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On 06/24/2014 02:24 AM, coperd wrote: > > It is supposed that the VM’s disk “rd_bytes" and “wr_bytes" should never exceed the value of the physical disk respectively, right ? That's a question for the qemu folks. > Doesn’t > libvirt virDomainBlockStats read disk information from “proc” ? No, libvirt reads it from the qemu QMP command query-blockstats. Beyond that,

On 06/25/2014 05:11 AM, coperd wrote: [please don't top-post on technical lists] > Command line "virsh domblkstat $vmname vda” get the results below: > vda rd_bytes 639415808 > vda wr_bytes 728186880 > > Command line "cat /proc/4438/io” get the result below: > read_bytes: 772415488 > write_bytes: 734040064 Bear in mind that for some file formats, such as

Just to clarify my problems: For each KVM virtual machine, it is actually a process running on the host. The $pid in "/proc/$pid/io" represents the VM process’s PID. All my work is done on the host, not inside the VMs. Take the VM process’s pid is “pid”, What the /proc/$pid/io records is io statistics of the VM from the host’s perspective. I understand that qemu might do some I/O

Hi, all. While monitoring KVM VMs’ disk utilisation using libvirt API “virDomainBlockStats", I find that the results acquired is not consistent with the value read from /proc/[vm_pid]/io(i only care about “rd_bytes" and “wr_bytes” fields). Since libvirt doesn’t support host level monitoring, i have to calculate the host’s disk utilisation by reading from the /proc/diskstats file.

Hello folks, i'm a R beginner and i want to put in a same plot both contour lines and persp plot. For example, fn<-function(x,y){sin(x)+2*y} #this looks like a corrugated tin roof x<-seq(from=1,to=100,by=1) #generates a list of x values to sample y<-seq(from=1,to=100,by=1) #generates a list of y values to sample z<-outer(x,y,FUN=fn) #applies the funct. across the combos of x and y persp(z) #plots without gridlines contour(z) # for contour lines i wa...

...Can anyone suggest some ways to replace the grid with contour lines, to create a 3-dimensional contour map? Thanks for any help. Here is an example of what I have so far: #to create a perspective plot; plots funct. across all combos of x and y fn<-function(x,y){sin(x)+2*y} #this looks like a corrugated tin roof x<-seq(from=1,to=100,by=1) #generates a list of x values to sample y<-seq(from=1,to=100,by=1) #generates a list of y values to sample z<-outer(x,y,FUN=fn) #applies the funct. across the combos of x and y persp(z,col='lightgray',shade=.5,border=NA,) #plots without gr...

...Can anyone suggest some ways to replace the grid with contour lines, to create a 3-dimensional contour map? Thanks for any help. Here is an example of what I have so far: #to create a perspective plot; plots funct. across all combos of x and y fn<-function(x,y){sin(x)+2*y} #this looks like a corrugated tin roof x<-seq(from=1,to=100,by=1) #generates a list of x values to sample y<-seq(from=1,to=100,by=1) #generates a list of y values to sample z<-outer(x,y,FUN=fn) #applies the funct. across the combos of x and y persp(z,col='lightgray',shade=.5,border=NA,) #plots without gr...