I’ve actually posted metrics on this
before – and you’re pretty much right. The performance penalties of
using evaluate are trivial at best, and often times non-existent. The metrics
below demonstrate that, given server conditions, the evaluate code can even
perform faster than inline code Anyway, it’s *very* clear from the results that the overhead of evaluate is
largely over-hyped. Also, attached are the two test files I used to generate
the metrics.
|
Simple _expression_ - 10,000 Iterations
|
|
|
Inline
|
Evaluate
|
|
Run 1
|
32
|
62
|
|
Run 2
|
31
|
78
|
|
Run 3
|
16
|
62
|
|
Run 4
|
31
|
79
|
|
Run 5
|
31
|
63
|
|
Average
|
28.2
|
68.8
|
|
|
|
|
|
Simple _expression_ - 100,000 Iterations
|
|
|
Inline
|
Evaluate
|
|
Run 1
|
328
|
437
|
|
Run 2
|
312
|
828
|
|
Run 3
|
297
|
485
|
|
Run 4
|
313
|
828
|
|
Run 5
|
312
|
578
|
|
Average
|
312.4
|
631.2
|
|
|
|
|
|
Object Invocation - 1000 Iterations
|
|
|
Inline
|
Evaluate
|
|
Run 1
|
1830
|
2190
|
|
Run 2
|
1328
|
1391
|
|
Run 3
|
1437
|
1078
|
|
Run 4
|
1313
|
1843
|
|
Run 5
|
1843
|
1688
|
|
Average
|
1550.2
|
1638
|
|
|
|
|
|
Object Invocation - 10000 Iterations
|
|
|
Inline
|
Evaluate
|
|
Run 1
|
14375
|
11672
|
|
Run 2
|
14250
|
20187
|
|
Run 3
|
17140
|
20828
|
|
Run 4
|
18328
|
11735
|
|
Run 5
|
20453
|
20125
|
|
Average
|
16909.2
|
16909.4
|
Roland
From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Rinaldi
Sent: Thursday, May 18, 2006 11:05
AM
To: [email protected]
Subject: SPAM: Re: [CFCDev]
CFINVOKE vs. Evaluate
I only recently started watching
this thread, but this seems to me that the "avoid evaluate()" rule
generally doesn't have much documented justification (though I am not arguing
that it isn't valid - just that I have rarely seen much documentation on the differences
- if I missed some earlier in this thread I apologize in advance). The
ColdFusion MX Coding Guidlines only says the following under Performance
"Don'ts":
"Don't
use evaluate() - Avoid evaluate() unless there is no
other way to write your code (and there is almost always another way to write
your code)."
A
Google search only comes up with the following posts (the first being recent
and the second a couple years old):
http://cfprimer.blogspot.com/2005/03/avoid-evaluate.html
http://www.sitepoint.com/blogs/2004/02/19/running-performance-metrics-on-coldfusion-functions-and-operators/
An MXNA search comes up with some more recent posts:
http://www.succor.co.uk/index.cfm/2006/4/13/Avoid-evaluate-always
http://www.blogoffusion.com/index.cfm/2006/4/18/Structure-style-evaluation-rocks
However, nobody seems to offer specific metrics (except for one that came to
the conclusion that the differences were minimal). Let me be clear, I am not
arguing that this isn't a completely valid best practice - I am sure at some
point it was based upon some documented metrics, but it would be nice to see
them.
- Brian Rinaldi
blog: http://www.remotesynthesis.com/blog
ColdFusion Open Source List: http://www.remotesynthesis.com/cfopensourcelist
Boston CFUG -
http://www.bostoncfug.org
From: "Nick Tong
- TalkWebSolutions.co.uk" <[EMAIL PROTECTED]>
Sent: Thursday, May 18, 2006 10:49
AM
To: [email protected]
Subject: Re: [CFCDev] CFINVOKE vs.
Evaluate
On 18/05/06, Peter Bell <[EMAIL PROTECTED]>wrote:
> So, would cf invoke actually be any faster?
I think this can depend on if you have initiated the object into memory i.e.
in this case then i believe it is faster
--
Nick Tong
web: http://talkwebsolutions.co.uk
blog: http://succor.co.uk
shorturls: http://wapurl.co.uk
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