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

Example 11 with DefaultPageCacheTracer

use of org.neo4j.io.pagecache.tracing.DefaultPageCacheTracer in project neo4j by neo4j.

the class PageCacheTest method noFaultReadOfPagesNotInMemory.

@Test
void noFaultReadOfPagesNotInMemory() throws Exception {
    DefaultPageCacheTracer cacheTracer = new DefaultPageCacheTracer();
    getPageCache(fs, maxPages, cacheTracer);
    Path file = file("a");
    generateFileWithRecords(file, recordsPerFilePage * 2, recordSize);
    long initialFaults = cacheTracer.faults();
    try (PagedFile pf = map(file, filePageSize);
        CursorContext cursorContext = new CursorContext(cacheTracer.createPageCursorTracer("noFaultReadOfPagesNotInMemory"));
        PageCursor nofault = pf.io(0, PF_SHARED_READ_LOCK | PF_NO_FAULT, cursorContext)) {
        verifyNoFaultAccessToPagesNotInMemory(cacheTracer, cursorContext, nofault, initialFaults);
    }
}

Example 12 with DefaultPageCacheTracer

use of org.neo4j.io.pagecache.tracing.DefaultPageCacheTracer in project neo4j by neo4j.

the class PageCacheTest method noFaultLinkedReadOfPagesNotInMemory.

@Test
void noFaultLinkedReadOfPagesNotInMemory() throws Exception {
    DefaultPageCacheTracer cacheTracer = new DefaultPageCacheTracer();
    getPageCache(fs, maxPages, cacheTracer);
    Path file = file("a");
    generateFileWithRecords(file, recordsPerFilePage * 2, recordSize);
    long initialFaults = cacheTracer.faults();
    try (PagedFile pf = map(file, filePageSize);
        CursorContext cursorContext = new CursorContext(cacheTracer.createPageCursorTracer("noFaultLinkedReadOfPagesNotInMemory"));
        PageCursor nofault = pf.io(0, PF_SHARED_READ_LOCK | PF_NO_FAULT, cursorContext);
        PageCursor linkedNoFault = nofault.openLinkedCursor(0)) {
        verifyNoFaultAccessToPagesNotInMemory(cacheTracer, cursorContext, linkedNoFault, initialFaults);
    }
}

Example 13 with DefaultPageCacheTracer

use of org.neo4j.io.pagecache.tracing.DefaultPageCacheTracer in project neo4j by neo4j.

the class PageCacheTest method pinEventShouldCompleteIfRepinFromShouldRetryThrows.

@Test
void pinEventShouldCompleteIfRepinFromShouldRetryThrows() throws IOException {
    DefaultPageCacheTracer tracer = new DefaultPageCacheTracer();
    RandomAdversary adversary = new RandomAdversary(0.0, 0.9, 0.0);
    adversary.setProbabilityFactor(0.0);
    AdversarialFileSystemAbstraction afs = new AdversarialFileSystemAbstraction(adversary, fs);
    getPageCache(afs, maxPages, tracer);
    generateFileWithRecords(file("a"), recordCount, recordSize);
    try (PagedFile pagedFile = map(file("a"), filePageSize);
        CursorContext cursorContext = new CursorContext(tracer.createPageCursorTracer("test"))) {
        try (PageCursor reader = pagedFile.io(0, PF_SHARED_READ_LOCK, cursorContext)) {
            assertTrue(reader.next());
            // Cause the page under the reader cursor to be evicted.
            try (PagedFile otherPagedFile = map(existingFile("b"), filePageSize)) {
                assertThrows(IOException.class, () -> {
                    // noinspection InfiniteLoopStatement
                    for (; ; ) {
                        adversary.setProbabilityFactor(1.0);
                        try {
                            reader.shouldRetry();
                        } finally {
                            adversary.setProbabilityFactor(0.0);
                        }
                        try (PageCursor writer = otherPagedFile.io(0, PF_SHARED_WRITE_LOCK, cursorContext)) {
                            for (int i = 0; i < maxPages * 10; i++) {
                                assertTrue(writer.next(i));
                            }
                        }
                        otherPagedFile.flushAndForce();
                    }
                });
            }
        }
    }
    // Then we should see pins and unpins pair up exactly.
    assertThat(tracer.unpins()).isEqualTo(tracer.pins());
}

Example 14 with DefaultPageCacheTracer

use of org.neo4j.io.pagecache.tracing.DefaultPageCacheTracer in project neo4j by neo4j.

the class ReadOnlyLogVersionRepositoryIT method tracePageCacheAccessOnReadOnlyLogRepoConstruction.

@Test
void tracePageCacheAccessOnReadOnlyLogRepoConstruction() throws IOException {
    var pageCacheTracer = new DefaultPageCacheTracer();
    var cursorContext = new CursorContext(pageCacheTracer.createPageCursorTracer("tracePageCacheAccessOnReadOnlyLogRepoConstruction"));
    new ReadOnlyLogVersionRepository(pageCache, databaseLayout, cursorContext);
    PageCursorTracer cursorTracer = cursorContext.getCursorTracer();
    assertThat(cursorTracer.pins()).isEqualTo(2);
    assertThat(cursorTracer.unpins()).isEqualTo(2);
    assertThat(cursorTracer.hits()).isEqualTo(2);
}

Example 15 with DefaultPageCacheTracer

use of org.neo4j.io.pagecache.tracing.DefaultPageCacheTracer in project neo4j by neo4j.

the class CommitProcessTracingIT method tracePageCacheAccessOnEmptyTransactionApply.

@Test
void tracePageCacheAccessOnEmptyTransactionApply() throws TransactionFailureException {
    var transaction = new PhysicalTransactionRepresentation(emptyList(), EMPTY_BYTE_ARRAY, 0, 0, 0, 0, ANONYMOUS);
    var pageCacheTracer = new DefaultPageCacheTracer();
    try (var cursorContext = new CursorContext(pageCacheTracer.createPageCursorTracer("tracePageCacheAccessOnEmptyTransactionApply"))) {
        assertZeroCursor(cursorContext);
        commitProcess.commit(new TransactionToApply(transaction, cursorContext), NULL, EXTERNAL);
        assertCursor(cursorContext, 2);
    }
}