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28
votes
1answer
2k views

Why isn't a straightforward 1/5/15 minute moving average used in Linux load calculation?

Until recently i thought the load average (as shown for example in top) was a moving average on the n last values of the number of process in state "runnable" or "running". And n would have been ...
7
votes
2answers
3k views

Why load is high despite the fact that neither CPU or disk is overused

I'm getting the following output from top: Cpu(s): 43.8%us, 32.5%sy, 4.8%ni, 2.0%id, 15.6%wa, 0.2%hi, 1.2%si, 0.0%st Mem: 16331504k total, 15759412k used, 572092k free, 4575980k buffers Swap:...
6
votes
2answers
2k views

How does load average work with modern CPU's?

My understanding of load average lead me to be quite shocked with my current system. The CPU in my workstation is an i7 with hyperthreading enabled, and cat /proc/cpuinfo produces 4 'cpu's. That all ...
8
votes
5answers
4k views

Understanding top and load average

I'm observing a high load average on a certain machine (about 9) in all three load fields. I understand load as the number of processes in state "run" / currently desiring CPU time. Am I correct at ...
7
votes
4answers
4k views

Is setting a higher nice level for a process an effective way to reduce its impact on system load/CPU time?

I have an rsync cron job which is pushing the server load and triggering monitor alerts. If I set the job to be run with a high nice level, would that effectively reduce the impact it has on system ...
24
votes
1answer
70k views

How do I get sar to show for the previous day?

on our servers, typing sar show's the system load statistics for today starting at midnight, is it possible to show yesterdays statistics?
11
votes
3answers
833 views

Any utility to find source of system load / load average for a certain period?

By running top, htop, uptime, etc. we can see the load average as three values indicating the average load for the last 1/5/15 minutes (well not really, but that isn't the question here). Sometimes I'...
8
votes
1answer
17k views

Very high CPU load, but nothing significant in top

I'm running Ubuntu Linux 12.04.1, with VirtualMin 4.08.gpl GPL and 2 CPU cores. Pretty much all the time for the last few weeks, it's been running at well above load average of 5, usually up closer ...
7
votes
1answer
137 views

reserve resources for admin console

My server is often almost DOS'ed by crawlers. I have not yet managed to figure out what exactly is responsible for the high load. CPU, memory and disk IO are not at the limit (could be network traffic)...
4
votes
1answer
228 views

why would there be a load of 5 if there are zero processes in the runq?

This doesn't make sense to me, why would there be a load of 5 if there are zero processes in the runq? 12:00:01 AM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 12:05:01 AM 0 708 ...