Hi, with GMP 5.0.0 and MPFR, it is possible to compute 10^9 bits of Pi in less than one hour on a 2.83Ghz Core 2: patate% time ./tconst_pi 1000000000 0 0 Seed GMP_CHECK_RANDOMIZE=1263667646 (include this in bug reports) 2885.349u 192.229s 52:16.55 98.1% 0+0k 280+16io 3pf+0w Paul Zimmermann