Fix the readme file regarding the steps for Hawk

.gitignore

@@ -1,12 +1,5 @@
-# Compiled source
 __pycache__
-
+notebooks/
-
+/deployment_scripts/create-env.sh
-# Packages
+/deployment_scripts/deploy-env.sh
-*.gz
+/deployment_scripts/environment.yaml
-*.rar
-*.tar
-*.zip
-
-# OS generated files
-.DS_Store

README.md

@@ -1,162 +1,127 @@
-# Ray: How to launch a Ray Cluster on Hawk?
+# Dask: How to execute python workloads using a Dask cluster on Vulcan
 
-This guide shows you how to launch a Ray cluster on HLRS' Hawk system.
+This repository looks at a deployment of a Dask cluster on Vulcan, and executing your programs using this cluster.
 
 ## Table of Contents
-- [Ray: How to launch a Ray Cluster on Hawk?](#ray-how-to-launch-a-ray-cluster-on-hawk)
+- [Getting Started](#getting-started)
-  - [Table of Contents](#table-of-contents)
+- [Usage](#usage)
-  - [Prerequisites](#prerequisites)
+- [Notes](#notes)
-  - [Getting Started](#getting-started)
-  - [Launch a local Ray Cluster in Interactive Mode](#launch-a-local-ray-cluster-in-interactive-mode)
-  - [Launch a Ray Cluster in Batch Mode](#launch-a-ray-cluster-in-batch-mode)
-
-## Prerequisites
-
-Before building the environment, make sure you have the following prerequisites:
-- [Conda Installation](https://docs.conda.io/projects/conda/en/latest/user-guide/install/index.html): Ensure that Conda is installed on your local system.
-- [Conda-Pack](https://conda.github.io/conda-pack/) installed in the base environment: Conda pack is used to package the Conda environment into a single tarball. This is used to transfer the environment to the target system.
-- `linux-64` platform for installing the Conda packages because Conda/pip downloads and installs precompiled binaries suitable to the architecture and OS of the local environment.
-
-For more information, look at the documentation for [Conda on HLRS HPC systems](https://kb.hlrs.de/platforms/index.php/How_to_move_local_conda_environments_to_the_clusters)
 
 ## Getting Started
 
-Only the main and r channels are available using the conda module on the clusters. To use custom packages, we need to move the local conda environment to Hawk. 
+### 1. Build and transfer the Conda environment to Vulcan:
 
-**Step 1.** Clone this repository to your local machine:
+Only the `main` and `r` channels are available using the Conda module on the clusters. To use custom packages, we need to move the local Conda environment to Vulcan. 
+
+Follow the instructions in [the Conda environment builder repository](https://code.hlrs.de/SiVeGCS/conda-env-builder), which includes a YAML file for building a test environment.
+
+### 2. Allocate workspace on Vulcan:
+
+Proceed to the next step if you have already configured your workspace. Use the following command to create a workspace on the high-performance filesystem, which will expire in 10 days. For more information, such as how to enable reminder emails, refer to the [workspace mechanism](https://kb.hlrs.de/platforms/index.php/Workspace_mechanism) guide.
 
 ```bash
-git clone <repository_url>
+ws_allocate dask_workspace 10
+ws_find dask_workspace # find the path to workspace, which is the destination directory in the next step
 ```
 
-**Step 2.** Go into the directory and create an environment using Conda and environment.yaml.
+### 3. Clone the repository on Vulcan to use the deployment scripts and project structure:
-
-Note: Be sure to add the necessary packages in `deployment_scripts/environment.yaml`:
-
-```bash
-cd deployment_scripts
-./create-env.sh <your-env>
-```
-
-**Step 3.** Package the environment and transfer the archive to the target system:
-
-```bash
-(base) $ conda pack -n <your-env> -o ray_env.tar.gz # conda-pack must be installed in the base environment
-```
-
-A workspace is suitable to store the compressed Conda environment archive on Hawk. Proceed to the next step if you have already configured your workspace. Use the following command to create a workspace on the high-performance filesystem, which will expire in 10 days. For more information, such as how to enable reminder emails, refer to the [workspace mechanism](https://kb.hlrs.de/platforms/index.php/Workspace_mechanism) guide.
-
-```bash
-ws_allocate hpda_project 10
-ws_find hpda_project # find the path to workspace, which is the destination directory in the next step
-```
-
-You can send your data to an existing workspace using: 
-
-```bash
-scp ray_env.tar.gz <username>@hawk.hww.hlrs.de:<workspace_directory>
-rm ray_env.tar.gz # We don't need the archive locally anymore.
-```
-
-**Step 4.** Clone the repository on Hawk to use the deployment scripts and project structure:
 
 ```bash
 cd <workspace_directory>
 git clone <repository_url>
 ```
 
-## Launch a local Ray Cluster in Interactive Mode
+### 4. Send all the code to the appropriate directory on Vulcan using `scp`:
-
-Using a single node interactively provides opportunities for faster code debugging.
-
-**Step 1.** On the Hawk login node, start an interactive job using:
 
 ```bash
-qsub -I -l select=1:node_type=rome -l walltime=01:00:00
+scp <your_script>.py <destination_host>:<destination_directory>
 ```
 
-**Step 2.** Go into the project directory:
+### 5. SSH into Vulcan and start a job interactively using:
 
 ```bash
-cd <project_directory>/deployment_scripts
+qsub -I -N DaskJob -l select=1:node_type=clx-21 -l walltime=02:00:00
 ```
+Note: For multiple nodes, it is recommended to write a `.pbs` script and submit it using `qsub`. Follow section [Multiple Nodes](#multiple-nodes) for more information.
 
-**Step 3.** Deploy the conda environment to the ram disk:
+### 6. Go into the directory with all code:
-
-Change the following line by editing `deploy-env.sh`:
 
 ```bash
-export WS_DIR=<workspace_dir>
+cd <destination_directory>
 ```
 
-Then, use the following command to deploy and activate the environment:
+### 7. Initialize the Dask cluster:
 
 ```bash
-source deploy-env.sh
+source deploy-dask.sh "$(pwd)"
 ```
-Note: Make sure all permissions are set using `chmod +x`.
+   Note: At the moment, the deployment is verbose, and there is no implementation to silence the logs.
+   Note: Make sure all permissions are set using `chmod +x` for all scripts.
 
-**Step 4.** Initialize the Ray cluster.
+## Usage
 
-You can use a Python interpreter to start a local Ray cluster:
+### Single Node
-
+To run the application interactively on a single node, follow points 4, 5, 6 and, 7 from [Getting Started](#getting-started), and execute the following command after all the job has started:
-```python
-import ray
-
-ray.init()
-```
-
-**Step 5.** Connect to the dashboard.
-
-Warning: Do not change the default dashboard host `127.0.0.1` to keep Ray cluster reachable by only you.
-
-Note: We recommend using a dedicated Firefox profile for accessing web-based services on HLRS Compute Platforms. If you haven't created a profile, check out our [guide](https://kb.hlrs.de/platforms/index.php/How_to_use_Web_Based_Services_on_HLRS_Compute_Platforms).
-
-You need the job id and the hostname for your current job. You can obtain this information on the login node using:
 
 ```bash
-qstat -anw # get the job id and the hostname
+# Load the Conda module
+module load bigdata/conda
+source activate # activates the base environment
+
+# List available Conda environments for verification purposes
+conda env list
+
+# Activate a specific Conda environment.
+conda activate dask_environment # you need to execute `source activate` first, or use `source [ENV_PATH]/bin/activate`
 ```
 
-Then, on your local computer, 
+After the environment is activated, you can run the python interpretor:
 
 ```bash
-export PBS_JOBID=<job-id> # e.g., 2316419.hawk-pbs5
+python
-ssh <compute-host> # e.g., r38c3t8n3
 ```
 
-Check your SSH config in the first step if this doesn't work.
+Or to run a full script:
-
-Then, launch Firefox web browser using the configured profile. Open `localhost:8265` to access the Ray dashboard.
-
-## Launch a Ray Cluster in Batch Mode
-
-Let us [estimate the value of π](https://docs.ray.io/en/releases-2.8.0/ray-core/examples/monte_carlo_pi.html) as an example application. 
-
-**Step 1.** Add execution permissions to `start-ray-worker.sh`
-
 ```bash
-cd deployment_scripts
+python <your-script>.py
-chmod +x start-ray-worker.sh
 ```
 
-**Step 2.** Submit a job to launch the head and worker nodes.
+### Multiple Nodes
-
+To run the application on multiple nodes, you need to write a `.pbs` script and submit it using `qsub`. Follow lines 1-4 from the [Getting Started](#getting-started) section. Write a `submit-dask-job.pbs` script:
-You must modify the following lines in `submit-ray-job.sh`:
-- Line 3 changes the cluster size. The default configuration launches a 3 node cluster.
-- `export WS_DIR=<workspace_dir>` - set the correct workspace directory.
-- `export PROJECT_DIR=$WS_DIR/<project_name>` - set the correct project directory.
-
-Note: The job script `src/monte-carlo-pi.py` waits for all nodes in the Ray cluster to become available. Preserve this pattern in your Python code while using a multiple node Ray cluster.
-
-Launch the job and monitor the progress. As the job starts, its status (S) shifts from Q (Queued) to R (Running). Upon completion, the job will no longer appear in the `qstat -a` display.
 
 ```bash
-qsub submit-ray-job.pbs
+#!/bin/bash
+#PBS -N dask-job
+#PBS -l select=3:node_type=rome
+#PBS -l walltime=1:00:00
+
+#Go to the directory where the code is
+cd <destination_directory>
+
+#Deploy the Dask cluster
+source deploy-dask.sh "$(pwd)"
+
+#Run the python script
+python <your-script>.py
+```
+
+A more thorough example is available in the `deployment_scripts` directory under `submit-dask-job.pbs`.
+
+And then execute the following commands to submit the job:
+
+```bash
+qsub submit-dask-job.pbs
 qstat -anw # Q: Queued, R: Running, E: Ending
 ls -l # list files after the job finishes
-cat ray-job.o... # inspect the output file
+cat dask-job.o... # inspect the output file
-cat ray-job.e... # inspect the error file
+cat dask-job.e... # inspect the error file
 ```
 
-If you need to delete the job, use `qdel <job-id>`. If this doesn't work, use the `-W force` option: `qdel -W force <job-id>`
+## Notes
+
+Note: Dask Cluster is set to verbose, add the following to your code while connecting to the Dask cluster:
+```python
+client = Client(..., silence_logs='error')
+```
+
+Note: Replace all filenames within `<>` with the actual values applicable to your project.

deployment_scripts/create-env.sh

@@ -1,23 +0,0 @@
-#!/bin/bash
-
-# Display usage
-if [ "$#" -ne 1 ]; then
-    echo "Usage: $0 <conda_environment_name>"
-    exit 1
-fi
-
-# Name of the Conda environment
-CONDA_ENV_NAME=$1
-
-# Check if the Conda environment already exists
-if conda env list | grep -q "$CONDA_ENV_NAME"; then
-
-  echo "Environment '$CONDA_ENV_NAME' already exists."
-
-else
-
-  echo "Environment '$CONDA_ENV_NAME' does not exist, creating it."
-
-  # Create Conda environment
-  CONDA_SUBDIR=linux-64 conda env create --name $CONDA_ENV_NAME -f environment.yaml
-fi

deployment_scripts/dask-worker.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+#Get the current workspace directory and the master node
+export CURRENT_WORKSPACE=$1
+export DASK_SCHEDULER_HOST=$2
+
+# Path to localscratch
+echo "[$(date '+%Y-%m-%d %H:%M:%S') - Worker $HOSTNAME] INFO: Setting up Dask environment"
+export DASK_ENV="$HOME/dask"
+mkdir -p $DASK_ENV
+
+# Extract Dask environment in localscratch
+echo "[$(date '+%Y-%m-%d %H:%M:%S') - Worker $HOSTNAME] INFO: Extracting Dask environment to $DASK_ENV"
+#tar -xzf $CURRENT_WORKSPACE/dask-env.tar.gz -C $DASK_ENV
+#chmod -R 700 $DASK_ENV
+
+# Start the dask environment
+echo "[$(date '+%Y-%m-%d %H:%M:%S') - Worker $HOSTNAME] INFO: Setting up Dask environment"
+source $DASK_ENV/bin/activate
+conda-unpack
+
+# Start Dask worker
+export DASK_SCHEDULER_PORT="8786" # Replace with the port on which the Dask scheduler is running
+
+# Additional Dask worker options can be added here if needed
+# Change local directory if memory is an issue
+
+# Change directory to localscratch and start Dask worker
+cd $DASK_ENV
+echo "[$(date '+%Y-%m-%d %H:%M:%S') - Worker $HOSTNAME] INFO: Starting Dask worker at $DASK_SCHEDULER_HOST on port $DASK_SCHEDULER_PORT"
+dask worker $DASK_SCHEDULER_HOST:$DASK_SCHEDULER_PORT

deployment_scripts/deploy-dask.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+export CURRENT_WORKSPACE=$1
+
+# Check if running in a PBS Job environment
+if [ -z ${PBS_NODEFILE+x} ]; then 
+    echo "[$(date '+%Y-%m-%d %H:%M:%S') - Master] ERROR: This script is meant to run as a part of PBS Job. Don't start it at login nodes."
+    exit 1
+fi
+
+export NUM_NODES=$(wc -l < $PBS_NODEFILE)
+
+if [ $NUM_NODES -lt 2 ]; then
+    echo "[$(date '+%Y-%m-%d %H:%M:%S') - Master] WARNING: You have a single node job running. Dask cluster requires at least 2 nodes."
+    exit 1
+fi
+
+export ALL_NODES=$(cat $PBS_NODEFILE)
+export SCHEDULER_NODE="$(head -n1 $PBS_NODEFILE)-ib"
+export WORKER_NODES=$(tail -n+2 $PBS_NODEFILE)
+
+export DASK_SCHEDULER_PORT=8786
+export DASK_UI_PORT=8787
+
+echo "[$(date '+%Y-%m-%d %H:%M:%S') - Master] INFO: Starting Dask cluster with $NUM_NODES nodes."
+# Path to localscratch
+export DASK_ENV="$HOME/dask"
+mkdir -p $DASK_ENV
+
+echo "[$(date '+%Y-%m-%d %H:%M:%S') - Master] INFO: Extracting Dask environment to $DASK_ENV"
+# Extract Dask environment in localscratch
+tar -xzf $CURRENT_WORKSPACE/dask-env.tar.gz -C $DASK_ENV
+chmod -R 700 $DASK_ENV
+
+echo "[$(date '+%Y-%m-%d %H:%M:%S') - Master] INFO: Setting up Dask environment"
+# Start the dask environment
+source $DASK_ENV/bin/activate
+conda-unpack
+
+echo "[$(date '+%Y-%m-%d %H:%M:%S') - Master] INFO: Starting Dask Scheduler at $SCHEDULER_NODE on port $DASK_SCHEDULER_PORT"
+dask scheduler --host $SCHEDULER_NODE --port $DASK_SCHEDULER_PORT &
+
+export NUM_NODES=$(sort $PBS_NODEFILE |uniq | wc -l)
+
+# Assuming you have a Dask worker script named 'dask-worker-script.py', modify this accordingly
+for ((i=1;i<$NUM_NODES;i++)); do
+    echo "[$(date '+%Y-%m-%d %H:%M:%S') - Master] INFO: Starting Dask Worker at $i"
+	pbsdsh -n $i -o -- bash -l -c "source $CURRENT_WORKSPACE/dask-worker.sh $CURRENT_WORKSPACE $SCHEDULER_NODE"
+done
+
+echo "[$(date '+%Y-%m-%d %H:%M:%S') - Master] INFO: Dask cluster ready, wait for workers to connect to the scheduler."
+
+# Optionally, you can provide a script for the workers to execute using ssh, similar to Spark.
+# Example: ssh $node "source activate your_conda_env && python your_dask_worker_script.py" &

deployment_scripts/deploy-env.sh

@@ -1,43 +0,0 @@
-#!/bin/bash
-
-export WS_DIR=<workspace_dir>
-
-# Get the first character of the hostname
-first_char=$(hostname | cut -c1)
-
-# Check if the first character is not "r"
-if [[ $first_char != "r" ]]; then
-        # it's not a cpu node.
-    echo "Hostname does not start with 'r'."
-    # Get the first seven characters of the hostname
-    first_seven_chars=$(hostname | cut -c1,2,3,4,5,6,7)
-    # Check if it is an ai node
-    if [[ $first_seven_chars != "hawk-ai" ]]; then
-                echo "Hostname does not start with 'hawk-ai' too. Exiting."
-        return 1
-    else
-        echo "GPU node detected."
-        export OBJ_STR_MEMORY=350000000000
-        export TEMP_CHECKPOINT_DIR=/localscratch/$PBS_JOBID/model_checkpoints/
-        mkdir -p $TEMP_CHECKPOINT_DIR
-    fi
-else
-        echo "CPU node detected."
-fi
-
-module load bigdata/conda
-
-export RAY_DEDUP_LOGS=0
-
-export ENV_ARCHIVE=ray_env.tar.gz
-export CONDA_ENVS=/run/user/$PBS_JOBID/envs
-export ENV_NAME=ray_env
-export ENV_PATH=$CONDA_ENVS/$ENV_NAME
-
-mkdir -p $ENV_PATH
-
-tar -xzf $WS_DIR/$ENV_ARCHIVE -C $ENV_PATH
-
-source $ENV_PATH/bin/activate
-
-export CONDA_ENVS_PATH=CONDA_ENVS

deployment_scripts/deployment_scripts_reference.md

@@ -1,18 +1,4 @@
-# Reference: Cluster Deployment Scripts
+# Reference Guide: Dask Cluster Deployment Scripts
-
-Wiki link: 
-
-Motivation: This document aims to show users how to use additional Dask deployment scripts to streamline the deployment and management of a Dask cluster on a high-performance computing (HPC) environment.
-
-Structure:
-- [ ] [Tutorial](https://diataxis.fr/tutorials/)
-- [ ] [How-to guide](https://diataxis.fr/how-to-guides/)
-- [x] [Reference](https://diataxis.fr/reference/)
-- [ ] [Explanation](https://diataxis.fr/explanation/)
-
-To do:
-
----
 
 ## Overview
 
@@ -36,40 +22,7 @@ Before using these scripts, ensure that the following prerequisites are met:
 
 3. **SSH Setup**: Ensure that SSH is set up and configured on your system for remote server communication.
 
-## 1. create-env.sh
+## 1. deploy-dask.sh
-
-### Overview
-
-`create-env.sh` is designed to create a Conda environment. It checks for the existence of the specified environment and either creates it or notifies the user if it already exists.
-Note: Define your Conda environment in `environment.yaml` before running this script.
-
-### Usage
-
-```bash
-./create-env.sh <conda_environment_name>
-```
-
-### Note
-
-- This script is intended to run on a local system where Conda is installed.
-
-## 2. deploy-env.sh
-
-### Overview
-
-`deploy-env.sh` is responsible for deploying the Conda environment to a remote server. If the tar.gz file already exists, it is copied; otherwise, it is created before being transferred.
-
-### Usage
-
-```bash
-./deploy-env.sh <environment_name> <destination_directory>
-```
-
-### Note
-
-- This script is intended to run on a local system.
-
-## 3. deploy-dask.sh
 
 ### Overview
 
@@ -86,7 +39,7 @@ Note: Define your Conda environment in `environment.yaml` before running this sc
 - This script is designed for an HPC environment with PBS job scheduling.
 - Modifications may be necessary for different job schedulers.
 
-## 4. dask-worker.sh
+## 2. dask-worker.sh
 
 ### Overview
 
@@ -96,9 +49,3 @@ Note: Define your Conda environment in `environment.yaml` before running this sc
 
 - Execute this script on each allocated node to connect them to the Dask scheduler.
 - Designed for use with PBS job scheduling.
-
-## Workflow
-
-1. **Create Conda Environment**: Execute `create-env.sh` to create a Conda environment locally.
-2. **Deploy Conda Environment**: Execute `deploy-env.sh` to deploy the Conda environment to a remote server.
-3. **Deploy Dask Cluster**: Execute `deploy-dask.sh` to start the Dask cluster on an HPC environment.

deployment_scripts/environment.yaml

@@ -1,23 +0,0 @@
-name: ray
-channels:
-  - defaults
-dependencies:
-  - python=3.10
-  - pip
-  - pip:
-    - ray==2.8.0
-    - "ray[default]==2.8.0"
-    - dask==2022.10.1
-    - torch
-    - pydantic<2
-    - six
-    - torch
-    - tqdm
-    - pandas<2
-    - scikit-learn
-    - matplotlib
-    - optuna
-    - seaborn
-    - tabulate
-    - jupyterlab
-    - autopep8

deployment_scripts/ray.dockerfile

@@ -1,27 +0,0 @@
-FROM python:3.9
-
-# -------------------------------------------------------------------
-# Install Ray and essential packages.
-# For more information on Ray installation, see:
-#   https://docs.ray.io/en/latest/ray-overview/installation.html
-# Install the latest Dask versions that are compatible with
-#   Ray nightly. For more information, see:
-#   https://docs.ray.io/en/latest/data/dask-on-ray.html
-# -------------------------------------------------------------------
-
-RUN pip install --no-cache-dir \
-"ray==2.8.0" \
-"ray[default]==2.8.0" \
-"dask==2022.10.1" \
-torch \
-"pydantic<2" \
-six \
-"tqdm<2" \
-"pandas<2" \
-scikit-learn \
-matplotlib \
-optuna \
-seaborn \
-tabulate \
-jupyterlab \
-autopep8

deployment_scripts/start-ray-worker.sh

@@ -1,26 +0,0 @@
-#!/bin/bash
-
-if [ $# -ne 5 ]; then
-    echo "Usage: $0 <ws_dir> <env_archive> <ray_address> <redis_password> <obj_store_memory>"
-    exit 1
-fi
-
-export WS_DIR=$1
-export ENV_ARCHIVE=$2
-export RAY_ADDRESS=$3
-export REDIS_PASSWORD=$4
-export OBJECT_STORE_MEMORY=$5
-
-export ENV_PATH=/run/user/$PBS_JOBID/ray_env # We use the ram disk to extract the environment packages since a large number of files decreases the performance of the parallel file system.
-
-mkdir -p $ENV_PATH
-tar -xzf $WS_DIR/$ENV_ARCHIVE -C $ENV_PATH
-source $ENV_PATH/bin/activate
-conda-unpack
-
-ray start --address=$RAY_ADDRESS \
-        --redis-password=$REDIS_PASSWORD \
-        --object-store-memory=$OBJECT_STORE_MEMORY \
-        --block
-
-rm -rf $ENV_PATH # It's nice to clean up before you terminate the job

deployment_scripts/submit-dask-job.pbs

@@ -0,0 +1,33 @@
+#!/bin/bash
+#PBS -N dask-job
+#PBS -l select=2:node_type=rome
+#PBS -l walltime=1:00:00
+
+export PYTHON_FILE= # Path to the Python file you want to run
+export CURRENT_WORKSPACE= # Path to the workspace where you have pulled this repo and the dask-env.tar.gz file
+
+export ALL_NODES=$(cat $PBS_NODEFILE)
+export SCHEDULER_NODE="$(head -n1 $PBS_NODEFILE)-ib"
+export WORKER_NODES=$(tail -n+2 $PBS_NODEFILE)
+
+export DASK_SCHEDULER_PORT=8786
+export DASK_UI_PORT=8787
+
+export DASK_ENV="$HOME/dask"
+mkdir -p $DASK_ENV
+tar -xzf $CURRENT_WORKSPACE/dask-env.tar.gz -C $DASK_ENV
+chmod -R 700 $DASK_ENV
+
+source $DASK_ENV/bin/activate
+conda-unpack
+
+dask scheduler --host $SCHEDULER_NODE --port $DASK_SCHEDULER_PORT &
+export NUM_NODES=$(sort $PBS_NODEFILE |uniq | wc -l)
+
+# Assuming you have a Dask worker script named 'dask-worker-script.py', modify this accordingly
+for ((i=1;i<$NUM_NODES;i++)); do
+    echo "[$(date '+%Y-%m-%d %H:%M:%S') - Master] INFO: Starting Dask Worker at $i"
+	pbsdsh -n $i -o -- bash -l -c "source /deplyment_scripts/dask-worker.sh $CURRENT_WORKSPACE $SCHEDULER_NODE"
+done
+
+python3 $PYTHON_FILE

deployment_scripts/submit-ray-job.pbs

@@ -1,50 +0,0 @@
-#!/bin/bash
-#PBS -N ray-job
-#PBS -l select=2:node_type=rome
-#PBS -l walltime=1:00:00
-
-export WS_DIR=<workspace_dir>
-export PROJECT_DIR=$WS_DIR/<project_name>
-export JOB_SCRIPT=monte-carlo-pi.py
-
-export ENV_ARCHIVE=ray_env.tar.gz
-
-export OBJECT_STORE_MEMORY=128000000000
-
-# Environment variables after this line should not change
-
-export SRC_DIR=$PROJECT_DIR/src
-export PYTHON_FILE=$SRC_DIR/$JOB_SCRIPT
-export DEPLOYMENT_SCRIPTS=$PROJECT_DIR/deployment_scripts
-export ENV_PATH=/run/user/$PBS_JOBID/ray_env # We use the ram disk to extract the environment packages since a large number of files decreases the performance of the parallel file system.
-
-mkdir -p $ENV_PATH
-tar -xzf $WS_DIR/$ENV_ARCHIVE -C $ENV_PATH # This line extracts the packages to ram disk.
-source $ENV_PATH/bin/activate
-
-export IP_ADDRESS=`ip addr show ib0 | grep -oP '(?<=inet\s)\d+(\.\d+){3}' | awk '{print $1}'`
-
-export RAY_ADDRESS=$IP_ADDRESS:6379
-export REDIS_PASSWORD=$(openssl rand -base64 32)
-
-export NCCL_DEBUG=INFO
-
-ray start --disable-usage-stats \
-        --head \
-        --node-ip-address=$IP_ADDRESS \
-        --port=6379 \
-        --dashboard-host=127.0.0.1 \
-        --redis-password=$REDIS_PASSWORD \
-        --object-store-memory=$OBJECT_STORE_MEMORY
-
-export NUM_NODES=$(sort $PBS_NODEFILE |uniq | wc -l)
-
-for ((i=1;i<$NUM_NODES;i++)); do
-        pbsdsh -n $i -- bash -l -c "'$DEPLOYMENT_SCRIPTS/start-ray-worker.sh' '$WS_DIR' '$ENV_ARCHIVE' '$RAY_ADDRESS' '$REDIS_PASSWORD' '$OBJECT_STORE_MEMORY'" &
-done
-
-python3 $PYTHON_FILE
-
-ray stop --grace-period 30
-
-rm -rf $ENV_PATH # It's nice to clean up before you terminate the job.

notebooks/local_ray_cluster.ipynb

@@ -1,54 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "import ray"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "ray.init()"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "cluster_resources = ray.available_resources()\n",
-    "available_cpu_cores = cluster_resources.get('CPU', 0)\n",
-    "print(cluster_resources)"
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "ray",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.10.13"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 2
-}

reproduce_container_bug.md

@@ -1,38 +0,0 @@
-Create the container on the login node:
-
-```bash
-export WS_DIR=$(ws_find workspace_dir) # adjust this
-cd $WS_DIR
-wget https://fex.hlrs.de/fop/FYaJqyzw/ray.tar # download the container archive
-export CONTAINER_NAME=ray
-export CONTAINER_TAG=latest
-export UDOCKER_DIR="$WS_DIR/.udocker/" # to store the image layers
-udocker images -l # this will create a repo the first time you use it
-udocker rmi $CONTAINER_NAME:$CONTAINER_TAG # results in error since the image does not exist
-udocker load -i $WS_DIR/$CONTAINER_NAME.tar $CONTAINER_NAME
-rm /$WS_DIR/$CONTAINER_NAME.tar # you no longer need the tar archive
-```
-
-Allocate a CPU node, and then:
-
-```bash
-module load bigdata/udocker/1.3.4
-export WS_DIR=$(ws_find workspace_dir) # adjust this
-export UDOCKER_DIR="$WS_DIR/.udocker/"
-export UDOCKER_CONTAINERS="/run/user/$PBS_JOBID/udocker/containers"
-mkdir -p $UDOCKER_CONTAINERS
-mkdir -p /run/user/$PBS_JOBID/tmp
-export CONTAINER_NAME=ray
-export CONTAINER_TAG=latest
-udocker create --name=$CONTAINER_NAME:$CONTAINER_TAG
-udocker ps
-udocker run --volume $WS_DIR:/workspace --volume /run/user/$PBS_JOBID/tmp:/tmp $CONTAINER_NAME
-```
-
-You should see a Python shell.
-
-```python
-import ray
-# ray.init(num_cpus=4) # Works with a small number of CPUs
-ray.init() # But, it can't use all the available CPUs
-```

src/dask-example-pi.py

@@ -0,0 +1,16 @@
+import dask.bag as db
+import random
+from dask.distributed import Client
+
+client = Client(str(os.getenv('HOSTNAME')) + "-ib:8786")
+NUM_SAMPLES=100
+
+def inside(p):
+    x, y = random.random(), random.random()
+    return x*x + y*y < 1
+
+def calc_pi():
+    count = db.from_sequence(range(0, NUM_SAMPLES)).filter(inside).count().compute()
+    return 4.0 * count / NUM_SAMPLES
+
+print(calc_pi())

src/monte-carlo-pi.py

@@ -1,89 +0,0 @@
-# Adopted from: https://docs.ray.io/en/releases-2.8.0/ray-core/examples/monte_carlo_pi.html
-
-import ray
-import math
-import time
-import random
-import os
-
-# Change this to match your cluster scale.
-NUM_SAMPLING_TASKS = 100
-NUM_SAMPLES_PER_TASK = 10_000_000
-TOTAL_NUM_SAMPLES = NUM_SAMPLING_TASKS * NUM_SAMPLES_PER_TASK
-        
-@ray.remote
-class ProgressActor:
-    def __init__(self, total_num_samples: int):
-        self.total_num_samples = total_num_samples
-        self.num_samples_completed_per_task = {}
-
-    def report_progress(self, task_id: int, num_samples_completed: int) -> None:
-        self.num_samples_completed_per_task[task_id] = num_samples_completed
-
-    def get_progress(self) -> float:
-        return (
-            sum(self.num_samples_completed_per_task.values()) / self.total_num_samples
-        )
-
-@ray.remote
-def sampling_task(num_samples: int, task_id: int,
-                  progress_actor: ray.actor.ActorHandle) -> int:
-    num_inside = 0
-    for i in range(num_samples):
-        x, y = random.uniform(-1, 1), random.uniform(-1, 1)
-        if math.hypot(x, y) <= 1:
-            num_inside += 1
-
-        # Report progress every 1 million samples.
-        if (i + 1) % 1_000_000 == 0:
-            # This is async.
-            progress_actor.report_progress.remote(task_id, i + 1)
-
-    # Report the final progress.
-    progress_actor.report_progress.remote(task_id, num_samples)
-    return num_inside
-
-def wait_for_nodes(expected_num_nodes: int):
-    while True:
-        num_nodes = len(ray.nodes())
-        if num_nodes >= expected_num_nodes:
-            break
-        print(f'Currently {num_nodes} nodes connected. Waiting for more...')
-        time.sleep(5)  # wait for 5 seconds before checking again
-        
-if __name__ == "__main__":
-
-    num_nodes = int(os.environ["NUM_NODES"])
-    assert num_nodes > 1, "If the environment variable NUM_NODES is set, it should be greater than 1."
-
-    redis_password = os.environ["REDIS_PASSWORD"]
-    ray.init(address="auto", _redis_password=redis_password)
-
-    wait_for_nodes(num_nodes)
-
-    cluster_resources = ray.available_resources()
-    print(cluster_resources)
-
-    # Create the progress actor.
-    progress_actor = ProgressActor.remote(TOTAL_NUM_SAMPLES)
-
-    # Create and execute all sampling tasks in parallel.
-    results = [
-        sampling_task.remote(NUM_SAMPLES_PER_TASK, i, progress_actor)
-        for i in range(NUM_SAMPLING_TASKS)
-    ]
-
-    # Query progress periodically.
-    while True:
-        progress = ray.get(progress_actor.get_progress.remote())
-        print(f"Progress: {int(progress * 100)}%")
-
-        if progress == 1:
-            break
-
-        time.sleep(1)
-
-    # Get all the sampling tasks results.
-    total_num_inside = sum(ray.get(results))
-    pi = (total_num_inside * 4) / TOTAL_NUM_SAMPLES
-    print(f"Estimated value of π is: {pi}")