If I remember correctly, NHibernate's 1st-level cache is tied to the
session factory (eg. lives beyond disposal of individual sessions)... and
is shared across all session instances allocated from the factory. This
means that as your application runs, data will accumulate in this cache. It
will look like a leak, and depending on your perspective, could be
considered one except that the 1st level cache is intentional.
I'm not sure what the answer to the "Why now?" question would be, but
perhaps recent versions of NHibernate more aggressively lean on the
1st-level cache?
Hopefully this helps,
Tyler
On Tuesday, April 19, 2016 at 8:14:19 AM UTC-7, Vincent Decrauzat wrote:
>
> We are using NHibernate in different products since years and without any
> problem.
> Recently, we are facing a memory leak issue in some new sites.
> Investigating with a profiler, we have found that the problem is
> NHibernate sessions that are not garbage collected.
> This is really strange as all our interactions with NHibernate are
> following this pattern:
>
> using(ISession session = nhibernateHelper.OpenSession())
> {
> // Read or write data...
> }
>
> The helper is just a singleton that has a private session factory
> initialized at startup.
>
> It must be somehow related to the environment, because exactly the same
> binaries with exactly the same database are leaking on a machine but not on
> another one.
>
> We have tried with different versions of .NET (4.5.2 and 4.6.1), no change
> We have tried with software in debug or release. It leaks faster on debug,
> but it leaks in both configurations.
>
> Our database is postgres 9.4
> We are running on a Windows 2012 R2 server.
> The software is running as a Windows service, it has <gcServer
> enabled="true" /> in its app.config.
>
> What could be the cause for such memory leak ?
> Has anybody also experienced such problems ?
>
>
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