Multithreading

According to Moore's law, the number of transistors on a chip doubles every 18 months. This "law" is not like any law of physics, like conservation of momentum, but is an observation by Intel cofounder Gordon Moore of how fast process engineers at the semiconductor companies

Different ways have been considered to try to unite the benefits of user-level threads with kernel-level threads. One way is use kernel-level threads and then multiplex user-level threads onto some or all of the kernel threads, as shown in the following figure. When this approach is