Description
Description
When running the sample code on NET Framework 4.7.2 or 4.8.0. You can see items being evicted from the cache as you'd expect.
However, when the same sample code on netcoreapp3.1, net5.0, or net6.0 it does not evict the cache.
Reproduction Steps
var cache = new MemoryCache("a", new NameValueCollection
{
{ "cacheMemoryLimitMegabytes", "1" },
{ "pollingInterval", "00:00:10"}
});
var sum = 0L;
var stopwatch = Stopwatch.StartNew();
while (true)
{
if (stopwatch.Elapsed >= cache.PollingInterval)
{
Console.WriteLine(string.Join("\t", stopwatch.Elapsed.ToString("mm\\:ss"), "should begin to evict"));
}
var toBeCached = new string('a', 81920 * 10);
sum += toBeCached.Length;
if (sum >= cache.CacheMemoryLimit)
{
Console.WriteLine(string.Join("\t", stopwatch.Elapsed.ToString("mm\\:ss"), "over!"));
}
var key = Guid.NewGuid().ToString();
var cacheItemPolicy = new CacheItemPolicy
{
AbsoluteExpiration = DateTimeOffset.Now.Add(TimeSpan.FromHours(1)),
RemovedCallback = arguments => Console.WriteLine(string.Join("\t", stopwatch.Elapsed.ToString("mm\\:ss"), "remove: " + arguments.CacheItem.Key))
};
if (cache.Add(key, toBeCached, cacheItemPolicy))
{
Console.WriteLine(string.Join("\t", stopwatch.Elapsed.ToString("mm\\:ss"), "add: " + key));
}
Thread.Sleep(TimeSpan.FromSeconds(2));
}Expected behavior
It should begin to evict as it does on .NET Framework 4.7.2/4.8.
Actual behavior
It does not evict on; netcoreapp3.1, net5.0, or net6.0
Regression?
Yes, it worked as expected on .NET Framework 4.7.2/4.8.
Known Workarounds
No known workarounds, except we ripped out MemoryCache. We are aware that the documentation does say we should use IMemoryCache, but that is not a 1:1 replacement for us.
Configuration
Which version of .NET is the code running on?
NET Framework 4.7.2 - works
NET Framework 4.8.0 - works
netcoreapp3.1 - broken
net5.0 - broken
net6.0 - broken
What OS and version, and what distro if applicable?
We tested on:-
OS Name: Microsoft Windows 10 Pro
OS Version: 10.0.19043 N/A Build 19043
And
OS Name: Microsoft Windows Server 2019 Standard
OS Version: 10.0.17763 N/A Build 17763
Other information
No response