Apple Xserve Diagnostics - Manual (Page 32)

32 Appendix AXD Tools Test Reference
Memory (Multicore) Tests
Multicore memory tests test the first 2.5 GB of memory using all available CPU cores.
In AXD EFI tools, all memory tests (simple, multicore, extended, and SMBIOS) are
grouped under Memory tests.
Note: The time required to complete memory tests correlates to the size of memory
being tested. These estimates are based on testing 1 GB of memory.
Memory (Extended) Tests
Extended memory tests test all available memory.
Block Checkerboard 32 10 seconds Alternates 32-bit words with all 1s and
all 0s, and then with all 0s and all 1s
Bit Checkerboard 32 10 seconds Alternates bits with all 1s and all 0s,
and then with all 0s and all 1s
Sequential Byte Block 32 14 minutes Fills all bytes sequentially with
patterns starting at 0x00 and ending
at 0xFF
Walking One 32 5 minutes Walks 1s up and down memory
Walking Zero 32 5 minutes Walks 0s up and down memory
Walking Spread Bit 32 5 minutes Walks 0b01 up and then walks 0b10
down memory
Walking Bit Flip 32 5 minutes Alternates words with walking 1 and
walking 0, and then alternates with
walking 0 and walking 1
Test Estimated completion time Description
Test Estimated completion time Description
MP Block Checkerboard 32 5 seconds Alternates 32-bit words with all 1s and
all 0s, and then with all 0s and all 1s
MP Bit Checkerboard 32 5 seconds Alternates bits with all 1s and all 0s,
and then with all 0s and all 1s
MP Sequential Byte Block 32 8 minutes Fills all bytes sequentially with
patterns starting at 0x00 and ending
at 0xFF
MP Walking One 32 2 minutes Walks 1s up and down memory
MP Walking Zero 32 2 minutes Walks 0s up and down memory
MP Walking Spread Bit 32 2 minutes Walks 0b01 up and then walks 0b10
down memory
MP Walking Bit Flip 32 2 minutes Alternates words with walking 1 and
walking 0, and then alternates words
with walking 0 and walking 1