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chore(slurm): reduce NCCL log verbosity to WARN #40

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Merged
Neonkraft merged 1 commit into from
Jun 29, 2026
Merged

chore(slurm): reduce NCCL log verbosity to WARN #40

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2 changes: 1 addition & 1 deletion src/post_training/slurm/job_llamafactory.sh.jinja
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Expand Up @@ -43,7 +43,7 @@ export WORLD_SIZE=$(( SLURM_NNODES * GPUS_PER_NODE ))

# NCCL tuning for multi-node stability
export NCCL_IB_TIMEOUT=120
export NCCL_DEBUG=INFO
export NCCL_DEBUG=WARN
export CUDA_DEVICE_MAX_CONNECTIONS=1
export OMP_NUM_THREADS=1

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2 changes: 1 addition & 1 deletion src/post_training/slurm/job_trl_container.sh.jinja
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Expand Up @@ -43,7 +43,7 @@ export WORLD_SIZE=$(( SLURM_NNODES * GPUS_PER_NODE ))

# NCCL tuning for multi-node stability
export NCCL_IB_TIMEOUT=120
export NCCL_DEBUG=INFO
export NCCL_DEBUG=WARN
# CUDA_DEVICE_MAX_CONNECTIONS=1 is a Megatron-LM tensor-parallel flag that
# serializes CUDA streams and hurts ZeRO-2 overlap_comm — do not set it.
export OMP_NUM_THREADS=1
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