------- Comment #2 from jvdelisle at gcc dot gnu dot org 2008-10-07 03:58 ------- strace shows no difference in number of system calles between 4.3 and 4.4.
gprof has some interesting things to see. With 4.4: % cumulative self self total time seconds seconds calls ms/call ms/call name 30.93 0.54 0.54 data_transfer_init 8.67 0.69 0.15 fflush 8.09 0.83 0.14 get_external_unit 6.94 0.95 0.12 finalize_transfer 6.65 1.06 0.12 next_char 6.36 1.17 0.11 fd_read 3.47 1.23 0.06 memcpy 2.60 1.28 0.05 _gfortran_st_read 2.31 1.32 0.04 fd_sfree With 4.3: % cumulative self self total time seconds seconds calls ms/call ms/call name 26.25 0.42 0.42 data_transfer_init 12.50 0.62 0.20 fflush 9.38 0.77 0.15 finalize_transfer 6.25 0.87 0.10 1 100.00 100.00 MAIN__ 6.25 0.97 0.10 get_external_unit 5.94 1.07 0.10 next_char 4.69 1.14 0.08 _gfortran_st_read 2.81 1.19 0.05 fd_alloc_r_at 2.50 1.23 0.04 _gfortrani_library_start 2.19 1.26 0.04 _gfortran_st_read_done I will try some of my more aggressive I/O tests and report back. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37754
