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IDS Forum

Re: Mutex - guard ?

Posted By: Fernando Nunes
Date: Monday, 8 September 2014, at 1:35 p.m.

In Response To: Re: Mutex - guard ? (Marco Greco)

This is sysnetworkio:

create table sysnetworkio

(

net_id int, { Net
ID }

sid int, { session
id }

net_netscb int8, { address of
netscb }

net_client_type int, { client
type }

net_client_name char(12), { client protocal
name }

net_read_cnt int8, { number of read
operations }

net_read_bytes int8, { # of bytes txfr to
server }

net_write_cnt int8, { number of write
operations }

net_write_bytes int8, { # of bytes txfr to
client }

net_open_time int, { time connection was
made }

net_last_read int, { time of last network
read }

net_last_write int, { time of last network
write }

net_state int, { state of network
connection }

net_options int, { sqlhost
options }

net_prot_id int, { id for protocal
name }

net_protocol char(10), { prtocal
name }

net_server_fd int, { poll server
fd }

net_poll_thread int { poll thread
id }

);

I understand the need for this to monitor idle sessions for example.
Other than that I think the net_client_name or maybe net_protocol can be
interesting in an open/close context...
But what is the purpose of this sysdbopen()/sysdbclose()? And why would you
need to read rows from it besides the one for your own session?

Regards.

On Mon, Sep 8, 2014 at 6:05 PM, Marco Greco <marco@4glworks.com> wrote:

> On 08/09/14 15:05, Cesar Martins wrote:
> > Hi David ,
> >
> > I've checked my history of emails and this is what I have :
> >
> > - There is no FIX , only a suggestion for workaround.
> >
> > - The problem occur with exclusive with Power7 processors using SMT-4
> >
> > configuration
> >
> > What they was explained , this is because of internal architecture of P7
> >
> > in SMT-4 configuration.
> >
> > - workaround suggested (from IBM Support) , change the LPAR proc SMT-4
> >
> > to SMT-2
> >
> > - The ontat -g stk bellow
> >
> > - This is into version 11.50 FC9X6 , AIX 6.1
> >
> > stack for thread: 9063619 sqlexec
> > base: 0x0700001cdecb7000
> > len: 266240
> >
> > pc: 0x000000010003618c
> > tos: 0x0700001cdecf21e0
> > state: mutex wait
> >
> > vp: 49
> >
> > 0x000000010003618c (oninit)yield_processor_mvp
> > 0x0000000100038b6c (oninit)mt_lock_wait
> > 0x0000000100045a2c (oninit)mt_lock
> > 0x0000000100d72958 (oninit)smi_network_io
> > 0x000000010030a0fc (oninit)pstread
> > 0x00000001002f1c00 (oninit)pst_rsread
> > 0x00000001002fafd8 (oninit)rsread
> > 0x00000001004c0c18 (oninit)fmread
> > 0x0000000100668588 (oninit)readseq_single
> > 0x0000000100668cd0 (oninit)gettupl
> > 0x000000010066c488 (oninit)scan_next
> > 0x0000000100d1182c (oninit)next_row
> > 0x0000000100d1151c (oninit)get_first_row_from_producer
> > 0x0000000100d10498 (oninit)hash_process_all_groups
> > 0x0000000100d13f9c (oninit)group_open
> > 0x000000010065f428 (oninit)filltemp
> > 0x000000010066cd40 (oninit)scan_open
> > 0x000000010066dc58 (oninit)materialize_viewtmp
> > 0x000000010066dcdc (oninit)materialize_viewtmp
> > 0x000000010066dcc8 (oninit)materialize_viewtmp
> > 0x000000010066dcc8 (oninit)materialize_viewtmp
> > 0x000000010040be94 (oninit)prepselect
> > 0x000000010067ad80 (oninit)subqprep
> > 0x000000010067b2f4 (oninit)exsubq
> > 0x00000001005953d4 (oninit)geval
> > 0x000000010075f308 (oninit)eval_projection_list
> > 0x00000001007646c8 (oninit)dodmlrow
> > 0x0000000100767254 (oninit)dodelupd
> > 0x000000010041d030 (oninit)aud_dodelupd
> > 0x000000010042593c (oninit)excommand
> > 0x000000010023d4c0 (oninit)ip_evalsql
> > 0x0000000100248f78 (oninit)runproc
> > 0x0000000100243c7c (oninit)udrlm_spl_execute
> > 0x0000000100ce98e4 (oninit)udrlm_exec_routine
> > 0x0000000100581ea4 (oninit)udr_execute
> > 0x00000001005bb768 (oninit)exroutine
> > 0x00000001004240d0 (oninit)execproc
> > 0x0000000100418120 (oninit)aud_execproc
> > 0x0000000100426288 (oninit)excommand
> > 0x000000010023d4c0 (oninit)ip_evalsql
> > 0x0000000100248f78 (oninit)runproc
> > 0x0000000100243c7c (oninit)udrlm_spl_execute
> > 0x0000000100ce98e4 (oninit)udrlm_exec_routine
> > 0x0000000100581ea4 (oninit)udr_execute
> > 0x00000001003d8230 (oninit)exec_sysdbproc
> > 0x0000000100cef16c (oninit)sqscb_cleanup
> > 0x0000000100139a5c (oninit)destroy_session
> > 0x00000001001f9894 (oninit)sqsetconerr
> > 0x0000000100217148 (oninit)asf_recv
> > 0x00000001002184c0 (oninit)_iread
> > 0x000000010021883c (oninit)_igetint
> > 0x000000010022451c (oninit)sqmain
> > 0x000000010037c160 (oninit)listen_verify
> > 0x000000010037a608 (oninit)spawn_thread
> > 0x0000000100dd528c (oninit)startup
> >
>
> Roughly speaking, from your stack: a client disconnected uncleanly, and as
> part of your sysdbclose() you are executing a procedure that is doing an
> update in which there's a subquery which materializes a view which queries
> sysmaster:sysnetworkio, and it's the query on sysnetworkio which is
> waiting on
> the guard mutex, which I guessing is being used to prevent the netscbs from
> changing as your query gets the next record.
>
> If you have lots of sysdbclose querying sysnetworkio that at the same time
> -
> that's your bottleneck.
> Shout at your developer and tell him to never, ever, ever write anything
> like
> that again.
> --
> Ciao,
> Marco
>
> ______________________________________________________________________________
> Marco Greco /UK /IBM Standard disclaimers apply!
>
> Structured Query Scripting Language http://www.4glworks.com/sqsl.htm
> 4glworks http://www.4glworks.com
> Informix on Linux http://www.4glworks.com/ifmxlinux.htm
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Fernando Nunes
Portugal

http://informix-technology.blogspot.com
My email works... but I don't check it frequently...

--047d7bacbe6a009f620502913ec1

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