heap-memory

问题 Sorry for the bad question name but i couldn't find anything better. I have some code long heapFreeSize = Runtime.getRuntime().freeMemory(); URL url = new URL("http://example.com"); URLConnection myUrlConnection = url.openConnection(); GZIPInputStream gZIPInputStream = new GZIPInputStream(myUrlConnection.getInputStream()); StringBuffer decompressedStringBuffer = new StringBuffer(); int bytes_read; int bufferSize; heapFreeSize = Runtime.getRuntime().freeMemory(); while ((bytes_read =

问题 Finished implementing the minimal Heap structure with awesome help from Micheal . Right now I have one thing missing so it dynamically grows. As you can see in this image, it isn't dynamic: Instead of having a fixed size when I do pmm_map_physical_virtual(0x800000,0xC0800000) , the max I can go to is 8MB which is from 0xC00000000-0xC0800000 ... but then I have to be aware not to overwrite the kernel, so I will technically have less than 8MB . Is there a way so that the heap just continues

问题 Finished implementing the minimal Heap structure with awesome help from Micheal . Right now I have one thing missing so it dynamically grows. As you can see in this image, it isn't dynamic: Instead of having a fixed size when I do pmm_map_physical_virtual(0x800000,0xC0800000) , the max I can go to is 8MB which is from 0xC00000000-0xC0800000 ... but then I have to be aware not to overwrite the kernel, so I will technically have less than 8MB . Is there a way so that the heap just continues

问题 Finished implementing the minimal Heap structure with awesome help from Micheal . Right now I have one thing missing so it dynamically grows. As you can see in this image, it isn't dynamic: Instead of having a fixed size when I do pmm_map_physical_virtual(0x800000,0xC0800000) , the max I can go to is 8MB which is from 0xC00000000-0xC0800000 ... but then I have to be aware not to overwrite the kernel, so I will technically have less than 8MB . Is there a way so that the heap just continues

问题 Finished implementing the minimal Heap structure with awesome help from Micheal . Right now I have one thing missing so it dynamically grows. As you can see in this image, it isn't dynamic: Instead of having a fixed size when I do pmm_map_physical_virtual(0x800000,0xC0800000) , the max I can go to is 8MB which is from 0xC00000000-0xC0800000 ... but then I have to be aware not to overwrite the kernel, so I will technically have less than 8MB . Is there a way so that the heap just continues

问题 I am new to Rust and reading The Rust Programming Language , and in the Error Handling section there is a "case study" describing a program to read data from a CSV file using the csv and rustc-serialize libraries (using getopts for argument parsing). The author writes a function search that steps through the rows of the csv file using a csv::Reader object and collect those entries whose 'city' field match a specified value into a vector and returns it. I've taken a slightly different approach

问题 We tune our GC for minimum "stop-the-world" pauses. Perm and Tenured generations behave well. Young works fine most of the time, and the pauses usually don't exceed 500ms (note [Times: user=0.35 sys=0.02, real=0.06 secs]): {Heap before GC invocations=11603 (full 60): par new generation total 3640320K, used 3325226K [0x0000000600000000, 0x00000006f6e00000, 0x00000006f6e00000) eden space 3235840K, 100% used [0x0000000600000000, 0x00000006c5800000, 0x00000006c5800000) from space 404480K, 22%

问题 What happens in memory when there is a class with 50 methods and we create 50 object instances of that class? What is the best solution for having an object with a lot of functionality and less memory usage? 回答1: Yes, C#/.Net methods require memory on per-AppDomain basis, there is no per-instance cost of the methods/properties. Cost comes from: methods metadata (part of type) and IL. I'm not sure how long IL stays loaded as it really only needed to JIT so my guess it is loaded as needed and

问题 What happens in memory when there is a class with 50 methods and we create 50 object instances of that class? What is the best solution for having an object with a lot of functionality and less memory usage? 回答1: Yes, C#/.Net methods require memory on per-AppDomain basis, there is no per-instance cost of the methods/properties. Cost comes from: methods metadata (part of type) and IL. I'm not sure how long IL stays loaded as it really only needed to JIT so my guess it is loaded as needed and

问题 This question already has answers here : How to determine CPU and memory consumption from inside a process? (9 answers) Closed 2 years ago . See, I wanted to measure memory usage of my C++ program. From inside the program, without profilers or process viewers, etc. Why from inside the program? Measurements will be done thousands of times—must be automated; therefore, having an eye on Task Manager , top , whatever, will not do Measurements are to be done during production runs —performance