Tag: memory
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Most referenced — #memory
Memory Leaks — Closures, Detached DOM 3WeakRef & FinalizationRegistry 2Object Pooling 2Garbage Collection 2__slots__ & Memory Optimisation 1Out of Memory Errors (memory_limit) 1Memory Management — Stack vs Heap 1PHP Garbage Collection Internals (Cycle Collector) 1
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Memory Pressure Detection PHP 7.0+
Proactively identifying when a PHP process approaches its memory limit so corrective action can be taken before a fatal error.
3d ago
performance intermediate
Memory Management in JavaScript
JavaScript uses automatic garbage collection — the engine reclaims memory when objects are no longer reachable. Memory leaks occur when references are unintentionally retained, preventing collection.
4w ago
javascript intermediate
Memory-Mapped Files
A file mapped directly into a process's virtual address space — reads and writes go through the OS page cache rather than read()/write() syscalls, enabling fast access to large files and shared memory between processes.
1mo ago
linux advanced
PHP Generators PHP 5.5+
Functions using yield that produce values lazily — one at a time — instead of building a complete array in memory.
1mo ago
php intermediate
Copy-on-Write (CoW) in PHP Arrays PHP 7.0+
PHP arrays are not copied when assigned or passed to functions — they share the same internal buffer until one copy is modified. Only then does PHP perform a real copy. This makes reading large arrays cheap but silent mutations expensive.
2mo ago
php intermediate
Generators & yield (PHP 5.5) PHP 5.5+
Generators (PHP 5.5) use yield to produce values lazily — enabling memory-efficient iteration over large datasets without loading everything into memory.
2mo ago
php intermediate
Memory Exhaustion PHP 4.0+
PHP's Allowed Memory Size Exhausted fatal error — caused by loading too much data into memory at once, unbounded loops accumulating objects, or memory leaks in long-running processes.
2mo ago
php intermediate
PHP Garbage Collection Internals (Cycle Collector) PHP 5.3+
PHP uses reference counting as its primary memory management strategy — when a value's reference count drops to zero it is freed immediately. A secondary cycle collector handles circular references that reference counting alone cannot free.
2mo ago
php advanced
PHP Memory Model — Zval & Copy-on-Write PHP 7.0+
PHP stores every value in a zval (Zend value) container that holds the type, value, and a reference count. Arrays and strings are copied lazily — the copy only happens when one copy is modified (copy-on-write), making passing large values cheap until mutation.
2mo ago
php advanced
Circular References & Memory Implications PHP 5.3+
Circular references between objects prevent PHP's reference counting GC from freeing memory — PHP's cycle collector handles them but with overhead.
2mo ago
php intermediate
Memory Leaks — Closures, Detached DOM ES2015
JavaScript memory leaks occur when references are accidentally retained — common causes: closures holding large objects, detached DOM nodes, forgotten event listeners, and growing Maps/Sets.
2mo ago
javascript advanced
Out of Memory Errors (memory_limit) PHP 5.0+
PHP enforces memory_limit in php.ini — exceeding it triggers a fatal E_ERROR that cannot be caught with set_error_handler().
2mo ago
php intermediate
__slots__ & Memory Optimisation Python 3.0+
Declaring __slots__ on a class prevents the dynamic __dict__ per instance — reducing memory usage by 40-60% for classes with many instances.
2mo ago
python intermediate
Memory Management — Stack vs Heap PHP 5.0+
The stack holds function call frames with fixed-size local variables — fast, automatic, limited. The heap holds dynamically allocated objects — flexible, managed by GC, slower.
2mo ago
compiler intermediate
WeakRef & FinalizationRegistry ES2021
WeakRef holds a weak reference allowing GC to collect the object — used for memory-safe caches. FinalizationRegistry runs a callback when an object is collected.
2mo ago
javascript advanced
Flyweight Pattern
A structural pattern that shares common state between many objects rather than storing it in each instance — dramatically reducing memory for large numbers of similar objects.
2mo ago
quality advanced
Garbage Collection PHP 5.3+ Automatic memory management that reclaims objects no longer reachable by the program — PHP uses reference counting with a cycle collector for circular references.
2mo ago
compiler advanced
Generators & yield PHP 5.5+ Generators allow iterating over large datasets lazily using yield, without loading everything into memory at once.
2mo ago
php intermediate
Memory Leak PHP 5.0+
Memory allocated during execution that is never released, causing PHP processes to grow until they exhaust available memory or are restarted.
2mo ago
performance intermediate
Object Pooling PHP 7.0+
Reusing a fixed set of pre-initialised expensive objects rather than creating and destroying them on every request — reducing allocation overhead.
2mo ago
performance advanced