Comments (4)
clear() definitely releases the memory. Depending on the platform you are using (Windows?), you may not notice that the memory has been freed, but it has. For example if, after calling clear(), you create a second hash table with the same elements, the memory usage should not increase.
from sparsepp.
I'm using Linux and Solaris.
The behaviour, respect to memory management, is very similar to std::unordered_map
:
seems that the memory is not released to OS after a clear. This is correct in many scenarios but there are some cases that could be usefull to clear and release all the memory back to OS.
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No C++ standard library class or function returns memory "back to the OS". The best C++ classes/methods can do is call delete (which is likely to call free), releasing memory back to the dynamic memory allocator. Whether the dynamic memory allocator releases the memory back to the OS is an implementation detail, not visible from C++.
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ok thanks for this clarification
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Related Issues (20)
- Support operator[] with rvalue HOT 1
- When hashing on vector HOT 13
- Help me to serialize/deserialize sparse_hash_map<int , vector< std::string > > HOT 1
- missing return value in function spp_sptr& operator=(spp_sptr &&o) ? HOT 1
- SIGSEGV on using move-assigned-from hash set HOT 3
- Unable to create map for value type with deleted copy constructor HOT 2
- Can't insert std::tuple: spp uses deleted constructor/destructor HOT 1
- Lookup non-present keys becomes very slow. HOT 1
- Do you support C++11 stateful allocators? HOT 1
- Default allocator doesn't throw and caller doesn't check for NULL HOT 1
- SEGV after moving hash_map HOT 2
- conan package HOT 2
- sparse_hash_map<uint32_t, uint64_t> takes more memory than sparse_hash_map<uint64_t, uint64_t> HOT 1
- memcpy can happen with null "source" parameter HOT 6
- class-memaccess warning when compiling with GCC 8 or later HOT 1
- Problem when compiling on macOS catalina HOT 6
- Can sparse_hash_map support unique_ptr?
- Compiler warning on realloc call within sparsepp. HOT 1
- Error when compile: is not a special member function which can be defaulted HOT 2
- Missing return value. HOT 2
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