[Bug 1072] New: pmlogger output semantic or physical compression

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Bug ID	1072
Summary	pmlogger output semantic or physical compression
Product	pcp
Version	unspecified
Hardware	All
OS	Linux
Status	NEW
Severity	major
Priority	P5
Component	pcp
Assignee	pcp@kenj.com.au
Reporter	fche@redhat.com
CC	pcp@oss.sgi.com
Classification	Unclassified

buffalo todo list item #3:

- pcp todo item 3: pmlogger logging proc.* - data quantity
  - it is desirable to log some textual proc.* bits for analysis, like
    a hypothetical (?) proc.psinfo.environ metric, but this is very large
[...]
  - repeated data values bloat the log file
  - (a sign of this is how gzip-compressible archives are: >>90% common)
  - pmlogger should get a mode to skip same-as-last-value entries
    - (though this would not reduce query load on target pmcd)
  - semantics may permit this sort of change without archive file format
revision
  - or use libz to compress on the fly & decompress on the fly too
    - ideally retaining compatible .index file-offset format

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