What is the memory barrier?
In the area of calculation, the memory barrier is a type of ordering restrictions that helps balance the demand in mind that is available for processing various commands and functions. Also known as "Membar" or as a "memory fence", the idea is to create a kind of hierarchical order or progression for all awaiting tasks that have to do with this memory. This allows you to perform these tasks in a logical sequence and prevent memory overload, which could permanently damage the system's memory capacity.
In real practice, the memory barrier is a class or set of instructions that are designed to prevent the use of available memory in some way that could undermine the real function of this memory. Because a barrier or fence is based on hardware, it means that it is usually associated with the function of the central processing unit (CPU) or some other devices. This may often be necessary when the memory serves more than a a single machine or device, and access to this memory must beAllocated in some logical way. Without creating this type of memory barrier to maintain functions in a logical sequence, it is possible to perform different tasks out of service and possibly even damaging stored data is greatly improved.
The term itself shows what is really happening. The fence usually performs two functions simultaneously, keeps something inside and at the same time prevents something out there, to enter the space except for some gate. In this way, access to what is inside is kept controlled by the porter. Instructions such as this guard work with the memory barrier, allowing access to memory only according to the ordered instructions. The final result is that the data is accessible logical, the tasks are completed accurately and the congestion potential is covered within adequate limits.
The necessity of some memory barrier is increasingly obvious because computer systems become stronger and used to drive a widthThe range of external devices relying on memory for their function. If the class of the instructions used for the barrier is correctly prepared, the hardware will respond appropriately and all devices will work as it should. In the event that the barrier should decompose or stop working, even the simplest orders may be extremely difficult.