Re: System tuning

On 25 Mar 1996, Saeed Talebbeik wrote: > The person who replied to your article is right on the money. You CAN > NOT increase the buffer variable and expect the I/O performance go up. This depends on wheter we were low on mem or not. System stats showed that we weren't swapping. > If the system is running out of memory becuase your database is now > taking more memory space it will cause paging and process swapping and > cause the performance to go down. This I would expect to show quite drastically, if it were the case. > As far as all the time going to CPU VP's please check the following: > 1) Are you running exactly the same application as before ? Same application suite. No changes in code. > 2) use "vmstat 5 500" command to make sure that your application is not > causing an infinte loop in the CPU vp's. Don't have a vmstat in our brand of *NIX. What is it that this utility does? > For understanding what is some of the parctical uses of onstat utility > outputs please chack out the following book: > Informix Online performance tuning > By Elizabeth Suto > Prentice hall/Informix press > ISBN 0-13-124322-5 Thanks. I'll have to have a look at this. B. ------------------------------------------------------------------------- |Brian P. Hampson Internet : brian@asl-labs.bc.ca | |System Administrator, Air(2m/70cm): VE7NNW | |Analytical Service Labs Fidonet : Brian Hampson 1:153/733| |Vancouver, BC | |+604-253-4188 | | Specialists in Environmental Chemistry | | | ------------------http://www.asl-labs.bc.ca/-----------------------------