Physical CPU Statistics
Hello, We are using SunOS 5.10 Generic_125100-09 sun4v sparc SUNW, Sun-Fire-T200 machine. That is 6 Core with 4 threads/Core machine on which multiple IDS instances are running and each instance is using separate threads of each core. Is it possible for us to find out that which Physical CPU thread is how much busy? Where is contention occurring and which Physical CPU threads are less busy or free? Is there any way to find out such OS level statistics? Regards, Anees Ahmad
Having performance problems? It is my experience that IDS does not play well on the Sun T-class machines. You need to turn off the hardware threads and treat the machine as a simple 6 core box. Art Art S. Kagel Oninit (www.oninit.com) IIUG Board of Directors (art@iiug.org) Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on my employer, Oninit, the IIUG, nor any other organization with which I am associated either explicitly or implicitly. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves. On Wed, Sep 30, 2009 at 3:59 AM, ANEES AHMAD <aanees@i2cinc.com> wrote: > Hello, > > We are using SunOS 5.10 Generic_125100-09 sun4v sparc SUNW, Sun-Fire-T200 > machine. That is 6 Core with 4 threads/Core machine on which multiple IDS > instances are running and each instance is using separate threads of each > core. > Is it possible for us to find out that which Physical CPU thread is how > much > busy? Where is contention occurring and which Physical CPU threads are less > busy or free? > Is there any way to find out such OS level statistics? > > Regards, > Anees Ahmad > > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > --0023545bdaac74e19d0474d5d417
As far as I know, each thread is seen as a CPU from the OS. So there are 6 x 4 = 24 virtual CPUs. You can get CPU stats using mpstat on Solaris. ANEES AHMAD wrote: > Hello, > > We are using SunOS 5.10 Generic_125100-09 sun4v sparc SUNW, Sun-Fire-T200 > machine. That is 6 Core with 4 threads/Core machine on which multiple IDS > instances are running and each instance is using separate threads of each > core. > Is it possible for us to find out that which Physical CPU thread is how much > busy? Where is contention occurring and which Physical CPU threads are less > busy or free? > Is there any way to find out such OS level statistics? > > Regards, > Anees Ahmad > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > >
NO we are not facing performance issues actually. I just need to collect the stats that how the processoers thread are behaving so that load could be balanced for different instancess. I think that mpstat is a good command to collect such stats. Art, As you mentioned that one should turn off the hardware threads and treat the machine as a simple 6 core box.Can you please let us know that how the hardware threads could be turned off ???
I'm no Sun expert, but I know that it can be done. Some say you can use psradm to disable the individual threads as processors except for the first thread on each core (ie on an 8 thread/core Niagra II processor disable all but 0, 8,, 16, etc.). But I would check with Sun to see if there is a more direct way (IB that there is). The problem is that the hardware threads are designed to efficiently run traditional multi-threaded applications whose many threads perform a small fast task then spend most of their time suspended waiting to coordinate with other threads. IDS's threads, which BTW are NOT OS level threads but use a proprietary IDS threading library, run until they have to block to wait for some engine resource. That means that they run full out for, what to a traditional mult-threaded application would seem like, a very long time before relinquishing the processor to another thread within the IDS engine. Note they even going from thread to thread, the OS and processors will see a single OS level thread running full out non-stop for days at a time sometimes. This does not work well on the Niagra processors with threading enabled. Art Art S. Kagel Oninit (www.oninit.com) IIUG Board of Directors (art@iiug.org) Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on my employer, Oninit, the IIUG, nor any other organization with which I am associated either explicitly or implicitly. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves. On Mon, Oct 5, 2009 at 2:44 AM, ANEES AHMAD <aanees@i2cinc.com> wrote: > NO we are not facing performance issues actually. I just need to collect > the > stats that how the processoers thread are behaving so that load could be > balanced for different instancess. > I think that mpstat is a good command to collect such stats. > > Art, As you mentioned that one should turn off the hardware threads and > treat > the machine as a simple 6 core box.Can you please let us know that how the > hardware threads could be turned off ??? > > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > --00151747beea86fcf5047530d5a0