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IDS Forum

Increasing shared memory

Date: Friday, 17 February 2012, at 12:42 a.m.

Hi All,

We have Informix 11.10.FC2 on SUSE Linux 10,RAM 24GB with shared memory of 19190788 Kbytes. The bufferpool is as follows:
BUFFERPOOL default,buffers=102400,lrus=32,lru_min_dirty=1.000000,lru_max_dirty=2.000000
BUFFERPOOL size=2K,buffers=204800,lrus=32,lru_min_dirty=1.000000,lru_max_dirty=2.000000
BUFFERPOOL size=8K,buffers=1700000,lrus=128,lru_min_dirty=1.000000,lru_max_dirty=2.000000

We added 24GB more RAM to system and tried doubling the shared memory due to performance issues by setting the buffers as follows:
BUFFERPOOL default,buffers=204800,lrus=32,lru_min_dirty=1.000000,lru_max_dirty=2.000000
BUFFERPOOL size=2K,buffers=409600,lrus=32,lru_min_dirty=1.000000,lru_max_dirty=2.000000
BUFFERPOOL size=8K,buffers=3400000,lrus=128,lru_min_dirty=1.000000,lru_max_dirty=2.000000

Instead of improving, the server perfromance has degraded. The processes are taking longer time. Also the IDS shuts downs in between with the following error:
Fatal error in ADM VP at mt.c:13388
Unexpected virtual processor termination, pid = 1825, exit = 0x9
PANIC: Attempting to bring system down

We had the followng advisory in the online.log
09:45:31 WARNING! Logical log layout may cause Dynamic Server to get into

a locked state. Recommended smallest logical log size

is 16 times maximum concurrent user threads.

09:59:56 Performance Advisory: Logical log file size might be too small for a

checkpoint to complete.
09:59:56 Results: The size of individual logical log files is too small for

the current workload, resulting in each log file filling very

quickly. If log files fill in less than 30 seconds, the checkpoint

might remain blocked because the last log file fills during the time

needed to perform the checkpoint.
09:59:56 Action: Increase the size of the individual logical log files so

that it takes at least 30 seconds to fill each one. Look at the

online log to determine how quickly the log files are filling, and

then increase the size of the files proportionately.

10:53:13 Performance Advisory: Based on the current workload, the physical log might be too small to
accommodate the time it takes to flush the buffer pool.
10:53:13 Results: The server might block transactions during checkpoints.
10:53:13 Action: If transactions are blocked during the checkpoint, increase the size of the
physical log to at least 739760 KB.

Also when checked the swap memory was completely utilised. So we had to rollback the buffer changes and get it back to the old setting of the buffer.

I would like to know the following after increasing the shared memory:
1) If the shared memory is to be increased, what are the other parameters (LGOBUFF, PHYBUFF)to increase along with buffers, lrus, lru_min_dirty, lru_max_dirty?
2) What are areas we need to look into apart from increasing the shared memory? What are the utilies (eg. onstat -g con) that will help us analyze the performance?

Do let me know if any details are required.
thanks in advance.


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