# Coarray version of MPI\_AlltoAll

**URL:** <https://fortran-lang.discourse.group/t/coarray-version-of-mpi-alltoall/4027>\
**Category:** Help\
**Created:** [July 20, 2022, 12:00am UTC](https://fortran-lang.discourse.group/t/coarray-version-of-mpi-alltoall/4027 "2022-07-20T00:00:07Z")\
**Posts on this page:** 1\
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**Author:** ![han190](https://yyz2.discourse-cdn.com/free1/user_avatar/fortran-lang.discourse.group/han190/32/7158_2.png) [@han190](https://fortran-lang.discourse.group/u/han190)\
**Post date:** [July 20, 2022, 7:04am UTC](https://fortran-lang.discourse.group/t/coarray-version-of-mpi-alltoall/4027/5 "2022-07-20T07:04:06Z")

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@milancurcic Thanks again for directing me to the book! I will have to read chapter 9 and 10 thoroughly before I am able to make any serious conclusion. BTW, is that possible for me to accept more than one replies as solutions? Currently I am only allowed to select one.

@nncarlson Yes, I read your [post](https://fortran-lang.discourse.group/t/coarrays-not-ready-for-prime-time/2715) about coarray and definitely understand your concern, but coarray is a very attractive feature for me (and probably many other domain scientists) because it is standard conforming, and the syntax of it is just elegant. Personally, I am inclined to use it if the performance penalty isn’t unacceptable. I will come back for the testing part once I have my `co_alltoall` implemented. Thank you for your suggestions!

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