}
PerformanceManager perfMgr = si.getPerformanceManager();
// find out the refresh rate for the virtual machine
PerfProviderSummary pps = perfMgr.queryPerfProviderSummary(vm);
int refreshRate = pps.getRefreshRate().intValue();
// retrieve all the available perf metrics for vm
PerfMetricId[] pmis = perfMgr.queryAvailablePerfMetric(
vm, null, null, refreshRate);