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<h1><span class="section-number">11.6. </span>Fault tolerance<a class="headerlink" href="#fault-tolerance" title="Permalink to this heading"></a></h1>
<p>The phrase “fault tolerance” means many things to many
people. Typical definitions include user processes dumping vital
state to disk periodically, checkpoint/restart of running processes,
elaborate recreate-process-state-from-incremental-pieces schemes,
and many others.</p>
<p>In the scope of Open MPI, we typically define “fault tolerance” to
mean the ability to recover from one or more component failures in a
well defined manner with either a transparent or application-directed
mechanism. Component failures may exhibit themselves as a corrupted
transmission over a faulty network interface or the failure of one or
more serial or parallel processes due to a processor or node failure.
Open MPI strives to provide the application with a consistent system
view while still providing a production quality, high performance
implementation.</p>
<p>Yes, that’s pretty much as all-inclusive as possible — intentionally
so! Remember that in addition to being a production-quality MPI
implementation, Open MPI is also a vehicle for research. So while
some forms of “fault tolerance” are more widely accepted and used,
others are certainly of valid academic interest.</p>
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