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IDS Forum

IDS Memory leak with tcp connections under high lo

Posted By: Andreas.KUTSCHE@spar.at
Date: Wednesday, 7 November 2007, at 5:48 p.m.

Hello,

does anybody know about a memory leak in the shared memory of IDS10
(FC6, FC7) on HPUX 11.31

whith many network connections (and high load)?

We have a SAP system with IDS10FC7 with about 1400 concurrent sessions
running on HP Superdome HPUX 11.31.

Since the switch to the new Superdome with HPUX 11.31 (faster OS network
stack!? faster hardware) we see an

steady increase (up to a few GB per hour) of global shared memory pool

onstat -g mem|grep global

And

onstat -g afr global shows more and more entries with 'net' (a
few hundreds more every second).

onstat -g ntu shows a similar increase in the alloc/max
counters in the header/summary line.

Anyone seen something like this?

It seems as if the problem is reproducable with simple queries against a
sysmaster tables an a small server - although

in this case the increase of the counters or shared memory is minimal
and would not look very suspectible.

Should the net configuration (NETVPs etc.) be changed?

onconfig follows - yes, it's a really big machine:

ROOTNAME rootdbs # Root dbspace name

ROOTPATH /informix/P91/sapdata/physdev1/data1

# Path for device containing root
dbspace

ROOTOFFSET 16 # Offset of root dbspace into device
(Kbytes)

ROOTSIZE 170000 # Size of root dbspace (Kbytes)

MIRROR 1 # Mirroring flag (Yes = 1, No = 0)

MIRRORPATH /informix/P91/sapdata/physdev2/data3

# Path for device containing mirrored
root

MIRROROFFSET 16 # Offset into mirrored device (Kbytes)

PHYSDBS physdbs # Location (dbspace) of physical log

PHYSFILE 2000000 # Physical log file size (Kbytes)

LOGFILES 2125 # Number of logical log files

LOGSIZE 5000 # initial (!) Logical log size (Kbytes)

MSGPATH /informix/P91/online.x9168.p91.log

# System message log file path

CONSOLE /informix/P91/console.x9168.p91.log

# System console message path

ALARMPROGRAM /home/informix/bin/alarm_event.p91 # Alarm program path

TAPEDEV /dev/null # Tape device path

TAPEBLK 256 # Tape block size (Kbytes)

TAPESIZE 19500000 # Maximum amount of data to put on tape
(Kbytes)

LTAPEDEV /archiv/p91logs/llogs.p91 # Log tape device path

LTAPEBLK 256 # Log tape block size (Kbytes)

LTAPESIZE 19500000 # Max amount of data to put on log tape
(Kbytes)

STAGEBLOB # INFORMIX-OnLine/Optical staging area

SERVERNUM 0 # Unique id corresponding to a OnLine
instance

DBSERVERNAME asapp91p91shm # default database server

DBSERVERALIASES asapp91p91tcp,x9168p91tc1,x9168p91tc2 #

NETTYPE ipcshm,1,60,

NETTYPE soctcp,15,120,NET

DEADLOCK_TIMEOUT 60 # Max time to wait of lock in
distributed env.

RESIDENT -1 # Forced residency flag (Yes = 1, No =
0)

MULTIPROCESSOR 1 # 0 for single-processor, 1 for
multi-processor

NUMCPUVPS 62 # Number of user (cpu) vps

SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps
to one

MUTEX_WAIT_LISTS 0 # If non-zero, force use of mutex wait
lists

NOAGE 1 # Process aging

AFF_SPROC 0 # Affinity start processor

AFF_NPROCS 0 # Affinity number of processors

BUFFERPOOL
default,buffers=1000000,lrus=32,lru_min_dirty=1.000000,lru_max_dirty=2.0
00000

BUFFERPOOL
size=2K,buffers=50000000,lrus=60,lru_min_dirty=0.020000,lru_max_dirty=0.
040000

BUFFERPOOL
size=8K,buffers=24000000,lrus=60,lru_min_dirty=0.030000,lru_max_dirty=0.
070000

NUMAIOVPS 2 # Number of IO vps

PHYSBUFF 1024 # Physical log buffer size (Kbytes)

LOGBUFF 64 # Logical log buffer size (Kbytes)

CLEANERS 128 # Number of buffer cleaner processes

SHMBASE 0x0 # Shared memory base address

SHMVIRTSIZE 32000000 # initial virtual shared mem segment
size

SHMADD 4000000 # Size of new shared memory segments
(Kbytes)

SHMTOTAL 0 # Total shared memory (Kbytes).
0=>unlimited

CKPTINTVL 3600 # Check point interval (in sec) <<<EURO

LTXHWM 18 # Long transaction high water mark
percentage

LTXEHWM 85 # Long transaction high water mark
(exclusive)

TXTIMEOUT 0x12c # Transaction timeout (in sec)

STACKSIZE 256 # Stack size (Kbytes)

OFF_RECVRY_THREADS 30 # Default number of offline worker
threads

ON_RECVRY_THREADS 4 # Default number of online worker
threads

DRINTERVAL 30 # DR max time between DR buffer flushes
(in sec)

DRTIMEOUT 30 # DR network timeout (in sec)

DRLOSTFOUND /informix/P91/etc/dr.lostfound # DR lost+found file path

BAR_ACT_LOG /home/informix/logs/bar_act.log

BAR_DEBUG_LOG /home/informix/tmp/bar_dbug.log

BAR_MAX_BACKUP 2

BAR_RETRY 1

BAR_DEBUG 0

BAR_PROGRESS_FREQ 0

BAR_NB_XPORT_COUNT 10

BAR_XFER_BUF_SIZE 31

BAR_BSALIB_PATH /informix/P91/lib/libbsa.so

RA_PAGES 32 # Number of pages to attempt to read
ahead

RA_THRESHOLD 24 # Number of pages left before next group

DBSPACETEMP tmpdbs1,tmpdbs2,tmpdbs3,tmpdbs4,tmpdbs5,tmpdbs6

# Default temp dbspaces

DUMPDIR /home/informix/dumps # Preserve diagnostics in this
directory

DUMPSHMEM 0 # Dump a copy of shared memory

DUMPGCORE 0 # Dump a core image using 'gcore'

DUMPCORE 0 # Dump a core image (Warning:this aborts
OnLine)

DUMPCNT 1 # Number of shared memory or gcore dumps
for

# a single user's session

FILLFACTOR 90 # Fill factor for building indexes

USEOSTIME 0 # 0: use internal time(fast), 1: get
time from OS(slow)

MAX_PDQPRIORITY 10 # Maximum allowed pdqpriority

DS_MAX_QUERIES 20 # Maximum number of decision support
queries

DS_TOTAL_MEMORY 24000000 # Decision support memory (Kbytes)
after crash

DS_MAX_SCANS 1024 # Maximum number of decision support
scans

DATASKIP off

ONDBSPACEDOWN 1 # Dbspace down option: 0 = CONTINUE, 1 =
ABORT, 2 = WAIT

OPCACHEMAX 128 # Maximum optical cache size (Kbytes)

HETERO_COMMIT 0

DD_HASHSIZE 613 # Length of DD Hash; 03-Nov-94

DD_HASHMAX 30 # Width of DD Hash; 03-Nov-94

LOCKS 8000000 # Maximum number of lock

WSTATS 1

TBLSPACE_STATS 1

CDR_EVALTHREADS 1,1 # evaluator threads
(per-cpu-vp,additional)

CDR_DSLOCKWAIT 5 # DS lockwait timeout (seconds)

CDR_QUEUEMEM 4096 # Maximum amount of memory for any CDR
queue (Kbytes)

OPTCOMPIND 0

SYSALARMPROGRAM /informix/P91/etc/evidence.sh # System Alarm program
path

ISM_DATA_POOL ISMDiskData # If the data pool name is changed, be
sure to

ISM_LOG_POOL ISMDiskLogs

OPT_GOAL -1

DIRECTIVES 1

RESTARTABLE_RESTORE off

CDR_NIFCOMPRESS 0 # Link level compression (-1 never, 0
none, 9 max)

NOFUZZYCKPT 1

DYNAMIC_LOGS 2

CDR_SERIAL 0,0 # Serial Column Sequence

CDR_DBSPACE # dbspace for syscdr database

CDR_QHDR_DBSPACE # CDR queue dbspace (default same as
catalog)

CDR_QDATA_SBSPACE # List of CDR queue smart blob spaces

CDR_MAX_DYNAMIC_LOGS 0 # Dynamic log addition disabled by
default

SBSPACENAME # Default smartblob space name - this is
where blobs

SYSSBSPACENAME # Default smartblob space for use by the
Informix

BLOCKTIMEOUT 3600 # Default timeout for system block

ALLOW_NEWLINE 0 # embedded newlines(Yes = 1, No = 0 or
anything but 1)

BTSCANNER num=9,priority=high,threshold=500000,rangesize=500

VP_MEMORY_CACHE_KB 0

DS_NONPDQ_QUERY_MEM 1024

TBLTBLFIRST 500 # First extent size (Kbytes) (0 =
default)

TBLTBLNEXT 100 # Next extent size (Kbytes) (0 =
default)

IFX_EXTEND_ROLE 1 # To control the usage of EXTEND role.

ALRM_ALL_EVENTS 0 # Triggers ALARMPROGRAM for any event
occur

EXTSHMADD 8192 # Size of new extension shared memory
segments (Kbytes)

SHMVIRT_ALLOCSEG 0.000000 # Values between 0 and .99 are %,
values > 1 are

DRAUTO 0 # DR automatic switchover

DRIDXAUTO 0 # DR automatic index repair. 0=off, 1=on

ONLIDX_MAXMEM 5120 # Per pool per index (Kbytes)

LISTEN_TIMEOUT 10 # Timeout (in Seconds)

IFX_FOLDVIEW 0 # fold multiple tables or union all view
with ansi joins

Regards,

Andreas Kutsche
-------------------------------------------
SPAR Osterreichische Warenhandels-AG
Hauptzentrale
A - 5015 Salzburg, Europastrasse 3
FN 34170 a

Tel: +43 662 4470 24223
Mobile: +43 664 6259575
E-Mail: Andreas.KUTSCHE@spar.at
Internet: http://www.spar.at

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