Term
| True or False. If you have a fast CPU, then your computer performance is good |
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Definition
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Term
| What is the linearity of computer metrics? |
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Definition
| The linearity criterion suggests that a metric should be linear or logarithmic |
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Term
| What does it mean for a computer metric to be reliable? |
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Definition
| If a metric says something, then it is actually true |
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Term
| What does it mean for a computer metric to be repeatable? |
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Definition
| It means that if you run a test with the same computer in the same environment, you will get the same answer |
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Term
| What does it mean for a computer metric to have ease of measurement? |
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Definition
| It means that the measurement should be easy- it shouldn't take years or $1,000 |
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Term
| What does it mean for a computer metric to have consistency? |
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Definition
| It means the measurement is precise and defined and can be applied across different systems (universality or generality) |
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Term
| What does it mean for a computer metric to be independent? |
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Definition
| It means that a metric does not favor one manufacturer over another |
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Term
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Definition
| Is the amount of time it takes from a request being made to it getting done (wait time) |
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Term
| What is the equation when comparing the performance of computer A to computer B? |
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Definition
| Performance_A/Performance_B = ExecutionTime_B/ExecutionTime_A |
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Term
| True or False: Clock rate is the best measure of CPU performance |
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Definition
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Term
| What does it mean to overclock your CPU? |
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Definition
| It means that the clock is sped up past it's normal designed speed- can make the CPU unstable |
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Term
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Definition
| Millions of Instructions per Second- slightly better than clock speed but still has issues- doesn't take into account how much work each instruction performs (Shift vs divide) |
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Term
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Definition
| Millions of Floating Point Operations per Second- better than MIPS but still not a uniform reliable measurement |
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Term
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Definition
| The law describes the performance increase you get when a program is run in a system where some of the operations can take place in parallel. |
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Term
| What does S, P, and fs stand for in Amdahl's law equation? |
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Definition
S = speed ratio (2 times faster, etc.)
P = The number of processors being used
fs = the fraction of the process that can only run on one processor |
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Term
| What is SPEC and what does the acronym stand for? |
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Definition
| Standard Performance Evaluation Corporation (SPEC) which is an American non-profit that sought to establish benchmarks in computer performance |
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Term
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Definition
| States that as transistors get smaller, their power density stays constant, so that the power stays in proportion with the area |
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Term
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Definition
| The amount of work per unit of time (megabits/second) |
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Term
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Definition
| When designers have a goal they meet a goal above it so that no matter the circumstance they can meet the original goal |
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Term
| True or False: The Dennard scale is also known as the Mosfet scale. |
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Definition
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Term
| The "C" in SPEC stands for ___________. |
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Definition
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Term
| A metric is _____________ if it can be precisely defined and applied across different systems. |
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Definition
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Term
| A metric is _________________ if it always yields the same results under the same conditions. |
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Definition
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Term
| Which law tells you the performance increase you get for more parallelism. |
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Definition
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Term
| A metric is _______________ if it correctly indicates whether one computer is faster than another. |
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Definition
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Term
| True or False: There are no drawbacks with overclocking your CPU. |
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Definition
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Term
| True or False: The time from when a request is made to when the request starts operations is call lag time. |
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Definition
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Term
| True or False: MFLOPS is a "better" measurement of CPU performance than clock rate. |
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Definition
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Term
| True or False: Amhahl's law is strictly a measurement of the CPU capability and has nothing to do with the applications being run on the CPU |
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Definition
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Term
| True or False: Throughput is the amount of work performed by a computer per unit time. |
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Definition
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Term
| True or False: A measurement of the performance of one computer to another computer is classified as a relative performance measurement. |
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Definition
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Term
| True or False. A CPU performance metric which does not favor one manufacture over another is said to be reliable. |
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Definition
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Term
| True or False. Benchmarks are programs that typically focus on a single aspect of a computer's performance like floating point or graphics processing. |
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Definition
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Term
| What did Spectre take advantage of? |
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Definition
| Speculative execution- got access to instructions/data that weren't in the correct execution path |
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Term
| How do you mitigate a security issue of jumping to a function? |
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Definition
| Use BTI (Branch Targeting Identification)- so when the program branches, the very first instruction is BTI instruction. If it's not there you get kicked out of the system |
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Term
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Definition
| Accessing something outside of it's scope |
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Term
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Definition
| referencing an object after it has expired |
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Term
| What is a security issue with activation records? |
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Definition
| If a variable is declared to be static, the activation record does not go away which can cause problems |
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Term
| What's a method to secure memory? |
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Definition
| A secure gateway, so if my code needs something from memory, it first accesses a secure gateway that has a higher privilege, which checks things, makes the call, and returns the value back to the program |
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Term
| The Pointer Authentication Code (PAC) countermeasure on the ARM CPU is to primarily protect again which of the following attacks? |
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Definition
| Return-Oriented Programming (ROP) attack |
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Term
| The phase "security by obscurity" is best defined as: |
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Definition
| a terrible approach for modern security systems |
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Term
| True or False: In most instances, it cannot be determined if inappropriate accesses to privileged memory or instructions occurs due to a programming error, or the result of an attack on the system. |
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Definition
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Term
| True or False: Spatial safety is violated when an object is accessed outside of its true bounds. |
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Definition
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Term
| True or False. A vulnerability in a security system will always lead to the system being compromised. |
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Definition
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Term
| The closest/best description of the “use after free” vulnerability is: |
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Definition
| reference to an object is used after it has expired |
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Term
| True or False. Temporal safety is violated when a reference to an object is used prior to the object being instantiated. |
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Definition
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