Incorrect column headings in CSV file if showing memory

[andriokha]

Hi,

Many thanks for dstat, I've found it very useful for ad-hoc monitoring. I've been struggling with what seemed like weird results, and I think I've found the problem.

$ dstat -ms --output out.csv 1 5

stdout:

------memory-usage----- ----swap---
 used  free  buff  cach| used  free
3955M  891M 2777M 48.6M|   0  4094M
3955M  891M 2777M 48.6M|   0  4094M
3955M  891M 2777M 48.6M|   0  4094M
3955M  891M 2777M 48.6M|   0  4094M
3955M  891M 2777M 48.6M|   0  4094M

out.csv

"Cmdline:","dstat -ms --output temp.csv 1 5",,,,"Date:","26 Apr 2014 14:28:19 BST"
"memory usage",,,,"swap",
"used","free","buff","cach","used","free"
4146851840,934621184,2911694848,50966528,306008064,77385728,20946944,0,4292866048
4146851840,934621184,2911694848,50966528,306008064,77385728,20946944,0,4292866048
4146851840,934629376,2911686656,50974720,305999872,77385728,20946944,0,4292866048
4146851840,934629376,2911686656,50974720,305999872,77385728,20946944,0,4292866048
4146851840,934617088,2911686656,50974720,306008064,77385728,20951040,0,4292866048

Note that although there are only 6 header fields, there are 9 fields of raw data. Taking a quick look at dstat_mem

self.nick = ('used', 'free', 'buff', 'cach')
self.vars = ('MemTotal', 'MemUsed', 'MemFree', 'Buffers', 'Cached', 'Shmem', 'SReclaimable')

it seems that the CSV gets every variable defined (7 of them) but the headers are based on the number of nicks. This means the labels are out of sync for every field coming after memory.

Thanks!