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2009 Aug 14
4
Assigning values based on a separate reference (lookup) table
..., I have a data frame of 360 rows by 720 columns (259200 values). For each value in this grid I am hoping to apply an equation to, to generate a new grid. One of the parts of the equation (called 'p') relies on reading from a separate reference table. This is Table 4 at: http://www.fao.org/docrep/s2022e/s2022e07.htm#3.1.3%20blaney%20criddle%20method (scroll down a little). Therefore, 'p' relies on the latitude of the values in the initial 360 x 720 data frame. The row names of the data frame contain the latitude values and these range from between 89.75 to -89.75 (the latter being...
2014 Feb 20
1
disk io in guests causes soft lockups in guests and host processes
Hi, I have a strange phenomenon that I cannot readily explain so I wonder if anyone here can shed a light on this. The host system is a Dell r815 with 64 cores and 256G ram and has centos 6 installed. The five guests are also running centos 6 and are running as a hadoop cluster. The problem is that I see disk-io spikes in the vm's which then cause soft lockups in the guest but I also see