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#!/usr/bin/env python3
#
# Copyright (c) 2017-2018 Weitian LI <weitian@aaronly.me>
# MIT License
#
# Run OSKAR interferometer simulator, with corresponding settings
# applied to the common configurations.
#
# OSKAR settings doc:
# http://www.oerc.ox.ac.uk/~ska/oskar2/OSKAR-Settings.pdf
#
import os
import re
import argparse
import subprocess
import shutil
from time import time
OSKAR_BIN = os.environ.get("OSKAR_BIN", "oskar_sim_interferometer")
print("OSKAR simulator: %s" % OSKAR_BIN)
def file_len(fname):
"""
Get the number of lines of a text file.
Credit: https://stackoverflow.com/q/845058/4856091
"""
with open(fname) as f:
for i, l in enumerate(f):
pass
return i+1
def run_oskar(configfile, model, freq, vis_ms, vis_oskar=None,
telescope=None, chunksize=None, double_precision=None,
use_gpus=None, gpu_ids=None, num_devices=None,
dryrun=False):
"""
Update simulation settings in the configuration file,
and run the simulator ``oskar_sim_interferometer``.
"""
if chunksize is not None:
chunksize = int(chunksize)
if vis_ms is None and vis_oskar is None:
raise ValueError("both 'vis_oskar' & 'vis_ms' are missing")
print("Updating simulation settings ...")
for item, value in [
("simulator/max_sources_per_chunk", chunksize),
("simulator/double_precision", double_precision),
("simulator/use_gpus", use_gpus),
("simulator/cuda_device_ids", gpu_ids),
("simulator/num_devices", num_devices),
("sky/oskar_sky_model/file", model),
("telescope/input_directory", telescope),
("observation/start_frequency_hz", freq*1e6), # [MHz] -> [Hz]
("interferometer/oskar_vis_filename", vis_oskar),
("interferometer/ms_filename", vis_ms)]:
if value is not None:
subprocess.check_call([OSKAR_BIN, "--set",
configfile, item, str(value)])
print("Updated '%s' -> '%s'" % (item, str(value)))
print("-------------------------------------------------------------")
print("Simulating %s @ %.2f [MHz] ..." % (model, freq))
cmd = [OSKAR_BIN, configfile]
print("CWD: %s" % os.getcwd())
print("CMD: %s" % " ".join(cmd))
if dryrun:
print("Dry run mode -> DONE!")
else:
tstart = time()
subprocess.check_call(cmd)
tcost = time() - tstart
if tcost <= 3*60:
print("Elapsed time: %.1f [sec]" % tcost)
else:
print("Elapsed time: %.1f [min]" % (tcost/60))
print("-------------------------------------------------------------")
def main():
default_fconfig = "sim_interferometer.f{freq:06.2f}.ini"
parser = argparse.ArgumentParser(
description="Run OSKAR simulator on a list of sky models",
epilog="NOTE: use env variable 'OSKAR_BIN' to manually specify the " +
"path to the simulator: 'oskar_sim_interferometer'")
parser.add_argument("-d", "--dry-run", dest="dryrun", action="store_true",
help="dry run")
parser.add_argument("-c", "--config", dest="config", required=True,
help="OSKAR base/common configuration file")
parser.add_argument("-C", "--fconfig", dest="fconfig",
default=default_fconfig,
help="filename pattern of the configuration files " +
"updated for OSKAR usage " +
"(default: %s)" % default_fconfig)
parser.add_argument("-S", "--max-chunk", dest="chunk_max", type=float,
help="maximum allowed chunk size; if the input " +
"sky model has less sources than this maximum " +
"chunk size, then use the input source number " +
"as the simulation chunk size.")
parser.add_argument("--vis-oskar", dest="vis_oskar",
action="store_true",
help="also save visibility in OSKAR native format")
parser.add_argument("-t", "--telescope", dest="telescope",
help="overwrite the telescope model in config file")
parser.add_argument("-o", "--outdir", dest="outdir",
default="visibility",
help="simulated visibility output directory " +
"(default: 'visibility/')")
parser.add_argument("--num-devices", dest="num_devices",
type=int, default=None,
help="number of CPU threads to use")
parser.add_argument("--gpu-ids", dest="gpu_ids", default=None,
help="comma-separated GPU device IDs to use; " +
"(default: use all GPU devices)")
exgrp1 = parser.add_mutually_exclusive_group()
exgrp1.add_argument("--use-gpu", dest="use_gpu", action="store_true",
help="force to only use GPUs")
exgrp1.add_argument("--use-cpu", dest="use_cpu", action="store_true",
help="force to only use CPUs")
exgrp2 = parser.add_mutually_exclusive_group()
exgrp2.add_argument("--use-double", dest="use_double", action="store_true",
help="use double-precision float numbers")
exgrp2.add_argument("--use-single", dest="use_single", action="store_true",
help="use single-precision float numbers")
exgrp3 = parser.add_mutually_exclusive_group(required=True)
exgrp3.add_argument("-l", "--list", dest="listfile",
help="list of frequencies [MHz] and input sky models")
exgrp3.add_argument("-i", "--items", dest="items", nargs="+",
help="list of sky model items in format of " +
"'<freq[MHz]>:<skymodel-file>'")
args = parser.parse_args()
tstart = time()
use_gpus = None
if args.use_gpu:
use_gpus = True
elif args.use_cpu:
use_gpus = False
double_precision = None
if args.use_double:
double_precision = True
elif args.use_single:
double_precision = False
if not os.path.exists(args.outdir):
os.mkdir(args.outdir)
print("Created output visibility directory: %s" % args.outdir)
skymodels = []
if args.listfile:
for line in open(args.listfile).readlines():
if re.match(r"^(\s*$|\s*#)", line):
continue
freq, skyfile = line.strip().split()
freq = float(freq)
skymodels.append((freq, skyfile))
else:
for item in args.items:
freq, skyfile = item.split(":")
freq = float(freq)
skymodels.append((freq, skyfile))
Nosm = len(skymodels)
print("Number of sky models: %d" % Nosm)
for i, (freq, skyfile) in enumerate(skymodels):
print("=============================================================")
print("[%d/%d] %s @ %.2f [MHz]" % (i+1, Nosm, skyfile, freq))
print("-------------------------------------------------------------")
Nsrc = file_len(skyfile)
print("Number of sources: ~{:,}".format(Nsrc))
chunksize = args.chunk_max
if chunksize and chunksize > Nsrc:
chunksize = Nsrc
basename = os.path.splitext(os.path.basename(skyfile))[0]
if args.vis_oskar:
vis_oskar = os.path.join(args.outdir, basename+".oskar")
else:
vis_oskar = None
vis_ms = os.path.join(args.outdir, basename+".ms")
configfile = args.fconfig.format(freq=freq)
shutil.copy(args.config, configfile)
print("Copied OSKAR configuration file as: %s" % configfile)
run_oskar(configfile=configfile, freq=freq,
model=skyfile, vis_ms=vis_ms, vis_oskar=vis_oskar,
telescope=args.telescope, chunksize=chunksize,
double_precision=double_precision,
use_gpus=use_gpus, gpu_ids=args.gpu_ids,
num_devices=args.num_devices, dryrun=args.dryrun)
tcost = time() - tstart
print("=============================================================")
if tcost <= 3*60:
print("Total elapsed time: %.1f [sec]" % tcost)
else:
print("Total elapsed time: %.1f [min]" % (tcost/60))
if __name__ == "__main__":
main()
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