what can i do when i see with topas that i have faults of 7000 and 0 in PsgpIn and PsgpOut with some activity on PageIn and PageOut.
Is it normal situation?
High paging faults is known as thrashing in UNIX enviroments and it's not a normal situation at all. In AIX there are some parameters you can set in order to prevent this behavior. Parameters like maxperm|minperm|maxclient in order to free real memory for specific use of file pages.
Before you go tuning anything, call IBM's AIX Support and talk to them regarding this.
Do post the output of below commands:-
Code:
#lsps -a
#vmo -a | egrep "maxperm|minperm|maxclient"
Here is a quick-and-dirty first estimation of a possible memory shortage:
Issue "svmon -G" and compare the numbers marked bold in the following example:
Code:
size inuse free pin virtual
memory 1572864 1557689 15175 389150 1311648
pg space 2097152 427109
work pers clnt
pin 388839 0 311
in use 977383 0 580306
PageSize PoolSize inuse pgsp pin virtual
s 4 KB - 1448041 427109 318814 1202000
m 64 KB - 6853 0 4396 6853
The memory is measured in 4k-pages here. The ~1.5 millions means 6GB real memory therefore. Then compare the "inuse" number with the "virtual" number and if the "virtual" number is significantly higher the difference is about the memory you are lacking. i.e 1.5 mio "inuse" versus 2 mio "virtual" means you need to add about 500k x 4k ~= 2GB memory.
Again, this is only a QUICK and ROUGH estimation, not an in-depth analysis. Such an analysis might well reveal a different number.
Another place to look is "vmstat -v", especially for machines with a high I/O-workload. Have a look at the lines marked bold in the following example:
Code:
1572864 memory pages
1487316 lruable pages
15273 free pages
1 memory pools
389150 pinned pages
80.0 maxpin percentage
20.0 minperm percentage
80.0 maxperm percentage
37.0 numperm percentage
551288 file pages
0.0 compressed percentage
0 compressed pages
37.0 numclient percentage
80.0 maxclient percentage
551288 client pages
0 remote pageouts scheduled
17676 pending disk I/Os blocked with no pbuf151067 paging space I/Os blocked with no psbuf2484 filesystem I/Os blocked with no fsbuf
0 client filesystem I/Os blocked with no fsbuf
474712 external pager filesystem I/Os blocked with no fsbuf
0 Virtualized Partition Memory Page Faults
0.00 Time resolving virtualized partition memory page faults
These are totals therefore repeat that command every minute or so and observe the change in these numbers. If they grow at a very fast rate the system has not enough memory to spare for buffered disk-I/O. Probably you will notice a very bad filesystem performance because of this. Usually this is due to a very constrained memory situation and while you might somewhat deescalate the situation by some tuning you will probably need more memory to solve tis problem.
Hi & good day UNIX / Linux folks,
Some of my > 700 pages don't have this counter:
<!--#exec cgi="/cgi-bin/counter"-->
How would one use find (?!) to know which pages _don't have_ this counter, or - alternatively - which don't have the string:
exec cgi (=bec. probably easier, "exec\... (9 Replies)
Can anyone supply me with the man pages for:
omnidatalist
omnibarlist
omnisap.exe
I prefer the source man pages in nroff format.
A clue about the software bundles which supply these man pages is fine as well.
OS: HP-UX
TIA (11 Replies)
Hi everyone,
I have a small query, in solaris the man pages get displayed on half of the terminal , can i get a full terminal or full screen display ?:) (2 Replies)
Hi,
I am new to linux. I am using more command to view the contents of a file. If the file has many pages i am using f to move forward to the next page.
But when i press f it skips to two pages instead of one page. i checked the man more.
It shows the default is 1. Please share your... (1 Reply)
Hi all.
A friend of mine just recently gave me an old RISC 6000 machine to learn on for my AIX certification. I installed AIX 4.3.3 and everything seems to work fine, except there are no man pages. Is there a way to generate man pages on this machine?
Thanks alot in advance. (5 Replies)
okay.. have monitored that the page out/h max and avg have been 0 for one week. is this possible...? huge applications will have swap space being utilised ... so i am suprised that for one whole week, it has actually been zero
please advise
thanks (1 Reply)
When reading man pages, I notice that sometimes commands are follwed by a number enclosed in parenthesis. such as:
mkdir calls the mkdir(2) system call.
What exactly does this mean? (4 Replies)
Hi,
I've written now a man pages, but I don't knwo how to get 'man' to view them. Where have I to put this files, which directories are allowed??
THX Bensky (3 Replies)
