Optimize SV1 block notify fanout

.env.example

@@ -15,6 +15,11 @@ BITCOIN_RPC_TIMEOUT=10000
 BLOCK_TEMPLATE_LONGPOLL_TIMEOUT_MS=600000
 BLOCK_TEMPLATE_RETRY_INITIAL_MS=25
 BLOCK_TEMPLATE_RETRY_MAX_MS=1000
+# Optional comma-separated Bitcoin Core RPC endpoints. Each keeps an independent
+# GBT longpoll open, but its template is published only when the primary Core's
+# best block hash exactly authorizes the same tip. Endpoints currently share the
+# primary RPC credentials/port.
+#BITCOIN_RPC_AUX_URLS=http://bitcoin-core-2,http://bitcoin-core-3
 
 # Enable in bitcoin.conf with:
 # zmqpubrawblock=tcp://0.0.0.0:3000
@@ -43,7 +48,9 @@ SV2_AUTH_FAILURE_LOG_ENABLED=false
 STRATUM_PORTS=3333,3332,3331,3330
 # Optional PPLNS-mode SV1/SV2 autodetect ports.
 #PPLNS_STRATUM_PORTS=
-STRATUM_WORKERS=2
+# `auto` assigns available CPUs after reserving API_WORKERS plus one master CPU.
+# For fixed topology, set an explicit positive integer.
+STRATUM_WORKERS=auto
 STRATUM_WORKER_MAX_MEMORY_RESTART=4096M
 # High-byte base for pool-assigned SV2 extranonce prefixes. PM2 reserves two
 # values per NODE_APP_INSTANCE so an old/new reload pair cannot overlap. Keep
@@ -63,6 +70,16 @@ SV1_SUBSIDY_BRIDGE_ENABLED=true
 # Comma-separated: solo,pplns. PPLNS requires a fresh precomputed snapshot;
 # solo remains the safe default and is always published first when both are set.
 SV1_SUBSIDY_BRIDGE_PAYOUT_MODES=solo
+# Give the dedicated urgent Redis socket a short opportunity to acknowledge the
+# empty bridge before full-template hashing/serialization begins. On timeout the
+# master retries immediately through the independent normal command socket.
+SV1_BRIDGE_PUBLISH_BUDGET_MS=10
+# Build next-height per-miner coinbases in background batches and yield between
+# batches so normal share processing remains responsive.
+SV1_PRESTAGE_BATCH_SIZE=500
+# Operational target only: fanout logs flag workers above this client count so
+# STRATUM_WORKERS can be raised before one event loop becomes the bottleneck.
+STRATUM_FANOUT_TARGET_CLIENTS_PER_WORKER=10000
 SV1_SUBSIDY_BRIDGE_PPLNS_SEED_MAX_AGE_MS=300000
 STRATUM_JOB_RETENTION_MS=300000
 STRATUM_SUBMISSION_DEDUP_TTL_MS=300000