reuse events (#861)

* reuse events

* assign context

* dbg

* init events once

* trigger image build

* deploy test image to stage

---------

Co-authored-by: Ertugrul Aypek <ertugrul.aypek@toolsforhumanity.com>

.github/workflows/temp-branch-build-and-push.yaml

@@ -3,7 +3,7 @@ name: Branch - Build and push docker image
 on:
   push:
     branches:
-      - "ps/host-mem-alloc"
+      - "ps/reuse-events"
 
 concurrency:
   group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'

deploy/stage/common-values-iris-mpc.yaml

@@ -1,4 +1,4 @@
-image: "ghcr.io/worldcoin/iris-mpc:6b358589c25ef528f58ba02980103670b037a614"
+image: "ghcr.io/worldcoin/iris-mpc:v0.13.6"
 
 environment: stage
 replicaCount: 1

iris-mpc-gpu/src/helpers/device_manager.rs

@@ -103,8 +103,9 @@ impl DeviceManager {
     }
 
     pub fn destroy_events(&self, events: Vec<CUevent>) {
-        for event in events {
-            unsafe { event::destroy(event).unwrap() };
+        for (device_idx, event) in events.iter().enumerate() {
+            self.device(device_idx).bind_to_thread().unwrap();
+            unsafe { event::destroy(*event).unwrap() };
         }
     }
 

iris-mpc-gpu/src/server/actor.rs

@@ -107,6 +107,9 @@ pub struct ServerActor {
     disable_persistence:    bool,
     code_chunk_buffers:     Vec<DBChunkBuffers>,
     mask_chunk_buffers:     Vec<DBChunkBuffers>,
+    dot_events:             Vec<Vec<CUevent>>,
+    exchange_events:        Vec<Vec<CUevent>>,
+    phase2_events:          Vec<Vec<CUevent>>,
 }
 
 const NON_MATCH_ID: u32 = u32::MAX;
@@ -330,6 +333,11 @@ impl ServerActor {
         let code_chunk_buffers = vec![codes_engine.alloc_db_chunk_buffer(DB_CHUNK_SIZE); 2];
         let mask_chunk_buffers = vec![masks_engine.alloc_db_chunk_buffer(DB_CHUNK_SIZE); 2];
 
+        // Create all needed events
+        let dot_events = vec![device_manager.create_events(); 2];
+        let exchange_events = vec![device_manager.create_events(); 2];
+        let phase2_events = vec![device_manager.create_events(); 2];
+
         for dev in device_manager.devices() {
             dev.synchronize().unwrap();
         }
@@ -367,6 +375,9 @@ impl ServerActor {
             disable_persistence,
             code_chunk_buffers,
             mask_chunk_buffers,
+            dot_events,
+            exchange_events,
+            phase2_events,
         })
     }
 
@@ -1126,14 +1137,6 @@ impl ServerActor {
         tracing::info!(party_id = self.party_id, "Finished batch deduplication");
         // ---- END BATCH DEDUP ----
 
-        // Create new initial events
-        let mut current_dot_event = self.device_manager.create_events();
-        let mut next_dot_event = self.device_manager.create_events();
-        let mut current_exchange_event = self.device_manager.create_events();
-        let mut next_exchange_event = self.device_manager.create_events();
-        let mut current_phase2_event = self.device_manager.create_events();
-        let mut next_phase2_event = self.device_manager.create_events();
-
         let chunk_sizes = |chunk_idx: usize| {
             self.current_db_sizes
                 .iter()
@@ -1195,11 +1198,11 @@ impl ServerActor {
             // First stream doesn't need to wait
             if db_chunk_idx == 0 {
                 self.device_manager
-                    .record_event(request_streams, &current_dot_event);
+                    .record_event(request_streams, &self.dot_events[db_chunk_idx % 2]);
                 self.device_manager
-                    .record_event(request_streams, &current_exchange_event);
+                    .record_event(request_streams, &self.exchange_events[db_chunk_idx % 2]);
                 self.device_manager
-                    .record_event(request_streams, &current_phase2_event);
+                    .record_event(request_streams, &self.phase2_events[db_chunk_idx % 2]);
             }
 
             // Prefetch next chunk
@@ -1229,7 +1232,7 @@ impl ServerActor {
             );
 
             self.device_manager
-                .await_event(request_streams, &current_dot_event);
+                .await_event(request_streams, &self.dot_events[db_chunk_idx % 2]);
 
             // ---- START PHASE 1 ----
             record_stream_time!(&self.device_manager, batch_streams, events, "db_dot", {
@@ -1247,7 +1250,7 @@ impl ServerActor {
 
             // wait for the exchange result buffers to be ready
             self.device_manager
-                .await_event(request_streams, &current_exchange_event);
+                .await_event(request_streams, &self.exchange_events[db_chunk_idx % 2]);
 
             record_stream_time!(
                 &self.device_manager,
@@ -1268,7 +1271,7 @@ impl ServerActor {
             );
 
             self.device_manager
-                .record_event(request_streams, &next_dot_event);
+                .record_event(request_streams, &self.dot_events[(db_chunk_idx + 1) % 2]);
 
             record_stream_time!(
                 &self.device_manager,
@@ -1286,7 +1289,7 @@ impl ServerActor {
             // ---- END PHASE 1 ----
 
             self.device_manager
-                .await_event(request_streams, &current_phase2_event);
+                .await_event(request_streams, &self.phase2_events[db_chunk_idx % 2]);
 
             // ---- START PHASE 2 ----
             let max_chunk_size = dot_chunk_size.iter().max().copied().unwrap();
@@ -1318,8 +1321,10 @@ impl ServerActor {
                 // we can now record the exchange event since the phase 2 is no longer using the
                 // code_dots/mask_dots which are just reinterpretations of the exchange result
                 // buffers
-                self.device_manager
-                    .record_event(request_streams, &next_exchange_event);
+                self.device_manager.record_event(
+                    request_streams,
+                    &self.exchange_events[(db_chunk_idx + 1) % 2],
+                );
 
                 let res = self.phase2.take_result_buffer();
                 record_stream_time!(&self.device_manager, request_streams, events, "db_open", {
@@ -1340,23 +1345,10 @@ impl ServerActor {
                 });
             }
             self.device_manager
-                .record_event(request_streams, &next_phase2_event);
+                .record_event(request_streams, &self.phase2_events[(db_chunk_idx + 1) % 2]);
 
             // ---- END PHASE 2 ----
 
-            // Destroy events
-            self.device_manager.destroy_events(current_dot_event);
-            self.device_manager.destroy_events(current_exchange_event);
-            self.device_manager.destroy_events(current_phase2_event);
-
-            // Update events for synchronization
-            current_dot_event = next_dot_event;
-            current_exchange_event = next_exchange_event;
-            current_phase2_event = next_phase2_event;
-            next_dot_event = self.device_manager.create_events();
-            next_exchange_event = self.device_manager.create_events();
-            next_phase2_event = self.device_manager.create_events();
-
             // Increment chunk index
             db_chunk_idx += 1;