# Simple summation 8x slower than in Julia

**URL:** <https://fortran-lang.discourse.group/t/simple-summation-8x-slower-than-in-julia/1171>\
**Category:** Uncategorized\
**Created:** [May 7, 2021, 8:47pm UTC](https://fortran-lang.discourse.group/t/simple-summation-8x-slower-than-in-julia/1171 "2021-05-07T20:47:48Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![pcosta](https://yyz2.discourse-cdn.com/free1/user_avatar/fortran-lang.discourse.group/pcosta/32/5504_2.png) [@pcosta](https://fortran-lang.discourse.group/u/pcosta)\
**Post date:** [May 7, 2021, 9:04pm UTC](https://fortran-lang.discourse.group/t/simple-summation-8x-slower-than-in-julia/1171/3 "2021-05-07T21:04:06Z")

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Here are my timings with different compilers:

```auto
$ gfortran -Ofast -march=native test.f90 && ./a.out
 Time 1.4684500000000000
   1.7136493465701697

```

```auto
$ ifort -fast -xHost test.f90 && ./a.out
ipo: warning #11021: unresolved __ehdr_start
        Referenced in libc.a(libc-start.o)
 Time 0.699488000000000
   1.71364934657041

```

```auto
$ nvfortran -fast test.f90 && ./a.out                                                                                                                                                       
/usr/bin/ld: warning: /home/pedro/software/nvidia/hpc_sdk/Linux_x86_64/21.3/compilers/lib/nvhpc.ld contains output sections; did you forget -T?
 Time 0.2167658805847168
    1.713649346569483

```

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