I am running some tests using memached 1.4.22 over an Intel Xeon E5 (4 sockets with 8 core each, 2 Hyper threads per core, and 4 NUMA nodes) and running Ubuntu trusty. I compiled memcached with gcc-4.8.2 with default CFLAGS and configuration options.
The problem is whenever I start memcached with odd number of server threads (3,5,7,9,11,..) everything is ok, and all threads are engaging in processing requests, the status of all threads are "Running". However, if I start the server with even number of threads (2,4,6,8,..), half of the threads are always in sleep mode and do not engage in servicing clients. This is related to memached, as memaslap, for example, is running with no such pattern. I ran the exact test on an AMD Opteron and things are ok with memached. So my question is: is there any specific tuning required for Intel machines? Is there any specific flag or some part of the code that might cause worker threads to not engage? Thanks, Saman -- --- You received this message because you are subscribed to the Google Groups "memcached" group. To unsubscribe from this group and stop receiving emails from it, send an email to memcached+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
