> From: fio-owner@xxxxxxxxxxxxxxx [mailto:fio-owner@xxxxxxxxxxxxxxx] On > Behalf Of Prabhakaran > Sent: Thursday, February 22, 2018 6:33 PM > Subject: Does memory speed matters? > > I would like to know if memory(RAM) speed matters in running fio at > full speed? I didn't find any difference between 2400MHz and 3600MHz, > even in latency. It does if you're testing persistent memory devices. For SSDs or HDDs, memory is much faster than the storage subsystem, and fio's buffers are probably in CPU caches, so it's less likely to be the bottleneck. A large number of jobs with large buffers can overflow the caches and trigger memory traffic. On an Intel-based system, pcm-memory from https://github.com/opcm/pcm shows the amount of memory traffic that is occurring. --- Robert Elliott, HPE Persistent Memory ��.n��������+%������w��{.n�������^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�
