Michael Heemskerk created SSHD-253:
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Summary: Improve performance of auth and idle timeout checking
Key: SSHD-253
URL: https://issues.apache.org/jira/browse/SSHD-253
Project: MINA SSHD
Issue Type: Improvement
Reporter: Michael Heemskerk
Priority: Minor
SshServer performs auth and idle timeout checks by scheduling a Runnable to
disconnect the session when the timeout occurs. Every time new data is
received, the task is canceled and a new Runnable is scheduled.
As a result ScheduledExecutorService.schedule is called very frequently and
pops up in the profiling hotspots. I've created an alternative implementation
that uses a single thread to periodically checks (once every second) all active
sessions whether they've timed out.
The performance impact of this change depends on the type of SSH usage. For
operations that transfer a lot of data in a short time, the improvement is
significant (about 8% in my test).
I'll open a PR on github shortly
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