Search results
Results from the WOW.Com Content Network
A "sawtooth" pattern of memory utilization may be an indicator of a memory leak within an application, particularly if the vertical drops coincide with reboots or restarts of that application. Care should be taken though because garbage collection points could also cause such a pattern and would show a healthy usage of the heap.
Memory errors due to encoding specificity means that the memory is likely not forgotten, however, the specific cues used during encoding the primary event are now unavailable to help remember the event. The cues used during encoding are dependent on the environment of the individual at the time the memory occurred.
On x86 there exists an older memory management mechanism known as segmentation. If the application loads a segment register with the selector of a non-present segment (which under POSIX-compliant OSes can only be done with assembly language), the exception is generated. Some OSes used that for swapping, but under Linux this generates SIGBUS.
Hardware and software failure are the two main causes for data loss. Background radiation, head crashes, and aging or wear of the storage device fall into the former category, while software failure typically occurs due to bugs in the code. Cosmic rays cause most soft errors in DRAM. [1]
Thus, accessing data stored in DRAM causes memory cells to leak their charges and interact electrically, as a result of high cells density in modern memory, altering the content of nearby memory rows that actually were not addressed in the original memory access. [10]
The most basic way to implement checkpointing is to stop the application, copy all the required data from the memory to reliable storage (e.g., parallel file system), then continue with execution. [1] In the case of failure, when the application restarts, it does not need to start from scratch.
Poor CPU cooling due to a CPU heatsink and case fans (or filters) that's clogged with dust or has come loose. Overclocking beyond the highest clock rate at which the CPU is still reliable. Failing motherboard. Failing processor. Failing memory. Failing I/O controllers, on either the motherboard or separate cards. Failing I/O devices.
ECC memory usually [vague] involves a higher price when compared [when?] to non-ECC memory, due to additional hardware required for producing ECC memory modules [citation needed], and due to lower production volumes of ECC memory and associated system hardware [citation needed] [when?].