[mpich-discuss] how to run jobs using IPv6?

[Guo, Yanfei]

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 at 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 at 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 at 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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