AdvancedMultiple choice
On a two-socket server, a latency-critical thread sometimes runs noticeably slower. Memory was allocated by a thread on the other socket. What is going on?
- AThe two sockets share one cache, so they evict each other’s data
- BNUMA: remote memory is slower than local memory
- CThe operating system is compressing the memory in the background
- DHyper-threading always halves the speed of the second socket
The worked solution is in Premium
The answer, the full working and the one idea to take away – for this and all 1,322 questions in the bank. Answer it in practice and your working is marked, with a known mistake named when you make one.
Learn the method
Reported in interviews at
More systems and low latency questions
- AVX-512 registers are 512 bits wide. How many float64 values does one hold?Foundation
- A cache line is 64 bytes. How many 32-bit integers fit in one?Foundation
- A single scan reads 1 GB from main memory at a sustained 20 GB/s.Foundation
- Walking a matrix through the cache, part 1 of 3Foundation
- Traversing a linked list and traversing an array are both O(n).Applied
- An L1 data cache holds 32 KB. How many float64 values fit in it?Applied