On Thursday 24 February 2005 3:16 pm, Brad Bourn wrote:
I am making a lib that process statistics/odds
It does a TON of conditional processing and makes extensive use of STL.
I used to be able to process about 1200 sets of numbers / second.
I added a bunch code and comments all over the place for debugging information out to the console. When running in debug it is EXTREMELY slow, which is acceptable. When running without the debug statements it is now at about 300 sets/second. (I added a bunch of complication and recursive functions which slowed it down). I had setup a bunch of if statements to see if I'm in debug mode or not so it doesn't write out to the console if not. By commenting out all the if statements in one recusive function gives me about 100 sets/second more.
my question is this
is there a way to define "//" to be replaced?
e.g.
// how it is now if(debug) qDebug("this");
// what I'd like
#define DEBUG_PRINT // //#define DEBUG_PRINT qDebug
DEBUG_PRINT("this");
If I use #ifdef 's then the code is hard to read e.g.
for(x) { for(y) { for(z) { #ifdef DEBUG qDebug("here I am"); #endif somestatment(blah); andanotherone(blah); if(somehting) { #ifdef DEBUG qDebug("here I am again"); #endif conditional(blah); } } } } There are so many ways to do it. First, remember that gcc's default optimization is no optimization. Also, remember that when using recursion, you are using a lot of stack. And also remember that the STL uses a lot of memory. You need to be very careful that your destructors get called. Here is something quick (from a Cish point of view) #if defined DEBUG #define qDebug(arg1, arg2, ..., argn) \ fprintf(stderr, "%s, %s, %s, ... %s\n") #else #define qDebug(arg1, arg2, ..., argn) /* */ #endif
In this case, if DEBUG is defined, then you get qDebug if not you get an
empty comment. Another way to do this is to define a debug class such as:
DeBug << "....." << ....;
The when not debugging you can have a non-debug class that is effectively
empty. Make the constructors and member functions inline.
--
Jerry Feldman