Thrash metal (sometimes referred to simply as thrash), is an extreme subgenre of heavy metal that is characterized by its fast tempo and aggression. Thrash metal songs typically use fast, percussive and low-register guitar riffs, overlaid with shredding-style lead work.[1] Thrash metal lyrics often deal with social issues using visceral and blunt language, an approach which partially overlaps with the hardcore genre. The "Big Four" bands of thrash metal are Metallica, Megadeth, Anthrax, and Slayer[2], who simultaneously created and popularized the genre in the early 1980s.
The origins of thrash metal are generally traced to the late 1970s and early 1980s, when a number of bands began incorporating the sound of the New Wave of British Heavy Metal,[3] creating a new genre and developing into a separate movement from punk rock and hardcore. This genre is more aggressive compared to its relative, speed metal, and can be seen in part to be a reaction to the lighter, more widely acceptable sounds and themes of glam metal[4].
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In computer science, thrash (verb), is the term used to describe a degenerate situation on a computer where increasing resources are used to do a decreasing amount of work. In this situation the system is said to be thrashing. Usually it refers to two or more processes accessing a shared resource repeatedly such that serious system performance degradation occurs because the system is spending a disproportionate amount of time just accessing the shared resource. Resource access time may generally be considered as wasted, since it does not contribute to the advancement of any process.
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