const approxOneMbOfStrings = 131061

const increments = [
  {from: 0, increment: 1},
  {from: 40, increment: 5},
  {from: 100, increment: 10},
  {from: 250, increment: 25},
  {from: 500, increment: 50},
  {from: 1000, increment: 100},
  {from: 2000, increment: 250},
]

export class MemoryTestFragmented {
  async run(
  ): Promise<void> {
    const largeObjects = []

    const allocateMemoryAndRepeat = (): void => {
      const used = Math.round(process.memoryUsage().heapUsed / Math.pow(1024, 2));
      console.log(`Memory usage: ${used}MB`)
      const nextIncrement = increments.findIndex(x => used < x.from)
      const incrementIndex = (nextIncrement === -1 ? increments.length : nextIncrement) - 1
      const increment = increments[incrementIndex].increment
      largeObjects.push(Array(increment * approxOneMbOfStrings).fill("oom1"));
      continueAllocatingMemory()
    }

    const continueAllocatingMemory = (): void => {
      setTimeout(allocateMemoryAndRepeat, 100);
    }

    continueAllocatingMemory()

    await new Promise(() => {}) // Program ends when it OOMs.
  }
}