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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2023 Nordix Foundation
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.integration
import java.util.concurrent.TimeUnit
import spock.lang.Specification
class ResourceMeterPerfTest extends Specification {
final int MEGABYTE = 1_000_000
def resourceMeter = new ResourceMeter()
def 'ResourceMeter accurately measures duration'() {
when: 'we measure how long a known operation takes'
resourceMeter.start()
TimeUnit.SECONDS.sleep(2)
resourceMeter.stop()
then: 'ResourceMeter reports a duration within 10ms of the expected duration'
assert resourceMeter.getTotalTimeInSeconds() >= 2
assert resourceMeter.getTotalTimeInSeconds() <= 2.01
}
def 'ResourceMeter reports memory usage when allocating a large byte array'() {
when: 'the resource meter is started'
resourceMeter.start()
and: 'some memory is allocated'
byte[] array = new byte[50 * MEGABYTE]
and: 'the resource meter is stopped'
resourceMeter.stop()
then: 'the reported memory usage is close to the amount of memory allocated'
assert resourceMeter.getTotalMemoryUsageInMB() >= 50
assert resourceMeter.getTotalMemoryUsageInMB() <= 55
}
def 'ResourceMeter measures PEAK memory usage when garbage collector runs'() {
when: 'the resource meter is started'
resourceMeter.start()
and: 'some memory is allocated'
byte[] array = new byte[50 * MEGABYTE]
and: 'the memory is garbage collected'
array = null
ResourceMeter.performGcAndWait()
and: 'the resource meter is stopped'
resourceMeter.stop()
then: 'the reported memory usage is close to the peak amount of memory allocated'
assert resourceMeter.getTotalMemoryUsageInMB() >= 50
assert resourceMeter.getTotalMemoryUsageInMB() <= 55
}
def 'ResourceMeter measures memory increase only during measurement'() {
given: '50 megabytes is allocated before measurement'
byte[] arrayBefore = new byte[50 * MEGABYTE]
when: 'memory is allocated during measurement'
resourceMeter.start()
byte[] arrayDuring = new byte[40 * MEGABYTE]
resourceMeter.stop()
and: '50 megabytes is allocated after measurement'
byte[] arrayAfter = new byte[50 * MEGABYTE]
then: 'the reported memory usage is close to the amount allocated DURING measurement'
assert resourceMeter.getTotalMemoryUsageInMB() >= 40
assert resourceMeter.getTotalMemoryUsageInMB() <= 45
}
}
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