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IDS Forum

Re: spin locks

Posted By: John Miller iii
Date: Monday, 23 September 2013, at 5:52 p.m.

In Response To: Re: spin locks (david@smooth1.co.uk)

The two mutex which are directly effected are sh_stamp and po_lock, but
the VP_MEMORY_CACHE_KB speeds up malloc()/free() functionality
which can have an indirect impact on many things.
Setting this to a value of 1024 (i.e. 1MB) can have a great impact. If
you are not worried about
a few MB then setting this to 4096 would be my starting point.
Two additional notes,
1) The functionality of this has been improved so please look at the
setting
in new releases.
2) This feature is only available with the enterprises edition
John F. Miller III
STSM, Lead Architect
miller3@us.ibm.com
ids-bounces@iiug.org wrote on 09/23/2013 12:44:56 PM:
> From: "david@smooth1.co.uk" <david@smooth1.co.uk>
> To: ids@iiug.org,
> Date: 09/23/2013 12:45 PM
> Subject: Re: spin locks [31483]
> Sent by: ids-bounces@iiug.org
>
> Can you go over what some of the other ones are and which ones are
> affected by
> VP_MEMORY_CACHE_KB?
>
> Also what values for VP_MEMORY_CACHE_KB do people use?
>
> David.
>
> On 23 September 2013 at 18:47 John Miller iii <miller3@us.ibm.com> wrote:
> > The output of onstat -g spi is so low, it is really not even worth
> > worrying about. The po_pool lock
> > is the hottest mutex which has 118 latch waits in over 9 hours. This
means
> > you are averaging 1 wait
> > every 4.5 minutes and only spins 521 times before it acquires the
mutex. I
> > generally do not even look
> > at mutex with less than 1000 spins per acquisition.
> >
> > This is the lock on the global memory pool which often deals with
config,
> > gls,
> > network, and general overhead items which are not owned by a user.
> >
> > Hope it helps,
> >
> > John F. Miller III
> > STSM, Lead Architect
> > miller3@us.ibm.com
> > 503-747-1366
> > IBM Informix Dynamic Server (IDS)
> >
> > ids-bounces@iiug.org wrote on 09/23/2013 09:04:07 AM:
> >
> > > From: "Art Kagel" <art.kagel@gmail.com>
> > > To: ids@iiug.org,
> > > Date: 09/23/2013 10:08 AM
> > > Subject: Re: spin locks [31481]
> > > Sent by: ids-bounces@iiug.org
> > >
> > > That's true. I missed the "IE" in the version string.
> > >
> > > Art
> > >
> > > Art S. Kagel, Principal Consultant
> > >
> > > Advanced DataTools (www.advancedatatools.com)
> > > Blog: http://informix-myview.blogspot.com/
> > >
> > > Disclaimer: Please keep in mind that my own opinions are my own
opinions
> > > and do not reflect on my employer, Advanced DataTools, the IIUG, nor
any
> > > other organization with which I am associated either explicitly,
> > > implicitly, or by inference. 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, Sep 23, 2013 at 3:02 AM, Hrvoje Zokovic
> > > <hzokovic.iiug@gmail.com>wrote:
> > >
> > > > According to 12.10.TC1IE i think this is innovator-C edition and
you
> > can
> > > > not use CPU VP memory
> > > > cache on this edition (it is Enterprise/Ultimate only feature)
> > > > HTH
> > > > Hrvoje
> > > >
> > > > On 22.9.2013. 3:20, Art Kagel wrote:
> > > > > IB that is the memory pool latch. You can probably reduce the
> > activity on
> > > > > it by enabling VP_MEMORY_CACHE_KB so that each CPU VP holds on to
> > some of
> > > > > the memory from the central pool and so has to interact withthe
pool
> >
> > > > latch
> > > > > less frequently.
> > > > >
> > > > > Art
> > > > >
> > > > > Art S. Kagel, Principal Consultant
> > > > >
> > > > > Advanced DataTools (www.advancedatatools.com)
> > > > > Blog: http://informix-myview.blogspot.com/
> > > > >
> > > > > Disclaimer: Please keep in mind that my own opinions are my own
> > opinions
> > > > > and do not reflect on my employer, Advanced DataTools, the IIUG,
nor
> > any
> > > > > other organization with which I am associated either explicitly,
> > > > > implicitly, or by inference. 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 Fri, Sep 20, 2013 at 4:56 PM, BillHatVerizon
> > > > <garage_dba@verizon.net>wrote:
> > > > >
> > > > >> This is the output of onstat g spi .
> > > > >> What is po_lock below?
> > > > >> Do the numbers look high or is it not possible to answer without
> > more
> > > > info
> > > > >> ?
> > > > >> This is on Windows server 2008 R2 SP1.
> > > > >>
> > > > >> IBM Informix Dynamic Server Version 12.10.TC1IE -- On-Line -- Up
> > > > 09:04:41
> > > > >> --
> > > > >> 733952 Kbytes
> > > > >>
> > > > >> Spin locks with waits:
> > > > >> Num Waits Num Loops Avg Loop/Wait Name
> > > > >> 1 88 88.00 mutex lock, name = AIOreq
> > > > >> 2 31 15.50 mutex lock, name = AIOreq
> > > > >> 1 1 1.00 mutex lock, name = AIOreq
> > > > >> 1 1 1.00 mutex lock, name = AIOreq
> > > > >> 1 121 121.00 mutex lock, name = AIOreq
> > > > >> 1 102 102.00 mutex lock, name = AIOreq
> > > > >> 1 38 38.00 mutex lock, name = AIOreq
> > > > >> 1 1 1.00 mutex lock, name = AIOreq
> > > > >> 1 1 1.00 mutex lock, name = AIOreq
> > > > >> 1 110 110.00 mutex lock, name = AIOreq
> > > > >> 1 155 155.00 mutex lock, name = AIOreq
> > > > >> 1 203 203.00 mutex lock, name = AIOreq
> > > > >> 1 1 1.00 mutex lock, name = AIOreq
> > > > >> 1 28 28.00 mutex lock, name = AIOreq
> > > > >> 2 102 51.00 mutex lock, name = AIOreq
> > > > >> 1 14 14.00 mutex lock, name = AIOreq
> > > > >> 1 80 80.00 mutex lock, name = AIOreq
> > > > >> 2 63 31.50 mutex lock, name = AIOreq
> > > > >> 1 1 1.00 mutex lock, name = AIOreq
> > > > >> 1 68 68.00 mutex lock, name = AIOreq
> > > > >> 1 116 116.00 mutex lock, name = AIOreq
> > > > >> 1 19 19.00 mutex lock, name = AIOreq
> > > > >> 1 160 160.00 mutex lock, name = AIOreq
> > > > >> 1 1 1.00 mutex lock, name = AIOreq
> > > > >> 1 170 170.00 mutex lock, name = AIOreq
> > > > >> 1 48 48.00 mutex lock, name = AIOreq
> > > > >> 1 24 24.00 mutex lock, name = AIOreq
> > > > >> 1 68 68.00 mutex lock, name = AIOreq
> > > > >> 2 134 67.00 mutex lock, name = AIOreq
> > > > >> 2 183 91.50 mutex lock, name = AIOreq
> > > > >> 1 49 49.00 mutex lock, name = AIOreq
> > > > >> 3 284 94.67 mutex lock, name = AIOreq
> > > > >> 1 6 6.00 mutex lock, name = AIOreq
> > > > >> 1 58 58.00 mutex lock, name = AIOreq
> > > > >> 1 1 1.00 mutex lock, name = AIOreq
> > > > >> 2 135 67.50 mutex lock, name = AIOreq
> > > > >> 2 49 24.50 mutex lock, name = AIOreq
> > > > >> 1 61 61.00 mutex lock, name = AIOreq
> > > > >> 1 10 10.00 mutex lock, name = AIOreq
> > > > >> 4 759 189.75 shmcb sh_lock
> > > > >> 118 60205 510.21 pool po_lock, name = global
> > > > >>
> > > > >>
> > > > >>
> > > > >>
> > > > >
> > > >
> > > >
> > >
> >
> >
>
*******************************************************************************
> >
> > > > >> Forum Note: Use "Reply" to post a response in the discussion
forum.
> > > > >>
> > > > >>
> > > > > --001a113366bc05dd7b04e6eeb4df
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> >
> >
>
*******************************************************************************
> >
> > > > > Forum Note: Use "Reply" to post a response in the discussion
forum.
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
>
*******************************************************************************
> >
> > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > >
> > > >
> > >
> > > --001a11c36cde42dc0e04e70f10c2
> > >
> > >
> > >
> >
> >
>
*******************************************************************************
> >
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> >
> >
> >
>
*******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
>
>
>
*******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

Messages In This Thread

spin locks
BillHatVerizon -- Friday, 20 September 2013, at 4:56 p.m.
- Re: spin locks
  Marco Greco -- Saturday, 21 September 2013, at 6:00 a.m.
  - Re: spin locks
    david@smooth1.co.uk -- Thursday, 28 August 2014, at 6:20 a.m.
- Re: spin locks
  Art Kagel -- Saturday, 21 September 2013, at 9:20 p.m.
  - Re: spin locks
    Hrvoje Zokovic -- Monday, 23 September 2013, at 3:02 a.m.
    - Re: spin locks
      Art Kagel -- Monday, 23 September 2013, at 12:04 p.m.
      - Re: spin locks
        John Miller iii -- Monday, 23 September 2013, at 1:47 p.m.
        
        Re: spin locks
        david@smooth1.co.uk -- Monday, 23 September 2013, at 3:44 p.m.
        
        Re: spin locks
        John Miller iii -- Monday, 23 September 2013, at 5:52 p.m.
        
        Re: spin locks
        david@smooth1.co.uk -- Thursday, 28 August 2014, at 6:22 a.m.
        
        Re: spin locks
        Art Kagel -- Monday, 23 September 2013, at 9:23 p.m.
        
        Re: spin locks
        david@smooth1.co.uk -- Thursday, 28 August 2014, at 6:21 a.m.
      - Re: spin locks
        BillHatVerizon -- Monday, 23 September 2013, at 5:50 p.m.
  - Re: spin locks
    david@smooth1.co.uk -- Thursday, 28 August 2014, at 6:21 a.m.

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