Monday, April 17, 2017

Generating public keys from a SSH private key

If you just need to generate a Public Key from SSH Private Key, you will need to
# ssh-keygen -y -f ~/.ssh/id_rsa > ~/.ssh/id_rsa.pub
where  -y output the public key

References:
  1. How do I retrieve the public key from a SSH private key?

Wednesday, April 12, 2017

Installing OpenCV on CentOS 6 on yum

Installing OpenCV using CentOS 6 using yum is very straightforward. For CentOS 6,
# yum install python-devel python-nose python-setuptools gcc gcc-gfortran gcc-c++ blas-devel lapack-devel atlas-devel

# yum install opencv

Monday, April 10, 2017

Managing MATLAB Users using MLM options for FlexLM

Step 1: Create a file to mlm.opt

Step 2: Edit your license.dat file
SERVER myMATLABLicense 00000000000000009
DAEMON MLM "/usr/local/MATLAB/R2016b/etc/MLM" port=1708 options="/usr/local/MATLAB/R2016b/etc/mlm.opt"
.....
.....

Step 3: Prepare mlm.opt
# Make user names and host names case insensitive when
# listed in a GROUP or HOST_GROUP.  This is not
# required but it is here to prevent some common errors.
GROUPCASEINSENSITIVE ON


# Define GROUP Users
GROUP MATLAB_BLOCK_USERS user1 user2 user3
GROUP MATLAB_INC_USERS user4 user5 user6


# EXCLUDE Users from MATLAB and selected Toolboxes
EXCLUDE "MATLAB asset_info=111111" GROUP MATLAB_BLOCK_USERS
EXCLUDE "Image_Toolbox asset_info=111111" GROUP MATLAB_BLOCK_USERS
EXCLUDE "Signal_Toolbox asset_info=111111" GROUP MATLAB_BLOCK_USERS


# RESERVE for selected for user1
RESERVE 1 "SIMULINK asset_info=111111" USER user1


# Restrict the number of licenses that can be used on machine "server1"
MAX 4 "MATLAB asset_info=111111" HOST server1


# To exclude ALL features 
EXCLUDEALL GROUP MATLAB_BLOCK_USERS


#Includes a user or pre-defined group of users, etc.
#Anyone not in an INCLUDEALL statement is not allowed to use these features. 
INCLUDEALL GROUP MATLAB_INC_USERS

References:
  1. https://www.mathworks.com/matlabcentral/answers/uploaded_files/2331/sampleMLM.opt
  2. The Options File
  3. Is there a way to administer FLEXnet based licenses? How do I create an Options file?

Thursday, March 2, 2017

Using Intel IMB-MPI1 to check Fabrics and expected performances

In your .bashrc, do source the
source /usr/local/intel_2015/parallel_studio_xe_2015/bin/psxevars.sh intel64
source /usr/local/intel_2015/impi/5.0.3.049/bin64/mpivars.sh intel64
source /usr/local/intel_2015/composerxe/bin/compilervars.sh intel64
source /usr/local/intel_2015/mkl/bin/mklvars.sh intel64
MKLROOT=/usr/local/intel_2015/mkl

To simulate 3 workloads pingpong, sendrecv, and exchange with IMB-MPT1
$ mpirun -r ssh -RDMA -n 512 -env I_MPI_DEBUG 5 IMB-MPT1