Ok. So that's why I was getting 1 GB as a result. So is there any way I can get memory in used programmatically? I mean without going inside guest domain. On Aug 5, 2016 5:42 PM, "Andrea Bolognani" <abolo...@redhat.com> wrote:
> On Thu, 2016-08-04 at 20:02 +0500, Aleem Akhtar wrote: > > > > I am trying to get stats of Domains running under XEN hypervisor. > > I used Libvirt function for this purpose. I am trying to understand > > output for Memory. Domain running is Fedora-22 with 1GB Ram. Here is my > > code > > > > y = virDomainGetInfo(allDomain, &info); > > if (y == -1) > > printf("Errorl\n"); > > else { > > printf("Max Memory: %lu\n", info.maxMem); > > printf("Memory: %lu", info.memory); > > } > > > > I get output as > > > > Max Memory: 1048576 > > Memory: 1048576 > > > > Now, as per Libvirt API, info.memory should return the memory in KBytes > > used by the domain. My Question is, if info.memory returns memory used > > and my domain is using complete 100% of Max Memory or not? Also I tried > > to create Domain with memory varying from 128MB to 2GB with same effect. > > I also tried to run some applications in Domain but Memory usage return > > by given function does not change. Any help or guidance will be much > > appreciated. > > The relevant virDomainInfo field is described as > > /* the memory in KBytes used by the domain */ > unsigned long memory; > > but in this context, "used by" really means "available to". > > So the output above tells you that your Fedora guest has > 1 GB of memory available; how much of that memory is actually > being used by the guest OS is something that you can find out > by running top inside the guest. > > -- > Andrea Bolognani / Red Hat / Virtualization >
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