Re: [jetty-users] Load testing slowness

[Jeff Segal <jeffrey.segal@xxxxxxxxx>]

Yes, they all seem to be waiting on the same lock. Here's a snippet of one of those threads:

"qtp1870207216-62" prio=10 tid=0x00007fa36030f800 nid=0x791c waiting for monitor entry [0x00007fa34a6e9000]

   java.lang.Thread.State: BLOCKED (on object monitor)

        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:568)

        - waiting to lock <0x0000000780398e50> (a org.eclipse.jetty.servlet.ServletHolder)

        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1367)

        at org.eclipse.jetty.servlets.CrossOriginFilter.handle(CrossOriginFilter.java:212)

        at org.eclipse.jetty.servlets.CrossOriginFilter.doFilter(CrossOriginFilter.java:179)

        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)

        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)

On Wed, Dec 19, 2012 at 12:23 PM, Simone Bordet <sbordet@xxxxxxxxxxx> wrote:

Hi,

On Wed, Dec 19, 2012 at 3:46 PM, Jeff Segal <jeffrey.segal@xxxxxxxxx> wrote:
> I am load testing a Cometd app deployed to Jetty 8.1.3.v20120416. What I
> find occasionally, but not always, is that the handshake process is
> extremely slow (~15-20s per client instead of 100ms).
>
> Looking at a thread dump, I see that the vast majority of QTP threads in the
> following state:
>
> "qtp1870207216-70" prio=10 tid=0x00007fa35419b800 nid=0x7924 waiting for
> monitor entry [0x00007fa349fe2000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
>         at
> org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:568)
>         - waiting to lock <0x0000000780398e50> (a
> org.eclipse.jetty.servlet.ServletHolder)

From the stack trace dump, you should find a stack trace that says
something like:

"locked <0x0000000780398e50>"

What is that thread doing ?

All threads are blocked waiting for the same lock ?

Simon
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