Memory usage in flint tests should not exceed 400000 where possible about flint

[wbhart]

Here is a list of functions (thanks to Dan Grayson) which currently exceed this limit (there may be others: ulimit -v 400000 will catch them):

    fft/test/t-fft_ifft_mfa_truncate_sqrt2.c
    fft/test/t-fft_ifft_truncate_sqrt2.c
    fft/test/t-mul_fft_main.c
    fft/test/t-mul_mfa_truncate_sqrt2.c
    fft/test/t-mul_truncate_sqrt2.c
    fmpz_mod_poly/test/t-compose_horner.c
    fmpz_poly/test/t-mul_SS.c
    nmod_mat/test/t-mul_strassen.c
    nmod_poly/test/t-div_series.c
    nmod_poly/test/t-exp_series.c
    nmod_poly/test/t-gcd_hgcd.c
    nmod_poly/test/t-xgcd.c
    nmod_poly/test/t-xgcd_hgcd.c
    nmod_poly_factor/test/t-factor.c
    nmod_poly_factor/test/t-factor_cantor_zassenhaus.c

[fredrik-johansson]

Weird. I put a SHOW_MEMORY_USAGE in nmod_poly/test/t-exp_series.c and it only shows a maximum memory usage of 22 MB. Valgrind also doesn't show a memory leak.

[wbhart]

ulimit -v 400000 only caught one function in this list, for me. I fixed that one case by stopping the test before the final (largest) test cases, as the memory usage was a bit ridiculous. But I can't replicate this in the other cases.