Thank you much! On Wednesday, September 12, 2012 1:21:20 PM UTC-4, Sean Corfield wrote: > > Here's some code we use to get memory and CPU usage in a displayable form: > > (defn- as-megabytes > "Given a sequence of byte amounts, return megabyte amounts > as string, with an M suffix." > [memory] > (map #(str (int (/ % 1024 1024)) "M") memory)) > > (defn- as-percentage > "Given a pair of values, return the percentage as a string." > [[a b]] > (str (int (* 100 (/ a b))) "%")) > > (defn- memory-bean > "Return the MemoryMXBean." > [] > (java.lang.management.ManagementFactory/getMemoryMXBean)) > > (defn- heap-usage > "Given a MemoryMXBean, return the heap memory usage." > [^java.lang.management.MemoryMXBean bean] > (.getHeapMemoryUsage bean)) > > (defn- heap-used-max > "Given heap memory usage, return a pair of used/max values." > [^java.lang.management.MemoryUsage usage] > [(.getUsed usage) (.getMax usage)]) > > (defn memory-usage > "Return percentage, used, max heap as strings." > [] > (let [used-max (-> (memory-bean) (heap-usage) (heap-used-max))] > (cons (as-percentage used-max) > (as-megabytes used-max)))) > > (defn- operating-system-bean > "Return the OperatingSystemMXBean." > [] > (java.lang.management.ManagementFactory/getOperatingSystemMXBean)) > > (defn- cpus > "Given an OSMXBean, return the number of processors." > [^java.lang.management.OperatingSystemMXBean bean] > (.getAvailableProcessors bean)) > > (defn- load-average > "Given an OSMXBean, return the load average for the last minute." > [^java.lang.management.OperatingSystemMXBean bean] > (.getSystemLoadAverage bean)) > > (defn- cpu-percentage > "Given the number of CPUs and the load-average, return the > percentage utilization as a string." > [[cpus load-average]] > (str (int (* 100 (/ load-average cpus))) "%")) > > (defn cpu-usage > "Return utilization (as a string) and number of CPUs and load average." > [] > (let [bean (operating-system-bean) > data ((juxt cpus load-average) bean)] > (cons (cpu-percentage data) > data))) > > On Wed, Sep 12, 2012 at 10:12 AM, larry google groups > <lawrenc...@gmail.com <javascript:>> wrote: > > I need to know how much memory my app is using (it is a long running > > service). I see that some people have asked about how to measue memory > use. > > Robert McIntyre asked, "get the total memory used by a data structure?" > Some > > of the answers imply that it is easy to get the total memory use of the > app > > (much easier than getting the memory used by a particular data > structure?). > > I am ignorant of the JVM. How can I find the total memory used at any > given > > moment by my app? > > > > Goal: I wrote a small app that uses Ring and Moustache and Enlive. It > lives > > on my server and runs perpetually. I worry about it crashing, or > becoming > > overloaded. I am setting up some ping services (not sure which yet, > Nagios, > > or Puppet or something) to ask the app "Are you still alive?" I've > > established a special Moustache route just for the ping. It occurred to > me > > that the ping could get some useful info, like memory, and save that to > a > > file. That would give me the a good time series about the real world > memory > > use, maybe every 5 minutes. > > > > I established the app with this JVM setting: > > > > :jvm-opts ["-Xmx4000m"] > > > > Within that limit, I'd like to know what is going on. >
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