Questions tagged [load]
94 questions
52
votes
3 answers
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?
xenoterracide
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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 defined by the "length" of the moving average: since…
user368507
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3 answers
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: 4194296k total, 260644k used, 3933652k free,…
user4951
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4 answers
Why is kworker consuming so many resources on Linux 3.0.0-12-server?
Last Friday I upgraded my Ubuntu server to 11.10, which now runs with a 3.0.0-12-server kernel. Since then the overall performance has dropped dramatically. Before the upgrade the system load was about 0.3, but currently it is at 22-30 on an 8 core…
mailq
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15
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5 answers
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 reasoning that if N processes are running on my…
Gabriel Schreiber
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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 to 10, sometimes reaching 20.
Right now, CPU load…
rjbathgate
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12
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3 answers
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'll notice that I have a fairly high load average…
Quantumboredom
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12
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1 answer
SSH server always available under heavy load
Is there a way my SSH server, and everything under it (including bash) can be always available under heavy load ?
Maybe it could be some kind of a critical path, all in memory, with a dedicated CPU or something like that.
What is the way I could…
blue112
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11
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4 answers
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 load values?
Gregg Leventhal
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9
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How to debug causes of excessive ksoftirqd resource usage?
man ksoftirqd indicates that:
If ksoftirqd is taking more than a tiny percentage of CPU time, this
indicates the machine is under heavy soft interrupt load.
I'm working with a Debian Wheezy system under generally high system utilization in…
mrP
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8
votes
1 answer
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). My question is, if anyone has an idea how to…
ensonic
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8
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3 answers
Detailed Per-Process Profiling
I am looking for a way to profile a single process including time spent for CPU, I/O, memory usage over time and optionally system calls.
I already know callgrind offering some basic profiling features but only with debugging information and lacking…
scai
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7
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2 answers
Why "uninterruptible sleep" is not counted as "IDLE"?
When I run top -bi, where the parameter -i means "ignore idle processes", the resulted list(see below) of processes are either R or D, although there're S processes at that time.
So, why uninterruptible sleep is not counted as "idle"? And, it seems…
twimo
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7
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Throttling web crawlers
My website is being DoS'ed by Google webspiders. Google is welcome to index my site, but sometimes it is querying a tagcloud on my site faster than my webserver can produce the results, making my webserver run out of resources.
How can I limit…
jippie
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6
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3 answers
Is there a way to discover why my server had a high load
Just now I was forced to remotely reboot my CentOS 6.3 system due to a ultra high load (75!) that paralyzed the system. This is a web/mail server that serves a wordpress blog (mySQL + PHP).
Is there any log I can analyze and try to discover what…
Duck
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