Hi yanfei 

Thanks for creating the ticket. 

Do you have any idea on how long this ticket will be handled and closed? 

I think for this ticket the code change should not be big. This feature is pretty urgent for my team. 

Thanks

On Wed, 6 Dec 2017 at 12:07 Guo, Yanfei <yguo@anl.gov> wrote:

I have created an ticket to track it. https://github.com/pmodels/mpich/issues/2889

Yanfei Guo
Assistant Computer Scientist
MCS Division, ANL



On 12/6/17, 11:52 AM, "Shuwei Zhao" <shuweizhao1991@gmail.com> wrote:

Are you going to use getaddrinfo instead to deprecate gethostbyname?


Thanks

On Wed, 6 Dec 2017 at 11:50 Guo, Yanfei <yguo@anl.gov> wrote:


Hi Shuwei,

The communication over IPv6 network is supported as long as the lower-level network library supports it. However, MPICH uses gethostbyname to translate hostnames to addresses in order to initialize the link which is not working on pure IPv6.

Yanfei Guo
Assistant Computer Scientist
MCS Division, ANL



On 12/6/17, 11:46 AM, "Shuwei Zhao" <shuweizhao1991@gmail.com> wrote:

Hi Yanfei，


I ask this question months ago，but I was told IPv6 is supported in mpich 3.*. So it's not supported?


Thanks
Shuwei

On Wed, 6 Dec 2017 at 11:24 Guo, Yanfei <yguo@anl.gov> wrote:


Hi Carlos,

MPICH currently uses gethostbyname which does not support IPv6, therefore it won’t work on a pure IPv6 network.

Best,

Yanfei Guo
Assistant Computer Scientist
MCS Division, ANL



On 11/22/17, 2:23 PM, "Carlos" <carlos@inf.ufpr.br> wrote:

Is it possible to use mpich (3.3) with IPv6-only? We tried it here and got

Fatal error in MPI_Init: Other MPI error, error stack:
MPIR_Init_thread(506)..............:
MPID_Init(211).....................: channel initialization failed
MPIDI_CH3_Init(89).................:
MPID_nem_init(324).................:
MPID_nem_tcp_init(178).............:
MPID_nem_tcp_get_business_card(425):
ckpt_restart(384)..................: gethostbyname failed, zuratkul (errno 4)
                                     *************

This shows that mpich doesn't run without IPv4, which is our case... Is there a
way to make it work in this situation?
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