Hello, World with send and receive.

rank=0;

size = 4;

tag=137;

define msg;

send ( msg, 1);

send ( msg, 2);

send ( msg, 3);

printf …;

Processor A

STDOUT

I am processor

0 saying msg.

rank=1;

size = 4;

tag=137;

recv ( msg, 0);

printf …;

Processor B

STDOUT

I am processor

1 saying msg.

rank=2;

size = 4;

tag=137;

recv ( msg, 0);

printf …;

Processor C

STDOUT

I am processor

2 saying msg.

rank=3;

size = 4;

tag=137;

recv ( msg, 0 );

printf …;

Processor D

STDOUT

I am processor

3 saying msg.

Output merged in some order.

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