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Commit 9ebe93ba authored by David Keitel's avatar David Keitel

Merge branch 'ephem-handling' into 'master'

ephemerides handling fixes

See merge request !25
parents e192147c f94ea43b
......@@ -12,9 +12,10 @@ we have a number of scripts demonstrating different use cases.
## Installation
### `python` installation
The scripts are written in `python 2.7+` and therefore require a working
`python` installation. While many systems come with a system wide python
### python installation
This package works best with `python3.5+`,
with higher versions to be required soon.
While many systems come with a system wide python
installation, it can often be easier to manage a user-specific python
installation. This way one does not require root access to install or remove
modules. One method to do this, is to use the `conda` system, either through
......@@ -82,7 +83,7 @@ $ ./configure --prefix=${HOME}/lalsuite-install --disable-all-lal --enable-lalpu
### `pyfstat` installation
### PyFstat installation
The module and associated scripts can be installed system wide (or to the currently active venv),
assuming you are in the source directory, via
......@@ -97,14 +98,37 @@ $ python -c 'import pyfstat'
if no error message is output, then you have installed `pyfstat`. Note that
the module will be installed to whichever python executable you call it from.
### Ephemeris installation
The scripts require paths to earth and sun ephemeris files in order to use the
`lalpulsar.ComputeFstat` module. This should be automatically picked up from
the $LALPULSAR_DATADIR environment variable, defaulting to the
00-40-DE421 ephemerides or 00-19-DE421 as a backup.
Alternatively, these can either be manually specified when initialising
each search (as one of the arguments), or simply by placing a file
### Ephemerides installation
PyFstat requires paths to earth and sun ephemerides files
in order to use the `lalpulsar.ComputeFstat` module and various `lalapps` tools.
If you have done `pip install lalsuite`,
you need to manually download at least these two files:
* [earth00-40-DE405.dat.gz](
* [sun00-40-DE405.dat.gz](
(Other ephemerides versions exist, but these should be sufficient for most applications.)
You then need to tell PyFstat where to find these files,
by either setting an environment variable $LALPULSAR_DATADIR
or by creating a `~/.pyfstat.conf` file as described further below.
If you are working with a virtual environment,
you should be able to get a full working ephemerides installation with these commands:
mkdir $VIRTUAL_ENV/share/lalpulsar
wget -P $VIRTUAL_ENV/share/lalpulsar
wget -P $VIRTUAL_ENV/share/lalpulsar
echo 'export LALPULSAR_DATADIR=$VIRTUAL_ENV/share/lalpulsar' >> ${VIRTUAL_ENV}/bin/activate
source path/to/venv/bin/activate
If instead you have built and installed lalsuite from source,
and set your path up properly through something like
`source $MYLALPATH/etc/`,
then the ephemerides path should be automatically picked up from
the $LALPULSAR_DATADIR environment variable.
Alternatively, you can place a file
`~/.pyfstat.conf` into your home directory which looks like
......@@ -113,6 +137,9 @@ sun_ephem = '/home/<USER>/lalsuite-install/share/lalpulsar/sun00-19-DE421.dat.gz
Paths set in this way will take precedence over the environment variable.
Finally, you can manually specify ephemerides files when initialising
each PyFstat search (as one of the arguments).
### Contributors
* Greg Ashton
......@@ -159,6 +159,8 @@ def predict_fstat(
""" Wrapper to lalapps_PredictFstat
......@@ -201,6 +203,11 @@ def predict_fstat(
if earth_ephem is not None:
if sun_ephem is not None:
cl_pfs = " ".join(cl_pfs)
d = read_par(filename=tempory_filename)
......@@ -345,7 +352,8 @@ class BaseSearchClass(object):
Paths of the two files containing positions of Earth and Sun,
respectively at evenly spaced times, as passed to CreateFstatInput
Note: If not manually set, default values in ~/.pyfstat are used
Note: If not manually set, default values from get_ephemeris_files()
are used (looking in ~/.pyfstat or $LALPULSAR_DATADIR)
......@@ -353,8 +361,12 @@ class BaseSearchClass(object):
if earth_ephem is None:
self.earth_ephem = earth_ephem_default
self.earth_ephem = earth_ephem
if sun_ephem is None:
self.sun_ephem = sun_ephem_default
self.sun_ephem = sun_ephem
class ComputeFstat(BaseSearchClass):
......@@ -146,15 +146,24 @@ def get_ephemeris_files():
earth_ephem = None
sun_ephem = None
elif env_var in list(os.environ.keys()):
earth_ephem = os.path.join(os.environ[env_var], "earth00-40-DE421.dat.gz")
sun_ephem = os.path.join(os.environ[env_var], "sun00-40-DE421.dat.gz")
ephem_version = "DE405"
earth_ephem = os.path.join(
os.environ[env_var], "earth00-40-{:s}.dat.gz".format(ephem_version)
sun_ephem = os.path.join(
os.environ[env_var], "sun00-40-{:s}.dat.gz".format(ephem_version)
if not (os.path.isfile(earth_ephem) and os.path.isfile(sun_ephem)):
earth_ephem = os.path.join(os.environ[env_var], "earth00-19-DE421.dat.gz")
sun_ephem = os.path.join(os.environ[env_var], "sun00-19-DE421.dat.gz")
earth_ephem = os.path.join(
os.environ[env_var], "earth00-19-{:s}.dat.gz".format(ephem_version)
sun_ephem = os.path.join(
os.environ[env_var], "sun00-19-{:s}.dat.gz".format(ephem_version)
if not (os.path.isfile(earth_ephem) and os.path.isfile(sun_ephem)):
"No [earth/sun]00-[19/40]-DE421 ephemerides "
"found in the " + os.environ[env_var] + " directory. " + please
"Default [earth/sun]00-[19/40]-" + ephem_version + " ephemerides "
"not found in the " + os.environ[env_var] + " directory. " + please
earth_ephem = None
sun_ephem = None
......@@ -368,3 +377,16 @@ def twoFDMoffThreshold(
return twoFDMoffthreshold_below_threshold
return 10 ** (prefactor * np.log10(twoFon - offset))
def match_commandlines(cl1, cl2, be_strict_about_full_executable_path=False):
""" Check if two commandlines match element-by-element, regardless of order """
cl1s = cl1.split(" ")
cl2s = cl2.split(" ")
# first item will be the executable name
# by default be generous here and do not worry about full paths
if not be_strict_about_full_executable_path:
cl1s[0] = os.path.basename(cl1s[0])
cl2s[0] = os.path.basename(cl2s[0])
unmatched = np.setxor1d(cl1s, cl2s)
return len(unmatched) == 0
......@@ -259,38 +259,65 @@ transientTau = {:10.0f}\n"""
def check_cached_data_okay_to_use(self, cl_mfd):
""" Check if cached data exists and, if it does, if it can be used """
getmtime = os.path.getmtime
need_new = "Will create new SFT file.""Checking if cached data good to reuse...")
if os.path.isfile(self.sftfilepath) is False:"No SFT file matching {} found".format(self.sftfilepath))
return False
else:"Matching SFT file found")
if getmtime(self.sftfilepath) < getmtime(self.config_file_name):
"The config file {} has been modified since the sft file {} "
+ "was created"
).format(self.config_file_name, self.sftfilepath)
"No SFT file matching {} found. {}".format(self.sftfilepath, need_new)
return False
else:"OK: Matching SFT file found.")
if "injectionSources" in cl_mfd:
if os.path.isfile(self.config_file_name):
if os.path.getmtime(self.sftfilepath) < os.path.getmtime(
"The config file {} has been modified since the SFT file {} "
+ "was created. {}"
).format(self.config_file_name, self.sftfilepath, need_new)
return False
"OK: The config file {} is older than the SFT file {}".format(
self.config_file_name, self.sftfilepath
# NOTE: at this point we assume it's safe to re-use, since
# check_if_cff_file_needs_rewritting()
# should have already been called before
raise RuntimeError(
"Commandline requires file '{}' but it is missing.".format(
"The config file {} is older than the sft file {}".format(
self.config_file_name, self.sftfilepath
)"Checking contents of cff file")"Checking new commandline against existing SFT header...")
cl_dump = "lalapps_SFTdumpheader {} | head -n 20".format(self.sftfilepath)
output = helper_functions.run_commandline(cl_dump)
found = [True for line in output.split("\n") if line[-len(cl_mfd) :] == cl_mfd]
if any(found):"Contents matched, use old sft file")
return True
else:"Contents unmatched, create new sft file")
header_lines_lalapps = [
line for line in output.split("\n") if "lalapps" in line
if len(header_lines_lalapps) == 0:
"Could not obtain comparison commandline from old SFT header. "
+ need_new
return False
cl_old = header_lines_lalapps[0]
if not helper_functions.match_commandlines(cl_old, cl_mfd):"Commandlines unmatched. " + need_new)
return False
else:"OK: Commandline matched with old SFT header.")"Looks like cached data matches current options, will re-use it!")
return True
def check_if_cff_file_needs_rewritting(self, content):
""" Check if the .cff file has changed
......@@ -298,24 +325,27 @@ transientTau = {:10.0f}\n"""
Returns True if the file should be overwritten - where possible avoid
overwriting to allow cached data to be used
""""Checking if we can re-use injection config file...")
if os.path.isfile(self.config_file_name) is False:"No config file {} found".format(self.config_file_name))"No config file {} found.".format(self.config_file_name))
return True
else:"Config file {} already exists".format(self.config_file_name))"Config file {} already exists.".format(self.config_file_name))
with open(self.config_file_name, "r") as f:
file_content =
if file_content == content:
"File contents match, no update of {} required".format(
"File contents match, no update of {} required.".format(
return False
"File contents unmatched, updating {}".format(self.config_file_name)
"File contents unmatched, updating {}.".format(
return True
......@@ -350,10 +380,16 @@ transientTau = {:10.0f}\n"""
if self.h0 != 0:
earth_ephem = getattr(self, "earth_ephem", None)
sun_ephem = getattr(self, "sun_ephem", None)
if earth_ephem is not None:
if sun_ephem is not None:
cl_mfd = " ".join(cl_mfd)
if self.check_cached_data_okay_to_use(cl_mfd) is False:
check_ok = self.check_cached_data_okay_to_use(cl_mfd)
if check_ok is False:
def predict_fstat(self):
......@@ -371,6 +407,8 @@ transientTau = {:10.0f}\n"""
) # detectors OR IFO?
return twoF_expected
......@@ -435,6 +473,7 @@ class GlitchWriter(Writer):
see `lalapps_Makefakedata_v5 --help` for help with the other paramaters
......@@ -754,6 +793,12 @@ class FrequencyModulatedArtifactWriter(Writer):
earth_ephem = getattr(self, "earth_ephem", None)
sun_ephem = getattr(self, "sun_ephem", None)
if earth_ephem is not None:
if sun_ephem is not None:
cl_mfd = " ".join(cl_mfd)
helper_functions.run_commandline(cl_mfd, log_level=10)
......@@ -80,12 +80,16 @@ class Writer(Test):
Writer = pyfstat.Writer(self.label, outdir=self.outdir, duration=3600)
if os.path.isfile(Writer.sftfilepath):
# first run: make everything from scratch
time_first = os.path.getmtime(Writer.sftfilepath)
# second run: should re-use .cff and .sft
time_second = os.path.getmtime(Writer.sftfilepath)
self.assertTrue(time_first == time_second)
# third run: touch the .cff to force regeneration
time.sleep(1) # make sure timestamp is actually different!
os.system("touch {}".format(Writer.config_file_name))
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