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IDS Forum

Re: Mutex - guard ?

Posted By: Fernando Nunes
Date: Monday, 8 September 2014, at 2:07 p.m.

In Response To: Re: Mutex - guard ? (Cesar Martins)

Forget.... it doesn't have an index on sid (in any case, "indexes" on SMI
"tables" are a complex matter by itself)
The only "index" on this pseudo-table is on net_id... If you happen to
access sysnetworkio on sysdbopen you could save that in a global variable
and use that on sysbdclose().
That would minimize the issue, but by no chance would it solve the
bottleneck...
Regards.

On Mon, Sep 8, 2014 at 6:58 PM, Fernando Nunes <domusonline@gmail.com>
wrote:

> But don't you use SID in your queries? Or even so, the server reads all
> the rows in sysnetworkio?
>
> On Mon, Sep 8, 2014 at 6:52 PM, Cesar Martins <
> cesar.inacio.martins@gmail.com> wrote:
>
>> 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
>>
>>
>>
>> *******************************************************************************
>> 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...
>

--
Fernando Nunes
Portugal

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

--047d7bd74a260ff6a2050291b127

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