Notice: When using the C++ 11/14 standard, you should comment the following code and restore the above commented code, that is, set the compiler option standard to: -std=cxx1z, -std=cxx2a. // C++17…cxx1z //template <class _Iter> //constexpr void* _Voidify_iter(_Iter _It) noexcept { // if constexpr (std::is_pointer<_Iter>::value) { // return const_cast<void*>(static_cast<const volatile void*>(_It)); // } // else { […]
Tag: allocator
32｜Memory management in containers: allocator
In the previous lecture, we discussed the basic tools of memory management in C++, allocation and release functions. Today, let’s discuss the mechanism for managing memory in containers-the allocator. A little history It can be seen from the SGI STL documentation that can be found online that before C++ was standardized, STL had introduced the […]
[C++] Space allocator allocator: principle and underlying analysis
Article directory space configurator First level space configurator Secondary space configurator 1. Memory pool 2. Design of secondary space configurator in SGI-STL – Hash bucket 3. Space application for secondary space configurator Default selection for space configurator Repackaging of spatial configurator: added data type size Construction and destruction of spatial configurator objects allocator in container […]
Summary of C++ map operation functions key_comp, value_comp, find, count, lower_bound, upper_bound, equal_range, get_allocator (207)
Introduction: CSDN blog expert, focusing on Android/Linux System, share multi-mic voice solutions, audio and video, codec and other technologies, and grow with everyone! Quality Column:Audio Engineer Advanced Series[Original information is being updated continuously… ] Life motto: There are never shortcuts in life, only actions It is the only cure for fear and laziness. For more […]
Dynamic Storage Allocator dynamic memory allocator implemented based on C language
Table of contents Chapter 1 Basic information of the experiment – 4 – 1.1 Experimental purpose – 4 – 1.2 Experimental environment and tools – 4 – 1.2.1 Hardware environment – 4 – 1.2.2 Software environment – 4 – 1.2.3 Development Tools – 4 – 1.3 Experiment preview – 4 – Chapter 2 Experiment Preview […]
Linux memory allocator
Buddy System We know that physical memory is managed in units of page frames. If we do not use a memory allocation algorithm to manage memory, consider the following example: I have a 256K continuous memory space (a total of 64 page frames), which must be allocated when allocating memory. Contiguous memory: 1. Apply for […]
mit6.s081 – xv6 physical memory allocator
Core question: How does xv6 manage physical memory? Physical address, virtual address in RISV-V RISC-V instructions (both user and kernel) operate on virtual addresses. Physical memory (RAM) is indexed by physical address. RISC-V’s page table hardware (MMU) links these two types of addresses by mapping each virtual address to a physical address (address mapping). The […]
3. Simple space configurator allocator
Reference text In order to improve the reusability and readability of the code, we can consider separating a special component responsible for memory management (currently only application and release) and object construction and destruction. This is the space configurator (allocator) among the six major components of STL. At present, we first implement the simplest space […]
STL – allocators
C++ memory allocation operation and release operation 1<br>2<br>3<br> class FOO{};<br>FOO *pf = new FOO;<br>delete pf;<br> For the above code, its underlying execution content is: Line 2: new operation, first call ::operator new to allocate memory (2) call Foo::Foo() to construct object content; ::operator new calls malloc to allocate memory at the bottom. line 3: delete […]
Pytorch memory mechanism and memory occupation (1) — theoretical analysis (memory) (activation occupies the largest part of memory during training) (pytorch cache area/cache allocator)
When PyTorch is performing deep learning training, there are 4 major memory overheads, namely ① Model parameters (parameters) ② Gradients of model parameters (gradients) ③ optimizer state (optimizer states) ④ Intermediate activations or intermediate results. Among them, activation accounts for the absolute majority, more than 50% (some places say that the calculation graph occupies the […]