fix: rely on worker active ELU in least elu strategy

[poolifier.git] / tests / pools / selection-strategies / selection-strategies.test.js

diff --git a/tests/pools/selection-strategies/selection-strategies.test.js b/tests/pools/selection-strategies/selection-strategies.test.js
index da261e89f930b94e52b872cff3c1c2b4796d8f26..dbe286b40e5a46f7b262a700f130f4aad1bf82c4 100644 (file)
--- a/tests/pools/selection-strategies/selection-strategies.test.js
+++ b/tests/pools/selection-strategies/selection-strategies.test.js
@@ -15,6 +15,7 @@ describe('Selection strategies test suite', () => {
     expect(WorkerChoiceStrategies.ROUND_ROBIN).toBe('ROUND_ROBIN')
     expect(WorkerChoiceStrategies.LEAST_USED).toBe('LEAST_USED')
     expect(WorkerChoiceStrategies.LEAST_BUSY).toBe('LEAST_BUSY')
+    expect(WorkerChoiceStrategies.LEAST_ELU).toBe('LEAST_ELU')
     expect(WorkerChoiceStrategies.FAIR_SHARE).toBe('FAIR_SHARE')
     expect(WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN).toBe(
       'WEIGHTED_ROUND_ROBIN'
@@ -122,14 +123,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: false,
-      avgRunTime: false,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -139,14 +145,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: false,
-      avgRunTime: false,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -166,18 +177,26 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: maxMultiplier,
-        running: 0,
-        runTime: 0,
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: maxMultiplier,
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
     }
     expect(
@@ -204,18 +223,26 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: maxMultiplier,
-        running: 0,
-        runTime: 0,
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: maxMultiplier,
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
     }
     expect(
@@ -301,14 +328,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: false,
-      avgRunTime: false,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -318,14 +350,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: false,
-      avgRunTime: false,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -345,18 +382,26 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: maxMultiplier,
-        running: 0,
-        runTime: 0,
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: maxMultiplier,
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
     }
     // We need to clean up the resources after our test
@@ -378,18 +423,27 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: maxMultiplier,
-        running: 0,
-        runTime: 0,
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: maxMultiplier,
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+
+        elu: undefined
       })
     }
     // We need to clean up the resources after our test
@@ -404,14 +458,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: true,
-      avgRunTime: false,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: true,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: true,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -421,14 +480,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: true,
-      avgRunTime: false,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: true,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: true,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -448,22 +512,35 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: expect.any(Number),
-        running: 0,
-        runTime: expect.any(Number),
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: expect.any(Number),
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: expect.any(Number),
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: expect.any(Number),
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
-      expect(workerNode.tasksUsage.ran).toBeGreaterThan(0)
-      expect(workerNode.tasksUsage.ran).toBeLessThanOrEqual(max * maxMultiplier)
-      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeGreaterThanOrEqual(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeLessThanOrEqual(
+        max * maxMultiplier
+      )
+      expect(workerNode.workerUsage.runTime.aggregate).toBeGreaterThanOrEqual(0)
+      expect(workerNode.workerUsage.waitTime.aggregate).toBeGreaterThanOrEqual(
+        0
+      )
     }
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -484,22 +561,198 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: expect.any(Number),
-        running: 0,
-        runTime: expect.any(Number),
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: expect.any(Number),
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: expect.any(Number),
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: expect.any(Number),
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
-      expect(workerNode.tasksUsage.ran).toBeGreaterThan(0)
-      expect(workerNode.tasksUsage.ran).toBeLessThanOrEqual(max * maxMultiplier)
-      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeLessThanOrEqual(
+        max * maxMultiplier
+      )
+      expect(workerNode.workerUsage.runTime.aggregate).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.waitTime.aggregate).toBeGreaterThan(0)
+    }
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
+  it('Verify LEAST_ELU strategy default tasks usage statistics requirements', async () => {
+    const workerChoiceStrategy = WorkerChoiceStrategies.LEAST_ELU
+    let pool = new FixedThreadPool(
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy }
+    )
+    expect(
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
+    ).toStrictEqual({
+      runTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: true
+    })
+    await pool.destroy()
+    pool = new DynamicThreadPool(
+      min,
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy }
+    )
+    expect(
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
+    ).toStrictEqual({
+      runTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: true
+    })
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
+  it('Verify LEAST_ELU strategy can be run in a fixed pool', async () => {
+    const pool = new FixedThreadPool(
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy: WorkerChoiceStrategies.LEAST_ELU }
+    )
+    // TODO: Create a better test to cover `LeastEluWorkerChoiceStrategy#choose`
+    const promises = new Set()
+    const maxMultiplier = 2
+    for (let i = 0; i < max * maxMultiplier; i++) {
+      promises.add(pool.execute())
+    }
+    await Promise.all(promises)
+    for (const workerNode of pool.workerNodes) {
+      const expectedWorkerUsage = {
+        tasks: {
+          executed: expect.any(Number),
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        }
+      }
+      if (workerNode.workerUsage.elu === undefined) {
+        expect(workerNode.workerUsage).toStrictEqual({
+          ...expectedWorkerUsage,
+          elu: undefined
+        })
+      } else {
+        expect(workerNode.workerUsage).toStrictEqual({
+          ...expectedWorkerUsage,
+          elu: {
+            active: expect.any(Number),
+            idle: 0,
+            utilization: 1
+          }
+        })
+      }
+      expect(workerNode.workerUsage.tasks.executed).toBeGreaterThanOrEqual(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeLessThanOrEqual(
+        max * maxMultiplier
+      )
+    }
+    // We need to clean up the resources after our test
+    await pool.destroy()
+  })
+
+  it('Verify LEAST_ELU strategy can be run in a dynamic pool', async () => {
+    const pool = new DynamicThreadPool(
+      min,
+      max,
+      './tests/worker-files/thread/testWorker.js',
+      { workerChoiceStrategy: WorkerChoiceStrategies.LEAST_ELU }
+    )
+    // TODO: Create a better test to cover `LeastEluWorkerChoiceStrategy#choose`
+    const promises = new Set()
+    const maxMultiplier = 2
+    for (let i = 0; i < max * maxMultiplier; i++) {
+      promises.add(pool.execute())
+    }
+    await Promise.all(promises)
+    for (const workerNode of pool.workerNodes) {
+      const expectedWorkerUsage = {
+        tasks: {
+          executed: expect.any(Number),
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        }
+      }
+      if (workerNode.workerUsage.elu === undefined) {
+        expect(workerNode.workerUsage).toStrictEqual({
+          ...expectedWorkerUsage,
+          elu: undefined
+        })
+      } else {
+        expect(workerNode.workerUsage).toStrictEqual({
+          ...expectedWorkerUsage,
+          elu: {
+            active: expect.any(Number),
+            idle: 0,
+            utilization: 1
+          }
+        })
+      }
+      expect(workerNode.workerUsage.tasks.executed).toBeGreaterThanOrEqual(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeLessThanOrEqual(
+        max * maxMultiplier
+      )
     }
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -513,14 +766,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: true,
-      avgRunTime: true,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: true,
+        average: true,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -530,14 +788,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: true,
-      avgRunTime: true,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: true,
+        average: true,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -557,21 +820,29 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: maxMultiplier,
-        running: 0,
-        runTime: expect.any(Number),
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: expect.any(Number),
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: maxMultiplier,
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: expect.any(Number),
+          average: expect.any(Number),
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
-      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
-      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.runTime.aggregate).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.runTime.average).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -597,21 +868,29 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: maxMultiplier,
-        running: 0,
-        runTime: expect.any(Number),
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: expect.any(Number),
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: maxMultiplier,
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: expect.any(Number),
+          average: expect.any(Number),
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
-      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
-      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.runTime.aggregate).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.runTime.average).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -630,7 +909,7 @@ describe('Selection strategies test suite', () => {
       {
         workerChoiceStrategy: WorkerChoiceStrategies.FAIR_SHARE,
         workerChoiceStrategyOptions: {
-          medRunTime: true
+          runTime: { median: true }
         }
       }
     )
@@ -642,21 +921,29 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: maxMultiplier,
-        running: 0,
-        runTime: expect.any(Number),
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: expect.any(Number),
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: maxMultiplier,
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: expect.any(Number),
+          average: 0,
+          median: expect.any(Number),
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
-      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
-      expect(workerNode.tasksUsage.medRunTime).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.runTime.aggregate).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.runTime.median).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -749,14 +1036,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: true,
-      avgRunTime: true,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: true,
+        average: true,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -766,14 +1058,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: true,
-      avgRunTime: true,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: true,
+        average: true,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -793,23 +1090,33 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: expect.any(Number),
-        running: 0,
-        runTime: expect.any(Number),
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: expect.any(Number),
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: expect.any(Number),
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: expect.any(Number),
+          average: expect.any(Number),
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
-      expect(workerNode.tasksUsage.ran).toBeGreaterThanOrEqual(0)
-      expect(workerNode.tasksUsage.ran).toBeLessThanOrEqual(max * maxMultiplier)
-      expect(workerNode.tasksUsage.runTime).toBeGreaterThanOrEqual(0)
-      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThanOrEqual(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeGreaterThanOrEqual(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeLessThanOrEqual(
+        max * maxMultiplier
+      )
+      expect(workerNode.workerUsage.runTime.aggregate).toBeGreaterThanOrEqual(0)
+      expect(workerNode.workerUsage.runTime.average).toBeGreaterThanOrEqual(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -840,23 +1147,33 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: expect.any(Number),
-        running: 0,
-        runTime: expect.any(Number),
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: expect.any(Number),
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: expect.any(Number),
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: expect.any(Number),
+          average: expect.any(Number),
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
-      expect(workerNode.tasksUsage.ran).toBeGreaterThan(0)
-      expect(workerNode.tasksUsage.ran).toBeLessThanOrEqual(max * maxMultiplier)
-      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
-      expect(workerNode.tasksUsage.avgRunTime).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeLessThanOrEqual(
+        max * maxMultiplier
+      )
+      expect(workerNode.workerUsage.runTime.aggregate).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.runTime.average).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -880,7 +1197,7 @@ describe('Selection strategies test suite', () => {
       {
         workerChoiceStrategy: WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN,
         workerChoiceStrategyOptions: {
-          medRunTime: true
+          runTime: { median: true }
         }
       }
     )
@@ -892,23 +1209,33 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: expect.any(Number),
-        running: 0,
-        runTime: expect.any(Number),
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: expect.any(Number),
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: expect.any(Number),
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: expect.any(Number),
+          average: 0,
+          median: expect.any(Number),
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
-      expect(workerNode.tasksUsage.ran).toBeGreaterThan(0)
-      expect(workerNode.tasksUsage.ran).toBeLessThanOrEqual(max * maxMultiplier)
-      expect(workerNode.tasksUsage.runTime).toBeGreaterThan(0)
-      expect(workerNode.tasksUsage.medRunTime).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.tasks.executed).toBeLessThanOrEqual(
+        max * maxMultiplier
+      )
+      expect(workerNode.workerUsage.runTime.aggregate).toBeGreaterThan(0)
+      expect(workerNode.workerUsage.runTime.median).toBeGreaterThan(0)
     }
     expect(
       pool.workerChoiceStrategyContext.workerChoiceStrategies.get(
@@ -1011,14 +1338,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: false,
-      avgRunTime: false,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     await pool.destroy()
     pool = new DynamicThreadPool(
@@ -1028,14 +1360,19 @@ describe('Selection strategies test suite', () => {
       { workerChoiceStrategy }
     )
     expect(
-      pool.workerChoiceStrategyContext.getRequiredStatistics()
+      pool.workerChoiceStrategyContext.getTaskStatisticsRequirements()
     ).toStrictEqual({
-      runTime: false,
-      avgRunTime: false,
-      medRunTime: false,
-      waitTime: false,
-      avgWaitTime: false,
-      medWaitTime: false
+      runTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      waitTime: {
+        aggregate: false,
+        average: false,
+        median: false
+      },
+      elu: false
     })
     // We need to clean up the resources after our test
     await pool.destroy()
@@ -1058,18 +1395,26 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: maxMultiplier,
-        running: 0,
-        runTime: 0,
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: maxMultiplier,
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
     }
     expect(
@@ -1118,18 +1463,26 @@ describe('Selection strategies test suite', () => {
     }
     await Promise.all(promises)
     for (const workerNode of pool.workerNodes) {
-      expect(workerNode.tasksUsage).toStrictEqual({
-        ran: maxMultiplier,
-        running: 0,
-        runTime: 0,
-        runTimeHistory: expect.any(CircularArray),
-        avgRunTime: 0,
-        medRunTime: 0,
-        waitTime: 0,
-        waitTimeHistory: expect.any(CircularArray),
-        avgWaitTime: 0,
-        medWaitTime: 0,
-        error: 0
+      expect(workerNode.workerUsage).toStrictEqual({
+        tasks: {
+          executed: maxMultiplier,
+          executing: 0,
+          queued: 0,
+          failed: 0
+        },
+        runTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        waitTime: {
+          aggregate: 0,
+          average: 0,
+          median: 0,
+          history: expect.any(CircularArray)
+        },
+        elu: undefined
       })
     }
     expect(