On Fri, Sep 21, 2012 at 10:49 AM, Luke Lee <durdenm...@gmail.com> wrote:
> Hi again,
>
> I haven't been getting the updates via email so I'm attempting to post
> again to respond.
>
> Thanks everyone for the suggestions. I have a few questions:
>
> 1. What is the benefit of using the stand-alone carray project (
> https://github.com/FrancescAlted/carray) vs Pytables.carray?
>
Hello Luke,
carrays are in-memory, not on disk.
> 2. I realized my code base never uses the query functionality of a Table.
> So, I changed all my columns to be just Pytables.carray objects instead.
> They are all sitting at the top of the hierarchy, just below root. Is
> this a good idea?
>
> I see a big speed increase from this obviously because now everything is
> stored contiguously. However, are there any downsides to doing this? I
> suppose I could also use EArray, but we are never actually changing the
> data once it is stored in HDF5.
>
If it works for you, then great!
> 3. Is compression automatically happening with the Carray? I know the
> documentation says that compression is supported, but what do I need to do
> to enable it? Maybe it's already happening and this is contributing to my
> big speed improvement.
>
For compression to be enabled, you need to define the appropriate filter
[1] on either the node or the file.
4. I would certainly love to take a look at contributing something like
> this in my free time. I don't have a whole lot at this time so the changes
> could take a while. I'm sure I need to learn a lot more about the codebase
> before really giving it a try. I'm going to take a look at this though,
> thanks for the suggestion!
>
No problem ;)
> 5. How do I subscribe to the dev mailing list? I only see announcements
> and users.
>
Here is the dev list site:
https://groups.google.com/forum/?fromgroups#!forum/pytables-dev
> 6. Any idea why I'm not getting the emails from the list? I signed up 2
> days ago and didn't get any of your replies via email.
>
We have been having problems with this list. I think It might be time to
transition...
Be Well
Anthony
1.
http://pytables.github.com/usersguide/libref/helper_classes.html?highlight=filter#tables.Filters
>
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