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IST-033576 D2.1.4

The above examples set the PATH, MANPATH and LD_LIBRARY_PATH

variables in your current shell only. It is strongly recommended that you make

these settings permanent, to make these settings affect future sessions or windows.

To do this, you must add the example commands to your shell’s start up ﬁles. For a

single user of BLCR, you should add the appropriate set of commands to the shell

startup ﬁles in your home directory (.bashrc for bash, .proﬁle for other bourne-

type shells, or .cshrc for csh-type shells). For a system-wide installation, add the

bourne shell commands to /etc/bashrc and /etc/proﬁle and the csh commands to

/etc/cshrc.

B.4 Checkpointing/restarting applications on a single machine

B.4.1 Types of applications supported

BLCR currently supports:

• Single threaded applications

• Multithreaded applications using either LinuxThreads or NPTL (the old and

new Linux pthreads implementations, respectively)

• Process trees, meaning a process and all its "reachable" descendants (ex-

cluding those who’s parent has exited)

• Process groups (as deﬁned by POSIX), which typically means a command

pipeline launched by a shell (e.g. cat foo bar | sort)

• POSIX sessions, which typically means a login shell and all its descendants

or a batch job

However, certain applications are not supported because they use resources

not restored by BLCR:

• Applications which use sockets (regardless of address family). If a check-

point is taken of a process with open sockets, they will not be restored when

the process is restarted. Applications or libraries may register a checkpoint

callback to manage socket connections to re-open them at restart time (this

is how MPI libraries typically work with BLCR), but the core BLCR check-

pointer does not directly support restoring sockets. NEW: This behavior is

a change from releases prior to 0.5.0 which would fail at checkpoint time if

sockets were open.

• Applications which use SystemV IPC mechanisms including shared mem-

ory, semaphores and message queues. As with sockets, code that is BLCR-

aware may choose to take its own measures to deal with these resources.

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CDA SC510 Guida Utente Pagina 44