Tag: memory
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Most referenced — #memory
__slots__ & Memory Optimisation 1Memory Management — Stack vs Heap 1Object Pooling 1Garbage Collection 1Generators & yield 1Memory-Mapped Files 1PHP Generators 1Memory Pressure Detection 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.
2mo 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.
3mo 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.
3mo ago
Linux advanced
PHP Generators
PHP 5.5+
1
Functions using yield that produce values lazily — one at a time — instead of building a complete array in memory.
3mo ago
PHP intermediate
Copy-on-Write (CoW) in PHP Arrays
PHP 7.0+
1
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.
3mo 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.
3mo ago
PHP intermediate
Memory Exhaustion
PHP 4.0+
1
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.
3mo ago
PHP intermediate
PHP Garbage Collection Internals (Cycle Collector)
PHP 5.3+
1
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.
3mo ago
PHP advanced
PHP Memory Model — Zval & Copy-on-Write
PHP 7.0+
2
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.
3mo ago
PHP advanced
Circular References & Memory Implications
PHP 5.3+
1
Circular references between objects prevent PHP's reference counting GC from freeing memory — PHP's cycle collector handles them but with overhead.
3mo 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.
3mo 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().
3mo ago
PHP intermediate
__slots__ & Memory Optimisation
Python 3.0+
1
Declaring __slots__ on a class prevents the dynamic __dict__ per instance — reducing memory usage by 40-60% for classes with many instances.
3mo ago
Python intermediate
Memory Management — Stack vs Heap
PHP 5.0+
2
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.
3mo 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.
3mo 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.
3mo ago
Code Quality advanced
Garbage Collection
PHP 5.3+
4
Automatic memory management that reclaims objects no longer reachable by the program — PHP uses reference counting with a cycle collector for circular references.
3mo ago
Compiler advanced
Generators & yield
PHP 5.5+
2
Generators allow iterating over large datasets lazily using yield, without loading everything into memory at once.
3mo ago
PHP intermediate
Memory Leak
PHP 5.0+
11
Memory allocated during execution that is never released, causing PHP processes to grow until they exhaust available memory or are restarted.
3mo 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.
3mo ago
Performance advanced