From: VIVEK_SHARMA (VIVEK_SHARMA@infosys.com)
Date: Tue Feb 03 2004 - 00:53:59 EST
Folks,
ROOT CAUSE - Memory Overflow (NO Free Primary memory left) during
Operations
on APPLICATION Server m/c. This is seemingly causing CPUs to Choke too
with High CPU Run Queue
(seen below).
When a NON-SO(Archival) Compiled Application executable completes
execution
, the respective process ceases to exist. The Operating System
thereafter
Frees the Respective Shared , Resident & Personal Private memory Spaces
of
the Exe.
When a SO(Shared Object) Compiled Application executable completes
execution
, the respective process Continues to exist as this is the very
architecture
of SO Exes.
Seemingly the Operating System is NOT Freeing memory even though an
Explicit Command(within the program code) has been given to Free the
memory.
NOTE We are using the Pro*C Commands "malloc" & "free" to Allocate &
free memory respectively in the Application.
Qs How can we FREE the memory ?
Qs How can we check where the memory is being consumed ?
Qs Are there any Solaris UFS OR Veritas "mount" parameters /Other best
practice parameters which
would cause Freeing memory / LESSER memory management activities ?
Qs Are there any Alternate Pro*C Code commands which would cause Freeing
of memory?
Qs Any advice on how this issue can be approached ?
Will provide any Clarifications .
MISC. INFO. :-
For the SAME Transaction Load i.e. ALL Other conditions remaining Same
vmstat [ When using Application Compiled with NON-SO mode ]
kthr memory page disk faults
cpu
r b w swap free re mf pi po fr de sr s0 s6 s1 s6 in sy cs us
sy id
1 0 0 68901544 34474168 1221 5478 303 2 2 0 0 15 0 15 0 10318 33407 9006
15 9 76
0 0 0 34612744 18855656 3426 13111 412 8 8 0 0 47 0 47 0 17211 98818
27025 46 25 29
2 0 0 34630872 18848792 2862 12427 150 0 0 0 0 104 0 102 0 19729 90400
31224 49 25 27
7 2 0 34663848 18847424 4759 12517 16 0 0 0 0 239 0 239 0 18192 79776
28921 58 22 20
0 0 0 34774736 18961984 3179 12735 24 16 16 0 0 110 0 107 0 16425 78600
25707 50 23 27
0 0 0 34803664 18950456 2465 8596 0 8 8 0 0 22 0 22 0 15843 63097 24430
52 22 26
INFERENCE Free Primary Memory = 18.9 GB , Free Swap Space = 34.8 GB,
Idle
CPU = 26 % , CPU Run Queue = 0
vmstat [ When using Application Compiled with SO(Shared Objects) mode ]
kthr memory page disk faults
cpu
r b w swap free re mf pi po fr de sr s0 s6 s1 s6 in sy cs us
sy id
73 0 0 66150424 34502240 5266 11973 357 5 4 0 4 16 0 17 0 12996 93929
15053 41 18 41
196 1 0 15874584 2804560 3633 11756 2379 7 7 0 0 5 0 3 0 18917 63435
15354 74 26 0
189 0 0 15868576 2784424 3790 11742 2698 0 0 0 0 1 0 5 0 19087 74373
16871 73 27 0
196 0 0 15874440 2789632 3737 11411 2531 0 0 0 0 24 0 14 0 19095 85002
16518 74 26 0
197 0 0 15921560 2788272 2987 11081 3105 0 0 0 0 15 0 16 0 18472 64672
15074 77 23 0
177 0 0 15936000 2798272 3900 15477 2851 16 8 0 0 5 0 4 0 19588 70612
16189 72 28 0
INFERENCE Free Primary Memory = 2.79 GB , Free Swap Space = 15.9 GB,
Idle
CPU = 0 % , CPU Run Queue = 177
Application Server Machine SF6800
CPUs = 24 @ 750 MHz
Total Primary RAM Memory 41 GB
Total Swap configured 59 GB
Total Number of concurrent Processes on APP server 5000
Solaris 9
Oracle 9.2.0.3.0
Application - Banking - Hybrid nature
Thanks
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