> -----Original Message----- > From: Kudryavtsev, Andrey O [mailto:andrey.o.kudryavtsev@xxxxxxxxx] > Sent: Monday, 12 January, 2015 3:06 PM > To: Andrey Kuzmin > Cc: Elliott, Robert (Server Storage); fio@xxxxxxxxxxxxxxx > Subject: Re: REPORT: FIO random read performance degradation without > "norandommap" option > > Hi Andrey, > Thank you, it explains the purpose of this feature. Unfortunately it was > not clear to me from the manual, I faulty supposed it increases the > randomness of the random generator distribution. Thanks again! > > I’d propose to have it auto set to "norandommap" if “randread” workload is > specified. Does it make sense? > I don't think I'd change it. For randread, randommap ensures that each LBA has been accessed once before it repeats reading any of the LBAs. That could be useful in some cases, like scanning the media (ensuring you've read each LBA). --- Rob Elliott HP Server Storage ��.n��������+%������w��{.n�������^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�
