Intimate Shared Memory (ISM)

Thread Tools Search this Thread
Operating Systems Solaris Intimate Shared Memory (ISM)
# 8  
Old 10-20-2009
I'm not sure how to interpret your mean about paging (I assume you really meant paging and not swapping.. they have different meanings in a Solaris system).

With DISM, deciding which pages in the SGA are pagable is managed by the Oracle. So things can get interesting if there is pressure on the page cache (physical memory) by things not handled by Oracle. It may make decisions that cause poor performance. So, yes, you will use the swap (if that's what you mean by VM from harddisk) areas more than you'd like.

You should really only use DISM if you have a real need to change the SGA on the fly. That's my opinion and I'm sticking to it... unless someone comes up with a better one Smilie
# 9  
Old 10-20-2009
Thanks for your explanation.

I conclude with DISM the swapping to VM (disk) is still function. I'm asking this question because my swap on container doesn't work out. With command vmstat -5 the po column is 0 even when the memory is full in use. I tot the DISM/ISM is the cause of this anomaly. I guess I have to find out another cause then..

Last edited by sprout009; 10-20-2009 at 10:24 AM..
# 10  
Old 10-20-2009
Originally Posted by sprout009
I'm asking this question because my swap on container doesn't work out. With command vmstat -5 the swapped paged in/out is 0 even when the memory is full in use.
According to the documentation, these statistics are only reported at the zone level when a processor set is bound to that zone.
# 11  
Old 10-20-2009

And so far there is no solution for this? So we need to upgrade physical RAM?

Could you pass the document to my email Thanks.
# 12  
Old 10-20-2009
A solution to what problem ?
vmstat not reporting paging activities with zone granularity ?

The documentation is on your host:
man vmstat

# 13  
Old 10-20-2009
What metric do you use to justify that your memory is "full"? If your memory was full from a Solaris point of view, you would first start paging then swapping and performance would go bad. You would also probably see a non zero b count in vmstat among other things..
# 14  
Old 10-20-2009

To jlliagre:
I meant the solution why the swap doesn't work on Solaris zone.

To jp2542a: My application on zone "shouted out" the malloc failed due to out of memory, that's the obvious metric I used. I used vmstat to check resource stat and found that my zone doesn't use the allocated swap area on disk.

I guess my problem is clear that I'm running out of memory and the swap to disk doesn't work out. I tried to post and searching for a solution but I got back and forward explanation instead
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

Shared library with acces to shared memory.

Hello. I am new to this forum and I would like to ask for advice about low level POSIX programming. I have to implement a POSIX compliant C shared library. A file will have some variables and the shared library will have some functions which need those variables. There is one special... (5 Replies)
Discussion started by: iamjag
5 Replies

2. AIX

shared memory

1.How to know wich process is using the shared memory? 2.How to flush (release) the process from the shared memory? (1 Reply)
Discussion started by: pchangba
1 Replies

3. UNIX for Advanced & Expert Users

Shared Memory

Hi, Using ipcs we can see shared memory, etc.. details. How can I add/remove shared memory(command name)? Thanks, Naga:cool: (2 Replies)
Discussion started by: Nagapandi
2 Replies

4. Programming

Shared memory for shared library

I am writing a shared library in Linux (but compatible with other UNIXes) and I want to allow multiple instances to share a piece of memory -- 1 byte is enough. What's the "best" way to do this? I want to optimize for speed and portability. Obviously, I'll have to worry about mutual exclusion. (0 Replies)
Discussion started by: otheus
0 Replies

5. Programming

Shared memory in shared library

I need to create a shared library to access an in memory DB. The DB is not huge, but big enough to make it cumbersome to carry around in every single process using the shared library. Luckily, it is pretty static information, so I don't need to worry much about synchronizing the data between... (12 Replies)
Discussion started by: DreamWarrior
12 Replies

6. Programming

memory sharing - not shared memory -

hi, this is the problem: i want to swap a linked list between 4 processes (unrelated), is there any way i can do that just by sending a pointer to a structure? //example typedef struct node { int x; char c; struct node *next; } node; or i should send the items ( x,c ) by... (9 Replies)
Discussion started by: elzalem
9 Replies

7. Programming

help with shared memory

what i want to do is have an int that can been written into by 2 processes but my code doesn't seem to work. #include <sys/types.h> #include <sys/ipc.h> #include <sys/sem.h> #include <sys/shm.h> #include<stdio.h> #define KEY1 (1492) int main() { int shmid; volatile int * addr;... (6 Replies)
Discussion started by: ddx08
6 Replies

8. Linux

all about shared memory

Hi all :confused: , I am new to unix.I have been asked to implement shared memory in user's mode.What does this mean?What is the difference it makes in kernel mode and in users mode?What are the advantages of this impemenation(user's mode)? And also i would like to know why exactly shared... (0 Replies)
Discussion started by: vijaya2006
0 Replies

9. UNIX for Advanced & Expert Users

Shared memory shortage but lots of unused memory

I am running HP-UX B.11.11. I'm increasing a parameter for a database engine so that it uses more memory to buffer the disk drive (to speed up performance). I have over 5GB of memory not being used. But when I try to start the DB with the increased buffer parameter I get told. "Not... (1 Reply)
Discussion started by: cjcamaro
1 Replies

10. Programming

Shared memory

Dear Reader, Is is necessary to attach / dettach the shared memory segments for write operations , if more than one program is accessing same shared memory segments.. I have used semaphore mutex and still I'm getting segmentation fault when I write to the segment when other program is already... (1 Reply)
Discussion started by: joseph_shibu
1 Replies
Login or Register to Ask a Question