void oskar_imager_check_init(oskar_Imager* h, int* status)
{
/* Don't initialise if we're in "coords only" mode. */
if (h->coords_only) return;
oskar_timer_resume(h->tmr_init);
switch (h->algorithm)
{
case OSKAR_ALGORITHM_DFT_2D:
case OSKAR_ALGORITHM_DFT_3D:
{
if (!h->l)
oskar_imager_init_dft(h, status);
break;
}
case OSKAR_ALGORITHM_FFT:
{
if (!h->conv_func)
oskar_imager_init_fft(h, status);
break;
}
case OSKAR_ALGORITHM_WPROJ:
{
if (!h->w_kernels)
oskar_imager_init_wproj(h, status);
break;
}
default:
*status = OSKAR_ERR_FUNCTION_NOT_AVAILABLE;
}
oskar_timer_pause(h->tmr_init);
}
void oskar_simulator_write_block(oskar_Simulator* h,
const oskar_VisBlock* block, int block_index, int* status)
{
if (*status) return;
/* Open files only if required, and write the block into them. */
oskar_timer_resume(h->tmr_write);
#ifndef OSKAR_NO_MS
if (h->ms_name && !h->ms)
h->ms = oskar_vis_header_write_ms(h->header, h->ms_name, OSKAR_TRUE,
h->force_polarised_ms, status);
if (h->ms) oskar_vis_block_write_ms(block, h->header, h->ms, status);
#endif
if (h->vis_name && !h->vis)
h->vis = oskar_vis_header_write(h->header, h->vis_name, status);
if (h->vis) oskar_vis_block_write(block, h->vis, block_index, status);
oskar_timer_pause(h->tmr_write);
}
static void sim_baselines(oskar_Simulator* h, DeviceData* d, oskar_Sky* sky,
int channel_index_block, int time_index_block,
int time_index_simulation, int* status)
{
int num_baselines, num_stations, num_src, num_times_block, num_channels;
double dt_dump_days, t_start, t_dump, gast, frequency, ra0, dec0;
const oskar_Mem *x, *y, *z;
oskar_Mem* alias = 0;
/* Get dimensions. */
num_baselines = oskar_telescope_num_baselines(d->tel);
num_stations = oskar_telescope_num_stations(d->tel);
num_src = oskar_sky_num_sources(sky);
num_times_block = oskar_vis_block_num_times(d->vis_block);
num_channels = oskar_vis_block_num_channels(d->vis_block);
/* Return if there are no sources in the chunk,
* or if block time index requested is outside the valid range. */
if (num_src == 0 || time_index_block >= num_times_block) return;
/* Get the time and frequency of the visibility slice being simulated. */
dt_dump_days = h->time_inc_sec / 86400.0;
t_start = h->time_start_mjd_utc;
t_dump = t_start + dt_dump_days * (time_index_simulation + 0.5);
gast = oskar_convert_mjd_to_gast_fast(t_dump);
frequency = h->freq_start_hz + channel_index_block * h->freq_inc_hz;
/* Scale source fluxes with spectral index and rotation measure. */
oskar_sky_scale_flux_with_frequency(sky, frequency, status);
/* Evaluate station u,v,w coordinates. */
ra0 = oskar_telescope_phase_centre_ra_rad(d->tel);
dec0 = oskar_telescope_phase_centre_dec_rad(d->tel);
x = oskar_telescope_station_true_x_offset_ecef_metres_const(d->tel);
y = oskar_telescope_station_true_y_offset_ecef_metres_const(d->tel);
z = oskar_telescope_station_true_z_offset_ecef_metres_const(d->tel);
oskar_convert_ecef_to_station_uvw(num_stations, x, y, z, ra0, dec0, gast,
d->u, d->v, d->w, status);
/* Set dimensions of Jones matrices. */
if (d->R)
oskar_jones_set_size(d->R, num_stations, num_src, status);
if (d->Z)
oskar_jones_set_size(d->Z, num_stations, num_src, status);
oskar_jones_set_size(d->J, num_stations, num_src, status);
oskar_jones_set_size(d->E, num_stations, num_src, status);
oskar_jones_set_size(d->K, num_stations, num_src, status);
/* Evaluate station beam (Jones E: may be matrix). */
oskar_timer_resume(d->tmr_E);
oskar_evaluate_jones_E(d->E, num_src, OSKAR_RELATIVE_DIRECTIONS,
oskar_sky_l(sky), oskar_sky_m(sky), oskar_sky_n(sky), d->tel,
gast, frequency, d->station_work, time_index_simulation, status);
oskar_timer_pause(d->tmr_E);
#if 0
/* Evaluate ionospheric phase (Jones Z: scalar) and join with Jones E.
* NOTE this is currently only a CPU implementation. */
if (d->Z)
{
oskar_evaluate_jones_Z(d->Z, num_src, sky, d->tel,
&settings->ionosphere, gast, frequency, &(d->workJonesZ),
status);
oskar_timer_resume(d->tmr_join);
oskar_jones_join(d->E, d->Z, d->E, status);
oskar_timer_pause(d->tmr_join);
}
#endif
/* Evaluate parallactic angle (Jones R: matrix), and join with Jones Z*E.
* TODO Move this into station beam evaluation instead. */
if (d->R)
{
oskar_timer_resume(d->tmr_E);
oskar_evaluate_jones_R(d->R, num_src, oskar_sky_ra_rad_const(sky),
oskar_sky_dec_rad_const(sky), d->tel, gast, status);
oskar_timer_pause(d->tmr_E);
oskar_timer_resume(d->tmr_join);
oskar_jones_join(d->R, d->E, d->R, status);
oskar_timer_pause(d->tmr_join);
}
/* Evaluate interferometer phase (Jones K: scalar). */
oskar_timer_resume(d->tmr_K);
oskar_evaluate_jones_K(d->K, num_src, oskar_sky_l_const(sky),
oskar_sky_m_const(sky), oskar_sky_n_const(sky), d->u, d->v, d->w,
frequency, oskar_sky_I_const(sky),
h->source_min_jy, h->source_max_jy, status);
oskar_timer_pause(d->tmr_K);
/* Join Jones K with Jones Z*E. */
oskar_timer_resume(d->tmr_join);
oskar_jones_join(d->J, d->K, d->R ? d->R : d->E, status);
oskar_timer_pause(d->tmr_join);
/* Create alias for auto/cross-correlations. */
oskar_timer_resume(d->tmr_correlate);
alias = oskar_mem_create_alias(0, 0, 0, status);
/* Auto-correlate for this time and channel. */
if (oskar_vis_block_has_auto_correlations(d->vis_block))
{
oskar_mem_set_alias(alias,
oskar_vis_block_auto_correlations(d->vis_block),
num_stations *
(num_channels * time_index_block + channel_index_block),
num_stations, status);
oskar_auto_correlate(alias, num_src, d->J, sky, status);
}
/* Cross-correlate for this time and channel. */
if (oskar_vis_block_has_cross_correlations(d->vis_block))
{
oskar_mem_set_alias(alias,
oskar_vis_block_cross_correlations(d->vis_block),
num_baselines *
(num_channels * time_index_block + channel_index_block),
num_baselines, status);
oskar_cross_correlate(alias, num_src, d->J, sky, d->tel,
d->u, d->v, d->w, gast, frequency, status);
}
/* Free alias for auto/cross-correlations. */
oskar_mem_free(alias, status);
oskar_timer_pause(d->tmr_correlate);
}
void oskar_simulator_run_block(oskar_Simulator* h, int block_index,
int device_id, int* status)
{
double obs_start_mjd, dt_dump_days;
int i_active, time_index_start, time_index_end;
int num_channels, num_times_block, total_chunks, total_times;
DeviceData* d;
if (*status) return;
/* Check that initialisation has happened. We can't initialise here,
* as we're already multi-threaded at this point. */
if (!h->header)
{
*status = OSKAR_ERR_MEMORY_NOT_ALLOCATED;
oskar_log_error(h->log, "Simulator not initalised. "
"Call oskar_simulator_check_init() first.");
return;
}
#ifdef _OPENMP
if (!h->coords_only)
{
/* Disable any nested parallelism. */
omp_set_num_threads(1);
omp_set_nested(0);
}
#endif
/* Set the GPU to use. (Supposed to be a very low-overhead call.) */
if (device_id >= 0 && device_id < h->num_gpus)
oskar_device_set(h->gpu_ids[device_id], status);
/* Clear the visibility block. */
i_active = block_index % 2; /* Index of the active buffer. */
d = &(h->d[device_id]);
oskar_timer_resume(d->tmr_compute);
oskar_vis_block_clear(d->vis_block, status);
/* Set the visibility block meta-data. */
total_chunks = h->num_sky_chunks;
num_channels = h->num_channels;
total_times = h->num_time_steps;
obs_start_mjd = h->time_start_mjd_utc;
dt_dump_days = h->time_inc_sec / 86400.0;
time_index_start = block_index * h->max_times_per_block;
time_index_end = time_index_start + h->max_times_per_block - 1;
if (time_index_end >= total_times)
time_index_end = total_times - 1;
num_times_block = 1 + time_index_end - time_index_start;
/* Set the number of active times in the block. */
oskar_vis_block_set_num_times(d->vis_block, num_times_block, status);
oskar_vis_block_set_start_time_index(d->vis_block, time_index_start);
/* Go though all possible work units in the block. A work unit is defined
* as the simulation for one time and one sky chunk. */
while (!h->coords_only)
{
oskar_Sky* sky;
int i_work_unit, i_chunk, i_time, i_channel, sim_time_idx;
oskar_mutex_lock(h->mutex);
i_work_unit = (h->work_unit_index)++;
oskar_mutex_unlock(h->mutex);
if ((i_work_unit >= num_times_block * total_chunks) || *status) break;
/* Convert slice index to chunk/time index. */
i_chunk = i_work_unit / num_times_block;
i_time = i_work_unit - i_chunk * num_times_block;
sim_time_idx = time_index_start + i_time;
/* Copy sky chunk to device only if different from the previous one. */
if (i_chunk != d->previous_chunk_index)
{
oskar_timer_resume(d->tmr_copy);
oskar_sky_copy(d->chunk, h->sky_chunks[i_chunk], status);
oskar_timer_pause(d->tmr_copy);
}
sky = h->apply_horizon_clip ? d->chunk_clip : d->chunk;
/* Apply horizon clip if required. */
if (h->apply_horizon_clip)
{
double gast, mjd;
mjd = obs_start_mjd + dt_dump_days * (sim_time_idx + 0.5);
gast = oskar_convert_mjd_to_gast_fast(mjd);
oskar_timer_resume(d->tmr_clip);
oskar_sky_horizon_clip(d->chunk_clip, d->chunk, d->tel, gast,
d->station_work, status);
oskar_timer_pause(d->tmr_clip);
}
/* Simulate all baselines for all channels for this time and chunk. */
for (i_channel = 0; i_channel < num_channels; ++i_channel)
{
if (*status) break;
if (h->log)
{
oskar_mutex_lock(h->mutex);
oskar_log_message(h->log, 'S', 1, "Time %*i/%i, "
"Chunk %*i/%i, Channel %*i/%i [Device %i, %i sources]",
disp_width(total_times), sim_time_idx + 1, total_times,
disp_width(total_chunks), i_chunk + 1, total_chunks,
disp_width(num_channels), i_channel + 1, num_channels,
device_id, oskar_sky_num_sources(sky));
oskar_mutex_unlock(h->mutex);
}
sim_baselines(h, d, sky, i_channel, i_time, sim_time_idx, status);
}
d->previous_chunk_index = i_chunk;
}
/* Copy the visibility block to host memory. */
oskar_timer_resume(d->tmr_copy);
oskar_vis_block_copy(d->vis_block_cpu[i_active], d->vis_block, status);
oskar_timer_pause(d->tmr_copy);
oskar_timer_pause(d->tmr_compute);
}
void oskar_imager_read_coords_ms(oskar_Imager* h, const char* filename,
int i_file, int num_files, int* percent_done, int* percent_next,
int* status)
{
#ifndef OSKAR_NO_MS
oskar_MeasurementSet* ms;
oskar_Mem *uvw, *u, *v, *w, *weight, *time_centroid;
int num_channels, num_stations, num_baselines, num_pols;
int start_row, num_rows;
double *uvw_, *u_, *v_, *w_;
if (*status) return;
/* Read the header. */
ms = oskar_ms_open(filename);
if (!ms)
{
*status = OSKAR_ERR_FILE_IO;
return;
}
num_rows = (int) oskar_ms_num_rows(ms);
num_stations = (int) oskar_ms_num_stations(ms);
num_baselines = num_stations * (num_stations - 1) / 2;
num_pols = (int) oskar_ms_num_pols(ms);
num_channels = (int) oskar_ms_num_channels(ms);
/* Set visibility meta-data. */
oskar_imager_set_vis_frequency(h,
oskar_ms_freq_start_hz(ms),
oskar_ms_freq_inc_hz(ms), num_channels);
oskar_imager_set_vis_phase_centre(h,
oskar_ms_phase_centre_ra_rad(ms) * 180/M_PI,
oskar_ms_phase_centre_dec_rad(ms) * 180/M_PI);
/* Create arrays. */
uvw = oskar_mem_create(OSKAR_DOUBLE, OSKAR_CPU, 3 * num_baselines, status);
u = oskar_mem_create(OSKAR_DOUBLE, OSKAR_CPU, num_baselines, status);
v = oskar_mem_create(OSKAR_DOUBLE, OSKAR_CPU, num_baselines, status);
w = oskar_mem_create(OSKAR_DOUBLE, OSKAR_CPU, num_baselines, status);
weight = oskar_mem_create(OSKAR_SINGLE, OSKAR_CPU,
num_baselines * num_pols, status);
time_centroid = oskar_mem_create(OSKAR_DOUBLE, OSKAR_CPU, num_baselines,
status);
uvw_ = oskar_mem_double(uvw, status);
u_ = oskar_mem_double(u, status);
v_ = oskar_mem_double(v, status);
w_ = oskar_mem_double(w, status);
/* Loop over visibility blocks. */
for (start_row = 0; start_row < num_rows; start_row += num_baselines)
{
int i, block_size;
size_t allocated, required;
if (*status) break;
/* Read coordinates and weights from Measurement Set. */
oskar_timer_resume(h->tmr_read);
block_size = num_rows - start_row;
if (block_size > num_baselines) block_size = num_baselines;
allocated = oskar_mem_length(uvw) *
oskar_mem_element_size(oskar_mem_type(uvw));
oskar_ms_read_column(ms, "UVW", start_row, block_size,
allocated, oskar_mem_void(uvw), &required, status);
allocated = oskar_mem_length(weight) *
oskar_mem_element_size(oskar_mem_type(weight));
oskar_ms_read_column(ms, "WEIGHT", start_row, block_size,
allocated, oskar_mem_void(weight), &required, status);
allocated = oskar_mem_length(time_centroid) *
oskar_mem_element_size(oskar_mem_type(time_centroid));
oskar_ms_read_column(ms, "TIME_CENTROID", start_row, block_size,
allocated, oskar_mem_void(time_centroid), &required, status);
/* Split up baseline coordinates. */
for (i = 0; i < block_size; ++i)
{
u_[i] = uvw_[3*i + 0];
v_[i] = uvw_[3*i + 1];
w_[i] = uvw_[3*i + 2];
}
/* Update the imager with the data. */
oskar_timer_pause(h->tmr_read);
oskar_imager_update(h, block_size, 0, num_channels - 1, num_pols,
u, v, w, 0, weight, time_centroid, status);
*percent_done = (int) round(100.0 * (
(start_row + block_size) / (double)(num_rows * num_files) +
i_file / (double)num_files));
if (h->log && percent_next && *percent_done >= *percent_next)
{
oskar_log_message(h->log, 'S', -2, "%3d%% ...", *percent_done);
*percent_next = 10 + 10 * (*percent_done / 10);
}
}
oskar_mem_free(uvw, status);
oskar_mem_free(u, status);
oskar_mem_free(v, status);
oskar_mem_free(w, status);
oskar_mem_free(weight, status);
oskar_mem_free(time_centroid, status);
oskar_ms_close(ms);
#else
(void) filename;
(void) i_file;
(void) num_files;
(void) percent_done;
(void) percent_next;
oskar_log_error(h->log, "OSKAR was compiled without Measurement Set support.");
*status = OSKAR_ERR_FUNCTION_NOT_AVAILABLE;
#endif
}
void oskar_imager_read_coords_vis(oskar_Imager* h, const char* filename,
int i_file, int num_files, int* percent_done, int* percent_next,
int* status)
{
oskar_Binary* vis_file;
oskar_VisHeader* header;
oskar_Mem *uu, *vv, *ww, *weight, *time_centroid, *time_slice;
int coord_prec, max_times_per_block, tags_per_block, i_block, num_blocks;
int num_times_total, num_stations, num_baselines, num_pols;
double time_start_mjd, time_inc_sec;
if (*status) return;
/* Read the header. */
vis_file = oskar_binary_create(filename, 'r', status);
header = oskar_vis_header_read(vis_file, status);
if (*status)
{
oskar_vis_header_free(header, status);
oskar_binary_free(vis_file);
return;
}
coord_prec = oskar_vis_header_coord_precision(header);
max_times_per_block = oskar_vis_header_max_times_per_block(header);
tags_per_block = oskar_vis_header_num_tags_per_block(header);
num_times_total = oskar_vis_header_num_times_total(header);
num_stations = oskar_vis_header_num_stations(header);
num_baselines = num_stations * (num_stations - 1) / 2;
num_pols = oskar_type_is_matrix(oskar_vis_header_amp_type(header)) ? 4 : 1;
num_blocks = (num_times_total + max_times_per_block - 1) /
max_times_per_block;
time_start_mjd = oskar_vis_header_time_start_mjd_utc(header) * 86400.0;
time_inc_sec = oskar_vis_header_time_inc_sec(header);
/* Set visibility meta-data. */
oskar_imager_set_vis_frequency(h,
oskar_vis_header_freq_start_hz(header),
oskar_vis_header_freq_inc_hz(header),
oskar_vis_header_num_channels_total(header));
oskar_imager_set_vis_phase_centre(h,
oskar_vis_header_phase_centre_ra_deg(header),
oskar_vis_header_phase_centre_dec_deg(header));
/* Create scratch arrays. Weights are all 1. */
uu = oskar_mem_create(coord_prec, OSKAR_CPU, 0, status);
vv = oskar_mem_create(coord_prec, OSKAR_CPU, 0, status);
ww = oskar_mem_create(coord_prec, OSKAR_CPU, 0, status);
time_centroid = oskar_mem_create(OSKAR_DOUBLE,
OSKAR_CPU, num_baselines * max_times_per_block, status);
time_slice = oskar_mem_create_alias(0, 0, 0, status);
weight = oskar_mem_create(h->imager_prec,
OSKAR_CPU, num_baselines * num_pols * max_times_per_block, status);
oskar_mem_set_value_real(weight, 1.0, 0, 0, status);
/* Loop over visibility blocks. */
for (i_block = 0; i_block < num_blocks; ++i_block)
{
int t, num_times, num_channels, start_time, start_chan, end_chan;
int dim_start_and_size[6];
size_t num_rows;
if (*status) break;
/* Read block metadata. */
oskar_timer_resume(h->tmr_read);
oskar_binary_set_query_search_start(vis_file,
i_block * tags_per_block, status);
oskar_binary_read(vis_file, OSKAR_INT,
OSKAR_TAG_GROUP_VIS_BLOCK,
OSKAR_VIS_BLOCK_TAG_DIM_START_AND_SIZE, i_block,
sizeof(dim_start_and_size), dim_start_and_size, status);
start_time = dim_start_and_size[0];
start_chan = dim_start_and_size[1];
num_times = dim_start_and_size[2];
num_channels = dim_start_and_size[3];
num_rows = num_times * num_baselines;
end_chan = start_chan + num_channels - 1;
/* Fill in the time centroid values. */
for (t = 0; t < num_times; ++t)
{
oskar_mem_set_alias(time_slice, time_centroid,
t * num_baselines, num_baselines, status);
oskar_mem_set_value_real(time_slice,
time_start_mjd + (start_time + t + 0.5) * time_inc_sec,
0, num_baselines, status);
}
/* Read the baseline coordinates. */
oskar_binary_read_mem(vis_file, uu, OSKAR_TAG_GROUP_VIS_BLOCK,
OSKAR_VIS_BLOCK_TAG_BASELINE_UU, i_block, status);
oskar_binary_read_mem(vis_file, vv, OSKAR_TAG_GROUP_VIS_BLOCK,
OSKAR_VIS_BLOCK_TAG_BASELINE_VV, i_block, status);
oskar_binary_read_mem(vis_file, ww, OSKAR_TAG_GROUP_VIS_BLOCK,
OSKAR_VIS_BLOCK_TAG_BASELINE_WW, i_block, status);
/* Update the imager with the data. */
oskar_timer_pause(h->tmr_read);
oskar_imager_update(h, num_rows, start_chan, end_chan, num_pols,
uu, vv, ww, 0, weight, time_centroid, status);
*percent_done = (int) round(100.0 * (
(i_block + 1) / (double)(num_blocks * num_files) +
i_file / (double)num_files));
if (h->log && percent_next && *percent_done >= *percent_next)
{
oskar_log_message(h->log, 'S', -2, "%3d%% ...", *percent_done);
*percent_next = 10 + 10 * (*percent_done / 10);
}
}
oskar_mem_free(uu, status);
oskar_mem_free(vv, status);
oskar_mem_free(ww, status);
oskar_mem_free(weight, status);
oskar_mem_free(time_centroid, status);
oskar_mem_free(time_slice, status);
oskar_vis_header_free(header, status);
oskar_binary_free(vis_file);
}