Serilog flushToDiskInterval doesn't work

[Tabigon]

Reproduction steps:

1. Setup Program.cs like this: `public class Program { public static void Main(string[] args) { IConfigurationBuilder configBuilder = new ConfigurationBuilder(); configBuilder.SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true); IConfiguration config = configBuilder.Build();

        Log.Logger = new LoggerConfiguration()
            .WriteTo.File("Logs/log-{Date}.txt", buffered: true, flushToDiskInterval: TimeSpan.FromSeconds(60))
        .CreateLogger();
   
        CreateWebHostBuilder(args).Build().Run();
    }
   
    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
    WebHost.CreateDefaultBuilder(args)
        .UseSerilog() // Set serilog as the logging provider.
        .UseStartup<Startup>();
   

   }`

2. Get logger via DI in some controller: `private ILogger<SampleDataController> _logger;

    public SampleDataController(ILogger<SampleDataController> logger)
    {
        _logger = logger;
    }`
   

3. Trying to log an event: public IEnumerable<WeatherForecast> WeatherForecasts(int startDateIndex) { _logger.LogInformation("Test message"); return null; }

Expected result: Logs are flushed to disk every minute.

Real result: Logs are flushed right away as log method called

[nblumhardt]

Hi! How are you determining that the flush is immediate? The flushToDiskInterval setting only specifies when an fsync is forced; .NET and Windows/Linux may decide to flush out writes faster than that.