Hi Hiroyuki,

Sorry I didn't respond yesterday.  Yesterday was a bit of crazy day...

I suppose that this is still a work in progress. I believe that Demeter works with Larch on Windows, but it is certainly not as easy or convenient yet as it should be.

In the place where Demeter got installed on your computer, there is a folder called \perl\site\bin -- you can look at the properties of the Athena desktop icon to see where that is. In that folder is the "dathena.bat" file which the Athena desktop icon points at.

You should also find a file called "lathena.bat". Try running that or pointing your desktop icon at it instead.

The difference between "lathena.bat" and "dathena.bat" is line 25 that sets an environment variable that Demeter uses to decide which of ifeffit or larch to use.

Obviously, there are number of other ways to get this environment variable set. The bottom line is, yes, there is a switch. The switch is the DEMETER_BACKEND environment variable.

Unfortunately, that switch cannot be in the configuration files, although what you tired in item 2 of your email was a sensible guess. It turns out that the choice of larch/ifeffit has to made long before the configuration files are read.

Do let me know how you get on. While Demeter + larch should work, there are still almost certainly problems. I need to get a new version of the Demeter installer out soon, so it would be nice to get some feedback in this area.

As for using Demeter + larch + 100s of file -- it should work after a fashion. But I worry that Athena's performance might not be what you are hoping for. Athena does a lot of things that are more user-friendly than performance-friendly....


On 08/15/2017 06:10 AM, ASAKURA, Hiroyuki wrote:
Dear all,

I would like to use the latest Larch as backend for Athena and Artemis on Windows to handle hundreds of XAS data (, hopefully).
But, I'm stuck. I would appreciate any comments and suggestions.

Matt announced it is now possible on this list, but I still cannot do it on Windows.

[Ifeffit] Larch 0.9.33

The "server mode" for Athena and Artemis now works on all platforms and I
strongly encourage everyone to use this over the ifeffit back end.

Here is what I did.

Windows 10 Pro (Japanese)
Demeter 0.9.25 (via official website)
Python 3.6 (official distribution)

1. Installation of the latest Larch

git clone https://github.com/xraypy/xraylarch.git (sha1: 5a372cfe1368a8ac10c2ebfc5bef4e9a9a325f6d)
cd xraylarch
python setup.py install
# Some dependency related to XRD is not fulfilled.

2. Start Larch server

cd %LOCALAPPDATA%\Programs\Python\Python36\Scripts
python larch_server start
larch_server port=4966: started

I found a parameter of peakfit backend in demeter.ini and changed to larch, but did not work (as expected).

In the dathena.log, Athena still uses ifeffit as backend.

perl version: v5.18.2
backend: ifeffit

Should I compile Demeter package by myself to use the Larch backend?
Or, is there any "switch" to use Larch?

Thanks in advance,

ASAKURA, Hiroyuki

 Bruce Ravel  ------------------------------------ bra...@bnl.gov

 National Institute of Standards and Technology
 Synchrotron Science Group at NSLS-II
 Building 743, Room 114
 Upton NY, 11973

 Homepage:    http://bruceravel.github.io/home/
 Software:    https://github.com/bruceravel
 Demeter:     http://bruceravel.github.io/demeter/
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