Examples with PageCursorTracer org.neo4j.io.pagecache.tracing.cursor.PageCursorTracer used on opensource projects

Example 26 with PageCursorTracer

use of org.neo4j.io.pagecache.tracing.cursor.PageCursorTracer in project neo4j by neo4j.

the class ReadOnlyTransactionIdStoreIT method testPageCacheAccessOnTransactionIdStoreConstruction.

@Test
void testPageCacheAccessOnTransactionIdStoreConstruction() throws IOException {
    var pageCacheTracer = new DefaultPageCacheTracer();
    var cursorContext = new CursorContext(pageCacheTracer.createPageCursorTracer("testPageCacheAccessOnTransactionIdStoreConstruction"));
    new ReadOnlyTransactionIdStore(fs, pageCache, databaseLayout, cursorContext);
    PageCursorTracer cursorTracer = cursorContext.getCursorTracer();
    assertThat(cursorTracer.pins()).isEqualTo(4);
    assertThat(cursorTracer.unpins()).isEqualTo(4);
    assertThat(cursorTracer.hits()).isEqualTo(4);
}

Example 27 with PageCursorTracer

use of org.neo4j.io.pagecache.tracing.cursor.PageCursorTracer in project neo4j by neo4j.

the class TxStateTransactionDataSnapshotIT method assertZeroTracer.

private void assertZeroTracer(CursorContext cursorContext) {
    PageCursorTracer cursorTracer = cursorContext.getCursorTracer();
    assertThat(cursorTracer.pins()).isZero();
    assertThat(cursorTracer.hits()).isZero();
    assertThat(cursorTracer.unpins()).isZero();
}

Example 28 with PageCursorTracer

use of org.neo4j.io.pagecache.tracing.cursor.PageCursorTracer in project neo4j by neo4j.

the class CountsComputerTest method tracePageCacheAccessOnInitialization.

@Test
void tracePageCacheAccessOnInitialization() throws IOException {
    DatabaseManagementService managementService = dbBuilder.build();
    try {
        GraphDatabaseAPI db = (GraphDatabaseAPI) managementService.database(DEFAULT_DATABASE_NAME);
        var countsStore = db.getDependencyResolver().resolveDependency(GBPTreeCountsStore.class);
        var pageCacheTracer = new DefaultPageCacheTracer();
        var cursorContext = new CursorContext(pageCacheTracer.createPageCursorTracer("tracePageCacheAccessOnInitialization"));
        countsStore.start(cursorContext, INSTANCE);
        PageCursorTracer cursorTracer = cursorContext.getCursorTracer();
        softly.assertThat(cursorTracer.pins()).as("Pins").isEqualTo(1);
        softly.assertThat(cursorTracer.unpins()).as("Unpins").isEqualTo(1);
        softly.assertThat(cursorTracer.hits()).as("hits").isEqualTo(1);
    } finally {
        managementService.shutdown();
    }
}

Example 29 with PageCursorTracer

use of org.neo4j.io.pagecache.tracing.cursor.PageCursorTracer in project neo4j by neo4j.

the class NodeEntityTest method traceNodePageCacheAccessOnRelationshipsAccess.

@Test
void traceNodePageCacheAccessOnRelationshipsAccess() {
    long targetId;
    var relationshipType = RelationshipType.withName("connection");
    try (Transaction tx = db.beginTx()) {
        var target = tx.createNode();
        for (int i = 0; i < 100; i++) {
            tx.createNode().createRelationshipTo(target, relationshipType);
        }
        targetId = target.getId();
        tx.commit();
    }
    try (Transaction tx = db.beginTx()) {
        var cursorContext = ((InternalTransaction) tx).kernelTransaction().cursorContext();
        PageCursorTracer cursorTracer = cursorContext.getCursorTracer();
        var source = tx.getNodeById(targetId);
        cursorTracer.reportEvents();
        assertZeroTracer(cursorContext);
        assertThat(count(source.getRelationships(Direction.INCOMING, relationshipType))).isGreaterThan(0);
        assertThat(cursorTracer.hits()).isEqualTo(3);
        assertThat(cursorTracer.unpins()).isEqualTo(2);
        assertThat(cursorTracer.pins()).isEqualTo(3);
    }
}

Example 30 with PageCursorTracer

use of org.neo4j.io.pagecache.tracing.cursor.PageCursorTracer in project neo4j by neo4j.

the class NodeEntityTest method traceNodePageCacheAccessOnDegreeCount.

@Test
void traceNodePageCacheAccessOnDegreeCount() {
    long sourceId;
    try (Transaction tx = db.beginTx()) {
        var source = tx.createNode();
        var relationshipType = RelationshipType.withName("connection");
        createDenseNodeWithShortIncomingChain(tx, source, relationshipType);
        sourceId = source.getId();
        tx.commit();
    }
    try (Transaction tx = db.beginTx()) {
        var cursorContext = ((InternalTransaction) tx).kernelTransaction().cursorContext();
        PageCursorTracer cursorTracer = cursorContext.getCursorTracer();
        var source = tx.getNodeById(sourceId);
        cursorTracer.reportEvents();
        assertZeroTracer(cursorContext);
        source.getDegree(Direction.INCOMING);
        assertThat(cursorTracer.hits()).isEqualTo(3);
        assertThat(cursorTracer.unpins()).isEqualTo(0);
        assertThat(cursorTracer.pins()).isEqualTo(3);
    }
}