a) Using compiled code multiple times to improve performance
b) Encrypting code for reuse
c) Pre-compiling code for various platforms
d) Deleting unused code
Answer: a) Using compiled code multiple times to improve performance
What does “Execution Profile” mean in the context of JIT compilation?
a) Data collected on how code is executed to guide optimizations
b) A description of the code structure
c) A security profile for code execution
d) A static analysis of code
Answer: a) Data collected on how code is executed to guide optimizations
Which technique helps JIT compilers optimize code paths that are frequently executed?
a) Hot Spot Detection
b) Static Code Analysis
c) Pre-Compilation
d) Code Obfuscation
Answer: a) Hot Spot Detection
What does “Inline Caching” refer to in JIT compilation?
a) Caching frequently accessed method or property lookups
b) Encrypting frequently accessed code
c) Pre-compiling inline code
d) Managing memory allocations for code
Answer: a) Caching frequently accessed method or property lookups
How does JIT compilation handle polymorphism?
a) By optimizing method calls based on runtime types
b) By compiling all possible types statically
c) By removing polymorphism
d) By encrypting polymorphic methods
Answer: a) By optimizing method calls based on runtime types
Which of the following describes “Method Profiling” in JIT compilation?
a) Collecting runtime data on method usage for optimization
b) Pre-compiling methods before execution
c) Encrypting method code
d) Managing memory allocation for methods
Answer: a) Collecting runtime data on method usage for optimization
What is the role of “Runtime Profiling” in JIT compilation?
a) To gather execution statistics to guide optimizations
b) To compile code before execution
c) To encrypt runtime data
d) To manage I/O operations
Answer: a) To gather execution statistics to guide optimizations
Which aspect of JIT compilation helps to improve performance by removing unnecessary code?
a) Dead Code Elimination
b) Code Encryption
c) Code Compression
d) Static Code Analysis
Answer: a) Dead Code Elimination