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Apply SAT on boundaries

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This commit is contained in:
Magnus Ulimoen
2021-08-04 18:30:15 +00:00
parent b11f3c9abb
commit 95897777d6
4 changed files with 330 additions and 150 deletions
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20
multigrid/src/main.rs
View File

@@ -42,6 +42,9 @@ struct CliOptions {
/// in json format
#[argh(switch)]
output_json: bool,
/// distribute the computation on multiple threads
#[argh(switch)]
distribute: bool,
}
#[derive(Default, serde::Serialize)]
@@ -71,7 +74,6 @@ fn main() {
return;
}
};
let parsing::RuntimeConfiguration {
names,
grids,
@@ -109,9 +111,19 @@ fn main() {
let ntime = (integration_time / dt).round() as u64;
{
let nthreads = opt.jobs.unwrap_or(1);
todo!("nthreads");
if opt.distribute {
let sys = sys.distribute(ntime);
let timer = if opt.timings {
Some(std::time::Instant::now())
} else {
None
};
sys.run();
if let Some(timer) = timer {
let duration = timer.elapsed();
println!("Duration: {:?}", duration);
}
return;
}
let should_output = |itime| {

5
multigrid/src/parsing.rs
View File

@@ -168,8 +168,7 @@ impl input::Configuration {
let grid_connections = self
.grids
.iter()
.enumerate()
.map(|(i, (name, g))| {
.map(|(name, g)| {
let default_bc = default.boundary_conditions.clone().unwrap_or_default();
use input::BoundaryType;
g.boundary_conditions
@@ -190,7 +189,7 @@ impl input::Configuration {
name
),
},
Some(BoundaryType::This) => euler::BoundaryCharacteristic::Grid(i),
Some(BoundaryType::This) => euler::BoundaryCharacteristic::This,
Some(BoundaryType::Vortex) => euler::BoundaryCharacteristic::Vortex(
if let BoundaryConditions::Vortex(vortex) = &boundary_conditions {
vortex.clone()

242
multigrid/src/system.rs
View File

@@ -179,7 +179,7 @@ impl System {
/// Spreads the computation over n threads, in a thread per grid way.
/// This system can only be called once for ntime calls.
pub fn distribute(self, ntime: usize) -> DistributedSystem {
pub fn distribute(self, ntime: u64) -> DistributedSystem {
let nthreads = self.grids.len();
let time = 0.0;
// alt: crossbeam::WaitGroup
@@ -199,28 +199,40 @@ impl System {
| euler::BoundaryCharacteristic::Interpolate(i, _) = wb.north()
{
let (s, r) = crossbeam_channel::bounded(1);
pull_channels[*i].south_mut().replace(r).unwrap();
pull_channels[*i]
.south_mut()
.replace(r)
.and_then::<(), _>(|_| panic!("channel is already present"));
*local_push.north_mut() = Some(s);
}
if let euler::BoundaryCharacteristic::Grid(i)
| euler::BoundaryCharacteristic::Interpolate(i, _) = wb.south()
{
let (s, r) = crossbeam_channel::bounded(1);
pull_channels[*i].north_mut().replace(r).unwrap();
pull_channels[*i]
.north_mut()
.replace(r)
.and_then::<(), _>(|_| panic!("channel is already present"));
*local_push.south_mut() = Some(s);
}
if let euler::BoundaryCharacteristic::Grid(i)
| euler::BoundaryCharacteristic::Interpolate(i, _) = wb.east()
{
let (s, r) = crossbeam_channel::bounded(1);
pull_channels[*i].west_mut().replace(r).unwrap();
pull_channels[*i]
.west_mut()
.replace(r)
.and_then::<(), _>(|_| panic!("channel is already present"));
*local_push.east_mut() = Some(s);
}
if let euler::BoundaryCharacteristic::Grid(i)
| euler::BoundaryCharacteristic::Interpolate(i, _) = wb.west()
{
let (s, r) = crossbeam_channel::bounded(1);
pull_channels[*i].east_mut().replace(r).unwrap();
pull_channels[*i]
.east_mut()
.replace(r)
.and_then::<(), _>(|_| panic!("channel is already present"));
*local_push.west_mut() = Some(s);
}
@@ -279,7 +291,7 @@ impl System {
],
boundary_conditions,
grid: (grid, metrics),
output: (),
_output: (),
push,
sbp,
t: time,
@@ -294,7 +306,7 @@ impl System {
// Spawn a new communicator
DistributedSystem {
ntime,
_ntime: ntime,
start: b,
sys: tids,
}
@@ -335,13 +347,13 @@ pub struct DistributedSystem {
/// collect, initialise, return something to main)
/// This simply waits until all threads are ready, then starts the computation on all threads
start: Arc<Barrier>,
ntime: usize,
_ntime: u64,
/// These should be joined to mark the end of the computation
sys: Vec<std::thread::JoinHandle<()>>,
}
impl DistributedSystem {
fn run(self) {
pub fn run(self) {
// This should start as we have n thread, but barrier blocks on n+1
self.start.wait();
self.sys.into_iter().for_each(|tid| tid.join().unwrap());
@@ -383,16 +395,17 @@ struct DistributedSystemPart {
k: [Diff; 4],
wb: WorkBuffers,
barrier: Arc<Barrier>,
output: (), // hdf5::Dataset eventually,
_output: (), // hdf5::Dataset eventually,
t: Float,
dt: Float,
ntime: usize,
ntime: u64,
}
impl DistributedSystemPart {
fn advance(&mut self) {
self.barrier.wait();
for i in 0..self.ntime {
for _i in 0..self.ntime {
println!("step: {}", _i);
let metrics = &self.grid.1;
let wb = &mut self.wb.0;
let sbp = &self.sbp;
@@ -400,7 +413,7 @@ impl DistributedSystemPart {
let boundary_conditions = &self.boundary_conditions;
let grid = &self.grid.0;
let mut rhs = |k: &mut euler::Diff, y: &euler::Field, time: Float| {
let rhs = |k: &mut euler::Diff, y: &euler::Field, time: Float| {
// Send off the boundaries optimistically, in case some grid is ready
if let Some(s) = &push.north {
s.send(y.north().to_owned()).unwrap()
@@ -419,10 +432,6 @@ impl DistributedSystemPart {
// This computation does not depend on the boundaries
euler::RHS_no_SAT(sbp.deref(), k, y, metrics, wb);
fn north_sat() {
todo!()
}
// Get boundaries, but be careful and maximise the amount of work which can be
// performed before we have all of them, whilst ensuring threads can sleep for as
// long as possible
@@ -430,9 +439,14 @@ impl DistributedSystemPart {
let mut selectable = 0;
let recv_north = match boundary_conditions.north() {
DistributedBoundaryConditions::Channel(r)
| DistributedBoundaryConditions::Interpolate(r, _) => Some(r),
| DistributedBoundaryConditions::Interpolate(r, _) => {
selectable += 1;
Some(select.recv(r))
}
DistributedBoundaryConditions::This => {
todo!()
let data = y.south();
euler::SAT_north(sbp.deref(), k, y, metrics, data.view());
None
}
DistributedBoundaryConditions::Vortex(vp) => {
let mut data = y.north().to_owned();
@@ -443,37 +457,149 @@ impl DistributedSystemPart {
fiter.next().unwrap(),
fiter.next().unwrap(),
);
let (x, y) = grid.north();
vp.evaluate(time, x, y, rho, rhou, rhov, e);
let (gx, gy) = grid.north();
vp.evaluate(time, gx, gy, rho, rhou, rhov, e);
north_sat();
euler::SAT_north(sbp.deref(), k, y, metrics, data.view());
None
}
DistributedBoundaryConditions::Eval(eval) => {
todo!()
let mut data = y.north().to_owned();
let mut fiter = data.outer_iter_mut();
let (rho, rhou, rhov, e) = (
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
);
let (gx, gy) = grid.north();
eval.evaluate(time, gx, gy, rho, rhou, rhov, e);
euler::SAT_north(sbp.deref(), k, y, metrics, data.view());
None
}
_ => None,
};
let recv_south = if let Some(r) = boundary_conditions.south().channel() {
selectable += 1;
Some(select.recv(r))
} else {
// Do SAT boundary from other BC
None
let recv_south = match boundary_conditions.south() {
DistributedBoundaryConditions::Channel(r)
| DistributedBoundaryConditions::Interpolate(r, _) => {
selectable += 1;
Some(select.recv(r))
}
DistributedBoundaryConditions::This => {
let data = y.north();
euler::SAT_south(sbp.deref(), k, y, metrics, data.view());
None
}
DistributedBoundaryConditions::Vortex(vp) => {
let mut data = y.south().to_owned();
let mut fiter = data.outer_iter_mut();
let (rho, rhou, rhov, e) = (
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
);
let (gx, gy) = grid.south();
vp.evaluate(time, gx, gy, rho, rhou, rhov, e);
euler::SAT_south(sbp.deref(), k, y, metrics, data.view());
None
}
DistributedBoundaryConditions::Eval(eval) => {
let mut data = y.south().to_owned();
let mut fiter = data.outer_iter_mut();
let (rho, rhou, rhov, e) = (
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
);
let (gx, gy) = grid.south();
eval.evaluate(time, gx, gy, rho, rhou, rhov, e);
euler::SAT_south(sbp.deref(), k, y, metrics, data.view());
None
}
};
let recv_west = if let Some(r) = boundary_conditions.west().channel() {
selectable += 1;
Some(select.recv(r))
} else {
// Do SAT boundary from other BC
None
let recv_east = match boundary_conditions.east() {
DistributedBoundaryConditions::Channel(r)
| DistributedBoundaryConditions::Interpolate(r, _) => {
selectable += 1;
Some(select.recv(r))
}
DistributedBoundaryConditions::This => {
let data = y.west();
euler::SAT_east(sbp.deref(), k, y, metrics, data.view());
None
}
DistributedBoundaryConditions::Vortex(vp) => {
let mut data = y.east().to_owned();
let mut fiter = data.outer_iter_mut();
let (rho, rhou, rhov, e) = (
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
);
let (gx, gy) = grid.east();
vp.evaluate(time, gx, gy, rho, rhou, rhov, e);
euler::SAT_east(sbp.deref(), k, y, metrics, data.view());
None
}
DistributedBoundaryConditions::Eval(eval) => {
let mut data = y.east().to_owned();
let mut fiter = data.outer_iter_mut();
let (rho, rhou, rhov, e) = (
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
);
let (gx, gy) = grid.east();
eval.evaluate(time, gx, gy, rho, rhou, rhov, e);
euler::SAT_east(sbp.deref(), k, y, metrics, data.view());
None
}
};
let recv_east = if let Some(r) = boundary_conditions.east().channel() {
selectable += 1;
Some(select.recv(r))
} else {
// Do SAT boundary from other BC
None
let recv_west = match boundary_conditions.west() {
DistributedBoundaryConditions::Channel(r)
| DistributedBoundaryConditions::Interpolate(r, _) => {
selectable += 1;
Some(select.recv(r))
}
DistributedBoundaryConditions::This => {
let data = y.east();
euler::SAT_west(sbp.deref(), k, y, metrics, data.view());
None
}
DistributedBoundaryConditions::Vortex(vp) => {
let mut data = y.west().to_owned();
let mut fiter = data.outer_iter_mut();
let (rho, rhou, rhov, e) = (
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
);
let (gx, gy) = grid.west();
vp.evaluate(time, gx, gy, rho, rhou, rhov, e);
euler::SAT_west(sbp.deref(), k, y, metrics, data.view());
None
}
DistributedBoundaryConditions::Eval(eval) => {
let mut data = y.west().to_owned();
let mut fiter = data.outer_iter_mut();
let (rho, rhou, rhov, e) = (
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
fiter.next().unwrap(),
);
let (gx, gy) = grid.west();
eval.evaluate(time, gx, gy, rho, rhou, rhov, e);
euler::SAT_west(sbp.deref(), k, y, metrics, data.view());
None
}
};
// Get an item off each channel, waiting minimally before processing that boundary.
@@ -484,21 +610,29 @@ impl DistributedSystemPart {
let s = select.select();
let sindex = s.index();
match Some(sindex) {
recv_north => {
let r = s.recv(boundary_conditions.north().channel().unwrap());
// process into boundary SAT here
x if x == recv_north => {
let r = s
.recv(boundary_conditions.north().channel().unwrap())
.unwrap();
euler::SAT_north(sbp.deref(), k, y, metrics, r.view());
}
recv_south => {
let r = s.recv(boundary_conditions.south().channel().unwrap());
// process into boundary SAT here
x if x == recv_south => {
let r = s
.recv(boundary_conditions.south().channel().unwrap())
.unwrap();
euler::SAT_south(sbp.deref(), k, y, metrics, r.view());
}
recv_west => {
let r = s.recv(boundary_conditions.west().channel().unwrap());
// process into boundary SAT here
x if x == recv_west => {
let r = s
.recv(boundary_conditions.west().channel().unwrap())
.unwrap();
euler::SAT_west(sbp.deref(), k, y, metrics, r.view());
}
recv_east => {
let r = s.recv(boundary_conditions.east().channel().unwrap());
// process into boundary SAT here
x if x == recv_east => {
let r = s
.recv(boundary_conditions.east().channel().unwrap())
.unwrap();
euler::SAT_east(sbp.deref(), k, y, metrics, r.view());
}
_ => unreachable!(),
}