public void CouldOpenBucketsAndGetBuffers()
{
var path = TestUtils.GetPath();
var buckets = new SharedMemoryBuckets(path);
var available = buckets.GetAvailableFreeSpace();
Console.WriteLine("AVAILABLE: " + available);
for (int i = 0; i <= BufferRef.MaxBucketIdx; i++)
{
var br = BufferRef.Create(i, 1);
var buffer = buckets[br];
var bufferSize = SharedMemoryPool.BucketIndexToBufferSize(i, 4096);
buffer.Span.Fill(0);
Assert.AreEqual(bufferSize, buffer.Length);
}
var sndSmall = BufferRef.Create(0, 40000);
var buffer1 = buckets[sndSmall];
buffer1.Span.Fill(0);
Assert.AreEqual(4096, buffer1.Length);
buckets.Dispose();
}
public void CouldUseSmallPages()
{
var path = TestUtils.GetPath();
var buckets = new SharedMemoryBuckets(path, pageSize: 32, 0);
var tooBigBucket = BufferRef.Create(1, 1);
Assert.Throws <ArgumentException>(() =>
{
var _ = buckets[tooBigBucket];
});
var br = BufferRef.Create(0, 40000);
var buffer1 = buckets[br];
buffer1.Span.Fill(0);
Assert.AreEqual(32, buffer1.Length);
buckets.Dispose();
}
public unsafe void BufferAccessBench()
{
Settings.DoAdditionalCorrectnessChecks = false;
var path = TestUtils.GetPath();
var buckets = new SharedMemoryBuckets(path);
var bufferCount = 100_000; // c.2800 = 12 MB (L3 cache on i7-8700)
using (Benchmark.Run("Init (K)", bufferCount * 1000))
{
for (int i = 0; i < bufferCount; i++)
{
var bi = i + 1;
var br = BufferRef.Create(0, bi);
var buffer = buckets[br];
buffer.WriteInt32(0, bi);
}
}
var count = 10_000_000;
for (int r = 0; r < 10; r++)
{
using (Benchmark.Run("Access Unsafe", count))
{
for (int i = 0; i < count; i++)
{
var bi = 1 + (i % bufferCount);
var br = BufferRef.Create(0, bi);
var buffer = buckets.DangerousGet(br);
if (buffer.Length != 4096)
{
Assert.Fail();
}
if (bi != *(int *)buffer.Data)
{
// Assert.Fail($"bi [{bi}] != buffer.ReadInt32(0) [{buffer.ReadInt32(0)}]");
}
}
}
using (Benchmark.Run("Access Safe", count))
{
for (int i = 0; i < count; i++)
{
var bi = 1 + (i % bufferCount);
var br = BufferRef.Create(0, bi);
var buffer = buckets[br];
if (buffer.Length != 4096)
{
Assert.Fail();
}
if (bi != *(int *)buffer.Data)
{
// Assert.Fail($"bi [{bi}] != buffer.ReadInt32(0) [{buffer.ReadInt32(0)}]");
}
}
}
}
Benchmark.Dump();
buckets.Dispose();
}
