Hi Sam, Generally, Ganglia gives usage of CPU, Memory, Disk and Network of the whole cluster while visual VM shows CPU and Memory metrics per JVM.
If the topology is the only running job on your cluster, Ganglia will let you know whether your topology has fully utilized the resources of the cluster and where the bottleneck is. For example, is the CPU abnormally high for very simple logics ? is the GbE network already full ? With visual VM, you might be able to pinpoint the problem. It shows the CPU condition of each thread at runtime, whether it's running, sleeping or blocking and the thread can be dumped. Plus, you can also do sampling or profiling for CPU / memory which can help you to find the hot spots in your code. Hope this helps. Regards, Manu On Sun, Apr 24, 2016 at 3:20 PM sam mohel <sammoh...@gmail.com> wrote: > Can anybody help ? > > On Saturday, April 23, 2016, sam mohel <sammoh...@gmail.com> wrote: > > > I submitted topology and want to measure performance of CPU by like > > getting graph > > > > Can I use ganglia ? or visual VM can do it ? > > > > Iam using storm -0.9.6 and it has already visulaization for spout and > > bolts . how can I understand it well ? I don't understand numbers that > > appeared in the graph . and how can I use it in evaluation of toplogy > > > > Thanks for any help > > >
