public void LevelMergeReadTest2()
{
string path = Path.GetFullPath("TestData\\LevelMergeReadTest2");
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
int num_tables_to_merge = 4;
int items_per_table = 2500;
int totalData = 0;
for (int i = 0; i < num_tables_to_merge; i++)
{
var mt = new MemTable();
for (int j = 0; j < items_per_table; j++)
{
var randKey = Key.Random(40);
var randVal = Value.Random(512);
mt.Add(randKey, randVal);
}
mt.WriteToSortedBlockTable("TestData\\LevelMergeReadTest2", 0, i);
totalData += mt.Size;
}
var cache = new RazorCache();
int ct = 0;
Key key = new Key(new ByteArray(new byte[] { 0 }));
var timer = new Stopwatch();
timer.Start();
foreach (var pair in SortedBlockTable.EnumerateMergedTablesPreCached(cache, "TestData\\LevelMergeReadTest2",
new List <PageRef> {
new PageRef {
Level = 0, Version = 0
},
new PageRef {
Level = 0, Version = 1
},
new PageRef {
Level = 0, Version = 2
},
new PageRef {
Level = 0, Version = 3
}
}, ExceptionHandling.ThrowAll, null))
{
Assert.True(key.CompareTo(pair.Key) < 0);
key = pair.Key;
ct++;
}
timer.Stop();
Console.WriteLine("Scanned through a multilevel merge at a throughput of {0} MB/s", (double)totalData / timer.Elapsed.TotalSeconds / (1024.0 * 1024.0));
}
