![]() ![]() Region of actual physical memory, arrange to have that memory allocated by your test software, and hold it in this allocated state, then run memtester on it Safe to specify memory which is allocated for the system or for other applications doing so will cause them to crash. Note that the memory region will be overwritten during testing, so it is not Use to hardware developers, for testing memory-mapped I/O devices and similar. Tells memtester to test a specific region of memory starting at physical address PHYSADDR (given in hex), by mmap(2)ing /dev/mem. System has an out-of-memory process killer (like Linux), memtester or another process may be killed by the OOM killer. If the system allows allocation of more memory than is actually available (overcommit), it may lead to a deadlock, where the system halts. However, this can lead to memtester successfully allocating and mlocking essentially allįree memory on the system - if other programs are running, this can lead to excessive swapping and slowing the system down to the point that it is difficult Should figure that out, reduce the amount slightly, and try again. If you attempt to allocate more memory than is available, memtester Note that it is up to you to know how much memory you can safely allocate for testing. memtester is also limited to the amount of memory available to a single process forĮxample, on 32-bit machines with more than 4GB of memory, memtester is still limited to less than 4GB. Libraries, and other system limits take some of the available memory. Note that the maximum amount of memory that memtester can test will be less than the total amount of memory installed in the system the operating system, It will then attempt to mlock(3) this memory if it cannot do so, testing will be slower and much less effective. If this fails, it will decrease the amount of memory requested until it Memtester will malloc(3) the amount of memory specified, if possible. Still up to you to determine where the fault lies through normal hardware diagnostic procedures memtester just helps you determine whether a problem exists. Note that problems in other hardware areas (overheating CPU, out-of-specification power supply, etc.) can cause intermittent memory faults, so it is It is very effective at finding intermittent and non-deterministicįaults. Memtester is an effective userspace tester for stress-testing the memory subsystem. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |