Well designed test shows that first function is slowest on Python 2.x (mostly because two lists have to be created, first one as a increasing range, second one as a reverted first one). I also included a demo using reversed. from __future__ import print_function import sys import timeit def iterate_through_list_1(arr): lala = None for i … Read more
Yes, functions are located in a specific place in memory. In the context of Virtual Memory (opposed to physical caches), they are stored below the Heap and below a section called the Data (global variables) in a section called Text. All of this is loaded up when the executable is read; this is all done … Read more
A function that returns an allocated pointer means that ownership of that memory is being transferred to the caller of that function. It is up to the code that receives the returned pointer to deallocate the memory. While using malloc() and free() in C++ is not entirely without precedent, it should generally be avoided. You … Read more
My guess without a code example is that you were operating on the buffer or struct you malloc’d with assumptions that its contents would be initialized with certain default values. Malloc doesn’t initialize the memory it hands back, so unless you memset or use some other initialization, the values in that memory could be anything, … Read more
this keyword is used to reference current instance of given class, for example: class A { public: void setName(std::string name) { // if you would use name variable directly it // will refer to the function parameter, //hence to refer the field of the class you need to use this this->name = name; } private: … Read more
Distributed Computing Economics written by Jim Gray in 2003 is a good start. See this quote: From this we conclude that one dollar equates to = 1 $ ≈ 1 GB sent over the WAN ≈ 10 Tops (tera cpu operations) ≈ 8 hours of cpu time ≈ 1 GB disk space ≈ 10 M … Read more
Thank you all very much for your input. Actually the first thing i should have checked was at fault, being the HDD, which wasn’t able to provide the needed datarate. I’m now thinking about switching to a SSD – Device. solved Slowdown when reading big file randomly with C++
This is not “pure C” question, because C language standard doesn’t define how to access physical, linear or virtual memory at given address. In many or most environments, operating system won’t never let you directly access physical memory, or will only let you access physical memory if you ask it. For example on Linux with … Read more
You dont need to worry about memory leaks, in your case you use std::vector which uses RAII to make sure no memory is leaked. With STL containers you can “leak” in such case on;y if you do not shrink your vector after using remove algorithm. Below is fix to your code, and not entire rewrite. … Read more
Your example code should not give any errors as was proved by Robert Crovella. I looked at your original code and found a misaligned parenthesis cause by that first “for” loop. Good luck… 0 solved CUDA: Using a global thread index with shared memory won’t work [closed]
Is there any reason why declaring a variable default outside of a method would be better or worse than defining a default in a no-arg constructor [closed] solved Is there any reason why declaring a variable default outside of a method would be better or worse than defining a default in a no-arg constructor [closed]
Constants are stored in various places: Constants may be stored in a designated section of memory that is marked read-only for the program. In general-purpose systems, this is not ROM. ROM is physically read-only memory. ROM is typically used in special-purpose systems where the software is set prior to manufacturing the hardware (or at least … Read more
To measure the actual power consumption you should use add an electricity meter to your power supply (remove the batteries if using a notebook). Note that you will measure the power consumption of the entire system, so make sure to avoid nuisance parameters (any other system activity, i.e. anti-virus updates, graphical desktop environment, indexing services, … Read more
Since you said you use dll_export, the cause of corruption can be one or more of the following: The application and DLL were not compiled with the same compiler options in terms of code generation. The application and DLL are using different heaps at runtime. For the first item, you must make sure that the … Read more
When you merge your dataframes, you are doing a join on values that are not unique. When you are joining all these dataframes together, you are getting many matches. As you add more and more currencies you are getting something similar to a Cartesian product rather than a join. In the snippet below, I added … Read more