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

Example 1 with ConfigurablePageCursorTracerSupplier

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

the class MuninnPageCacheTest method mustFlushDirtyPagesOnEvictingAllPages.

@Test
public void mustFlushDirtyPagesOnEvictingAllPages() throws Exception {
    writeInitialDataTo(file("a"));
    RecordingPageCacheTracer tracer = new RecordingPageCacheTracer();
    RecordingPageCursorTracer cursorTracer = new RecordingPageCursorTracer(Fault.class);
    ConfigurablePageCursorTracerSupplier cursorTracerSupplier = new ConfigurablePageCursorTracerSupplier(cursorTracer);
    MuninnPageCache pageCache = createPageCache(fs, 4, 8, blockCacheFlush(tracer), cursorTracerSupplier);
    PagedFile pagedFile = pageCache.map(file("a"), 8);
    try (PageCursor cursor = pagedFile.io(0, PF_SHARED_WRITE_LOCK | PF_NO_GROW)) {
        assertTrue(cursor.next());
        cursor.putLong(0L);
        assertTrue(cursor.next());
        cursor.putLong(0L);
        assertFalse(cursor.next());
    }
    cursorTracer.reportEvents();
    assertNotNull(cursorTracer.observe(Fault.class));
    assertNotNull(cursorTracer.observe(Fault.class));
    assertEquals(2, cursorTracer.faults());
    assertEquals(2, tracer.faults());
    int clockArm = pageCache.evictPages(2, 0, tracer.beginPageEvictions(2));
    assertThat(clockArm, is(2));
    assertNotNull(tracer.observe(Evict.class));
    assertNotNull(tracer.observe(Evict.class));
    ByteBuffer buf = ByteBuffer.allocate(16);
    StoreChannel channel = fs.open(file("a"), "r");
    channel.read(buf);
    buf.flip();
    assertThat(buf.getLong(), is(0L));
    assertThat(buf.getLong(), is(0L));
}

Example 2 with ConfigurablePageCursorTracerSupplier

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

the class PageCacheTest method tracerMustBeNotifiedOfReadAndWritePins.

@Test
public void tracerMustBeNotifiedOfReadAndWritePins() throws Exception {
    final AtomicInteger writeCount = new AtomicInteger();
    final AtomicInteger readCount = new AtomicInteger();
    DefaultPageCacheTracer tracer = new DefaultPageCacheTracer();
    DefaultPageCursorTracer pageCursorTracer = new DefaultPageCursorTracer() {

        @Override
        public PinEvent beginPin(boolean writeLock, long filePageId, PageSwapper swapper) {
            (writeLock ? writeCount : readCount).getAndIncrement();
            return super.beginPin(writeLock, filePageId, swapper);
        }
    };
    ConfigurablePageCursorTracerSupplier cursorTracerSupplier = new ConfigurablePageCursorTracerSupplier(pageCursorTracer);
    generateFileWithRecords(file("a"), recordCount, recordSize);
    getPageCache(fs, maxPages, pageCachePageSize, tracer, cursorTracerSupplier);
    int pinsForRead = 13;
    int pinsForWrite = 42;
    try (PagedFile pagedFile = pageCache.map(file("a"), filePageSize)) {
        try (PageCursor cursor = pagedFile.io(0, PF_SHARED_READ_LOCK)) {
            for (int i = 0; i < pinsForRead; i++) {
                assertTrue(cursor.next());
            }
        }
        dirtyManyPages(pagedFile, pinsForWrite);
    }
    assertThat("wrong read pin count", readCount.get(), is(pinsForRead));
    assertThat("wrong write pin count", writeCount.get(), is(pinsForWrite));
}

Example 3 with ConfigurablePageCursorTracerSupplier

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

the class MuninnPageCacheTest method mustFlushDirtyPagesOnEvictingFirstPage.

@Test
public void mustFlushDirtyPagesOnEvictingFirstPage() throws Exception {
    writeInitialDataTo(file("a"));
    RecordingPageCacheTracer tracer = new RecordingPageCacheTracer();
    RecordingPageCursorTracer cursorTracer = new RecordingPageCursorTracer();
    ConfigurablePageCursorTracerSupplier cursorTracerSupplier = new ConfigurablePageCursorTracerSupplier(cursorTracer);
    MuninnPageCache pageCache = createPageCache(fs, 2, 8, blockCacheFlush(tracer), cursorTracerSupplier);
    PagedFile pagedFile = pageCache.map(file("a"), 8);
    try (PageCursor cursor = pagedFile.io(0, PF_SHARED_WRITE_LOCK)) {
        assertTrue(cursor.next());
        cursor.putLong(0L);
    }
    cursorTracer.reportEvents();
    assertNotNull(cursorTracer.observe(Fault.class));
    assertEquals(1, cursorTracer.faults());
    assertEquals(1, tracer.faults());
    int clockArm = pageCache.evictPages(1, 0, tracer.beginPageEvictions(1));
    assertThat(clockArm, is(1));
    assertNotNull(tracer.observe(Evict.class));
    ByteBuffer buf = ByteBuffer.allocate(16);
    StoreChannel channel = fs.open(file("a"), "r");
    channel.read(buf);
    buf.flip();
    assertThat(buf.getLong(), is(0L));
    assertThat(buf.getLong(), is(y));
}

Example 4 with ConfigurablePageCursorTracerSupplier

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

the class MuninnPageCacheTest method mustEvictCleanPageWithoutFlushing.

@Test
public void mustEvictCleanPageWithoutFlushing() throws Exception {
    writeInitialDataTo(file("a"));
    RecordingPageCacheTracer tracer = new RecordingPageCacheTracer();
    RecordingPageCursorTracer cursorTracer = new RecordingPageCursorTracer();
    ConfigurablePageCursorTracerSupplier cursorTracerSupplier = new ConfigurablePageCursorTracerSupplier(cursorTracer);
    MuninnPageCache pageCache = createPageCache(fs, 2, 8, blockCacheFlush(tracer), cursorTracerSupplier);
    PagedFile pagedFile = pageCache.map(file("a"), 8);
    try (PageCursor cursor = pagedFile.io(0, PF_SHARED_READ_LOCK)) {
        assertTrue(cursor.next());
    }
    cursorTracer.reportEvents();
    assertNotNull(cursorTracer.observe(Fault.class));
    assertEquals(1, cursorTracer.faults());
    assertEquals(1, tracer.faults());
    int clockArm = pageCache.evictPages(1, 0, tracer.beginPageEvictions(1));
    assertThat(clockArm, is(1));
    assertNotNull(tracer.observe(Evict.class));
}

Example 5 with ConfigurablePageCursorTracerSupplier

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

the class MuninnPageCacheTest method mustFlushDirtyPagesOnEvictingLastPage.

@Test
public void mustFlushDirtyPagesOnEvictingLastPage() throws Exception {
    writeInitialDataTo(file("a"));
    RecordingPageCacheTracer tracer = new RecordingPageCacheTracer();
    RecordingPageCursorTracer cursorTracer = new RecordingPageCursorTracer();
    ConfigurablePageCursorTracerSupplier cursorTracerSupplier = new ConfigurablePageCursorTracerSupplier(cursorTracer);
    MuninnPageCache pageCache = createPageCache(fs, 2, 8, blockCacheFlush(tracer), cursorTracerSupplier);
    PagedFile pagedFile = pageCache.map(file("a"), 8);
    try (PageCursor cursor = pagedFile.io(1, PF_SHARED_WRITE_LOCK)) {
        assertTrue(cursor.next());
        cursor.putLong(0L);
    }
    cursorTracer.reportEvents();
    assertNotNull(cursorTracer.observe(Fault.class));
    assertEquals(1, cursorTracer.faults());
    assertEquals(1, tracer.faults());
    int clockArm = pageCache.evictPages(1, 0, tracer.beginPageEvictions(1));
    assertThat(clockArm, is(1));
    assertNotNull(tracer.observe(Evict.class));
    ByteBuffer buf = ByteBuffer.allocate(16);
    StoreChannel channel = fs.open(file("a"), "r");
    channel.read(buf);
    buf.flip();
    assertThat(buf.getLong(), is(x));
    assertThat(buf.getLong(), is(0L));
}