It loses performance for the simplicity of program design and maintenance.
#HASHTAB FOR LINUX SOFTWARE#
Secondly, the kernel is a software that pays more attention to performance. From a philosophical point of view, this also complies with the KISS clause.
#HASHTAB FOR LINUX CODE#
This also means that the readability and maintainability of the code are better than other complex data structures, and the risk of bugs is also lower. Why does the kernel use these two data structures extensively?įirst of all, these two data structures are very simple, and simplicity includes two aspects: easy to understand and easy to use. The doubly linked list (list) as the basic data structure and the hash table based on the list occupy most of the data structure. Why is the hash table so magical? Hash table can realize efficient data storage and search, and storage and search are the two most widely used operations in programming.Īnyone who has read the Linux kernel source code may find that there are not too many complex data structures. Hash tables in the Linux kernel are widely used, and most of the language features in the PHP kernel are also implemented based on hash tables. Data Compression can be used to save space.The cryptographic technology of digital signature has high security.The search speed has nothing to do with the amount of data.The four major advantages of Hash are as follows. So when the index key is the only performance to get elements from Hashtable, the performance will be better. For example, student and teacher will be placed in different buckets, while dog and god will be placed in the same bucket. When searching for a value in the Hashtable, a hash program code will be generated for the value, and a bucket related to the hash program code will be searched. When an object is added to the Hashtable, it is stored in the bucket associated with the hash program code that matches the object hash program code. Index key (Key) is some attribute value (Value) of the stored object. Hash Function is an algorithm that returns a numerical hash program code based on an index key.
Buckets are virtual subgroups of elements in Hashtable, which can make searching and obtaining in most collections easier and faster. Hashtable objects are composed of buckets containing elements in the collection. Hashtable is a collection of key and value pairs organized according to the hash program code of the index key. 2019 Unicorn Enterprise Heavy Recruitment Standards for Python Engineers > View Image Guide
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