# Learning coarrays, collective subroutines and other parallel features of Modern Fortran

**URL:** <https://fortran-lang.discourse.group/t/learning-coarrays-collective-subroutines-and-other-parallel-features-of-modern-fortran/1146>\
**Category:** Help\
**Created:** [May 3, 2021, 7:24pm UTC](https://fortran-lang.discourse.group/t/learning-coarrays-collective-subroutines-and-other-parallel-features-of-modern-fortran/1146 "2021-05-03T19:24:45Z")\
**Posts on this page:** 1\
**Showing post:** 18

<div class="post-metadata">

**Author:** ![sblionel](https://yyz2.discourse-cdn.com/free1/user_avatar/fortran-lang.discourse.group/sblionel/32/853_2.png) [@sblionel](https://fortran-lang.discourse.group/u/sblionel)\
**Post date:** [May 4, 2021, 2:16pm UTC](https://fortran-lang.discourse.group/t/learning-coarrays-collective-subroutines-and-other-parallel-features-of-modern-fortran/1146/18 "2021-05-04T14:16:46Z")

</div>

The ifort RANDOM\_NUMBER is known to use an exclusive lock in threaded applications, reducing performance. It might not be the best choice if you’re comparing performance.

---

_[View the full topic](https://fortran-lang.discourse.group/t/learning-coarrays-collective-subroutines-and-other-parallel-features-of-modern-fortran/1146)._