MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE Manuale Utente Scaricare il pdf (Pagina 18)

2 Network Administration

Locating Checkp

oint Directories

Checkpoint dire

ctories contain information related to persistence data, which

the server servi

ces use to create continuity from one instance of a session to

another. For exa

mple, if you stop and restart a job manager, the new session

continues the o

ld session, using all the same data.

A primary featu

re offered by the checkpoint directories is in crash recovery.

This allows ser

ver services to automatically resume their sessions after a

system goes dow

n and comes back up, minimizing the loss of data. However,

if a MATLAB wor

ker goes down during the evaluation of a task, that task

is neither ree

valuated nor reassigned to another worker. In this case, a

Þnished job m

ay not have a complete set of output data, because data from

any unÞnishe

d tasks might be missing.

Note If a job m

anager crashes and restarts, its workers can take up to 2

minutes to re

Platform File Location

Windows

The default location of the checkpoint

directories is <TEMP>\MDCE\Checkpoint,

where <TEMP> is the value of the system

TEMP variable. For example, if TEMP is set to

C:\TEMP, the checkpoint directories are placed

in C:\TEMP\MDCE\Checkpoint.

You can set alternative locations for the

checkpoint directories by modifying the

CHECKPOINTBASE setting in the mdce_def.bat

Þle before starting the mdce service.

UNIX and Macintosh

The checkpoint directories are placed by default

in /var/lib/mdce/.

You can set alternative locations for the

checkpoint directories by modifying the

CHECKPOINTBASE setting in the mdce_def.sh

Þle before starting the mdce service.

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MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE Manuale Utente Pagina 18

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