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Computer Science > Distributed, Parallel, and Cluster Computing

arXiv:2102.13140 (cs)
[Submitted on 25 Feb 2021]

Title:Checkpointing with cp: the POSIX Shared Memory System

Authors:Lehman H. Garrison, Daniel J. Eisenstein, Nina A. Maksimova
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Abstract:We present the checkpointing scheme of Abacus, an $N$-body simulation code that allocates all persistent state in POSIX shared memory, or ramdisk. Checkpointing becomes as simple as copying files from ramdisk to external storage. The main simulation executable is invoked once per time step, memory mapping the input state, computing the output state directly into ramdisk, and unmapping the input state. The main executable remains unaware of the concept of checkpointing, with the top-level driver code launching a file-system copy between executable invocations when a checkpoint is needed. Since the only information flow is through files on ramdisk, the checkpoint must be correct so long as the simulation is correct. However, we find that with multi-GB of state, there is a significant overhead to unmapping the shared memory. This can be partially mitigated with multithreading, but ultimately, we do not recommend shared memory for use with a large state.
Comments: 3 pages, 1 figure. Extended abstract accepted by SuperCheck21. Symposium presentation at this https URL
Subjects: Distributed, Parallel, and Cluster Computing (cs.DC)
Cite as: arXiv:2102.13140 [cs.DC]
  (or arXiv:2102.13140v1 [cs.DC] for this version)
  https://doi.org/10.48550/arXiv.2102.13140

Submission history

From: Lehman Garrison [view email]
[v1] Thu, 25 Feb 2021 19:38:02 UTC (373 KB)
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