Can you double check that you're interpreting the profiler data correctly
(specifically with respect to where threads are spending time versus where they are using CPU)?

The spot you pointed out *should* show up as a place where threads spend lots of time,
as these threads just sit waiting in the read calls for the vast majority of their life.

But it should *not* be a CPU hotspot -- these threads should be idle during that time.

-Dennis

On 06/11/2014 03:52 AM, Gustavo Fernandes wrote:
Hi,

While investigating some CI failures in query (timeouts), I've narrowed down the issue to the Jgroups protocol stack being used.
Running a 'mvn clean install' in the query/ module takes about 6min (when timeout does not happen). If I run instead:

mvn -Dtest.protocol.jgroups=udp clean install

Time goes down to around 50s. Recent changes in core's jgoups-tcp.xml for the tests were the removal of the loopback=true and the modification of the bundler_type, but they don't seem to affect the outcome.

FYI, taking a single test and stripping down from it everything but the cluster formation and data population (5 objects) leads to the cpu hotspot below, and it takes almost 1 minute 

I'd be happy to change the query tests to udp, but first would like to hear your thoughts about this issue

Gustavo

+----------------------------------------------------------------------------------+------------------+--------------------+
|                                       Name                                       |    Time (ms)     |  Invocation Count  |
+----------------------------------------------------------------------------------+------------------+--------------------+
|  +---java.net.SocketInputStream.read(byte[], int, int, int)                      |  101,742  100 %  |             4,564  |
|    |                                                                             |                  |                    |
|    +---java.net.SocketInputStream.read(byte[], int, int)                         |                  |                    |
|      |                                                                           |                  |                    |
|      +---java.io.BufferedInputStream.fill()                                      |                  |                    |
|        |                                                                         |                  |                    |
|        +---java.io.BufferedInputStream.read()                                    |                  |                    |
|          |                                                                       |                  |                    |
|          +---java.io.DataInputStream.readInt()                                   |                  |                    |
|            |                                                                     |                  |                    |
|            +---org.jgroups.blocks.TCPConnectionMap$TCPConnection$Receiver.run()  |                  |                    |
|              |                                                                   |                  |                    |
|              +---java.lang.Thread.run()                                          |                  |                    |
+----------------------------------------------------------------------------------+------------------+--------------------+




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