The context-switch tag has no wiki summary.
14
votes
5answers
21k views
How many Context Switches is “normal” (as a function of CPU cores (or other))?
Do any of you have a rule of thumb as to how many context switches (per processor core) is Normal on a Linux server?
My college here brought it up, and he's seeing 16K on a 8-core x86_64 machine.
...
2
votes
4answers
4k views
Find out which task is generating a lot of context switches on linux
According to vmstat, my Linux server (2xCore2 Duo 2.5 GHz) is constantly doing around 20k context switches per second.
# vmstat 3
procs -----------memory---------- ---swap-- -----io---- -system-- ...
2
votes
2answers
224 views
My linux server “Number of processes created” and “Context switches” are growing incredibly fast
I have a strange behaviour in my server :-/. Is a OpenVZ VPS (I think is OpenVZ, because /proc/user_beancounters exists and df -h returns /dev/simfs drive. Also ifconfig returns venet0). When I do cat ...
2
votes
1answer
319 views
High context switches on SQL Server box
We have a server with 2 quad xeon 5550 processors. The only application installed on the server is SQL server. CPU usage rarely goes above 40%, and the transaction rate is 2,000 transactions per ...
1
vote
1answer
259 views
number of context switches
I've got munin monitoring virtual private server. And here're graphs for context switches:
By day: http://imgur.com/ljon5.gif
What could have caused this? I'm not worried about the pike, because it ...
1
vote
3answers
2k views
cause for high Interrupts and context switches
Hey guys,
I have a quad core and I have spotted on munin (monitoring interrupts and context switches), that my interrupts and context switches spiked to 25k a second while the average was 250 for some ...
0
votes
3answers
396 views
CPU context switch per/second increasing with network traffic increasing
I have server with ubuntu server operation system, i have some applications on it which works with network. With an increase in network traffic, CPU context swithching and interrupts are also ...
0
votes
1answer
33 views
Rule of thumb to compare number of context switches on Linux and Windows
I am looking for a rough value to compare context switches between Windows and Linux (same hardware and similar load assumed). I found that Windows seems to have a smaller range of timeslice lengths ...
0
votes
0answers
70 views
Finding context switches count and run queue wait time for a process
I am observing (based on logs) that my (java) process pauses for something during execution. My first guess is a context switch. In order to verify I am trying to find (a) the number of involuntary ...
0
votes
0answers
78 views
is context switching slow
I'm having high system CPU usage with high-load Apache server running.
mpstat shows low %irq and %soft, but Apache spawns a lot of sub-processes, and I suspect context switches to be the reason of ...
0
votes
3answers
471 views
More interruptions than cpu context switches
I have a machine running Debian GNU/Linux 5.0.8 (lenny) 8 cores and 12Gb of RAM.
We have one core permanently around 40% ~ 60% wait time and trying to spot what is happening I realized that we have ...
-1
votes
0answers
24 views
Does a web server switch contexts between php scripts or do they run in sequence? [closed]
I occasionally get the feeling that on my vps account, one busy php script, like an image processing script, can hog the server and almost completely stop all other page deliveries for its duration. ...
-1
votes
0answers
26 views
vmstat - context switches ok? [closed]
I am rather new to this tool and server optimization so my eye is not trained yet. Could someone give me a reading of these stats output by vmstat and let me know whether the context switches (or ...
