memory

问题 I work in an area where memory utilization is very important to us, as we don't run on your classic web browsers / hardware. We use null quite a lot in our application, one thing that has not been clear to me is if null takes up more space than assigning a variable to undefined. Do we know if one or the other is more costly on memory usage? Thanks for help! 回答1: As you can see in this jsperf test, null seems to be slightly faster in the chrome (V8, just like nodejs) which might indicate it

问题 I am exceeding the soft memory limit in google app engine (4 to 6 gb, soft limit is set at 2gb) by using this app yaml file: runtime: python37 service: snow instance_class: F4_1G resources: cpu: 1 memory_gb: 16 disk_size_gb: 20 It appears the resources memory_gb is not related to the "soft limit" memory. When booting up my app, I need to train an ML model that takes around 4 to 6gb memory. Is there any other way to increase the memory during app deployment? 回答1: This is because you are trying

问题 I am exceeding the soft memory limit in google app engine (4 to 6 gb, soft limit is set at 2gb) by using this app yaml file: runtime: python37 service: snow instance_class: F4_1G resources: cpu: 1 memory_gb: 16 disk_size_gb: 20 It appears the resources memory_gb is not related to the "soft limit" memory. When booting up my app, I need to train an ML model that takes around 4 to 6gb memory. Is there any other way to increase the memory during app deployment? 回答1: This is because you are trying

问题 I am using a C library which uses raw pointers from C++. Therefore, I'm looking into wrapping all the pointers to C objects in C++ classes and turning them into smart pointers. I've built a working example: #include <iostream> using namespace std; // the C library is oop: using structs and naming conventions. Like this: // C library declarations struct Animal_s { int age; }; typedef struct Animal_s Animal; Animal* make_animal(int age); void free_animal(Animal* animal); Animal* do_something

问题 I am using a C library which uses raw pointers from C++. Therefore, I'm looking into wrapping all the pointers to C objects in C++ classes and turning them into smart pointers. I've built a working example: #include <iostream> using namespace std; // the C library is oop: using structs and naming conventions. Like this: // C library declarations struct Animal_s { int age; }; typedef struct Animal_s Animal; Animal* make_animal(int age); void free_animal(Animal* animal); Animal* do_something

问题 I made a application that runs on a coffee machine. After 20+ days (can be 60+ days depending on use) an OutOfMemoryError occurs: java.lang.OutOfMemoryError: Failed to allocate a 604 byte allocation with 16777216 free bytes and 319MB until OOM; failed due to fragmentation (required continguous free 65536 bytes for a new buffer where largest contiguous free 53248 bytes) My question is: Is there a way to run a defragmentation on memory android application programmatically? The time it takes

问题 int a[] = {1, 2 ,3}; I understand that array names are converted to pointers. A term often used is that they decay to pointers. However to me, a pointer is a region of memory that holds the address to another region of memory, so: int *p = a; can be drawn like this: ----- ----- p ---------> a[0]. ..... ----- ----- 0x1 0x9 But a itself is not pointing to another region of memory, it IS the region of memory itself. So when the compiler converts it to a pointer, does it save it (like p )

问题 Once I have allocated the array, how do I manually free it? Is pointer arithmetic possible in unsafe mode? Like in C++: double *A=new double[1000]; double *p=A; int i; for(i=0; i<1000; i++) { *p=(double)i; p++; } delete[] A; Is there any equivalent code in Rust? 回答1: Based on your question, I'd recommend reading the Rust Book if you haven't done so already. Idiomatic Rust will almost never involve manually freeing memory. As for the equivalent to a dynamic array, you want Vector. Unless you

问题 Once I have allocated the array, how do I manually free it? Is pointer arithmetic possible in unsafe mode? Like in C++: double *A=new double[1000]; double *p=A; int i; for(i=0; i<1000; i++) { *p=(double)i; p++; } delete[] A; Is there any equivalent code in Rust? 回答1: Based on your question, I'd recommend reading the Rust Book if you haven't done so already. Idiomatic Rust will almost never involve manually freeing memory. As for the equivalent to a dynamic array, you want Vector. Unless you

问题 Once I have allocated the array, how do I manually free it? Is pointer arithmetic possible in unsafe mode? Like in C++: double *A=new double[1000]; double *p=A; int i; for(i=0; i<1000; i++) { *p=(double)i; p++; } delete[] A; Is there any equivalent code in Rust? 回答1: Based on your question, I'd recommend reading the Rust Book if you haven't done so already. Idiomatic Rust will almost never involve manually freeing memory. As for the equivalent to a dynamic array, you want Vector. Unless you