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Checkpoint-Restart: Proprietary Hardware and the "Spiderweb API"


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Title Checkpoint-Restart: Proprietary Hardware and the "Spiderweb API"
Title of Series REcon 2011
Author Kerr, Gregory
Contributors Brick, Alex
Cooperman, Gene
Bratus, Sergey
License CC Attribution - NonCommercial - NoDerivatives 3.0 Unported:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
DOI 10.5446/32917
Publisher REcon
Release Date 2011
Language English

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Subject Area Information technology
Abstract This summary describes a package to transparently checkpoint and restart applications which run over Infiniband. Infiniband is rapidly growing as a high-speed interconnect, even appearing on departmental clusters. The current work grew out of the needs of high performance computing. As of November, 2010, 43% of the TOP500 supercomputers run Infiniband. However, the ability to checkpoint immediately provides access to a poor man's reversible debugger. Using our DMTCP (Distributed MultiThreaded CheckPointing), we can already checkpoint a GDB session today: if we have executed 100 commands since the last checkpoint, we can undo the last instruction by restarting the checkpoint and going forward 99 commands. Since many apps access Infiniband through MPI (Message Passing Interface) instead of direct communication with Infiniband, we also integrated DMTCP into the OpenMPI dialect so as to transparently debug an MPI-based application. Infiniband's primary mechanism to provide fast latency is Remote Direct Memory Access (RDMA). One host can directly read or write the RAM of another host, without intervention by the CPU or software. The previously mentioned debugger logs commands and allows you to go back in history, through restarting and re-executing. It means that we can now conceive of time as a spatial dimension instead of a temporal dimension. So we can write a binary search program acting over the process's lifetime. This is illustrated in a later section. In a complex Infiniband computation, memory is written to and read from with latencies of less than 1 microsecond. Assert statements or breakpoints would change the course of execution because the program no longer runs at native speed.


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