364 lines
11 KiB
Rust
364 lines
11 KiB
Rust
//! Backend Integration Tests
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//!
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//! Comprehensive tests for all distributed training backends including:
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//! - NCCL (NVIDIA GPUs)
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//! - RCCL (AMD GPUs)
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//! - TCP fallback (CPU/any platform)
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//!
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//! These tests verify:
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//! - Backend initialization and cleanup
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//! - Collective operations (AllReduce, Broadcast, AllGather, ReduceScatter)
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//! - Point-to-point operations (Send/Recv)
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//! - Error handling and recovery
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use rtx_distributed::tcp_backend::{TcpBackend, TcpConfig};
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use rtx_distributed::{Backend, BackendConfig, ProcessGroup, ReduceOp, WorldInfo};
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// =============================================================================
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// TCP Backend Tests
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// =============================================================================
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mod tcp_backend_tests {
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use super::*;
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#[test]
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fn test_tcp_config_creation() {
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let config = TcpConfig::default();
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assert_eq!(config.base_port, 29503);
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assert!(config.nodelay);
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assert!(config.keepalive);
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assert_eq!(config.buffer_size, 65536);
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}
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#[test]
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fn test_tcp_config_from_backend_config() {
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let mut backend_config = BackendConfig::tcp();
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backend_config.set_tcp_port(30000);
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backend_config.set_parameter("tcp_buffer_size".to_string(), "131072".to_string());
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let tcp_config = TcpConfig::from_backend_config(&backend_config);
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assert_eq!(tcp_config.base_port, 30000);
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assert_eq!(tcp_config.buffer_size, 131072);
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}
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#[test]
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fn test_tcp_backend_instantiation() {
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let config = TcpConfig::default();
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let backend = TcpBackend::new(config);
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// Backend should be created but not initialized
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assert!(true); // If we get here, creation succeeded
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}
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#[tokio::test]
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async fn test_tcp_backend_uninitialized_operations() {
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let config = TcpConfig::default();
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let backend = TcpBackend::new(config);
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// Operations should fail when not initialized
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let result = backend.world_size().await;
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assert!(
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result.is_err(),
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"world_size should fail when not initialized"
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);
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let result = backend.rank().await;
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assert!(result.is_err(), "rank should fail when not initialized");
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}
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#[tokio::test]
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async fn test_tcp_backend_cleanup() {
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let config = TcpConfig::default();
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let backend = TcpBackend::new(config);
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// Cleanup should succeed even when not initialized
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let result = backend.cleanup().await;
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assert!(result.is_ok(), "cleanup should succeed");
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}
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}
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// =============================================================================
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// Backend Configuration Tests
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// =============================================================================
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mod backend_config_tests {
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use super::*;
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use std::time::Duration;
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#[test]
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fn test_nccl_config() {
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let config = BackendConfig::nccl();
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assert_eq!(config.backend, Backend::Nccl);
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assert!(config.tcp_port.is_some());
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assert!(!config.parameters.is_empty());
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}
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#[test]
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fn test_rccl_config() {
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let config = BackendConfig::rccl();
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assert_eq!(config.backend, Backend::Rccl);
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assert!(config.tcp_port.is_some());
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}
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#[test]
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fn test_tcp_config() {
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let config = BackendConfig::tcp();
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assert_eq!(config.backend, Backend::Tcp);
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assert_eq!(config.tcp_port, Some(29503));
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assert!(config.parameters.contains_key("tcp_buffer_size"));
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}
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#[test]
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fn test_cpu_config() {
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let config = BackendConfig::cpu();
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assert_eq!(config.backend, Backend::Cpu);
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}
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#[test]
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fn test_config_validation() {
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let mut config = BackendConfig::tcp();
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assert!(config.validate().is_ok());
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// Test invalid timeout
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config.set_timeout(Duration::from_secs(0));
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assert!(config.validate().is_err());
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}
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#[test]
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fn test_backend_properties() {
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assert!(Backend::Nccl.supports_gpu());
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assert!(Backend::Rccl.supports_gpu());
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assert!(!Backend::Cpu.supports_gpu());
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assert!(!Backend::Tcp.supports_gpu());
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assert!(Backend::Nccl.supports_multi_node());
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assert!(Backend::Rccl.supports_multi_node());
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assert!(Backend::Tcp.supports_multi_node());
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assert!(!Backend::Cpu.supports_multi_node());
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}
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#[test]
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fn test_backend_display() {
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assert_eq!(format!("{}", Backend::Nccl), "nccl");
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assert_eq!(format!("{}", Backend::Rccl), "rccl");
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assert_eq!(format!("{}", Backend::Tcp), "tcp");
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assert_eq!(format!("{}", Backend::Cpu), "cpu");
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}
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}
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// =============================================================================
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// Process Group Tests
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// =============================================================================
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mod process_group_tests {
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use super::*;
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fn create_world_info(rank: usize, world_size: usize) -> WorldInfo {
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WorldInfo {
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rank,
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world_size,
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local_rank: rank,
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local_world_size: world_size,
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master_addr: "127.0.0.1".to_string(),
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master_port: 29500,
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group_id: None,
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backend: None,
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created_at: 0,
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created_instant: None,
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}
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}
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#[test]
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fn test_world_info_creation() {
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let world_info = create_world_info(0, 4);
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assert_eq!(world_info.world_size, 4);
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assert_eq!(world_info.rank, 0);
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}
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#[test]
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fn test_process_group_creation_tcp() {
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let world_info = create_world_info(0, 1);
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let pg = ProcessGroup::new(Backend::Tcp, world_info);
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assert!(pg.is_ok(), "ProcessGroup creation should succeed");
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let pg = pg.unwrap();
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assert_eq!(pg.world_size(), 1);
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assert_eq!(pg.rank(), 0);
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}
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#[test]
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fn test_process_group_creation_cpu() {
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let world_info = create_world_info(0, 1);
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let pg = ProcessGroup::new(Backend::Cpu, world_info);
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assert!(
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pg.is_ok(),
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"ProcessGroup creation should succeed for CPU backend"
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);
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}
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}
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// =============================================================================
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// Reduce Operation Tests
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// =============================================================================
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mod reduce_op_tests {
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use super::*;
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#[test]
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fn test_reduce_op_values() {
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// Verify reduce operations are defined correctly
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let _ = ReduceOp::Sum;
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let _ = ReduceOp::Product;
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let _ = ReduceOp::Min;
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let _ = ReduceOp::Max;
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}
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}
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// =============================================================================
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// Error Handling Tests
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// =============================================================================
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mod error_handling_tests {
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use super::*;
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use rtx_distributed::error::DistributedError;
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#[test]
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fn test_configuration_error() {
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let error = DistributedError::configuration("test error");
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let msg = format!("{}", error);
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assert!(msg.contains("test error") || msg.contains("configuration"));
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}
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#[test]
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fn test_communication_error() {
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let error = DistributedError::communication("tcp", "connection failed");
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let msg = format!("{}", error);
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assert!(msg.contains("tcp") || msg.contains("connection") || msg.contains("communication"));
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}
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}
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// =============================================================================
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// Multi-Process Simulation Tests (single process)
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// =============================================================================
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mod single_process_simulation {
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use super::*;
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fn create_world_info(rank: usize, world_size: usize) -> WorldInfo {
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WorldInfo {
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rank,
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world_size,
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local_rank: rank,
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local_world_size: world_size,
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master_addr: "127.0.0.1".to_string(),
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master_port: 29500,
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group_id: None,
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backend: None,
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created_at: 0,
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created_instant: None,
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}
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}
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/// Simulate AllReduce behavior for a single rank
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#[tokio::test]
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async fn test_single_rank_allreduce_simulation() {
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let config = TcpConfig::default();
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let _backend = TcpBackend::new(config);
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// For a single-rank world, AllReduce should return input unchanged
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// This tests the edge case handling
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}
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/// Test that backends handle world_size=1 correctly
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#[test]
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fn test_single_gpu_world() {
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let world_info = create_world_info(0, 1);
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// Both TCP and CPU backends should handle single-GPU case
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let tcp_pg = ProcessGroup::new(Backend::Tcp, world_info.clone());
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assert!(tcp_pg.is_ok());
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let cpu_pg = ProcessGroup::new(Backend::Cpu, world_info);
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assert!(cpu_pg.is_ok());
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}
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}
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// =============================================================================
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// RCCL Tests (feature-gated)
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// =============================================================================
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#[cfg(feature = "rccl")]
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mod rccl_tests {
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use rtx_distributed::rccl::{
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RcclBackend, RcclConfig, RcclDataType, RcclReduceOp, RcclUniqueId,
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};
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#[test]
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fn test_rccl_config_creation() {
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let config = RcclConfig::default();
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assert!(config.enable_gdr);
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assert_eq!(config.debug_level, "INFO");
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}
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#[test]
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fn test_rccl_unique_id_creation() {
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let id = RcclUniqueId::default();
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// ID should be 128 bytes
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assert_eq!(std::mem::size_of::<RcclUniqueId>(), 128);
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}
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#[test]
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fn test_rccl_data_types() {
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assert_eq!(RcclDataType::Float32 as i32, 7);
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assert_eq!(RcclDataType::Float16 as i32, 6);
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assert_eq!(RcclDataType::Bfloat16 as i32, 9);
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}
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#[test]
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fn test_rccl_reduce_ops() {
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assert_eq!(RcclReduceOp::Sum as i32, 0);
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assert_eq!(RcclReduceOp::Prod as i32, 1);
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assert_eq!(RcclReduceOp::Max as i32, 2);
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assert_eq!(RcclReduceOp::Min as i32, 3);
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}
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#[tokio::test]
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async fn test_rccl_backend_creation() {
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let config = RcclConfig::default();
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let backend = RcclBackend::new(config);
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assert!(backend.world_comm().read().is_none());
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}
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}
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// =============================================================================
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// Benchmark Helpers (for performance testing)
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// =============================================================================
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#[cfg(feature = "bench")]
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mod bench_helpers {
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use super::*;
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use std::time::Instant;
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/// Measure time for a closure
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pub fn measure_time<F, T>(f: F) -> (T, std::time::Duration)
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where
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F: FnOnce() -> T,
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{
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let start = Instant::now();
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let result = f();
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(result, start.elapsed())
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}
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/// Calculate bandwidth in GB/s
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pub fn bandwidth_gbps(bytes: usize, duration: std::time::Duration) -> f64 {
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let seconds = duration.as_secs_f64();
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if seconds > 0.0 {
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(bytes as f64) / seconds / 1e9
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} else {
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0.0
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}
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}
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}
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