Cache line
A cache line is a fixed-size block of contiguous memory that a processor cache transfers and manages as a unit.
100 Go Mistakes and How to Avoid Them
A cache line is the fixed-size unit of contiguous memory transferred between main memory and a processor cache.
- How it is used
- Guides data layout and access-pattern choices when optimizing data-intensive, CPU-bound Go code.
- How deep it goes
- Explains fixed-size transfers through misses, strides, cache placement, and line-level invalidation, without specifying hardware-dependent cache behavior.
- Examples
- Contrasts slice and struct layouts, 512- and 513-column matrices, and two goroutines updating separate fields.
- What you can do after
- Diagnose/debug with it when contiguous reads waste fetched data or independent concurrent writes interfere.
Read how 100 Go Mistakes and How to Avoid Them explains cache line →
Rust in Action: Systems programming concepts and techniques
A cache line is a small fixed-size block of data transferred between RAM and a processor cache as a unit.
- How it is used
- Frames cache lines as the unit connecting processor caches with RAM during memory access.
- How deep it goes
- Defines the transfer unit and distinguishes it from the TLB, but stops short of cache-line layout or performance internals.
- What you can do after
- Evaluate memory behavior by distinguishing cached data transfers from cached address translations.
Read how Rust in Action: Systems programming concepts and techniques explains cache line →
Latency
A cache line is a fixed-size block of memory stored and managed as a unit in a CPU cache.
- How it is used
- Explains how multicore CPU caches maintain a consistent view of shared memory.
- How deep it goes
- Defines a 64-byte example and details MESI states plus read and write transitions, without measuring performance or cache placement.
- Examples
- Uses a 64-byte cached block and follows local reads, memory misses, shared copies, and invalidation during writes.
- What you can do after
- Evaluate/understand cache-line states and coherence actions during multicore reads and writes.
Learn Concurrent Programming with Go
A cache line is a block-sized unit of memory storage that a cache transfers and tracks as a copy of main memory.
- How it is used
- Explains why memory-sharing threads can observe stale values on multiprocessor systems.
- How deep it goes
- Traces cache copies, write-through, bus notifications, invalidation, and the scalability limit called the coherency wall.
- Examples
- Uses shared-variable updates, two processor caches, bus messages, and cache-line invalidation as visual examples.
- What you can do after
- Understand how invalidation helps processors obtain updated shared values and why coherence can constrain scaling.
Read how Learn Concurrent Programming with Go explains cache line →
Related concepts
- false sharingused by · False sharing is a performance problem in which independent data accessed by different threads occupy the same cache line, causing unnecessary cache-coherence traffic when that data is modified.
- CPU cachepart of · A CPU cache is small, fast memory that stores copies of data or instructions for quicker access by a processor.
- hardwareused by · Hardware is the physical equipment and components of a computing system that provide resources for computation and software execution.
- spatial localityused by · Spatial locality is the tendency for memory locations near a recently accessed location to be accessed soon afterward.
These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.