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IDS Forum

Re: Mutex logs on logical log flip

Posted By: Fernando Nunes
Date: Monday, 29 February 2016, at 2:36 p.m.

In Response To: Re: Mutex logs on logical log flip (NEIL TRUBY)

I did take a look at the PMR... The number of CPU VPs was a bit of a
I've seen your other email.... I have some reservations regarding the fact
that T5 has a lot of threads but not as much "internal pieces" so satisfy a
real database process in each of those "threads". But you say you can't
push it very hard without that... did you look at "onstat -g eff"? I'd be
curious to see that, but i think there were some issues with the
calculation on 11.50...

Also, I have the feeling Art shared some thoughs about this in the past....?

Regarding the number of connections... I do understand the
recommendation... But you're on Solaris... and a few years ago after some
deep investigation of some errors I've found some indicators that on
Solaris, and related to the fact it uses TLI instead of sockets, this value
is used to define the number of pending TCP requests on a specific port
(something along these lines).
But I suppose this wouldn't be related to your problem.... I can drop a
note to Markus if I find this relevant.
The only drawback of an high value is a bit more memory consumption that in
an instance like this is most probably irrelevant.

And I don't understand the rational behind the 36 poll threads... if each
can handle 200-300 connections...15 should be a good value...
On a previous situation I also got the feeling that too many poll threads
wouldn't help...

One very important thing.... do you have lots of new connections per second
or not? This is typically THE trigger for the nsf.lock problem.
Also.... do you have a large ready queue when this happens?
Something I've seen for myself in the past was that occasionally the
session holding the mutex got "stuck" in the ready queue if it get's too
The CPU VP configuration may have impact on this. I'm afraid your "oninit"
processes may be strugling for real CPU resources.

As a final note, many years ago, a customer hitting a similar problem got a
fix that basically changed the number of spins a thread would do before
putting itself on hold waiting for a mutex. The argument was that in
certain cases would be better to "waste" a few more CP cycles instead of
going into the ready queue and struggle to "emerge" again.
That would be a possible path... but it's such a sensitive area that I
would not consider it until everything else was completely cleared.

Still regarding the CPU and the "pushing the server hard".... be careful on
how you measure this... it's better to measure the work done, and not the
idle CPU....

Finally, Spokey AFAIK left IBM and is wokring on his own... it's alive in
facebook at least.
Cosmo is still with us. AFAIK still with Informix. You may mention the
previous history to Makus. Maybe he can shced some more light on this.

On Mon, Feb 29, 2016 at 5:35 PM, NEIL TRUBY <> wrote:

> Thanks. We already knew from Marco Greco, ex of IBM, that the handling of
> this
> in 11.70 is vastly imrpoved. This is the last large customer resisting that
> move.
> NETTYPE tlitcp,11,800,NET
> .... are the settings. The server has 32 physical cores each with 8
> threads.
> 232 of these are assigned to this "Container" (ie VM).
> Typically we have 4,500 connections and IBM has suggested reducing the
> number
> of poll threads to 250 per tlitcp connection something like:
> NETTYPE tlitcp,36,250,NET
> VPCLASS cpu,num=230,noage
> (NOAGE needs a Solaris change to work)
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.

Fernando Nunes
My email works... but I don't check it frequently...


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