Just-In-Time (JIT) compilation(MCQs)

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