Linux server performance issue
I have a server running cacti with 2 cpu & 2 gb memory. It is showing me 100% cpu utilized for some perl scripts getting information from storage luns. memory also 98-99 % utilized. I tried to tune vm.swappiness to 80, as i thought that the memory is less so swapping the pages out may help, but still the performance is killing. kindly let me know wht all parameters can be checked to tune the linux system. I am using nmon tool.
Steven Vona
I would check the perl scripts. Seems like one of them might be in some kind of infinite loop.
ASKER
These perl scripts are standard template. We are in a process of checking the scripts, but apart from that, is there any kernel parameters which we can tune to increase the performance based on output of iostat, vmstat or sar.
ASKER
[root@server ~]# sar -B 2 3
Linux 2.6.18-164.el5 (epnetmon4.vvtv.com) 08/19/2010
10:45:17 AM pgpgin/s pgpgout/s fault/s majflt/s
10:45:19 AM 8450.25 38.19 8664.82 371.86
10:45:21 AM 8078.00 220.00 8401.50 367.00
10:45:23 AM 7990.00 82.00 8307.00 389.00
Average: 8172.29 113.52 8457.43 375.96
[root@server ~]# cat /proc/sys/vm/swappiness
60
Sar is showing that the system is swaping very much, i changed the value from 60 to 80 yesterday without reboot & today i changed it back to 60 without reboot, as I was not getting any performance gain. kindly suggest. Do i need to tune vm.swappiness & vm.overcommit_memory for performance gaining. kindly suggest
Linux 2.6.18-164.el5 (epnetmon4.vvtv.com) 08/19/2010
10:45:17 AM pgpgin/s pgpgout/s fault/s majflt/s
10:45:19 AM 8450.25 38.19 8664.82 371.86
10:45:21 AM 8078.00 220.00 8401.50 367.00
10:45:23 AM 7990.00 82.00 8307.00 389.00
Average: 8172.29 113.52 8457.43 375.96
[root@server ~]# cat /proc/sys/vm/swappiness
60
Sar is showing that the system is swaping very much, i changed the value from 60 to 80 yesterday without reboot & today i changed it back to 60 without reboot, as I was not getting any performance gain. kindly suggest. Do i need to tune vm.swappiness & vm.overcommit_memory for performance gaining. kindly suggest
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Met the expectation