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тАО09-24-2007 11:11 PM
тАО09-24-2007 11:11 PM
The server is running an application called WebCT Vista 4 which generates several java processes.
I started to notice the server was running very slow and affecting performance.
The top command displayed CPUs were idle around 75% to 100% idle. However. memory utilization was hitting 52%.
I wanted to investigate further so I used the ps command to check the process id of the java application displayed by top but ps would not display those java process ids?
Does anyone know why top displays process ids which ps cannot detect?
Also ideas why the server running slow?
I have attached which displays output of top command.
Solved! Go to Solution.
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тАО09-24-2007 11:16 PM
тАО09-24-2007 11:16 PM
SolutionAlso, you should investigate I/O activity. It's not common to have 52% of memory used, Linux normally tries to use 99% of memory.
Please post the output of:
vmstat 5 10
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тАО09-25-2007 12:17 AM
тАО09-25-2007 12:17 AM
Re: Slowness of system
The server has since been rebooted.
The first output of top is from yesterday before the reboot.
The second output of vmstat is from today since yesterdays's reboot.
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тАО09-25-2007 12:18 AM
тАО09-25-2007 12:18 AM
Re: Slowness of system
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тАО09-25-2007 12:32 AM
тАО09-25-2007 12:32 AM
Re: Slowness of system
Are you sure that the server was slow? Or the application was slow?
This is because, according to the output of top, your server wans't doing anything.
Java process do not uses CPU, and most CPU was idle. Memory utilization could be normal, your load average was very slow. There was no IO WAIT, swap was not in use, so that makes me assume that the system wasn't paging.
So, was the server really slow or just the application unresponsive? If you login to the system, and run some commands, you notice is slow also?
Have you verified if you have some network related problems? Check the output of netstat -ni if you see errors/collisions.
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тАО09-25-2007 01:58 AM
тАО09-25-2007 01:58 AM
Re: Slowness of system
I was able to type any unix command e.g. ps,vmstat,ls,watch and it responded back immediately. However, the WebCT application was very slow on the server.
There were no network related issues.We also checked the F5 load balancer and there was not much traffic going through it.
I have attached the output netstat -ni.
So if the server response was not the problem and the application was runnin very slow then what does this mean and I do find a solution for it?
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тАО09-25-2007 02:35 AM
тАО09-25-2007 02:35 AM
Re: Slowness of system
Also, please keep asigning points.
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тАО09-25-2007 02:54 AM
тАО09-25-2007 02:54 AM
Re: Slowness of system
I will get back to the DBA who look after the WebCT application and run debug on the application.
Thank you for your advice.