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rounding issues ? [message #73768]

Mon, 12 June 2006 09:39

Florian Georg

Messages: 34
Registered: July 2009

Member

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one more from me:
I'm currently writing a xslt to extract info from *.trcxml files.
As a reference, I use the xml produced by the "Report > Export as XML
report" action.

Now I'm wondering that I have some rounding issues when calculation e.g.
cumulative time.

Example (from *.trcxml):

<methodEntry (...) time="1149838796,296922922" methodIdRef="229896"
ticket="4147030" stackDepth="13"/>
<methodExit (...) time="1149838796,310027122" methodIdRef="229896"
ticket="4147030" overhead="0.000292588"/>

This should result in a cumulative time of 0.0131042 (or 0.012811612 w/o
overhead) - at least according to my Windows calculator ;-)

But the XML exported by TPTP says: cumulativeTime="0.012906737001342773"

Am I missing some nanoseconds in my calculation somewhere, or should
this be considered normal rounding issues?

thanks again,
Florian

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fn:Florian Georg
n:Georg;Florian
org:Innovations Softwaretechnologie GmbH;Product Development
adr:;;Ziegelei 7;Immenstaad;;88090;Germany
email;internet:Florian.Georg@innovations.de
title:Developer
tel;work:+49-7545-202-512
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Re: rounding issues ? [message #73879 is a reply to message #73768]

Mon, 12 June 2006 14:05

Eclipse User

Originally posted by: nmehrega.ca.ibm.com

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Hi Florian,

>I'm currently writing a xslt to extract info from *.trcxml files.
>As a reference, I use the xml produced by the "Report > Export as XML
>report" action.

There are easier ways to get to the XML Trace file. Please see section
5.0 of the following document:
http://www.eclipse.org/tptp/platform/documents/speed_profili ng/speedUpProfiling.html
Also, please consider donating your XSLT to the open source community when
completed.

> This should result in a cumulative time of 0.0131042 (or 0.012811612 w/o

> overhead) - at least according to my Windows calculator ;-)

Does 100th of a second really matter when profiling? This could be a
rounding problem on our part, but it's a minor issue. Developers don't
really care whether their method takes 100th of a second more to execute
so I don't think you should really invest time and effort trying to
resolve these rounding issues.

Navid Mehregani
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 <tt>Hi Florian,</tt>
 
 <tt>>I'm currently writing a xslt to extract info from
*.trcxml files. 
>As a reference, I use the xml produced by the "Report > Export
as XML 
>report" action.</tt>
 
 There are easier ways to get to the
XML Trace file.  Please see section 5.0 of the following document:
http://www.eclipse.org/tptp/platform/documents/speed_profili ng/speedUpProfiling.html
 Also, please consider donating your
XSLT to the open source community when completed.
 
 <tt>> This should result in a cumulative time of 0.0131042
(or 0.012811612 w/o 
> overhead) - at least according to my Windows calculator ;-) 
</tt>
 Does 100th of a second really matter
when profiling?  This could be a rounding problem on our part, but
it's a minor issue.  Developers don't really care whether their method
takes 100th of a second more to execute so I don't think you should really
invest time and effort trying to resolve these rounding issues.
 
 Navid Mehregani
--=_alternative 004D63558525718B_=--

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