Shift Left：上流テスト（Developer's Test）を増やせば下流のテストはしなくてもいい） multidisciplinary team whose members work together from start to finish アジャイルにおいてはシフトレフトの活動は必須であり、なおシステムテストですべき活動は…

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learning.oreilly.com 5 Software testing principles 5.1.3 Detecting regressions and limiting debugging A passing unit test suite confirms that your code works and gives you the confidence to modify your existing code, either for refactoring…

Chapter 5. An Introduction to Garbage Collection the GC algorithm scans all objects that are reachable via one of the root objects. Objects that are reachable via a GC root are live objects; the remaining unreachable objects are garbage 引…

Chapter 7. Heap Memory Best Practices We have two conflicting goals here. The first general rule is to create objects sparingly and to discard them as quickly as possible. Using less memory is the best way to improve the efficiency of the …

chapter 3 Operating System 3.2.1 Kernel Unix-like operating systems including Linux and BSD have a monolithic kernel that manages CPU scheduling, memory, file systems, network protocols, and system devices KernelはCPU, memory, file system…

Chapter 1. Introduction 1.5.1 Subjectivity Performance, on the other hand, is often subjective. With performance issues, it can be unclear whether there is an issue to begin with, and if so, when it has been fixed. What may be considered “…