Hp XC System 2.x Software Instrukcja Użytkownika Pobierz pdf (Strona 58)

4.2.1 Debugging with TotalView

You can purchase the TotalView debugger, from Etnus, Inc., for use on the HP XC cluster.

TotalView is a full-featured, GU I-based debugger specifically designed to m eet the requirements

of parallel applications running on many processors.

TotalView has b een tested for use in the HP XC environment. However, it is not included with

the HP XC software and technical support is not provided by HP XC. If you install and use

TotalView, and have problems with it, contact Etnus, Inc.

This section describes how to use TotalView in the HP XC environment. It provides set up and

configuration information, and an example of debuggin g applications. Instructions for installing

TotalView are in cluded in t he HP XC System Software Installation Guide.

This section provides only minimum instructions to get you started using TotalView. It is

recommended that you obtain TotalView documentation for full i nformation about u sing

TotalView. The TotalView documentation set is available directly from Etnus, Inc. at the

following URL:

http://www.etnus.com.

4.2.1.1 SSH and TotalView

As discussed in Section 2.1 and Section 10.1, XC systems use the OpenSSH package in place

of traditional co mmands like rsh to provide more secure communication between nodes in

the cluster. When run in a parallel environment, TotalView expects to be able to use the

rsh command to communicate with other nodes, but the default XC configuration disallo ws

this. Users should set the TVDSVRLAUNCHCMD environment variable to specify an alternate

command for TotalView to use in place of rsh. When using the TotalView Modulefile,

asdescribedinSection4.2.1.2,this variable is automatically set to /usr/bin/ssh -o

BatchMode=yes. Users who manage t heir environments independently of the provided

modulefiles will need t o set this variable man uall y.

4.2.1.2 Setting Up TotalView

Before you can use TotalView, your admin istrator must install it on the HP XC system, and your

operating environment must be properly set up for TotalView.

Your administrator may have already installed TotalView and set up the environment for you. In

this case, you can skip the steps in this section and proceed to Section 4.2.1.5, which describes

using TotalView for the first time.

The set up of your environment to run TotalView consists of configuring the PATH and

MANPATH variables so that they can locate the TotalView executable and m a npag es when

TotalView is invoked. This configuration step is recommended, but not absolutely necessary,

because. you can optionally start TotalVi ew by entering its full pathname. The HP XC system

provides the TotalView modulefile to configure your enviro nm ent for you, as described in

the following steps.

To prepare your environment to use TotalView, proceed as follows:

1. Determine if TotalView has been installed, and whether environment variables have been

defined for TotalView. You can use standard Linux comm ands to check these things.

2. Depending upon the status of TotalView, do one of the following things:

• If TotalView is installed and your environment is set up, proceed to Section 4.2.1.5,

for information about running TotalView for the first tim e.

• If TotalView is installed, but y our environment is not yet set up, either you or your

system administrator sho uld set it up, as described in the next step.

4-2 D ebugging Applications

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