[concurrency-interest] tools for parallel performance debugging

Jamie Allen jallen at chariotsolutions.com
Mon Sep 12 13:27:46 EDT 2011


Isn't VTune also Windows and Linux only?  No OSX support, IIRC.



On Sep 12, 2011, at 12:39 PM, Peter Veentjer <alarmnummer at gmail.com> wrote:

> You might have a look at Intel VTune 9.0. It is able to do performance analysis on a very low level (based on cpu feedback) on machine instructions, and it also is able to connect this information back to bytecode/java-code.
> 
> So you can exactly see in your Java application what is happening on a very low level.
> 
> Unfortunately Intel VTune XE doesn't have support anymore for Java.
> 
> And interpreting the information is a expertise in itself.
> 
> And.. you need an Intel (and not even all cpu's) box for it too work. Getting it installed also can be very challenging.
> 
> 
> On Fri, Sep 2, 2011 at 8:55 AM, Mohan Radhakrishnan <mohanr at fss.co.in> wrote:
> Hi,
>      I found this link http://hpctoolkit.org/ from some older references in this forum.
> 
> 
> Thanks,
> Mohan
> 
> -----Original Message-----
> From: concurrency-interest-bounces at cs.oswego.edu [mailto:concurrency-interest-bounces at cs.oswego.edu] On Behalf Of Danny Dig
> Sent: Tuesday, August 30, 2011 12:28 AM
> To: Concurrency; Nathan Reynolds
> Subject: Re: [concurrency-interest] tools for parallel performance debugging
> 
> Thanks Nathan. These tools are all good suggestions. I am curious what
> other tools do people on this mailing list use for parallel
> programming in Java.
> 
> best,
> Danny
> 
> 
> On Thu, Aug 25, 2011 at 11:01 AM, Nathan Reynolds
> <nathan.reynolds at oracle.com> wrote:
> > For identifying threading correctness issues, I recommend using Java Path
> > Finder (http://babelfish.arc.nasa.gov/trac/jpf).  It executes every possible
> > thread scheduling combination.  It does so by trying one thread scheduling
> > combination and then back tracking (i.e. revert the state of the program) to
> > simulate other combinations.  If there is a data race or deadlock, it will
> > find it and report it.  It doesn't just tell you that a data race or
> > deadlock exists but the steps that got to that state.  Because of the number
> > of combinations, it is best to run it on a small piece of the overall
> > program.
> >
> > As for synchronization contention, there are several tools available.
> > Looking through a dump of call stacks and seeing where the most threads are
> > blocked works for cases where the lock is dropping the throughput by 10% or
> > more.  The call stacks are easy to obtain but can be time consuming to sift
> > through.  JRockit's Mission Control can tell you exactly which locks are
> > most contended and give you the call stacks of where that lock is used.  I
> > am pretty sure most of the profilers can tell you which locks are most
> > contended, but since JRockit's Mission Control is free for me I haven't
> > looked at the profilers for a while.  I thought that JConsole or some tool
> > in the JDK could tell you the most contended lock... but I am really not
> > sure of that.
> >
> > As for false sharing, this is something that only the processor can tell
> > you.  For Intel, I *think* VTune can tell you about false sharing.  I know
> > that VTune can deal with Java optimized code.
> >
> > Nathan Reynolds | Consulting Member of Technical Staff | 602.333.9091
> > Oracle PSR Engineering | Server Technology
> > On 8/24/2011 8:07 PM, Danny Dig wrote:
> >
> > This community has been providing some great library features for
> > taming parallelism in Java.
> >
> > When it comes to tools for parallel performance debugging, it looks to
> > me that Java is trailing behind C++/Intel's ParallelStudio, or
> > C#/Microsoft's Visual Studio. When working with Java programs, what
> > are the tools that you recommend for:
> > - identifying threading correctness issues (e.g., data-races, deadlocks),
> > - identifying performance issues (load imbalance, synchronization
> > contention, false sharing)
> >
> > best,
> > Danny
> >
> >
> 
> 
> 
> --
> Danny Dig
> Visiting Research Assistant Professor at UIUC
> 
> http://netfiles.uiuc.edu/dig/www
> 
> Motto: "Success is not for the chosen few but for the few who choose"
> 
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