No protocol specified | Open MPI not enough slots available in the system

Hi,

I am trying to run the distributed code for classification using the below bash command:

LOG_FILE="experiments/distributed/transformer_exps/fedavg_transformer_tc.log"
CLIENT_NUM=100
WORKER_NUM=10
SERVER_NUM=1
GPU_NUM_PER_SERVER=4
ROUND=250
CI=0

PROCESS_NUM=`expr $WORKER_NUM + 1`
echo $PROCESS_NUM
HOST_FILE=experiments/distributed/transformer_exps/mpi_host_file
hostname > $HOST_FILE

mpirun -np $PROCESS_NUM -hostfile $HOST_FILE \
python -m experiments.distributed.transformer_exps.main_text_classification \
    --gpu_mapping_file "experiments/distributed/transformer_exps/gpu_mapping.yaml" \
    --gpu_mapping_key mapping_ink-ron \
    --client_num_in_total $CLIENT_NUM \
    --client_num_per_round $WORKER_NUM \
    --comm_round $ROUND \
    --ci $CI \
    --dataset 20news \
    --data_file "data/data_files/20news_data.h5" \
    --partition_file "data/partition_files/20news_partition.h5" \
    --partition_method uniform \
    --model_type distilbert \
    --model_name distilbert-base-uncased \
    --do_lower_case True \
    --train_batch_size 8 \
    --eval_batch_size 8 \
    --max_seq_length 128 \
    --learning_rate 1e-5 \
    --server_lr 1e-5 \
    --server_optimizer adam \
    --epochs 1 \
    --output_dir "/tmp/20news_fedavg/" \
    --fed_alg fedavg \
    --fp16 
    # 2> ${LOG_FILE} &

but I always get the error message presented below:

11
No protocol specified
--------------------------------------------------------------------------
There are not enough slots available in the system to satisfy the 11
slots that were requested by the application:

  python

Either request fewer slots for your application, or make more slots
available for use.

A "slot" is the Open MPI term for an allocatable unit where we can
launch a process.  The number of slots available are defined by the
environment in which Open MPI processes are run:

  1. Hostfile, via "slots=N" clauses (N defaults to number of
     processor cores if not provided)
  2. The --host command line parameter, via a ":N" suffix on the
     hostname (N defaults to 1 if not provided)
  3. Resource manager (e.g., SLURM, PBS/Torque, LSF, etc.)
  4. If none of a hostfile, the --host command line parameter, or an
     RM is present, Open MPI defaults to the number of processor cores

In all the above cases, if you want Open MPI to default to the number
of hardware threads instead of the number of processor cores, use the
--use-hwthread-cpus option.

Alternatively, you can use the --oversubscribe option to ignore the
number of available slots when deciding the number of processes to
launch.
--------------------------------------------------------------------------

Please, can you give me some hints on how to solve this issue?

Thank you

FedML-AI / FedNLP

No protocol specified | Open MPI not enough slots available in the system #33