[illumos-Developer] dtrace signed sum

[Adam Leventhal]

Hey Richard,

I'm not sure I understand what you mean. The sum() aggregating action is signed:

# dtrace -n BEGIN'{ @ = sum(-45); @ = sum(5); exit(0); }'
dtrace: description 'BEGIN' matched 1 probe
CPU     ID                    FUNCTION:NAME
  2      1                           :BEGIN

              -40

Adam

On Tue, Jun 21, 2011 at 4:07 PM, Richard Elling
<richard.elling at gmail.com> wrote:
> I have  a desire for a the sum() aggregation to be signed. The reason is to count up and down.
> Perhaps a signed count() would also be better? Increment/decrement?
> Thoughts?
>  -- richard
>
>
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-- 
Adam Leventhal, Delphix
http://dtrace.org/blogs/ahl

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