free list

简明释义

免税货物表,免税进口货单

英英释义

例句

1.When an object is deleted, it is added to the free list for future use.

当一个对象被删除时，它会被添加到空闲列表中以备将来使用。

2.The software maintains a free list for unused memory blocks.

该软件维护一个空闲列表，用于未使用的内存块。

3.The operating system uses a free list to track available physical memory.

操作系统使用空闲列表来跟踪可用的物理内存。

4.Developers can optimize performance by managing the free list efficiently.

开发人员可以通过有效管理空闲列表来优化性能。

5.In garbage collection, reclaimed objects are placed in the free list.

在垃圾回收中，被回收的对象会被放入空闲列表。

作文

In the world of computer science, particularly in memory management, the term free list refers to a data structure that keeps track of memory blocks that are not currently in use. This concept is crucial for efficient memory allocation and deallocation, which are vital for the performance of any software application. A free list allows the operating system to manage memory more effectively by keeping a record of available memory spaces, thus optimizing resource usage. When a program requests memory, the operating system can quickly check the free list to find an appropriate block of memory to allocate. Once the memory is no longer needed, it can be returned to the free list, making it available for future allocations. This cycle of allocation and deallocation is essential for maintaining system stability and performance. One of the significant advantages of using a free list is that it minimizes fragmentation, which occurs when free memory is split into small, non-contiguous blocks. Fragmentation can lead to inefficient memory usage, as there may be insufficient contiguous memory available for larger requests. By managing memory through a free list, systems can reduce the likelihood of fragmentation and ensure that memory is utilized optimally. However, implementing a free list is not without challenges. For instance, if the list becomes too long, the time taken to search for a suitable block of memory can increase, potentially slowing down the allocation process. Therefore, developers often need to balance the size and efficiency of the free list with the overall performance of the system. Moreover, there are various strategies for managing a free list. Some systems may use a first-fit approach, where the first available block that meets the size requirement is allocated. Others might implement a best-fit strategy, which searches for the smallest available block that can accommodate the request, thereby leaving larger blocks intact for future use. Each method has its pros and cons, and the choice often depends on the specific requirements of the application and the expected memory usage patterns. In conclusion, the concept of a free list is fundamental to effective memory management in computing. It plays a vital role in ensuring that memory is allocated and deallocated efficiently, helping to maintain optimal system performance. Understanding how a free list works, along with its advantages and challenges, is essential for anyone involved in software development or systems programming. As technology continues to evolve, the principles behind the free list will remain relevant, adapting to new challenges and innovations in the field of computer science.

在计算机科学的世界中，特别是在内存管理中，术语free list指的是一种数据结构，用于跟踪当前未使用的内存块。这个概念对于高效的内存分配和释放至关重要，而这些对于任何软件应用程序的性能都是必不可少的。free list允许操作系统通过记录可用的内存空间来更有效地管理内存，从而优化资源使用。当程序请求内存时，操作系统可以快速检查free list，以找到适当的内存块进行分配。一旦不再需要内存，就可以将其返回到free list，使其可以用于未来的分配。这种分配和释放的循环对于维持系统的稳定性和性能至关重要。使用free list的一个重大优势是，它可以最小化碎片化的发生。碎片化是指自由内存被分割成小的、不连续的块。当存在较大的请求时，这可能导致内存使用效率低下，因为可能没有足够的连续内存可用。通过通过free list管理内存，系统可以减少碎片化的可能性，确保内存得到最佳利用。然而，实现free list并非没有挑战。例如，如果列表变得过长，搜索合适的内存块所需的时间可能会增加，从而可能减慢分配过程。因此，开发人员通常需要在free list的大小和效率与系统的整体性能之间取得平衡。此外，管理free list有多种策略。一些系统可能使用首次适应的方法，即分配满足大小要求的第一个可用块。其他系统可能实施最佳适应策略，搜索能够满足请求的最小可用块，从而保持较大的块完整以备将来使用。每种方法都有其优缺点，选择通常取决于应用程序的具体要求和预期的内存使用模式。总之，free list的概念对于计算中的有效内存管理至关重要。它在确保内存高效分配和释放方面发挥着重要作用，有助于保持最佳系统性能。理解free list的工作原理及其优势和挑战，对于任何参与软件开发或系统编程的人来说都是必不可少的。随着技术的不断发展，free list背后的原则将继续保持相关性，以适应计算机科学领域的新挑战和创新。