Ping!! Re: RFR: 8203357 Container Metrics

[David Holmes]

Sorry Bob I haven't had a chance to look at this detail.

For the Java code ... methods that return arrays should return 
zero-length arrays when something is not available rather than null.

For getCpuPeriod() the term "operating system time slice" can be 
misconstrued as being related to the scheduler timeslice that may, or 
may not, exist, depending on the scheduler and scheduling policy etc. 
This "timeslice" is something specific to cgroups - no?

David

On 8/06/2018 3:43 AM, Bob Vandette wrote:
> Can I get one more reviewer for this RFE so I can integrate it?
> 
>> http://cr.openjdk.java.net/~bobv/8203357/webrev.01
> 
> Mandy Chung has reviewed this change.
> 
> I’ve run Mach5 hotspot and core lib tests.
> 
> I’ve reviewed the tests which were written by Harsha Wardhana
> 
> I filed a CSR for the command line change and it’s now approved and closed.
> 
> Thanks,
> Bob.
> 
> 
>> On May 30, 2018, at 3:45 PM, Bob Vandette <bob.vandette at oracle.com> wrote:
>>
>> Please review the following RFE which adds an internal API, along with jtreg tests that provide
>> access to Docker container configuration data and metrics.  In addition to the API which we hope to
>> take advantage of in the future with Java Flight Recorder and a JMX Mbean, I’ve added an additional
>> option to -XshowSettings:system than dumps out the container or host cgroup confguration
>> information.  See the sample output below:
>>
>> RFE: Container Metrics
>>
>> https://bugs.openjdk.java.net/browse/JDK-8203357
>>
>> WEBREV:
>>
>> http://cr.openjdk.java.net/~bobv/8203357/webrev.01
>>
>>
>> This commit will also include a fix for the following bug.
>>
>> BUG: [TESTBUG] Test /runtime/containers/cgroup/PlainRead.java fails
>>
>> https://bugs.openjdk.java.net/browse/JDK-8203691
>>
>> WEBREV:
>>
>> http://cr.openjdk.java.net/~bobv/8203357/webrev.00/test/hotspot/jtreg/runtime/containers/cgroup/PlainRead.java.sdiff.html
>>
>> SAMPLE USAGE and OUTPUT:
>>
>> docker run —memory=256m --cpuset-cpus 4-7 -it ubuntu bash
>> ./java -XshowSettings:system
>> Operating System Metrics:
>>     Provider: cgroupv1
>>     Effective CPU Count: 4
>>     CPU Period: 100000
>>     CPU Quota: -1
>>     CPU Shares: -1
>>     List of Processors, 4 total:
>>     4 5 6 7
>>     List of Effective Processors, 4 total:
>>     4 5 6 7
>>     List of Memory Nodes, 2 total:
>>     0 1
>>     List of Available Memory Nodes, 2 total:
>>     0 1
>>     CPUSet Memory Pressure Enabled: false
>>     Memory Limit: 256.00M
>>     Memory Soft Limit: Unlimited
>>     Memory & Swap Limit: 512.00M
>>     Kernel Memory Limit: Unlimited
>>     TCP Memory Limit: Unlimited
>>     Out Of Memory Killer Enabled: true
>>
>> TEST RESULTS:
>>
>> testing runtime container APIs
>> Directory "JTwork" not found: creating
>> Passed: runtime/containers/cgroup/PlainRead.java
>> Passed: runtime/containers/docker/DockerBasicTest.java
>> Passed: runtime/containers/docker/TestCPUAwareness.java
>> Passed: runtime/containers/docker/TestCPUSets.java
>> Passed: runtime/containers/docker/TestMemoryAwareness.java
>> Passed: runtime/containers/docker/TestMisc.java
>> Test results: passed: 6
>> Results written to /export/users/bobv/jdk11/build/jtreg/JTwork
>>
>> testing jdk.internal.platform APIs
>> Passed: jdk/internal/platform/cgroup/TestCgroupMetrics.java
>> Passed: jdk/internal/platform/docker/TestDockerCpuMetrics.java
>> Passed: jdk/internal/platform/docker/TestDockerMemoryMetrics.java
>> Passed: jdk/internal/platform/docker/TestSystemMetrics.java
>> Test results: passed: 4
>> Results written to /export/users/bobv/jdk11/build/jtreg/JTwork
>>
>> testing -XshowSettings:system launcher option
>> Passed: tools/launcher/Settings.java
>> Test results: passed: 1
>>
>>
>> Bob.
>>
>>
>