Github user ceeaspb commented on a diff in the pull request:
https://github.com/apache/brooklyn-server/pull/204#discussion_r67339178
--- Diff:
software/base/src/main/java/org/apache/brooklyn/entity/software/base/SoftwareProcessImpl.java
---
@@ -287,6 +299,89 @@ protected void postDriverStart() {
*/
protected void connectSensors() {
connectedSensors = true;
+ boolean retrieveMachineMetrics =
config().get(RETRIEVE_MACHINE_METRICS);
+ if (retrieveMachineMetrics) connectMachineSensors();
+ }
+
+ /**
+ * Adds sensors returning details about the machine the process is
running on.
+ * <p>
+ * The machine must be SSHable and running Linux.
+ */
+ protected void connectMachineSensors() {
+ Maybe<SshMachineLocation> location =
Machines.findUniqueMachineLocation(getLocations(), SshMachineLocation.class);
+ if (location.isPresent() &&
location.get().getOsDetails().isLinux()) {
+ machineSensorFeed = SshFeed.builder()
+ .entity(this)
+ .period(Duration.THIRTY_SECONDS)
+ .poll(SshPollConfig.forSensor(UPTIME)
+ .command("cat /proc/uptime")
+
.onFailureOrException(Functions.<Duration>constant(null))
+ .onSuccess(new Function<SshPollValue,
Duration>() {
+ @Override
+ public Duration apply(SshPollValue input) {
+ return Duration.seconds(
Double.valueOf( Strings.getFirstWord(input.getStdout()) ) );
+ }
+ }))
+ .poll(SshPollConfig.forSensor(LOAD_AVERAGE)
+ .command("uptime")
+ .onFailureOrException(Functions.constant(-1d))
+ .onSuccess(new Function<SshPollValue,
Double>() {
+ @Override
+ public Double apply(SshPollValue input) {
+ String loadAverage =
Strings.getFirstWordAfter(input.getStdout(), "load average:").replace(",", "");
+ return Double.valueOf(loadAverage);
+ }
+ }))
+ .poll(SshPollConfig.forSensor(CPU_USAGE)
+ .command("cat /proc/stat")
--- End diff --
@grkvlt ok thanks
on review, ps averages the cpu since process start time.
It also caps the utilisation at 99% I think even if the %age is per cpu
core, I'd have to check that though.
http://procps.cvs.sourceforge.net/viewvc/procps/procps/ps/display.c?revision=1.32&content-type=text%2Fplain
used_jiffies = buf->utime + buf->stime;
if(include_dead_children) used_jiffies += (buf->cutime + buf->cstime);
seconds = seconds_since_boot - buf->start_time / Hertz;
if(seconds) pcpu = (used_jiffies * 1000ULL / Hertz) / seconds;
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