Ubunt 14.04 (LTS) build error: error: ‘MPI_Iallreduce’ was not declared in this scope about cntk HOT 12 CLOSED

Hi Ken,

Which version of openmpi are you using?

You can try the following steps:

cd ~
wget http://www.open-mpi.org/software/ompi/v1.10/downloads/openmpi-1.10.1.tar.gz
gunzip -c openmpi-1.10.1.tar.gz | tar xf -
cd openmpi-1.10.1
./configure --prefix=$HOME/mpi
make -j all install
export PATH=$HOME/mpi/bin:$PATH

[Change directory to CNTK repository root, e.g. $HOME/src/CNTK/]
mkdir -p build/release && cd build/release && ../../configure --with-buildtype=release && make -j all
cd .. && mkdir debug && cd debug && ../../configure --with-buildtype=debug && make -j all
export PATH=$PATH:$HOME/src/CNTK/build/debug/bin/

Let us know.
Thanks,
Gaizka

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Also I spotted you use Cuda 7.5, while the code expects 7.0, so there might be extra errors, after this one is resolved with such config

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Hi Gaizka,
I did use the openmpi version 1.10.1 and installed it into my home folder as you suggested.
I also tried building as debug as you recommended, and got the same error message.
BR
Ken

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Hi @alexeyo26
I am a little uncomfortable installing CUDA kit v7.0 since ver7.5 is working fine with other tools. Do you know if it is safe to install two different versions of the CUDA tool kits?
BTW, when will Microsoft release a binary pkg with CUDA 7.5 for Linux?
Thanks
Ken

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Type 'which mpic++' and ensure it's pointing to the bin folder of your newly built OpenMPI. Make sure your path is set properly with the path to the bin folder of the newer OpenMPI ahead of the path to any other instance on your system so that the correct mpic++ wrapper is called in the build process.

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Hi Ross,
Thank you for the tip! Yeah, it was my mistake. I had my $HOME/mpi/bin
appended to $PATH, instead of prefixing it.
It works now.
BR
Ken

On 01/28/2016 07:34 PM, Ross Wightman wrote:

Type 'which mpic++' and ensure it's pointing to the bin folder of your
newly built OpenMPI. Make sure your path is set properly with the path
to the bin folder of the newer OpenMPI ahead of the path to any other
instance on your system so that the correct mpic++ wrapper is called
in the build process.

—
Reply to this email directly or view it on GitHub
#48 (comment).

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@ktang2k Hi,Ken, I also met the same problem ,which was the 'Source/SGDLib/SimpleDistGradAggregator.h:282:186: error: ‘MPI_Iallreduce’ was not declared in this scope'. I have carefullly checked the path of mpic++, I am sorry ,but I don't understand what did you do. Could you give me more suggestions? Thank you. by the way, System :ubuntu15.04 ,cuda Toolkit v7.5

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Hi,
In my case, I had to make sure the correct version of MPI is called by the
builder, by prefixing its lib and bin folders to PATH and LD_LIBRARY_PATH
Ken
On Mar 4, 2016 5:21 AM, "linquanxu" [email protected] wrote:

@ktang2k https://github.com/ktang2k Hi,Ken, I also met the same problem
,which was the 'Source/SGDLib/SimpleDistGradAggregator.h:282:186: error:
‘MPI_Iallreduce’ was not declared in this scope'. I have carefullly checked
the path of mpic++, I am sorry ,but I don't understand what did you do.
Could you give me more suggestions? Thank you.

—
Reply to this email directly or view it on GitHub
#48 (comment).

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@ktang2k Hi Ken,Thank you for your reply,My config file (/etc/bash.bashrc) as follows:export PATH=/usr/local/mpi/bin:/usr/local/MATLAB/R2013a/bin:/usr/local/cuda-7.0/bin:$PATH,
export LD_LIBRARY_PATH=/usr/local/mpi/lib:/opt/acml5.3.1/ifort64/lib:/opt/acml5.3.1/ifort64_mp/lib:/usr/local/cudnn-4.0/cuda/lib64:/usr/local/cuda-7.0/lib64:$LD_LIBRARY_PATH. but I got the same error message.How can I solve the problem?

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Hi linquanxu, I could not see why your build would fail.
The only diff I spot is that you are a using system installed mpi. I am
using locally installed (to my home folder) as suggested by the setup
instruction. But I seriously doubt that could be the issue :)
Sorry, I am out of ideas now.
Ken

On Sun, Mar 6, 2016 at 9:05 AM, linquanxu [email protected] wrote:

@ktang2k https://github.com/ktang2k Hi Ken,Thank you for your reply,My
config file (/etc/bash.bashrc) as follows:export
PATH=/usr/local/mpi/bin:/usr/local/MATLAB/R2013a/bin:/usr/local/cuda-7.0/bin:$PATH
,

export
LD_LIBRARY_PATH=/usr/local/mpi/lib:/opt/acml5.3.1/ifort64/lib:/opt/acml5.3.1/ifort64_mp/lib:/usr/local/cudnn-4.0/cuda/lib64:/usr/local/cuda-7.0/lib64:$LD_LIBRARY_PATH.
but I got the same error message.How can I solve the problem?

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#48 (comment).

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@ktang2k Hi,Key,Thanks again,But issue still exists.I should have check this more clearly.

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Do you solve this issue @linquanxu ? I use
OS: ubuntu14.04.4
cude: cuda 7.5.18
openmpi: openmpi-1.10.2
and I also got the same error message.

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