Mike, Thanks for taking a stab at it.
Double checking the data, 0.64 is really 0.64% and not 64%. ps on the box doesn't indicate that gmond has a nice value of 0. However, it does show that some of the user processes we'd expect on the box have nice values of 15 and not 0. These processes are running at nice level of 0 on other machines. Could this be a cause of the behavior? Maybe if I rephrase the question it might help... Can anyone think of a reason that the 4 cpu metrics (user+system+wio+idle) would not sum to near 100%? On a dual CPU system? Regards, Bart Hampshire > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:ganglia-general- > [EMAIL PROTECTED] On Behalf Of michael chang > Sent: Saturday, October 08, 2005 6:41 PM > To: Bart Hampshire > Cc: > Subject: Re: [Ganglia-general] CPU Metrics Question > > On 10/8/05, Bart Hampshire <[EMAIL PROTECTED]> wrote: > > Hello all, > > > > Was wondering if someone might be able to explain why it is that we > often > > see total CPU Utilization (User + System + WIO + Idle) at values > > substantially below 100%. When this happens, the reported user portion > is > > almost always zero while running top on the box shows that 90+% of the > > CPU(s) is(are) being utilized by user processes. The XML stream on the > > gmond collector (we are using gmond in unicast mode) node is reporting > the > > values that appear recorded in the gmetad's RRDs. From this, it appears > > that the CPU User metric isn't registering the utilization properly. > > > > Linux kernel versions are 2.4.x and 2.6.x on Red Hat and SLES x86 boxes. > > > > Sample data collected from RRD's to follow sig in which the reported > total > > sum of CPU Utilization was below 10%. > > > 7-9-2005 13:10 User: 0.00 System: 0.56 WIO: 0.00 Idle: 0.09 Total: 0.64 > > 7-9-2005 13:15 User: 0.00 System: 0.60 WIO: 0.00 Idle: 0.10 Total: 0.70 > > 7-9-2005 13:20 User: 0.00 System: 0.60 WIO: 0.00 Idle: 0.10 Total: 0.70 > > 7-9-2005 13:05 User: 0.00 System: 1.96 WIO: 0.00 Idle: 0.06 Total: 2.02 > > 7-9-2005 13:10 User: 0.00 System: 1.30 WIO: 0.00 Idle: 0.00 Total: 1.30 > > 7-9-2005 13:15 User: 0.00 System: 1.30 WIO: 0.00 Idle: 0.00 Total: 1.30 > > 7-9-2005 13:20 User: 0.04 System: 1.65 WIO: 0.00 Idle: 0.90 Total: 2.59 > > It looks like 0.64 represents 64%, not 0.64 percent; or whatever types > of numbers would be reported by a program such as tload. > > That said, maybe ganglia is running at too high or too low of a > nice/priority value. Or your CPU has been downclocked or something > else funky. > > -- > ~Mike > - Just my two cents > - No man is an island, and no man is unable. > > > ------------------------------------------------------- > This SF.Net email is sponsored by: > Power Architecture Resource Center: Free content, downloads, discussions, > and more. http://solutions.newsforge.com/ibmarch.tmpl > _______________________________________________ > Ganglia-general mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/ganglia-general
