memory

问题 I am looking for a memory stream implementation in Java. The implementation should be roughly modeled after the .NET memory stream implementation. Basically I would like to have a class MemoryStream which has to factory methods: class MemoryStream { MemoryInput createInput(); MemoryOutput createOutput(); } class MemoryInput extends InputStream { long position(); void seek(long pos); } class MemoryOutput extends OutputStream { long position(); void seek(long pos); } So once I have an instance

问题 I am looking for a memory stream implementation in Java. The implementation should be roughly modeled after the .NET memory stream implementation. Basically I would like to have a class MemoryStream which has to factory methods: class MemoryStream { MemoryInput createInput(); MemoryOutput createOutput(); } class MemoryInput extends InputStream { long position(); void seek(long pos); } class MemoryOutput extends OutputStream { long position(); void seek(long pos); } So once I have an instance

问题 There is big file. I need fast sort it. I going to process the file by part, that fit in RAM, to avoid/degrees using page file (next step: merge parts). How to use max RAM? My solution: use WinApi file memory mapping, but I don't knew how to get part of file maximum size, but fit RAM (how to determine size)? 回答1: You can VirtualLock the pages you want to process. It locks in physical memory the size you need (if there is enough) swapping others to the paging file. You can use the

问题 Please consider the following code: char **ptr; str = malloc(sizeof(char *) * 3); // Allocates enough memory for 3 char pointers str[0] = malloc(sizeof(char) * 24); str[1] = malloc(sizeof(char) * 25); str[2] = malloc(sizeof(char) * 25); When I use some printf to print the memory adresses of each pointer: printf("str[0] = '%p'\nstr[1] = '%p'\nstr[2] = '%p'\n", str[0], str[1], str[2]); I get this output: str[0] = '0x1254030' str[1] = '0x1254050' str[2] = '0x1254080' I expected the number

问题 I know how to show picture as a page from memory just using like this: import cStringIO mStream = cStringIO.StringIO(picBin) return HttpResponse(mStream.getvalue(),"image/jpg") But what if I don't want to show the picture as a page, instead I want to show it within a page, say using in HTML, does someone has an idea what I should set the "src" if the picture is loaded from memory? 回答1: You'll need to base-64 encode the image contents into a Data URI: data_uri = 'data:image/jpg;base64,' data

问题 I'm just checking to make sure I have a proper understanding of how memory access works. Say I have a word-addressable memory system with 64-bit words. How much memory could be accessed using a 32-bit address size? A 64 bit word is 8 bytes, so we're dealing with an 8 byte word. An 8 byte word can hold up to 2^8 (256). Given that we have a 32 bit address, we have 2^32, but since each word is taking up 256 of those, (2^32)/256 = 1677216 bytes. To put that into metric terms, we have 2^24 = (2^4)

问题 I have an application that uses a 3rd party API and I think they are having a memory leak issue. I wrote a small test program (below) to test this out, please note, both VMIListener and VMI are from the APIs in which I'm implementing their virtual interface methods. I don't have any memory leak behavior if I comment out the VMI vmi; under my VMITest class. With my limited knowledge in C++ I assume this is because the virtual VMI class does not have the virtual destructor. However, my question

问题 So I am learning how x86 works and have come across people saying that it is byte-addressable, yet can read words, double words, etc. How does the processor decide which method to use and when? E.g. for accessing the next instruction and when a user wants to read/write to memory, which addressing mode is used? 回答1: Every memory access has an operand-size specified by the machine-code instruction. (Addressing mode isn't the right term: different addressing modes are different ways of

问题 Sieve of Eratosthenes memory constraint issue Im currently trying to implement a version of the sieve of eratosthenes for a Kattis problem, however, I am running into some memory constraints that my implementation wont pass. Here is a link to the problem statement. In short the problem wants me to first return the amount of primes less or equal to n and then solve for a certain number of queries if a number i is a prime or not. There is a constraint of 50 MB memory usage as well as only using

问题 I'm trying to start a new jvm with the command: java -version , but it report a error: # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (malloc) failed to allocate 160088 bytes for AllocateHeap # An error report file with more information is saved as: # /users/xxx/xxx/hs_err_pid12365.log Then I checked file /users/xxx/xxx/hs_err_pid12365.log , and I find out it say: # Native memory allocation (malloc) failed to allocate 295856 bytes for