I've been tasked with reconciling two big data sets (two big lists of transactions). Basically i extract the relevant fields from the two data sources into two files of the same format, then compare the files to find any records that are in A but not in B, or vice versa, and report on them. I wrote a blog entry on my best efforts achievi...
Take a look at these two functions: void function1() { int x; int y; int z; int *ret; } void function2() { char buffer1[4]; char buffer2[4]; char buffer3[4]; int *ret; } If I break at function1() in gdb, and print the addresses of the variables, I get this: (gdb) p &x $1 = (int *) 0xbffff380 (gdb) p...
I write a C program gets in an environment variable's name and print out it's memory address, simply use the getenv() function to do the job. Let's say I wanna have the address location of PATH --> ./test PATH. But when I debug that program in gdb, the memory location of that variable is different. Can you explain in detail why is there ...
Hello I am trying to code a custom url_rewriter for squid. & also with using some other url_rewriter programs like squidGuard so have to use a wrapper to able use both or any other program. when i try to loop with php. (that's the way how squid communicates with external programs. STDIN/STDOUT. it gives you a url & you have to sen...
Java - or at least Sun's Hotspot JVM - has long had a reputation for having a very large memory footprint. What exactly is it about the JVM that gives it this reputation? I'd be interested in a detailed breakdown: how much memory goes to the runtime (the JIT? the GC/memory management? the classloader?) anything related to "auxiliary" A...
Hi all, I am developing a multi-tenant web application using LAMP. All my user session data is currently stored in mysql with table type InnoDB. Is there any way that I can use MEMORY (used to be HEAP) table type to store the current sessions and use the garbage collector function of the session handler to move sessions between the Inn...
I am wondering why I'm not able to allocate more that 1,000 MB of memory in my 32-bit .NET process. The following mini application throws an OutOfMemoryException after having allocated 1,000 MB. Why 1,000 MB, and not say 1.8 GB? Is there a process-wide setting I could change? static void Main(string[] args) { ArrayList list = new Ar...
I have a memory block that is divided into a series of location that can be retrieved and returned by client code. The method that returns locations back looks like this: void ReturnLocation(void *address) { int location = AddressToLocation(address); // I need the location here // some code DoSmthA(location); } void DoSmth...
I thought about the following question about computer's architecture. Suppose I do in Python from bisect import bisect index = bisect(x, a) # O(log n) (also, shouldn't it be a standard list function?) x.insert(index, a) # O(1) + memcpy() which takes log n, plus, if I correctly understand it, a memory copy operation for x[...
Has anyone seen this error when working with a PHP application "out of dynamic memory in yy_create_buffer()"? The error message that appears in the php error log is: Fatal error: out of dynamic memory in yy_create_buffer() in Unknown on line 0 I have not been able to identify a reproducible case. Increasing memory_limit has no affect o...
I have data object class: @interface Item: NSObject { NSString *title; NSString *text; } @property (copy) NSString *title; @property (copy) NSString *text; @end @implementation Item @synthesize text; - (void)updateText { self.text=@"new text"; } - (NSString *)title { return title; } - (void)setTitle:(NSString *)aS...
int[] myIntegers; myIntegers = new int[100]; In the above code, is new int[100] generating the array on the heap? From what I've read on CLR via c#, the answer is yes. But what I can't understand, is what happens to the actual int's inside the array. As they are value types, I'd guess they'd have to be boxed, as I can, for example, pas...
Hi; It's a known fact that Windows applications usually have 2Gb of private addess space on a 32bit system. This space can be extended to 3Gb with the /3Gb switch. The operating system reserves itself the remaining of the 4Gb. My question is WHY? Code running in kernel mode (ie device driver code) has its own address space. Why, on t...
I'm working on a GUI in SDL. I've created a slave/master class that contains a std::list of pointers to it's own slaves to create a heirarchy in the GUI (window containing buttons. Button a label and so on). It worked fine for a good while, until I edited a completely different class that doesn't effect the slave/master class directly. T...
Is there a way to prevent the PHP GD image library from running out of memory? If too large an image is uploaded, GD tends to run out of memory, terminating the script. I'd like it to throw a catchable exception or something to that extend, but alas it doesn't. Right now I'm using a cobbled-together script that first issues an ini_set('...
Just reading some notes in a purdue lecture about OSs, and it says: A program sees memory as an array of bytes that goes from address 0 to 2^32-1 (0 to 4GB-1) Why 4 GB? ...
How can I calculate the amount of free virtual address space my process have on Windows? My application need to limit the amount of address space used. So I need to estimate how many memory I have consumed and how many virtual memory is left. If I have just a few hundred megabytes of address space left, my process begins to use a custo...
I encountered a crash in my game, here's the crash log (it's a stress test): PID RPRVT RSHRD RSIZE Command 1 340K 224K 436K launchd 14 124K 160K 216K update 15 568K 164K 620K syslogd 16 792K 612K 1.16M lockdownd 17 2.22M 664K 3.04M mediaserverd 18 296K 160K 440K mDNSResponder 20 540...
I have an applet which needs more or less memory depending on how many data the client has. We usually recommend to use Java 1.6 latest version, but we actually support Java 1.5+ so we have a protection in the applet which shows a dialog box with a warning about "not enough memory" and instructions where to go to increase the memory. H...
I'm working on a Java application that needs to communicate with a C application. The C application uses shared memory and mmap to communicate, and I need the Java application to have access to the same memory. My first attempt involved using JNI calls to retrieve data from the shared memory, but the overhead of each JNI call killed per...