Several user-level checkpointing libraries that checkpoint Unix processes have been developed. However they do not support multithreaded programs. This paper describes a user-level checkpointing library to checkpoint multithreaded programs that use the POSIX threads library provided by Solaris 2. Experiments with programs from the SPLASH-2 benchmark suite showed a 3% to 10% increase in execution time with checkpointing enabled, plus an additional overhead for saving the program's state. The checkpointing library described here is available at http://www.dcs.uky.edu//sup /spl sim//chkpt/.
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