On Mon, Aug 06, 2018 at 06:00:54PM +0900, Yoshimi Ichiyanagi wrote: > The libpmem's pmem_map_file() supported 2M/1G(the size of huge page) > alignment, since it could reduce the number of page faults. > In addition, libpmem's pmem_memcpy_nodrain() is the function > to copy data using single instruction, multiple data(SIMD) instructions > and NT store instructions(MOVNT). > As a result, using these APIs is faster than using old mmap()/memcpy(). > > Please see the PGCon2018 presentation[1] for the details. > > [1] > https://www.pgcon.org/2018/schedule/attachments/507_PGCon2018_Introducing_PMDK_into_PostgreSQL.pdf
So you say that this represents a 3% gain based on the presentation? That may be interesting to dig into it. Could you provide fresher performance numbers? I am moving this patch to the next CF 2018-10 for now, waiting for input from the author. -- Michael
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