John R Pierce <pierce at hogranch.com> writes: > On 10/1/2017 9:10 PM, hw wrote: >> I´m trying to download the PDF you pointed me to, but the download is >> stalled. I´m running Centos 7.4, but perhaps there´s an explanation >> in the PDF that might tell me what NUMA split mode is supposed to be. > > > it loaded fine here again tonight. huh. Internet in this country sucks; it´s almost the worst in the world. > the gist of the article is that they got at best 2-4% improvements > with RHEL 6/SLES 6 on dual nehalem/westmere Xeon's when NUMA was > enabled. I see no mention of NUMA Split mode I´ve been able to get the PDF with the tor browser today. I´d say the gist is that using numad can improve performance, depending on the hardware used and on the workload it performs. That, as usual, leaves everyone to do their own testing with their hardware and their workload. In my case --- besides using numad, which won´t hurt anything --- it might be best to use numactl to pin the particular application I want to tune the most to one node and its memory. There is more than enough local memory for it. In theory, that should give best overall performance, and the particular application can nothing but benefit from using local memory. Since it´s also doing disk I/O, I need to find out which of the two nodes might be preferable. Benchmarking would be really difficult. However, that still leaves the mystery what NUMA split mode is supposed to be. -- "Didn't work" is an error.