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IDS Forum

Re: Mutex - guard ?

Posted By: Cesar Martins
Date: Monday, 8 September 2014, at 1:52 p.m.

In Response To: Re: Mutex - guard ? (Fernando Nunes)

Hi Fernando,

The mostly important for me into sysnetworkio is get how much I/O occur
(bytes) .
With it I able to collect the overhead of network for each application
(4GL) , identify the application and then start a investigation over it ,
why have high network I/O and what can be improved .

This way I already detected applications which run for 2 hours and
transfers lots of GBytes with database... and frequently the reason of this
is the easy way to program into 4GL writing embedded SQL creating a huge
overhead for repeated SQLs and the bad behave of the programmer to fetch
data copying the SQL for an information which the program already get few
lines before into the code.
But sometimes is just a bad filter which able to user print a report with
all data of the database and tons of paper pages...

I save all statistics of all access of our database and I already have 3
years of historical. This already help me to identify why a program becomes
slow from certain date where I able to see , before X date they consumption
of CPU, Disk and Network have a differ behave....

I've adapted the core of our 4GL system to run procedures into the database
to identify it self , saving the name of program and what function into
global variables of the session at critical points of the code and
sysdbclose . This way I know exactly which code is running with that
statistics....

2014-09-08 14:35 GMT-03:00 Fernando Nunes <domusonline@gmail.com>:

> 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
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--047d7bdc9e282316130502917c95

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