public void Cache_scenario_write_consistency_with_multiple_merges()
{
var r = new Random(1234);
var keys = new Queue <string>();
AddItems(keys, 200);
using (var d = new FirkinDictionary <string, string>(
_path,
1024 * 1024,
Serialization.SerializerRepository.GetByteArraySerializer <string>(),
Serialization.SerializerRepository.GetStreamSerializer <string>()
)) {
var dictionary = new Dictionary <string, string>();
var n = 0;
var t = 0;
while (keys.Any())
{
n++;
t++;
var key = keys.Dequeue();
var v = TestUtil.GetRandomString(r);
dictionary[key] = v;
if (d.ContainsKey(key))
{
var x = d[key];
}
d[key] = v;
switch (r.Next(10))
{
case 1:
keys.Enqueue(key);
break;
case 4:
AddItems(keys, 10);
break;
}
if (n >= 3000)
{
d.Merge();
n = 0;
}
if (t >= 20000)
{
break;
}
}
foreach (var file in Directory.GetFiles(_path))
{
_log.DebugFormat(Path.GetFileName(file));
}
_log.DebugFormat("total items {0} after {1} iterations with {2} left in queue", d.Count, t, keys.Count);
Assert.AreEqual(dictionary.Count, d.Count);
foreach (var pair in dictionary)
{
Assert.AreEqual(pair.Value, d[pair.Key]);
}
}
}
public void Memory_consumption_parallel_writes_and_merges()
{
var r = new Random(1234);
var keys = new Queue <string>();
AddItems(keys, 200);
var baseline = GC.GetTotalMemory(true);
using (var d = new FirkinDictionary <string, string>(_path)) {
var t = 0;
var capture = "";
var done = false;
var n = 0;
var merger = new Thread(() => {
var m = 0;
while (!done)
{
if (n >= 5000)
{
m++;
var before = GC.GetTotalMemory(true);
Console.WriteLine(
"merge {0}, before {1:0.00}MB)",
m,
(before - baseline) / 1024 / 1024
);
var expiredKeys = (from entry in d
where entry.Value.Length != 0 && r.Next(4) == 1
select entry.Key).ToArray();
foreach (var key in expiredKeys)
{
d.Remove(key);
}
var during = GC.GetTotalMemory(true);
Console.WriteLine(
"merge {0}, during {1:0.00}MB)",
m,
(during - baseline) / 1024 / 1024
);
d.Merge();
var after = GC.GetTotalMemory(true);
var c = d.Count;
Console.WriteLine(
"merge {0}, iteration {1}, items: {2}, after {3:0.00}MB, storage {4:0.00}bytes/item)",
m,
t,
c,
(after - baseline) / 1024 / 1024,
(after - baseline) / c
);
n = 0;
}
}
})
{
IsBackground = true
};
merger.Start();
while (keys.Any())
{
n++;
t++;
var key = keys.Dequeue();
var v = TestUtil.GetRandomString(r);
if (d.ContainsKey(key))
{
var x = d[key];
capture = ".." + x;
}
d[key] = v;
switch (r.Next(10))
{
case 1:
keys.Enqueue(key);
break;
case 4:
if (keys.Count < 200)
{
AddItems(keys, 10);
}
break;
}
if (t >= 1000000)
{
break;
}
if (keys.Count < 50)
{
AddItems(keys, 100);
}
}
done = true;
merger.Join();
Console.WriteLine("total items {0} after {1} iterations with {2} left in queue", d.Count, t, keys.Count);
_log.Debug(capture.Substring(0, 10));
}
}
public void Memory_consumption()
{
var r = new Random(1234);
var keys = new Queue <string>();
AddItems(keys, 200);
var baseline = GC.GetTotalMemory(true);
string capture = "";
using (var d = new FirkinDictionary <string, string>(_path)) {
var n = 0;
var t = 0;
var m = 0;
while (keys.Any())
{
n++;
t++;
var key = keys.Dequeue();
var v = TestUtil.GetRandomString(r);
if (d.ContainsKey(key))
{
var x = d[key];
capture = ".." + x;
}
d[key] = v;
switch (r.Next(10))
{
case 1:
keys.Enqueue(key);
break;
case 4:
if (keys.Count < 200)
{
AddItems(keys, 10);
}
break;
}
if (n >= 5000)
{
m++;
var before = GC.GetTotalMemory(true);
d.Merge();
var after = GC.GetTotalMemory(true);
var c = d.Count;
Console.WriteLine(
"merge {0}, iteration {1}, items: {2}, before {3:0.00}MB, after {4:0.00}MB, storage {5:0.00}bytes/item)",
m,
t,
c,
(before - baseline) / 1024 / 1024,
(after - baseline) / 1024 / 1024,
(after - baseline) / c
);
n = 0;
}
if (t >= 200000)
{
break;
}
if (keys.Count < 50)
{
AddItems(keys, 100);
}
}
Console.WriteLine("total items {0} after {1} iterations with {2} left in queue", d.Count, t, keys.Count);
_log.Debug(capture.Substring(0, 10));
}
}