On 27/12/2018 00:53, Thomas Munro wrote: > mmap and sysv were the same, but there > did seem to be a measurable speed-up available at high client counts > with kern.ipc.shm_use_phys=1 and thus for sysv only, for people > prepared to set 3 sysctls and this proposed new GUC. Maybe the effect > would be greater with bigger shared_buffers or smaller pages (this > test ran on super pages)? More work required to figure that out.
Could you get a similar effect for mmap by using mlock() to prevent the pages from being swapped? -- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
