Re: Kernel parameters with Online 7.2 & unixware2.1.2

In article <36012438.703C59D8@geocities.com>, Bill Peck <wtpeck@geocities.com> writes >Jim, >Increasing the number of semaphore identifiers in the kernal should have >no visible effect to Online. But, when increasing this parameter also >increase the "Max number of Semaphores" semmns, "Number of Semaphore Undo >Structures" semmnu, and "Semaphore Undo Entries per Process" semmnu. >Take a look at the man page on semaphore usage to get a feel for how >these kernal limits are used. Online uses semahores as needed in its >locking logic. When informix can no longer grab semaphores or shared >memory it will CRASH! I've had it happen a couple of times till I found >a value that worked with my large Informix database. >Bill >wtpeck@geocities.com > Correct. I normally set all the parameters to 1000, 2000 on a large installation. Also I set the SHM patameters to allow at least 1000 per process. You will waste less than 1/2Mb this way. Most machine i work with have at least 128Mb of memory. I figure if you are down to you r last 0.5Mb i.e. 0.5% of memory then it's probably time to upgrade. Luck I did this because a customer was having problems with a package called SONNET for printing on Sun's. Once I bumped the parameters up that started working as well!! Values of 1000/2000 will allow several apps to use shared memory/ semaphores and should never need to be increased...no more reboots to reconfigure the kernel... >James McCallum wrote: > >> Anyone, >> >> The Informix -Online 7.2 recommends some kernel parameters in its >> machine specific release notes. I would like to increase SEMMNI from >> the recommended 50 to 1000 to over come a semeaphore structure >> shortage caused by the high number of tcp connections. But I'm >> looking for some advise on the impact to Online if this is increased. >> >> Many thanks Jim > -- David Williams Maintainer of the Informix FAQ Primary site (Beta Version) http://www.smooth1.demon.co.uk Official site http://www.iiug.org/techinfo/faq/faq_top.html I see you standin', Standin' on your own, It's such a lonely place for you, For you to be If you need a shoulder, Or if you need a friend, I'll be here standing, Until the bitter end... So don't chastise me Or think I, I mean you harm... All I ever wanted Was for you To know that I care