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IDS Forum

Questions re NUMCPUVPS, PDQPRIORTY, AFF_NPROCS and AFF_SPROC

Posted By:
Date:

Hi,

Not sure if anyone can shed some light on a couple of questions I have about
Dynamic Server and NUMCPUVPS, PDQPRIORTY, AFF_NPROCS and AFF_SPROC ?

Firstly our setup:

We are running a data replication setup (2 systems each running Dynamic
Server 9.21-FC3x-1 on HP-UX 11.0).

The primary server has 6 CPU's and has the following configuration
parameters:

SHMTOTAL 0
SHMADD 96000
MULTIPROCESSOR 1
NUMCPUVPS 6
AFF_SPROC 0
AFF_NPROCS 0
MAX_PDQPRIORITY 100
DS_MAX_QUERIES 1280
DS_TOTAL_MEMORY 163840
DS_MAX_SCANS 1048576

The secondary read-only server has 4 CPU's and has the following
configuration parameters:

SHMTOTAL 0
SHMADD 96000
MULTIPROCESSOR 1
NUMCPUVPS 4
AFF_SPROC 0
AFF_NPROCS 0
MAX_PDQPRIORITY 100
DS_MAX_QUERIES 1280
DS_TOTAL_MEMORY 163840
DS_MAX_SCANS 1048576


We are not using processor affinity. CPU VP's can be serviced/executed by
any of the 6 physical CPU's on the primary server.
We have 900+ users accessing the primary server and we don't appear to have
many issues - things seem to run quite well (although I am sure
someone out there could tune the system a little more !).

We are not implementing Kernel AIO, and all chunks are RAW.


Question 1: Based on real-world experience, can anyone let me know how to
decide what the NUMCPUVPS should be set at ?

We currently have NUMCPUVPS = # Physical CPU's......and I repeat there do
not seem to be any issues.

I have read many articles on setting the NUMCPUVP parameter for various
versions of Dynamic Server from 7.21 to 9.21 and these articles have
mentioned:

a) NUMCPUVPS should be set equal to the # of physical CPU's, or

b) NUMCPUVPS should be set to 1 less than the # of physical CPU's, or

c) NUMCPUVPS can be set to > than the # of physical CPU's (for older
versions of Dynamic Server on HP-UX 10.2 that had bugs with using the
NOAGE, AFF_NPROCS and AFF_SPROC parameters).



Question 2: How do we determine when the engine determines a query uses PDQ
and when it doesn't ?

a) When we execute the following SQL script and display stats for the
memory grant manager using "onstat -g mgm | more", we see that engine
does NOT appear to be using PDQ:

set isolation to dirty read;
set pdqpriority 60;
select
sum(f.original_loan_amt)
from table_name_1 a,
table_name_2 b,
table_name_3 c,
table_name_4 f
where
f.credit_appl_id = a.credit_appl_id and
b.credit_appl_id = a.credit_appl_id and
c.operator_code = a.alt_ch_operator_cd and
b.person_id = 1 and
a.alt_ch_branch_num LIKE '032448%';


Details from "onstat -g mgm | more" show:

Informix Dynamic Server 2000 Version 9.21.FC3X1 -- On-Line (Prim) -- Up 15
days 11:10:56 -- 796972 Kbytes

Memory Grant Manager (MGM)
--------------------------

MAX_PDQPRIORITY: 100
DS_MAX_QUERIES: 1280
DS_MAX_SCANS: 1048576
DS_TOTAL_MEMORY: 163840 KB

Queries: Active Ready Maximum
0 0 1280

Memory: Total Free Quantum
(KB) 163840 163840 128

Scans: Total Free Quantum
1048576 1048576 1

Load Control: (Memory) (Scans) (Priority) (Max Queries) (Reinit)
Gate 1 Gate 2 Gate 3 Gate 4 Gate 5
(Queue Length) 0 0 0 0 0

Active Queries: None

Ready Queries: None

Free Resource Average # Minimum #
-------------- --------------- ---------
Memory 11946.7 +- 10067.9 0
Scans 1048575.0 +- 0.0 1048575

Queries Average # Maximum # Total #
-------------- --------------- --------- -------
Active 1.0 +- 0.0 1 6
Ready 0.0 +- 0.0 0 0

Resource/Lock Cycle Prevention count: 0


b) However, when we modify the above SQL script to:

set isolation to dirty read;
set pdqpriority 60;
select
f.credit_appl_id
from
table_name_1 a,
table_name_2 b,
table_name_3 c,
table_name_4 f

where
f.credit_appl_id = a.credit_appl_id
and b.credit_appl_id = a.credit_appl_id
and c.operator_code = a.alt_ch_operator_cd
and b.person_id = 1;


Then re-execute it and check using "onstat -g mgm | more" we see the engine
is using PDQ:

Informix Dynamic Server 2000 Version 9.21.FC3X1 -- On-Line (Prim) -- Up 15
days 11:18:40 -- 796972 Kbytes

Memory Grant Manager (MGM)
--------------------------

MAX_PDQPRIORITY: 100
DS_MAX_QUERIES: 1280
DS_MAX_SCANS: 1048576
DS_TOTAL_MEMORY: 163840 KB

Queries: Active Ready Maximum
1 0 1280

Memory: Total Free Quantum
(KB) 163840 163840 128

Scans: Total Free Quantum
1048576 1048575 1

Load Control: (Memory) (Scans) (Priority) (Max Queries) (Reinit)
Gate 1 Gate 2 Gate 3 Gate 4 Gate 5
(Queue Length) 0 0 0 0 0

Active Queries:
---------------
Session Query Priority
Thread Memory Scans Gate
79493 c00000001c89cbd0 60
c0000000175096e0 0/0 1/1 -

Ready Queries: None

Free Resource Average # Minimum #
-------------- --------------- ---------
Memory 13165.7 +- 9740.2 0
Scans 1048575.0 +- 0.0 1048575

Queries Average # Maximum # Total #
-------------- --------------- --------- -------
Active 1.0 +- 0.0 1 7
Ready 0.0 +- 0.0 0 0

Resource/Lock Cycle Prevention count: 0



Any help would be great !!!!!

Thanks,

Damion Reeves
Informix Database Administrator
EDS Australia
Adelaide Solution Centre

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