I'm implementing a ioctl in a Windows CE device driver that takes a pointer to a large chunk of application memory to perform asynchronous I/O initiated through an application call to DeviceIoControl. When using MapCallerPtr(), the pointer gets unmapped when the XXX_IOControl function returns; when the pointer is used in the IST it is ...
I want to create a file that only resides in memory... In looking through some documentation I saw a recommendation to use a shell extension as a virtual file. Im not sure that is a workable solution but I would like to know Is it a good approach (or should I be using a ramdisk instead) Where is a good place to start to read up on it...
I am struggling to port a Perl program to Java, and learning Java as I go. A central component of the original program is a Perl module that does string prefix lookups in a +500 GB sorted text file using binary search (essentially, "seek" to a byte offset in the middle of the file, backtrack to nearest newline, compare line prefix with ...
I've been trying to write some very fast Java code that has to do a lot of I/O. I'm using a memory mapped file that returns a ByteBuffer: public static ByteBuffer byteBufferForFile(String fname){ FileChannel vectorChannel; ByteBuffer vector; try { vectorChannel = new FileInputStream(fname).getChannel(); } catch (...
I have a custom file type that is implemented in sections with a header at the shows the offset and length of each section within the file. Currently, whenever I want to interact with the file, I must either load and parse the entire thing up front, or else pick only the sections that I need and load just them. What I would like to do ...
On solaris i can run the pmap command on a core file to get the memory map of a crashed process. Unfortunately the pmap command available on HPUX and Linux doesn't provide this option. Any pointers how i can get this information on these platforms? Thanks! ...
I have a 2GB RAM and running a memory intensive application and going to low available physical memory state and system is not responding to user actions, like opening any application or menu invocation etc. How do I trigger or tell the system to swap the memory to pagefile and free physical memory? I'm using Windows XP. If I run the s...
I'm serializing a large 3d array to disk.The original data is around 50MB and GZiped output is in Kb's size.But the operation takes around 5 sec's.I would like to optimize it for time.I was thinking weather it would be any better to use a mapped read/write since i have seen it has better performance than the usual stream writing.But don...