On 09/02/2014 01:47 PM, Joakim Erdfelt wrote:
Thank you for your response.
You starved the executor / threadpool. Simple enough.
Why do you have such a tiny threadpool to begin with?
The system is running a large number of multithreaded processes, and the
HTTP transport isn't the bottleneck. I've found that increasing the
number of threads (either with the fixedThreadPool or QueuedThreadPool)
that we use for the Jetty Clients starves the other processes in our
system and degrades overall performance.
Our threadpool / executor defaults assume reasonable baselines.
Our defaults:
Executor impl: QueuedThreadPool
max threads: 200
min threads: 8
idle timeout: 60,000 ms
backed by: BlockingArrayQueue
These are practical limits based on what is considered a modern
baseline from 2010.
Suitable for limited devices of the day (such as J2ME, Raspberry Pi,
and Android)
These defaults also perform splendidly for larger systems as well.
Your FixedThreadPool executor is a premature optimization that is
harming you.
I found that the using the QueuedThreadPool defaults solved the deadlock
issue from not creating sockets to the destination (and zero traffic
being sent from the box), however once that was corrected, I found that
the defaults don't work well with our system. Moving back to a
FixedThreadPool (with more threads than used for the
ClientSelectorManager) increased our performance.
If I wanted to change the number of selectors, it looks like I could
call the HttpClientTransportOverHTTP constructor with the number of
selectors, and pass that into the HttpClient constructor.
int numSelectors = 8;
HttpClientTransport transport = HttpClientTransportOverHTTP(numSelectors);
HttpClient httpClient = HttpClient(transport, null);
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