On Tue, 24 May 2011, Dave Love wrote:
..._RESERVED_USAGE are at least badly documented. When I came across
them I interpreted `reserved' to mean resource reservation, i.e. the
overhead from doing that. I'll fix the doc; does anyone have a good
suggestion for a better description? I'm inclined to say `available
resources' and explain further. I haven't got round to checking, but I
assume what's used for cpu is running time multiplied by slot count;
anyone know what's used for io, which is specifically mentioned?
I took a look at this when I was fiddling around with usage_weight_list
setting. With ..._RESERVED_USAGE=true, the values are equal to:
cpu = slots * seconds
mem = slots * seconds * gigabytes-per-slot
io = (don't know - haven't looked yet)
I've not looked at the code yet, but I did test GE 6.2u5 to check that
these are indeed the values that find their way into the sharetree (if
using SHARETREE_RESERVED_USAGE) or the accounting file (if using
ACCT_RESERVED_USAGE).
It was an interesting doing this - it also made me appreciate that the PE
configuration can cause 1 to be added to the slots count in the above
calculations (I think it was some combination of control_slaves and
job_is_first_task).
Also, I wonder why SHARETREE_RESERVED_USAGE is deprecated, as it seems
more useful default.
...
I couldn't agree more.
Personally, the only reason I'd use ACCT_RESERVED_USAGE would be to verify
the numbers being fed into the sharetree.
e.g. after fiddling around with usage_weight_list and I wanted to check
the result on particular types of job (it's easier than subtracting the
history from the "usage" values stored in the sharetree)
Mark
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Mark Dixon Email : [email protected]
HPC/Grid Systems Support Tel (int): 35429
Information Systems Services Tel (ext): +44(0)113 343 5429
University of Leeds, LS2 9JT, UK
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