How do I determine the size of an object in Python? The answer, “Just use sys.getsizeof“, is not a complete answer. That answer does work for builtin objects directly, but it does not account for what those objects may contain, specifically, what types, such as custom objects, tuples, lists, dicts, and sets contain. They can contain instances each … Read more
I’ve found a workaround. At first it seemed it would take up more time, but it actually makes everything work smoother and faster due to less swapping and more memory available. This is not a scientific approach and it needs some testing before it works. In the code, make Excel save the workbook every now … Read more
I also faced this issue with my Ubuntu 14.04 desktop. Even these basic command showed Can’t allocate memory error. On investigating, found that system is using all the memory for Caching and is not freeing up memory. This is called Cache Ballooning and solved this by clearing the cache.
Your code has undefined behaviour because you are trying to assign l from an uninitialised array str. I’m guessing you got your functions confused and meant to write the opposite That code assigns l to str. Use the following code to work out how big str needs to be
he guarantee you get is that sizeof(char) == 1. There are no other guarantees, including no guarantee that sizeof(int *) == sizeof(double *). In practice, pointers will be size 2 on a 16-bit system (if you can find one), 4 on a 32-bit system, and 8 on a 64-bit system, but there’s nothing to be gained in … Read more
Rewrite to and this will use much less memory. Whereas p = p*alpha allocates a whole new matrix for the result of p*alpha and then discards the old p; p*= alpha does the same thing in place. In general, with big matrices, try to use op= assignment.
A byte is a memory unit for storage A memory chip is full of such bytes. Memory units are addressable. That is the only way we can use memory. In reality, memory is only byte addressable. It means: A binary address always points to a single byte only. A word is just a group of bytes – 2, 4, 8 depending upon the data bus size of the CPU. To understand the memory operation fully, you must be familiar with the various registers of the CPU and the memory ports of the RAM. I assume … Read more
This one has been answered already here: Python memory profiler Basically you do something like that (cited from Guppy-PE):
Python can handle arbitrarily large integers in computation. Any integer too big to fit in 64 bits (or whatever the underlying hardware limit is) is handled in software. For that reason, Python 3 doesn’t have a sys.maxint constant. The value sys.maxsize, on the other hand, reports the platform’s pointer size, and that limits the size of Python’s data … Read more
This one here: seems to be very inefficient and expensive for large strings. Better do A buffer object keeps a reference to the original string and start and length attributes. This way, no unnecessary duplication of data occurs. A string of length l has l*l/2 sub strings of average length l/2, so the memory consumption would roughly be l*l*l/4. With a … Read more