Semester of Graduation
Electrical and Computer Engineering
First Major Professor
Dr. Mai Zheng
Master of Science (MS)
Ongoing advancement in non-volatile memory such as NVDIMMs have prompted to huge improvement in the area of persistent memory. It is faster, byte addressable and can persist without power. It allows direct manipulation of data in memory unlike other memory system like hard disk and SSD . It furthers overcomes the limitation of file system overhead that incurs extra burden to application to handle crash during failure. A Persistent program needs to correctly implement certain crash consistency mechanisms such as undo and redo logging. The program should be able to recover to consistent state after failure. Due to volatile caching and reordering of writes within memory hierarchy, programs need to carefully manage the order in which writes become persistent when implementing crash consistent software.
Persistent-memory applications ensure the consistency of persistent data by inserting ordering points between writes to PM allowing the construction of higher-level transaction mechanisms.PM System have introduced new instructions such as CLWB and SFENCE from x86 and DC CVAP from ARM to ensure ordering and further introduced high level transactional libraries to ensure persistence.
Required by the crash consistency guarantee, that is a program returns to a consistent state and resumes the execution after a failure, a testing tool is expected to detect inconsistencies during the entire procedure of execution, recovery, and resumption. Therefore, we proposed new method that will the log all the I/Os using intel pin tool and replay the all the I/Os and check the consistency of program by comparing the initial image and a final image.We are checking the consistency of program post failure by emulating the failure by removing some of I/O’s writes while replaying to check if program can recover itself after crash
Embargo Period (admin only)
Prakash, Satya, "Evaluating Crash Consistency for PM Software using Intel Pin" (2020). Creative Components. 608.