From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marco Morandini To: gcc@gcc.gnu.org Subject: A user question (was: Re: Faster compilation speed) Date: Tue, 13 Aug 2002 10:34:00 -0000 Message-id: <3D5943EB.5080208@aero.polimi.it> X-SW-Source: 2002-08/msg00759.html I'm a simple user, so please forgive me if I'm asking something obvious. With Version 1 of the code below the compile time at -O2 is approx a quadratic function of the number of call to pippo(a); With Version 2 of the code the compile time is approx a linear function of N. Is this reasonable? On a 650MHz PIII with 512 Mb of memory I get the following timings for Version 1: N seconds 1000 1.1 10000 16 20000 49 30000 92 40000 186 After that, with 50000 lines of code, g++ eats all the memory, and goes to swap. gcc -v Reading specs from /home2/marco/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs Configured with: ../configure --enable-threads --enable-languages=c,c++,f77 --prefix=/home2/marco/local Thread model: posix gcc version 3.1 Thanks, and apologize again if this is only noise. Marco Version 1 ------------------- class A{ private: double c; public: virtual ~A(); }; void dummy(const A&a); int main(void) { A a; pippo(a); . . //repeat this line N times . . pippo(a); return 0; } ------------------- Version 2 ------------------- void dummy(const double&a); int main(void) { double a; pippo(a); . . //repeat this line N times . . pippo(a); return 0; } -------------------