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IDS Forum

Re: why so many informix threads on idle systems ?

Posted By: Madison Pruet
Date: Tuesday, 6 April 2010, at 8:29 p.m.

In Response To: Re: why so many informix threads on idle systems ? (KARL OLIVER)

Each of the threads have a special purpose. Since the system is idle,
there are no 'sqlexec' threads. Those are the 'user' threads and are
responsible for the actual query. The ER threads are event driven and =
are
driven when other things happen, possibly from a log being written or m=
aybe
in response to having received a replicated transaction. Since you are=

using ER, I'll give a break down on what each of those threads are
responsible for and what causes them to go into an active state. Notic=
e
that the threads in this example are all in a waiting/sleeping state.

Just to explain a couple of other things. There are two main waiting
states for the threads. The 'sleeping' state and the cond wait state. =
The
sleeping state is normally used when we want to always wake up every so=

often just to see what's going on. If a thread is sleeping, that doesn=
't
mean that some other thread can't wake it up immediately. The conditio=
n
wait is a bit different because there no 'timeout' and thus the thread =
will
only be activated when some other thread activates it.

We could respawn these threads, but the cost of the thread setup is a b=
it
high because of all of the internal querying against the queues and oth=
er
tables within the syscdr database. That's the reason that we just keep=
the
threads but place them in a sleep/waiting state when they don't have wo=
rk
to do.

OK - here goes.

|------------------------+------------------------+--------------------=
----|
|Thread |Purpose |When activated =

|
|------------------------+------------------------+--------------------=
----|
|CDRD_### |ER apply thread |When a replicated =

|
| | |transaction is recei=
ved.|
|------------------------+------------------------+--------------------=
----|
|CDRACK_### |ER ACK threads - process|When an ACK is recei=
ved |
| |ACKS from transactions | =

|
| |applied on other servers| =

|
| |within the ER domain | =

|
|------------------------+------------------------+--------------------=
----|
|CDRM_Monitor |ER Monitor thread - |One a second =

|
| |monitors and adjusts ER | =

|
| |apply parallelism | =

|
|------------------------+------------------------+--------------------=
----|
|CDRNr19 |ER Network Receive |When a new message i=
s |
| |Thread connected to node|received from ER nod=
e 19|
| |19 | =

|
|------------------------+------------------------+--------------------=
----|
|CDRRTBCleaner |Cleans up ER objects no |Every few minutes or=
so |
| |longer in use | =

|
|------------------------+------------------------+--------------------=
----|
|ddr_snoopy |Receives the log records|When a log buffer is=

|
| | |flushed =

|
|------------------------+------------------------+--------------------=
----|
|CDRNsT19 |ER Network Send Thread |When a message needs=
to |
| |connected to node 19 |be sent to node 19 =

|
|------------------------+------------------------+--------------------=
----|
|CDRGeval### |Grouper Evaluator |As new log records a=
re |
| |threads - evaluates and |received =

|
| |regroups log records for| =

|
| |replication | =

|
|------------------------+------------------------+--------------------=
----|
|CDRGfan |Grouper Fanout thread - |As new log records a=
re |
| |acts as a distributor |received =

|
| |between the snoopy and | =

|
| |evaluator threads. Also | =

|
| |has special logic for | =

|
| |begin work/commit | =

|
| |work/rollback... | =

|
|------------------------+------------------------+--------------------=
----|
|CDRCparse |ER statement cache |Only as a replicate =
is |
| |manager |created/removed =

|
|------------------------+------------------------+--------------------=
----|
|CDRDTCleaner |Delete Table Cleaner - |Every 5 minutes or s=
o |
| |prunes the delete shadow| =

|
| |tables | =

|
|------------------------+------------------------+--------------------=
----|
|CDRSchedMgr |ER Scheduler - fires |As needed =

|
| |retry connection | =

|
| |attempts, timed based | =

|
| |replication, etc | =

|
|------------------------+------------------------+--------------------=
----|

=

From: "KARL OLIVER" <karl.oliver@maf.govt.nz> =

=

To: ids@iiug.org =

=

Date: 04/06/2010 06:59 PM =

=

Subject: Re: why so many informix threads on idle systems ? [1951=
1]

=

Sent by: ids-bounces@iiug.org =

=

here is the onstat -g ath

BM Informix Dynamic Server Version 11.10.FC3 -- On-Line -- Up 01:09:50 =
--
123912 Kbytes

Threads:
tid tcb rstcb prty status vp-class name
2 c0000000ae5ca9a8 0 1 IO Idle 3lio* lio vp 0
3 c0000000ae5ebc88 0 1 IO Idle 4pio* pio vp 0
4 c0000000ae60d450 0 1 IO Idle 5aio* aio vp 0
5 c0000000ae60cc88 0 1 IO Idle 6msc* msc vp 0
6 c0000000ae62ec88 0 1 IO Idle 7adt* adt vp 0
7 c0000000ae681450 0 1 IO Idle 8aio* aio vp 1
8 c0000000ae65fc88 c0000000adafc028 3 sleeping secs: 1 1cpu main_loop()=

9 c0000000ae6c58a0 0 1 running 9soc* soctcppoll
10 c0000000ae6e2c60 0 2 sleeping forever 1cpu* soctcplst
11 c0000000ae70c418 0 2 sleeping forever 1cpu* soctcplst
12 c0000000ae70ccd8 c0000000adafc840 1 sleeping secs: 1 1cpu flush_sub(=
0)
13 c0000000ae751028 c0000000adafd058 1 sleeping secs: 1 1cpu flush_sub(=
1)
14 c0000000ae771220 c0000000adafd870 2 sleeping secs: 1 1cpu aslogflush=

15 c0000000ae815028 c0000000adafe088 1 sleeping secs: 88 1cpu btscanner=
_0
26 c0000000aea3d9b8 c0000000adaff8d0 3 sleeping secs: 1 1cpu* onmode_mo=
n
31 c0000000ae87c220 c0000000adb01118 1 cond wait bp_cond 1cpu bf_priosw=
eep
()
32 c0000000aea920d0 c0000000adb00900 1 sleeping secs: 30 1cpu CDRSchedM=
gr
34 c0000000aead9028 c0000000adb02148 1 sleeping secs: 92 1cpu CDRDTClea=
ner
35 c0000000aead9518 c0000000adb02960 1 cond wait CDRCparse 1cpu CDRCpar=
se
37 c0000000aeb64028 c0000000adb03990 1 sleeping secs: 165 1cpu* dbSched=
uler

38 c0000000aed3a4c0 c0000000adb000e8 1 sleeping forever 1cpu* dbWorker1=

39 c0000000aed4a028 c0000000adb03178 1 sleeping forever 1cpu* dbWorker2=

40 c0000000aec04b60 c0000000adb041a8 3 sleeping secs: 1 1cpu CDRGfan
41 c0000000aec4e760 c0000000adb049c0 3 sleeping secs: 2 1cpu CDRGeval0
42 c0000000aec4eca0 c0000000adb051d8 3 sleeping secs: 2 1cpu CDRGeval1
43 c0000000aec91220 c0000000adb059f0 3 sleeping secs: 2 1cpu CDRGeval2
44 c0000000aeb38220 c0000000adb06208 1 sleeping secs: 30 1cpu CDRNsT19
45 c0000000aeb38b78 c0000000adb06a20 2 sleeping secs: 1 1cpu ddr_snoopy=

46 c0000000ae85c028 c0000000adb07238 1 sleeping secs: 30 1cpu CDRRTBCle=
aner

47 c0000000aea3dc08 c0000000adaff0b8 1 cond wait netnorm 1cpu CDRNr19
48 c0000000ae85c7d0 c0000000adb07a50 1 sleeping secs: 1 1cpu CDRM_Monit=
or
49 c0000000ae85ca20 c0000000adb08268 1 cond wait CDRAckslp 1cpu CDRACK_=
0
50 c0000000ae85cc70 c0000000adb08a80 1 cond wait CDRAckslp 1cpu CDRACK_=
1
51 c0000000ae8a0028 c0000000adb09298 1 cond wait CDRDssleep 1cpu CDRD_1=

***********************************************************************=
********

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