vmstat:
those high "in" and "cs" value .. i know what they are ..
in --> Number of interrupts received by the system per second
cs --> Rate of context switching in the process space (in number/sec)
but what they do, is this is the thing that is affecting my system?? .....
---------- Post updated at 06:11 AM ---------- Previous update was at 05:49 AM ----------
I found something::
in: The number of interrupts per second, including the clock.
cs: The number of context switches per second.
(A context switch occurs when the currently running thread is different from the previously running thread, so it is taken off of the CPU.)
It is not uncommon to see the context switch rate be approximately the same as device interrupt rate (in column)
If cs is high, it may indicate too much process switching is occurring, thus using memory inefficiently.
If cs is higher then sy, system is doing more context switching than actual work.
High r with high cs -> possible lock contention
Lock contention occurs whenever one process or thread attempts to acquire a lock held by another process or thread. The more granular the available locks, the less likely one process/thread will request a lock held by the other. (For example, locking a row rather than the entire table, or locking a cell rather than the entire row.)
When you are seeing blocked processes or high values on waiting on I/O (wa), it usually signifies either real I/O issues where you are waiting for file accesses or an I/O condition associated with paging due to a lack of memory on your system.
but still not able to understand the lock contention part and what should I do to resolve this issue. ??
Hi,
I am seeing very high kernel usage and very high load averages on my system (Although we are not loading much data to our database). Here is the output of top...does anyone know what i should be looking at?
Thanks,
Lorraine
last pid: 13144; load averages: 22.32, 19.81, 16.78 ... (4 Replies)
Hi Buddies,
Thanx for reading my first post...
After googling a lot and searching so many forums I am feeling down a bit...
Please don't mind my ignorence, and my grammer ... :)
My server is running RHEL 2.6.9-5.EL. The cpu load is going higher than roof, almost 100 sometimes.
I am... (2 Replies)
Hello all, I have a question about load averages.
I've read the man pages for the uptime and w command for two or three different flavors of Unix (Red Hat, Tru64, Solaris). All of them agree that in the output of the 2 aforementioned commands, you are given the load average for the box, but... (3 Replies)
Hi All,
Please see to the prstat o/p of one of my sun box..
Total: 1 processes, 68 lwps, load averages: 531.00, 305.18, 144.77 Check the pstack ....
As i have read in all docs , people say a value of 5 is considered high CPU usage , i don't know then how we can even relate those... (3 Replies)
Hi AIX Expert,
the fr (page freed/page replacement) and sr (pages scanned by page-replacement algorithm) values from the vmstat output (see below please) are very high. I usually see this high value during the oracle database backup. In addition, the page scan/page steal/ page faults values... (7 Replies)
i have a Intel Quad Core Xeon X3440 (4 x 2.53GHz, 8MB Cache, Hyper Threaded) with 16gig and 1tb harddrive with a 1gb port and my apache is causing my cpu to go up to 100% on all four cores heres my http.config
<IfModule prefork.c>
StartServers 10
MinSpareServers 10
MaxSpareServers 15... (4 Replies)
Hi all, hope you can help me. I'm getting high load average and can't find a reason for this, please share your inputs.
load average: 7.78, 7.50, 7.31
Tasks: 330 total, 1 running, 329 sleeping, 0 stopped, 0 zombie
Cpu0 : 7.0%us, 1.0%sy, 0.0%ni, 23.9%id, 0.0%wa, 38.9%hi,... (4 Replies)
With linux kernel 2.4.22-1.2199.nptlsmp (I know, it's very old) Sometimes Load average increases to big value (over 7) but my 4 vCPU are in
idle state (5% busy every cpu). My web procedure was gone down so I found out that process (with 4732 process id, see my following output)
was in... (4 Replies)