[vtk-developers] VTK performance regression

[Dave Partyka]

Hi Søren,

If possible, could you file a bug report anyway on vtk.org/Bug? The
information you provided by narrowing down the commits is invaluable. Filing
a bug report helps make sure this isn't forgotten, and provides a way to
track and assign this issue. Also it would be extremely helpful if you could
provide more information or a simple use case (possibly code) of what
exactly you are doing in VTK.

Thanks!

On Wed, Oct 27, 2010 at 7:35 AM, Will Schroeder
<will.schroeder at kitware.com>wrote:

> Søren-
>
> In the future can you please post this sort of feedback to the VTK
> Developers list? In the mean time I have forwarded your email to the list.
> Thanks,
>
> Will
>
> On Wed, Oct 27, 2010 at 3:25 AM, <Soeren.Holm at hexagon-machine-control.com>wrote:
>
>> Hi Ken And Will
>>
>> I'm writing to you because we have found some performance regression
>> within VTK. I work at a company doing machine control solution for the
>> construction industry. We use VTK to visualize the desired ground surface,
>> the machine and some arrow and such to guide the user.
>>
>> We currently use VTK 5.4.2 but will revert back to using 5.0.4 because of
>> the following two commits.
>>
>> [31b67b4801a09514bcace0e14130048c860d31b8] ENH:Support multiple timers.
>> This checkin defines the API and provides a partial implementation. Platform
>> specific subclasses will extend the behavior of this class to fully
>> implement the changes.
>>
>> [fdeb975c7f1c6f566f4b80c13cf3cd026a37139b] BUG: Fixed problems where
>> multiple observers were being invoked for the same event when one observer
>> invoked another event in the same object.
>>
>> Especially fdeb975c7f1c6f566f4b80c13cf3cd026a37139b makes our cpu usage
>> double. It does not help to any of the commits on 5.4.2 to there must be
>> other regressions after these commits also.
>>
>> Do you have any comments as to what has happened to VTK?
>>
>> I would have filed a bug-report, but I do not  know what actually is
>> wrong.
>>
>> /Søren Holm
>
>
>
>
> --
> William J. Schroeder, PhD
> Kitware, Inc.
> 28 Corporate Drive
> Clifton Park, NY 12065
> will.schroeder at kitware.com
> http://www.kitware.com
> (518) 881-4902
>
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