/*
 * Copyright 2016-present Facebook, Inc.
 *
 * 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 com.facebook.buck.util.concurrent;

public class ResourceAmountsEstimator {

  /**
   * CPU resource amount is considered as number of cores. Each core can perform a single job.
   */
  public static final int DEFAULT_CPU_CAP = Runtime.getRuntime().availableProcessors();

  /**
   * Memory resource unit size has been chosen arbitrarily. We can tune the value if we need.
   */
  public static final int DEFAULT_MEMORY_CAP =
      (int) (Runtime.getRuntime().maxMemory() / 100 * 1024 * 1024);

  /**
   * Disk IO resource unit size has been chosen arbitrarily. Since most of the jobs are light,
   * we think disk can handle this amount of light jobs: reading/writing some small data.
   */
  public static final int DEFAULT_DISK_IO_CAP = 50;

  /**
   * Network IO resource unit size has been chosen arbitrarily. Since most of the jobs are light,
   * we think network can handle this amount of light jobs: sending/receiving some small data.
   */
  public static final int DEFAULT_NETWORK_IO_CAP = 30;

  private ResourceAmountsEstimator() {}

  public static ResourceAmounts getEstimatedAmounts() {
    return ResourceAmounts.of(
        DEFAULT_CPU_CAP,
        DEFAULT_MEMORY_CAP,
        DEFAULT_DISK_IO_CAP,
        DEFAULT_NETWORK_IO_CAP);
  }
}

/*
 * Copyright 2016-present Facebook, Inc.
 *
 * 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 com.facebook.buck.util.concurrent;

public class ResourceAmountsEstimator {

  /**
   * CPU resource amount is considered as number of cores. Each core can perform a single job.
   */
  public static final int DEFAULT_CPU_CAP = Runtime.getRuntime().availableProcessors();

  /**
   * Memory resource unit size has been chosen arbitrarily. We can tune the value if we need.
   */
  public static final int DEFAULT_MEMORY_CAP =
      (int) (Runtime.getRuntime().maxMemory() / (100 * 1024 * 1024));

  /**
   * Disk IO resource unit size has been chosen arbitrarily. Since most of the jobs are light,
   * we think disk can handle this amount of light jobs: reading/writing some small data.
   */
  public static final int DEFAULT_DISK_IO_CAP = 50;

  /**
   * Network IO resource unit size has been chosen arbitrarily. Since most of the jobs are light,
   * we think network can handle this amount of light jobs: sending/receiving some small data.
   */
  public static final int DEFAULT_NETWORK_IO_CAP = 30;

  private ResourceAmountsEstimator() {}

  public static ResourceAmounts getEstimatedAmounts() {
    return ResourceAmounts.of(
        DEFAULT_CPU_CAP,
        DEFAULT_MEMORY_CAP,
        DEFAULT_DISK_IO_CAP,
        DEFAULT_NETWORK_IO_CAP);
  }
}

Fix memory resource estimation