Hi, We have couple of database servers, very highly speced. HP DL585, 4xAMD Opteron, 32 GB RAM...... They both are usually under heavy loads.
Very recently (around a month or so back) the system is appearing more busier and some slowness has also been reported by users. Initial thought of memory leaks (it runs lots of java xml transformations after extracting data from database) in some java code are out of question as the performance is same even after a planned reboot. While investigating the same I had some questions about the system, after having a look at the RRDTool graphs. (1.) A 6 weeks RRDTool graph shows me an average usage of 28GB RAM as cached and 1GB free. While maximum cached is 30 GB and maximum free is 21GB. Who decides how much RAM is to be cached, kernel? Is it controllable? (2.) At times I have seen that even if I had 10GB of free RAM the system was still swapping. Infact I havent seen the swap space zero at any point of time on these servers. Why? The swap space statictics over a 6 weeks period are - Server 1 - average swap usage 170MB and max usage 1GB Server 2 - average swap usage 194MB and max usage 2GB Increase in swap usage has been observed when number of java xml transformations are running. If any of you can suggests anything to improve on performance. The application (which includes java code) is heavy on CPU (which is maxed out almost all the times). Regards. -- Ajitabh Pandey http://www.ajitabhpandey.info/ ICQ - 150615062 Registered Linux User - 240748 GnuPG Key ID - C2AED210 Key fingerprint = 8A56 0684 44C2 3373 D441 20AF 7398 4DEB C2AE D210 ----------------------------------- You will be run over by a bus. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-india-help mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-india-help
