Ammasso 1100 Uživatelská příručka stáhnout pdf (Strana 32)

Link it by using the following command (note that in this case, it requires the math library):

# mpicc -o cpi cpi.o -lm

NOTE: A Makefile is provided in the examples directory. With this Makefile, one just

needs to run make to compile and link the program. This Makefile can be used as a

starting point for building other MPICH applications.

4.4.1 Creating a MPI Cluster Machines File

Before you can run an MPI program on your cluster, you need to create a machines file to

tell MPI about the cluster configuration. The location of the machines file is:

<install_dir>/mpich-1.2.5/share/machines.LINUX

Or for a 32-bit install on a 64-bit machine

<install_dir>/mpich-1.2.5-32/share/machines.LINUX

Using a text editor, create the appropriate machines file, containing a list of all the host

machines that you will be using, one per line. For example:

# cd <install_dir>/mpich-1.2.5/share

# cat machines.LINUX

hostA # Comments are also allowed

hostB

Each host listed must either be a valid IP address or a host name that returns a valid IP

address from the DNS.

NOTE:

the TCP/IP address used for MPI control should not be confused with the

RDMA IP Address which is used by MPI to move MPI data. The TCP/IP address

traditionally would correspond to the AMSO_IPADDR found in the amso_ccil_0_0

function in the rnic_cfg file or a TCP/IP address associated with another NIC (e.g. eth0).

The Ammasso MPICH implementation does not wrap the machine file hostnames. If you

specify a command line to run with four processes (-np 4), the machines.LINUX file

must have four host processors listed. Also, the Ammasso MPICH implementation does not

start an MPICH process on the local host by default. Each node on which you wish to run

the MPICH job must be specified in the machines.LINUX file.

It is possible to run multiple instances of a program on the same host. Either enter that

hostname into the file multiple times, or add a colon and a number on the corresponding line

in the machines file. For example:

# cd <install_dir>/mpich-1.2.5/share

# cat machines.LINUX

hostA:2 # Two instances on this node

hostB:4 # Four instances on this node

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 65 66

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Ammasso 1100 Uživatelská příručka Strana 32