Toward Message Passing Failure Management

As machine sizes have increased and application runtimes have lengthened, research into fault tolerance has evolved alongside. Moving from result checking, to rollback recovery, and to algorithm based fault tolerance, the type of recovery being performed has changed, but the programming model in which it executes has remained virtually static since the publication of the original Message Passing Interface (MPI) Standard in 1992. Since that time, applications have used a message passing paradigm to communicate between processes, but they could not perform process recovery within an MPI implementation due to limitations of the MPI Standard. This dissertation describes a new protocol using the exiting MPI Standard called Checkpoint-on-Failure to perform limited fault tolerance within the current framework of MPI, and proposes a new platform titled User Level Failure Mitigation (ULFM) to build more complete and complex fault tolerance solutions with a true fault tolerant MPI implementation. We will demonstrate the overhead involved in using these fault tolerant solutions and give examples of applications and libraries which construct other fault tolerance mechanisms based on the constructs provided in ULFM

Community and mental health

Contemporary mental health policy and practice has been based on two basic principles – the need for an evidence-based approach to practice and a recognition of the importance of understanding the lived experience of mental illness. Beyond the symptoms of the various disorders is the range of personal and social consequences of illness. These include disruptions to a sense of self, relationships, economic security, work, and housing. The social context and social consequences of mental disorder are central to social work practice in the mental health area. This chapter has explored a number of theoretical perspectives including the concept of lived experience, recovery theory, stigma, shame, and empowerment. A practice focusing on these social dimensions of mental illness demands an engagement both with the broader evidence base shared by all disciplines, and a specific concern for individuals and their families, and the experience of mental illness and its consequences in their lives