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//! Integration test for SharedWindow (RMA) operations.
//!
//! Exercises all `SharedWindow<T>` methods including allocation, local/remote
//! slice access, fence synchronization, lock/unlock (passive target) with
//! both `LockGuard` and `LockAllGuard`, flush operations, and multi-type
//! coverage (f64, i32, u64).
//!
//! Run with: mpiexec -n 4 ./target/debug/examples/test_rma_window
use ferrompi::{LockType, Mpi, SharedWindow};
fn main() {
let mpi = Mpi::init().expect("MPI init failed");
let world = mpi.world();
let rank = world.rank();
let size = world.size();
assert!(
size >= 2,
"test_rma_window requires at least 2 processes, got {size}"
);
// All SharedWindow operations require a shared-memory communicator.
let node = world.split_shared().expect("split_shared failed");
let node_rank = node.rank();
let node_size = node.size();
// ========================================================================
// Test 1: Allocate and basic properties
// ========================================================================
{
let count: usize = 10;
let mut win =
SharedWindow::<f64>::allocate(&node, count).expect("SharedWindow allocate failed");
// Verify raw_handle returns a non-negative handle
assert!(
win.raw_handle() >= 0,
"raw_handle() should be non-negative, got {}",
win.raw_handle()
);
// Verify comm_size matches the node communicator size
assert_eq!(
win.comm_size(),
node_size,
"comm_size() = {}, expected node_size = {}",
win.comm_size(),
node_size
);
// Write via local_slice_mut
{
let local = win.local_slice_mut();
assert_eq!(
local.len(),
count,
"local_slice_mut length = {}, expected {count}",
local.len()
);
for (i, x) in local.iter_mut().enumerate() {
*x = (node_rank as usize * count + i) as f64;
}
}
// Verify via local_slice (read-only)
{
let local = win.local_slice();
assert_eq!(
local.len(),
count,
"local_slice length = {}, expected {count}",
local.len()
);
for (i, &x) in local.iter().enumerate() {
let expected = (node_rank as usize * count + i) as f64;
assert!(
(x - expected).abs() < f64::EPSILON,
"rank {node_rank}: local_slice[{i}] = {x}, expected {expected}"
);
}
}
if rank == 0 {
println!("PASS: allocate and basic properties (raw_handle, comm_size, local_slice, local_slice_mut)");
}
// SharedWindow dropped here — exercises Drop
}
world.barrier().expect("barrier after test 1 failed");
// ========================================================================
// Test 2: Fence synchronization + remote_slice
// ========================================================================
{
let count: usize = 10;
let mut win =
SharedWindow::<f64>::allocate(&node, count).expect("SharedWindow allocate failed");
// Each rank writes a recognizable pattern to its local segment
{
let local = win.local_slice_mut();
for (i, x) in local.iter_mut().enumerate() {
*x = (node_rank as usize * count + i) as f64;
}
}
// Fence: ensure all writes are visible to all ranks
win.fence().expect("fence (write phase) failed");
// Read rank 0's remote data
let remote = win.remote_slice(0).expect("remote_slice(0) failed");
assert_eq!(
remote.len(),
count,
"remote_slice(0) length = {}, expected {count}",
remote.len()
);
for (i, &x) in remote.iter().enumerate() {
let expected = i as f64; // rank 0 wrote [0, 1, 2, ..., 9]
assert!(
(x - expected).abs() < f64::EPSILON,
"rank {node_rank}: remote_slice(0)[{i}] = {x}, expected {expected}"
);
}
// If multiple ranks exist, also verify a non-zero rank's data
if node_size > 1 {
let remote_1 = win.remote_slice(1).expect("remote_slice(1) failed");
for (i, &x) in remote_1.iter().enumerate() {
let expected = (count + i) as f64; // rank 1 wrote [10, 11, ..., 19]
assert!(
(x - expected).abs() < f64::EPSILON,
"rank {node_rank}: remote_slice(1)[{i}] = {x}, expected {expected}"
);
}
}
// Closing fence
win.fence().expect("fence (read phase) failed");
if rank == 0 {
println!("PASS: fence synchronization + remote_slice");
}
}
world.barrier().expect("barrier after test 2 failed");
// ========================================================================
// Test 3: Lock/unlock with LockGuard
// ========================================================================
{
let count: usize = 10;
let mut win =
SharedWindow::<f64>::allocate(&node, count).expect("SharedWindow allocate failed");
// Write local data
{
let local = win.local_slice_mut();
for (i, x) in local.iter_mut().enumerate() {
*x = (node_rank as usize * 1000 + i) as f64;
}
}
// Fence to make writes visible
win.fence().expect("fence (lock test write phase) failed");
// All ranks acquire a Shared lock on rank 0 and read
{
let guard = win
.lock(LockType::Shared, 0)
.expect("lock(Shared, 0) failed");
let remote = win.remote_slice(0).expect("remote_slice(0) in lock failed");
for (i, &x) in remote.iter().enumerate() {
let expected = i as f64; // rank 0 wrote [0, 1, ..., 9]
assert!(
(x - expected).abs() < f64::EPSILON,
"rank {node_rank}: locked remote_slice(0)[{i}] = {x}, expected {expected}"
);
}
// Flush to ensure all RMA ops complete at target
guard.flush().expect("LockGuard::flush() failed");
// LockGuard dropped here — exercises LockGuard::drop (unlock)
}
// Only rank 0 acquires an Exclusive lock on itself (safe — no contention)
if node_rank == 0 {
let guard = win
.lock(LockType::Exclusive, 0)
.expect("lock(Exclusive, 0) failed");
let remote = win
.remote_slice(0)
.expect("remote_slice(0) in exclusive lock failed");
assert!(
(remote[0]).abs() < f64::EPSILON,
"rank 0: exclusive lock remote[0] = {}, expected 0.0",
remote[0]
);
guard.flush().expect("exclusive LockGuard::flush() failed");
// LockGuard dropped — exercises exclusive unlock
}
// Final fence
win.fence().expect("fence (lock test end) failed");
if rank == 0 {
println!("PASS: lock/unlock with LockGuard (Shared + Exclusive)");
}
}
world.barrier().expect("barrier after test 3 failed");
// ========================================================================
// Test 4: lock_all / LockAllGuard
// ========================================================================
{
let count: usize = 10;
let mut win =
SharedWindow::<f64>::allocate(&node, count).expect("SharedWindow allocate failed");
// Write local data
{
let local = win.local_slice_mut();
for (i, x) in local.iter_mut().enumerate() {
*x = (node_rank as usize * count + i + 100) as f64;
}
}
// Fence to make writes visible
win.fence()
.expect("fence (lock_all test write phase) failed");
// lock_all — acquires shared locks on all ranks
{
let guard = win.lock_all().expect("lock_all() failed");
// Read rank 0's data via remote_slice
let remote = win
.remote_slice(0)
.expect("remote_slice(0) in lock_all failed");
for (i, &x) in remote.iter().enumerate() {
let expected = (i + 100) as f64; // rank 0 wrote [100, 101, ..., 109]
assert!(
(x - expected).abs() < f64::EPSILON,
"rank {node_rank}: lock_all remote_slice(0)[{i}] = {x}, expected {expected}"
);
}
// flush(0) — flush ops to rank 0
guard.flush(0).expect("LockAllGuard::flush(0) failed");
// flush_all — flush ops to all ranks
guard.flush_all().expect("LockAllGuard::flush_all() failed");
// LockAllGuard dropped here — exercises LockAllGuard::drop (unlock_all)
}
// Final fence
win.fence().expect("fence (lock_all test end) failed");
if rank == 0 {
println!("PASS: lock_all / LockAllGuard (flush, flush_all)");
}
}
world.barrier().expect("barrier after test 4 failed");
// ========================================================================
// Test 5: Multi-type coverage (i32 and u64)
// ========================================================================
{
// --- SharedWindow<i32> ---
let count: usize = 8;
let mut win_i32 =
SharedWindow::<i32>::allocate(&node, count).expect("SharedWindow<i32> allocate failed");
{
let local = win_i32.local_slice_mut();
for (i, x) in local.iter_mut().enumerate() {
*x = node_rank * 100 + i as i32;
}
}
// Verify via local_slice
{
let local = win_i32.local_slice();
for (i, &x) in local.iter().enumerate() {
let expected = node_rank * 100 + i as i32;
assert_eq!(
x, expected,
"rank {node_rank}: i32 local_slice[{i}] = {x}, expected {expected}"
);
}
}
// Fence + remote read
win_i32.fence().expect("SharedWindow<i32> fence failed");
let remote_i32 = win_i32
.remote_slice(0)
.expect("SharedWindow<i32> remote_slice(0) failed");
for (i, &x) in remote_i32.iter().enumerate() {
let expected = i as i32; // rank 0 wrote [0, 1, ..., 7]
assert_eq!(
x, expected,
"rank {node_rank}: i32 remote_slice(0)[{i}] = {x}, expected {expected}"
);
}
win_i32
.fence()
.expect("SharedWindow<i32> closing fence failed");
if rank == 0 {
println!("PASS: SharedWindow<i32> allocate, write, read");
}
// --- SharedWindow<u64> ---
let mut win_u64 =
SharedWindow::<u64>::allocate(&node, count).expect("SharedWindow<u64> allocate failed");
{
let local = win_u64.local_slice_mut();
for (i, x) in local.iter_mut().enumerate() {
*x = node_rank as u64 * 1000 + i as u64;
}
}
// Verify via local_slice
{
let local = win_u64.local_slice();
for (i, &x) in local.iter().enumerate() {
let expected = node_rank as u64 * 1000 + i as u64;
assert_eq!(
x, expected,
"rank {node_rank}: u64 local_slice[{i}] = {x}, expected {expected}"
);
}
}
// Fence + remote read
win_u64.fence().expect("SharedWindow<u64> fence failed");
let remote_u64 = win_u64
.remote_slice(0)
.expect("SharedWindow<u64> remote_slice(0) failed");
for (i, &x) in remote_u64.iter().enumerate() {
let expected = i as u64; // rank 0 wrote [0, 1, ..., 7]
assert_eq!(
x, expected,
"rank {node_rank}: u64 remote_slice(0)[{i}] = {x}, expected {expected}"
);
}
win_u64
.fence()
.expect("SharedWindow<u64> closing fence failed");
if rank == 0 {
println!("PASS: SharedWindow<u64> allocate, write, read");
}
}
// ========================================================================
// Final barrier and summary
// ========================================================================
world.barrier().expect("final barrier failed");
if rank == 0 {
println!("\n========================================");
println!("All RMA window tests passed! (5 tests)");
println!("========================================");
}
}