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require 'rspec'
require 'mpi'
if defined?(NumRu::NArray)
include NumRu
end
describe "MPI" do
before(:all) do
MPI.Init()
end
after(:all) do
MPI.Finalize()
end
before do
@world = MPI::Comm::WORLD
end
it "should give version" do
expect(MPI::VERSION.class).to eq(Integer)
expect(MPI::SUBVERSION.class).to eq(Integer)
end
it "should give rank and size" do
expect(@world.rank.class).to eql(Integer)
expect(@world.size.class).to eql(Integer)
expect(@world.size).to be > 0
end
it "should send and receive String" do
rank = @world.rank
message = "Hello from #{rank}"
tag = 0
@world.Send(message, 0, tag) if rank != 0
if rank == 0
(@world.size-1).times do |i|
str = " "*"Hello from #{i+1}".length
status = @world.Recv(str, i+1, tag)
expect(status.source).to eql(i+1)
expect(status.tag).to eql(tag)
expect(str).to match /\AHello from #{i+1}/
end
end
end
it "should send and receive NArray" do
tag = 10
rank = @world.rank
[NArray[1,2,3], NArray[3.0,2.0,1.0]].each_with_index do |ary0,j|
@world.Send(ary0, 0, tag+j) if rank != 0
if rank == 0
(@world.size-1).times do |i|
ary1 = NArray.new(ary0.typecode, ary0.total)
status = @world.Recv(ary1, i+1, tag+j)
expect(status.source).to eql(i+1)
expect(status.tag).to eql(tag+j)
expect(ary1).to be == ary0
end
end
end
end
it "should send and receive without blocking" do
tag = 20
rank = @world.rank
message = "Hello from #{rank}"
if rank != 0
request = @world.Isend(message, 0, tag)
status = request.Wait
end
if rank == 0
(@world.size-1).times do |i|
str = " "*"Hello from #{i+1}".length
request_recv = @world.Irecv(str, i+1, tag)
status = request_recv.Wait
expect(status.source).to eql(i+1)
expect(status.tag).to eql(tag)
expect(str).to match(/\AHello from #{i+1}/)
end
end
end
it "should gather data" do
rank = @world.rank
size = @world.size
root = 0
bufsize = 2
sendbuf = rank.to_s*bufsize
recvbuf = rank == root ? "?"*bufsize*size : nil
@world.Gather(sendbuf, recvbuf, root)
if rank == root
str = ""
size.times{|i| str << i.to_s*bufsize}
expect(recvbuf).to eql(str)
end
end
it "should gather data to all processes (allgather)" do
rank = @world.rank
size = @world.size
bufsize = 2
sendbuf = rank.to_s*bufsize
recvbuf = "?"*bufsize*size
@world.Allgather(sendbuf, recvbuf)
str = ""
size.times{|i| str << i.to_s*bufsize}
expect(recvbuf).to eql(str)
end
it "should broad cast data (bcast)" do
rank = @world.rank
root = 0
bufsize = 2
if rank == root
buffer = rank.to_s*bufsize
else
buffer = " "*bufsize
end
@world.Bcast(buffer, root)
expect(buffer).to eql(root.to_s*bufsize)
end
it "should scatter data" do
rank = @world.rank
size = @world.size
root = 0
bufsize = 2
if rank == root
sendbuf = ""
size.times{|i| sendbuf << i.to_s*bufsize}
else
sendbuf = nil
end
recvbuf = " "*bufsize
@world.Scatter(sendbuf, recvbuf, root)
expect(recvbuf).to eql(rank.to_s*bufsize)
end
it "should send and recv data (sendrecv)" do
rank = @world.rank
size = @world.size
dest = rank-1
dest = size-1 if dest < 0
#dest = MPI::PROC_NULL if dest < 0
source = rank+1
source = 0 if source > size-1
#source = MPI::PROC_NULL if source > size-1
sendtag = 30 + rank
recvtag = 30 + source
bufsize = 2
sendbuf = rank.to_s*bufsize
recvbuf = " "*bufsize
@world.Sendrecv(sendbuf, dest, sendtag, recvbuf, source, recvtag);
if source != MPI::PROC_NULL
expect(recvbuf).to eql(source.to_s*bufsize)
end
end
it "should change data between each others (alltoall)" do
rank = @world.rank
size = @world.size
bufsize = 2
sendbuf = rank.to_s*bufsize*size
recvbuf = "?"*bufsize*size
@world.Alltoall(sendbuf, recvbuf)
str = ""
size.times{|i| str << i.to_s*bufsize}
expect(recvbuf).to eql(str)
end
it "should reduce data" do
rank = @world.rank
size = @world.size
root = 0
bufsize = 2
sendbuf = NArray.to_na([rank]*bufsize)
recvbuf = rank == root ? NArray.new(sendbuf.typecode,bufsize) : nil
@world.Reduce(sendbuf, recvbuf, MPI::Op::SUM, root)
if rank == root
ary = NArray.new(sendbuf.typecode,bufsize).fill(size*(size-1)/2.0)
expect(recvbuf).to be == ary
end
end
it "should reduce data and send to all processes (allreduce)" do
rank = @world.rank
size = @world.size
bufsize = 2
sendbuf = NArray.to_na([rank]*bufsize)
recvbuf = NArray.new(sendbuf.typecode,bufsize)
@world.Allreduce(sendbuf, recvbuf, MPI::Op::SUM)
ary = NArray.new(sendbuf.typecode,bufsize).fill(size*(size-1)/2.0)
expect(recvbuf).to be == ary
end
it "should not raise exception in calling barrier" do
@world.Barrier
end
it "shoud raise exeption" do
expect { @world.Send("", @world.size+1, 0) }.to raise_error(MPI::ERR::RANK)
expect(@world.Errhandler).to eql(MPI::Errhandler::ERRORS_RETURN)
end
end
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