The program ./allgather_test runs the intergroup all-to-all broadcast in
a loop. The number of iterations can be set
by the command-line option -n
. The default is 10.
-
Compile command:
- Edit file (Makefile to customize the C compiler and compile options.
- Run command
make
to compile and generate the executable program namedallgather_test
.
-
Run command:
- Command-line options:
% ./allgather_test -h Usage: ./allgather_test [OPTION]... [FILE]... [-h] Print help [-s] number of MPI processes in group A [-r] number of MPI processes in group B [-a] message count per process in group A [-b] message count per process in group B [-d] message block unit size [-n] number of trials for the experiments [-p] only significant for Allgatherv (when t = 3, 4) 0: regular message distribution 1: irregular message distribution [-t] which evaluation 0: Intergroup Allgather with native MPI library 1: Intergroup Allgather with algorithm 2 of EuroMPI paper 2: Intergroup Allgather with algorithm 1 of PARCO paper 3: Intergroup Allgatherv with native MPI library 4: Intergroup Allgather with algorithm 2 of PARCO paper
- Command-line options:
-
Example outputs on screen
- Suppose we have 10 processes in group A and 22 processes in group B. Every process in group A sends 15 data blocks to group B and every process in group B sends 20 data blocks to group A. Every data block has 11 integers. We want to evaluate Algorithm 2 proposed in PARCO paper with 5 iterations.
% mpiexec -n 32 ./allgather_test -a 15 -b 20 -s 10 -r 22 -d 11 -p 0 -t 4 -n 5 n_senders=10,n_receivers=22,dim_x=11,size1=10,size2=20,method=4,pattern=0 Universal full duplex allgatherv time=0.059017(message size time)+0.037100(intergroup message transfer)+0.066018(intragroup allgather)=0.162135 Universal full duplex allgatherv time=0.036167(message size time)+0.020993(intergroup message transfer)+0.039993(intragroup allgather)=0.097153 Universal full duplex allgatherv time=0.041959(message size time)+0.021000(intergroup message transfer)+0.039992(intragroup allgather)=0.102951 Universal full duplex allgatherv time=0.042807(message size time)+0.021071(intergroup message transfer)+0.054091(intragroup allgather)=0.117969 Universal full duplex allgatherv time=0.050991(message size time)+0.035053(intergroup message transfer)+0.054941(intragroup allgather)=0.140985 Time used for universal full duplex allgatherv=0.621193, removing extreme=0.361905
email: qiao.kang@eecs.northwestern.edu
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See COPYRIGHT notice in top-level directory.