top-k

k8s-dvfs/.gitignore

@@ -0,0 +1,8 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+.idea
+.nextflow*
+
+# Ignore Gradle build output directory
+build
+work

k8s-dvfs/COPYING

@@ -0,0 +1,176 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
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+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
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+      including but not limited to software source code, documentation
+      source, and configuration files.
+
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+      transformation or translation of a Source form, including but
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+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
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+
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
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+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
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+   9. Accepting Warranty or Additional Liability. While redistributing
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+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+

k8s-dvfs/Makefile

@@ -0,0 +1,25 @@
+# Use the Gradle wrapper by default; override with e.g. `make GRADLE=gradle ...`
+# or `export GRADLE=gradle` (useful in pixi/conda environments).
+GRADLE ?= ./gradlew
+
+# Build the plugin
+assemble:
+	$(GRADLE) assemble
+
+clean:
+	rm -rf .nextflow*
+	rm -rf work
+	rm -rf build
+	$(GRADLE) clean
+
+# Run plugin unit tests
+test:
+	$(GRADLE) test
+
+# Install the plugin into local nextflow plugins dir
+install:
+	$(GRADLE) install
+
+# Publish the plugin
+release:
+	$(GRADLE) releasePlugin

k8s-dvfs/README.md

@@ -0,0 +1,86 @@
+# k8s-dvfs
+
+## Summary
+
+`k8s-dvfs` is a Nextflow plugin scaffolded from the official plugin
+template. Out of the box it provides:
+
+- A custom function `sayHello` that can be imported into Nextflow scripts.
+- A workflow observer that reacts to pipeline lifecycle events (start and
+  completion).
+
+Replace this section with a description of what your plugin actually does.
+
+Note: The **Summary**, **Get Started**, **Examples**, and **License** sections are
+mandatory: they are required by the Nextflow Registry, which uses this
+file as the plugin description. The **Plugin development** section below is
+guidance for working on the plugin and can be removed before publishing.
+
+## Get Started
+
+Enable the plugin in your pipeline `nextflow.config`:
+
+```groovy
+plugins {
+    id 'k8s-dvfs@0.1.0'
+}
+```
+
+Nextflow downloads the plugin from the Nextflow Registry the first time
+the pipeline runs.
+
+## Examples
+
+Import and call the `sayHello` function from a Nextflow script:
+
+```nextflow
+include { sayHello } from 'plugin/k8s-dvfs'
+
+workflow {
+    channel.of('Mundo', 'World').map { target -> sayHello(target) }
+}
+```
+
+The bundled observer prints a message when the pipeline starts and completes,
+so running any pipeline with the plugin enabled produces:
+
+```
+Pipeline is starting! 🚀
+Pipeline complete! 👋
+```
+
+## Plugin development
+
+This project was created from the [Nextflow plugin template](https://www.nextflow.io/docs/latest/guides/gradle-plugin.html#gradle-plugin-create).
+
+### Building
+
+To build the plugin:
+
+```bash
+make assemble
+```
+
+### Testing with Nextflow
+
+The plugin can be tested without a local Nextflow installation:
+
+1. Build and install the plugin to your local Nextflow installation: `make install`
+2. Run a pipeline with the plugin: `nextflow run hello -plugins k8s-dvfs@0.1.0`
+
+### Publishing
+
+Plugins can be published to a central Nextflow registry to make them accessible to the Nextflow community.
+
+Follow these steps to publish the plugin to the Nextflow Registry:
+
+1. Create a file named `$HOME/.gradle/gradle.properties`, where `$HOME` is your home directory. Add the following properties:
+    * `npr.apiKey`: Your Nextflow Registry access token.
+2. Package your plugin and publish it to the registry: `make release`.
+
+## License
+
+Apache License 2.0. See the [`COPYING`](COPYING) file for details.
+
+Note: The above license is given for guidance only; however the Nextflow Registry
+requires the plugin to include an OSS (open source software) license.

k8s-dvfs/build.gradle

@@ -0,0 +1,17 @@
+plugins {
+    id 'io.nextflow.nextflow-plugin' version '1.0.0-beta.15'
+}
+
+version = '0.1.0'
+
+nextflowPlugin {
+    nextflowVersion = '25.10.0'
+
+    provider = 'recreational.tech'
+    className = 'recreationaltech.plugin.K8sDvfsPlugin'
+    extensionPoints = [
+        'recreationaltech.plugin.K8sDvfsExtension',
+        'recreationaltech.plugin.K8sDvfsFactory'
+    ]
+
+}

k8s-dvfs/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

k8s-dvfs/gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

k8s-dvfs/settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'k8s-dvfs'

k8s-dvfs/src/main/groovy/recreationaltech/plugin/K8sDvfsExtension.groovy

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2025, Seqera Labs
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package recreationaltech.plugin
+
+import groovy.transform.CompileStatic
+import nextflow.Session
+import nextflow.plugin.extension.Function
+import nextflow.plugin.extension.PluginExtensionPoint
+
+/**
+ * Implements a custom function which can be imported by
+ * Nextflow scripts.
+ */
+@CompileStatic
+class K8sDvfsExtension extends PluginExtensionPoint {
+
+    @Override
+    protected void init(Session session) {
+    }
+
+    /**
+     * Say hello to the given target.
+     *
+     * @param target
+     */
+    @Function
+    void sayHello(String target) {
+        println "Hello, ${target}!"
+    }
+
+}

k8s-dvfs/src/main/groovy/recreationaltech/plugin/K8sDvfsFactory.groovy

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2025, Seqera Labs
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package recreationaltech.plugin
+
+import groovy.transform.CompileStatic
+import nextflow.Session
+import nextflow.trace.TraceObserver
+import nextflow.trace.TraceObserverFactory
+
+/**
+ * Implements a factory object required to create
+ * the {@link K8sDvfsObserver} instance.
+ */
+@CompileStatic
+class K8sDvfsFactory implements TraceObserverFactory {
+
+    @Override
+    Collection<TraceObserver> create(Session session) {
+        return List.<TraceObserver>of(new K8sDvfsObserver())
+    }
+
+}

k8s-dvfs/src/main/groovy/recreationaltech/plugin/K8sDvfsObserver.groovy

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2025, Seqera Labs
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package recreationaltech.plugin
+
+import groovy.transform.CompileStatic
+import groovy.util.logging.Slf4j
+import nextflow.Session
+import nextflow.trace.TraceObserver
+
+/**
+ * Implements an observer that allows implementing custom
+ * logic on nextflow execution events.
+ */
+@Slf4j
+@CompileStatic
+class K8sDvfsObserver implements TraceObserver {
+
+    @Override
+    void onFlowCreate(Session session) {
+        println "Pipeline is starting! 🚀"
+    }
+
+    @Override
+    void onFlowComplete() {
+        println "Pipeline complete! 👋"
+    }
+}

k8s-dvfs/src/main/groovy/recreationaltech/plugin/K8sDvfsPlugin.groovy

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2025, Seqera Labs
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package recreationaltech.plugin
+
+import groovy.transform.CompileStatic
+import nextflow.plugin.BasePlugin
+import org.pf4j.PluginWrapper
+
+/**
+ * The plugin entry point
+ */
+@CompileStatic
+class K8sDvfsPlugin extends BasePlugin {
+
+    K8sDvfsPlugin(PluginWrapper wrapper) {
+        super(wrapper)
+    }
+}

k8s-dvfs/src/test/groovy/recreationaltech/plugin/K8sDvfsObserverTest.groovy

@@ -0,0 +1,22 @@
+package recreationaltech.plugin
+
+import nextflow.Session
+import spock.lang.Specification
+
+/**
+ * Implements a basic factory test
+ *
+ */
+class K8sDvfsObserverTest extends Specification {
+
+    def 'should create the observer instance' () {
+        given:
+        def factory = new K8sDvfsFactory()
+        when:
+        def result = factory.create(Mock(Session))
+        then:
+        result.size() == 1
+        result.first() instanceof K8sDvfsObserver
+    }
+
+}

nextflow/plugins/nf-k8s/src/main/nextflow/k8s/K8sConfig.groovy

@@ -260,6 +260,18 @@ class K8sConfig implements ConfigScope {
     """)
     final Duration noiseRuntimeEstimatorNoiseMagnitude
 
+    @ConfigOption
+    @Description("""
+        Max. amount of time two runtime estimates can differ to be considered equal.
+    """)
+    final Duration runtimeComparisonEpsilon
+
+    @ConfigOption
+    @Description("""
+        Number of saved top runtimes used to classify a task as critical.
+    """)
+    final int dvfsSchedulingNumTopRuntimes
+
     /* required by extension point -- do not remove */
     K8sConfig() {
         this(Collections.emptyMap())
@@ -300,7 +312,9 @@ class K8sConfig implements ConfigScope {
 
         schedulingStrategy = opts.schedulingStrategy as String ?: "Hash"
         runtimeEstimator = opts.runtimeEstimator as String ?: "LinearFit"
-        noiseRuntimeEstimatorNoiseMagnitude = opts.noiseRuntimeEstimatorNoiseMagnitude as Duration ?: new Duration(10, TimeUnit.SECONDS)
+        noiseRuntimeEstimatorNoiseMagnitude = opts.noiseRuntimeEstimatorNoiseMagnitude as Duration ?: new Duration(30, TimeUnit.SECONDS)
+        runtimeComparisonEpsilon = opts.runtimeComparisonEpsilon as Duration ?: new Duration(10, TimeUnit.SECONDS)
+        dvfsSchedulingNumTopRuntimes = opts.dvfsSchedulingTopRuntimes as int ?: 3
 
         // -- shortcut to pod image pull-policy
         if( imagePullPolicy )

nextflow/plugins/nf-k8s/src/main/nextflow/k8s/K8sExecutor.groovy

@@ -112,7 +112,7 @@ class K8sExecutor extends Executor implements ExtensionPoint {
         K8sSchedulingStrategy strategy = null
         if (k8sConfig.schedulingStrategy == "Hash") {
             strategy = new K8sHashSchedulingStrategy()
-        } else if (k8sConfig.schedulingStrategy == "DVFS") {
+        } else if (k8sConfig.schedulingStrategy == "DVFS" || k8sConfig.schedulingStrategy == "DVFS-SPEED") {
             String[] ips = new String[nodes.length]
             for (int i = 0; i < nodes.length; i++) {
                 ips[i] = client.getPodIpAddress(K8sNodeInitDeployer.buildPodName(nodes[i]))
@@ -120,18 +120,10 @@ class K8sExecutor extends Executor implements ExtensionPoint {
             }
             strategy = new K8sDVFSSchedulingStrategy(this.runtimeEstimator,
                 new K8sDVFSClient(nodes, ips),
-                () -> getClient())
+                () -> getClient(),
-            strategy.fullSpeedMode = false
+                k8sConfig.runtimeComparisonEpsilon,
-        } else if (k8sConfig.schedulingStrategy == "DVFS-SPEED") {
+                k8sConfig.dvfsSchedulingNumTopRuntimes)
-            String[] ips = new String[nodes.length]
+            strategy.fullSpeedMode = k8sConfig.schedulingStrategy == "DVFS-SPEED"
-            for (int i = 0; i < nodes.length; i++) {
-                ips[i] = client.getPodIpAddress(K8sNodeInitDeployer.buildPodName(nodes[i]))
-                log.info "[K8s] node ${nodes[i]} -> ${ips[i]}"
-            }
-            strategy = new K8sDVFSSchedulingStrategy(this.runtimeEstimator,
-                new K8sDVFSClient(nodes, ips),
-                () -> getClient())
-            strategy.fullSpeedMode = true
         } else {
             log.error "[K8s] invalid scheduling strategy $k8sConfig.schedulingStrategy, falling back on \"Hash\""
             strategy = new K8sHashSchedulingStrategy()

nextflow/plugins/nf-k8s/src/main/nextflow/k8s/strategies/K8sDVFSSchedulingStrategy.groovy

@@ -11,7 +11,7 @@ import nextflow.k8s.K8sTaskHandler
 import nextflow.k8s.K8sTaskScheduler
 import nextflow.k8s.client.K8sClient
 import nextflow.processor.TaskRun
-import nextflow.util.ArrayTuple
+import nextflow.util.Duration
 
 /**
  * Implements a scheduling strategy utilizing dvfs to reduce the energy consumption
@@ -142,16 +142,17 @@ class K8sDVFSSchedulingStrategy implements K8sSchedulingStrategy {
     class SchedulingRequestComparator implements Comparator<K8sSchedulingRequest> {
         K8sRuntimeEstimator runtimeEstimator
         long currentTime
-        double avgRuntime
+        double epsilon
 
         @Override
         int compare(K8sSchedulingRequest o1, K8sSchedulingRequest o2) {
             // First, check if one of the tasks is (estimated to be) on the critical path
             double t1 = runtimeEstimator.estimate(o1.handler)
             double t2 = runtimeEstimator.estimate(o2.handler)
-            if (t1 > avgRuntime && t2 <= avgRuntime)
+
+            if (t1 > t2 + epsilon)
                 return -1
-            else if (t1 < avgRuntime && t2 > avgRuntime)
+            else if (t2 > t1 + epsilon)
                 return 1
 
             // Both are not on the critical path. Sort based on the time they spent in the queue
@@ -170,23 +171,57 @@ class K8sDVFSSchedulingStrategy implements K8sSchedulingStrategy {
 
     private ArrayList<WorkerNode> nodes
     private HashMap<String, WorkerNode> taskToNode
-
-    private double averageRuntime
-    private long finishedTaskCount
-
     private long globalMaxFrequency
     private long globalMinFrequency
 
     private K8sClientGetter clientGetter
 
+    private double comparisonEpsilonMillis
+
+    private double[] topRuntimes
+    private double averageRuntime
+    private double finishedTaskCount
+
     boolean fullSpeedMode
 
-    K8sDVFSSchedulingStrategy(K8sRuntimeEstimator runtimeEstimator, K8sDVFSClient dvfsClient, K8sClientGetter clientGetter) {
+    K8sDVFSSchedulingStrategy(K8sRuntimeEstimator runtimeEstimator,
+                              K8sDVFSClient dvfsClient,
+                              K8sClientGetter clientGetter,
+                              Duration runtimeComparisonEpsilon,
+                              int topRuntimeCount) {
         this.runtimeEstimator = runtimeEstimator
         this.dvfsClient = dvfsClient
         this.nodes = new ArrayList<>()
         this.taskToNode = new HashMap<>();
         this.clientGetter = clientGetter
+        this.comparisonEpsilonMillis = (double)runtimeComparisonEpsilon.toMillis()
+        this.topRuntimes = new double[topRuntimeCount]
+        for (int i = 0; i < topRuntimeCount; i++) {
+            this.topRuntimes[i] = 0.0
+        }
+        this.averageRuntime = 0.0
+        this.finishedTaskCount = 0.0
+    }
+
+    private boolean isInTopRuntimes(double rt) {
+        for (int i = 0; i < topRuntimes.size(); i++) {
+            if (rt >= topRuntimes[i])
+                return true
+        }
+        return false
+    }
+
+    private void updateTopRuntimes(double rt) {
+        for (int i = 0; i < topRuntimes.size(); i++) {
+            if (rt > topRuntimes[i]) {
+                /* Move all one down */
+                for (int j = topRuntimes.size() - 1; j > i; j--) {
+                    topRuntimes[j] = topRuntimes[j - 1];
+                }
+                topRuntimes[i] = rt
+                break
+            }
+        }
     }
 
     @Override
@@ -199,11 +234,11 @@ class K8sDVFSSchedulingStrategy implements K8sSchedulingStrategy {
         /* Step 1: Sort by task priority. We will attempt to schedule tasks "in order", so that the
          * highest priority tasks are assigned to nodes as soon as possible.
          *
-         * Priority is based on a) an estimation if the task is on the critical path and b) the wait time of the task.
+         * Priority is based on a) the tasks estimated runtime and b) the wait time of the task.
          */
         SchedulingRequestComparator comparator = new SchedulingRequestComparator()
         comparator.runtimeEstimator = runtimeEstimator
-        comparator.avgRuntime = averageRuntime
+        comparator.epsilon = comparisonEpsilonMillis
         comparator.currentTime = System.currentTimeMillis()
         queue.sort(comparator)
 
@@ -214,7 +249,7 @@ class K8sDVFSSchedulingStrategy implements K8sSchedulingStrategy {
              * frequency. If not, we determine a frequency (see below).
              */
             final double taskEstimation = runtimeEstimator.estimate(req.handler)
-            final boolean isCriticalPath = taskEstimation > averageRuntime
+            final boolean isCriticalPath = isInTopRuntimes(taskEstimation)
             long frequency = globalMaxFrequency
             if (!isCriticalPath && !fullSpeedMode) {
                 /* Set frequency so that we expect the runtime to be close to the mean runtime. */
@@ -280,8 +315,9 @@ class K8sDVFSSchedulingStrategy implements K8sSchedulingStrategy {
          * elapsed time based on that.
          */
         double runtime = (double)(task.getCompleteTimeMillis() - task.getStartTimeMillis())
-        averageRuntime = (runtime + finishedTaskCount * averageRuntime) / (finishedTaskCount + 1)
+        averageRuntime = (runtime + finishedTaskCount * averageRuntime) / (finishedTaskCount + 1.0)
-        finishedTaskCount += 1
+        finishedTaskCount += 1.0
+        updateTopRuntimes(runtime)
 
         /* Free resources allocated by this task */
         WorkerNode node = taskToNode.get(task.task.hash.toString())

test/nextflow.config

@@ -22,11 +22,13 @@ k8s {
     projectDir = '/workspace/projects'
     cleanup = true
 
-	nextflowImage = 'gitea.kleine.eulenhexe.de/kevin/ma/nextflow-dvfs:0.8.18'
+	nextflowImage = 'gitea.kleine.eulenhexe.de/kevin/ma/nextflow-dvfs:0.8.19'
 	imagePullPolicy = 'IfNotPresent'
 	schedulerInterval = '1m'
 	recordTaskRuntimes = true
-	schedulingStrategy = 'DVFS-SPEED'
+	schedulingStrategy = 'DVFS'
+	runtimeComparisonEpsilon = '10s'
+	dvfsSchedulingTopRuntimes = 3
 
 	nodeInit {
 		enabled = true