On 02/19/2015 03:53 PM, Nathan Hjelm wrote:
Great! I will add an MCA variable to force CMA and also enable it if 1) no yama and 2) no PR_SET_PTRACER.
cool, thanks again!
You might also look at using xpmem. You can find a version that supports 3.x @ https://github.com/hjelmn/xpmem . It is a kernel module + userspace library that can be used by vader as a single-copy mechanism. In benchmarks it performs better than CMA but it may or may not perform better with a real application. See: http://blogs.cisco.com/performance/the-vader-shared-memory-transport-in-open-mpi-now-featuring-3-flavors-of-zero-copy
ok, I will look (and relay the information to colleagues). Thanks, Eric
