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ProfilingTracerTest.scala
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ProfilingTracerTest.scala
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.cypher.internal.compiled_runtime.v3_2.codegen.profiling
import org.neo4j.cypher.internal.compiler.v3_2.planDescription.Id
import org.neo4j.cypher.internal.compiler.v3_2.spi.{EmptyKernelStatisticProvider, KernelStatisticProvider}
import org.neo4j.cypher.internal.frontend.v3_2.test_helpers.CypherFunSuite
import org.neo4j.io.pagecache.tracing.cursor.DefaultPageCursorTracer
class ProfilingTracerTest extends CypherFunSuite {
class Clock extends ProfilingTracer.Clock {
var nanoTime: Long = 0L
def progress(nanos: Long) {
assert(nanos > 0, "time must move forwards")
nanoTime += nanos
}
}
test("shouldReportExecutionTimeOfQueryExecution") {
// given
val clock = new Clock
val operatorId = new Id
val tracer = new ProfilingTracer(clock, EmptyKernelStatisticProvider)
val event = tracer.executeOperator(operatorId)
// when
clock.progress(516)
event.close()
// then
tracer.timeOf(operatorId) should equal(516)
}
test("multiple uses of the same Id should aggregate spent time") {
// given
val clock = new Clock
val operatorId = new Id
val tracer = new ProfilingTracer(clock, EmptyKernelStatisticProvider)
// when
val event1 = tracer.executeOperator(operatorId)
clock.progress(12)
event1.close()
val event2 = tracer.executeOperator(operatorId)
clock.progress(45)
event2.close()
// then
tracer.timeOf(operatorId) should equal(12 + 45)
}
test("shouldReportDbHitsOfQueryExecution") {
// given
val operatorId = new Id
val tracer = new ProfilingTracer(EmptyKernelStatisticProvider)
val event = tracer.executeOperator(operatorId)
// when
(0 until 516).foreach { _ =>
event.dbHit()
}
event.close()
// then
tracer.dbHitsOf(operatorId) should equal(516)
}
test("shouldReportRowsOfQueryExecution") {
// given
val operatorId = new Id
val tracer = new ProfilingTracer(EmptyKernelStatisticProvider)
val event = tracer.executeOperator(operatorId)
// when
(0 until 516).foreach { _ =>
event.row()
}
event.close()
// then
tracer.rowsOf(operatorId) should equal(516)
}
test("report page cache hits as part of profiling statistics") {
val operatorId = new Id
val cursorTracer = new DefaultPageCursorTracer
var tracer = new ProfilingTracer(new DelegatingKernelStatisticProvider(cursorTracer))
val event = tracer.executeOperator(operatorId)
1 to 100 foreach { _ => {
val pin = cursorTracer.beginPin(false, 1, null)
pin.hit()
pin.done()
}
}
event.close()
val information = tracer.get(operatorId)
information.pageCacheHits() should equal(100)
}
test("report page cache misses as part of profiling statistics") {
val operatorId = new Id
val cursorTracer = new DefaultPageCursorTracer
var tracer = new ProfilingTracer(new DelegatingKernelStatisticProvider(cursorTracer))
val event = tracer.executeOperator(operatorId)
1 to 17 foreach { _ => {
val pin = cursorTracer.beginPin(false, 1, null)
val pageFault = pin.beginPageFault()
pageFault.done()
pin.done()
}
}
event.close()
val information = tracer.get(operatorId)
information.pageCacheMisses() should equal(17)
}
class DelegatingKernelStatisticProvider(tracer: DefaultPageCursorTracer) extends KernelStatisticProvider {
override def getPageCacheHits: Long = tracer.hits()
override def getPageCacheMisses: Long = tracer.faults()
}
}