[ovirt-devel] Introducing engine micro-benchmarks

[Juan Hernández]

On 03/23/2017 11:05 AM, Roy Golan wrote:
> Lately we came across an interesting case where multi-host+mult-networks
> resulted editing a host to conclude in minutes. One assumption that was
> raised which we wanted to eliminate was that the decryption we perform
> on a fence agent password might be taking too long.
> 
> So these days it's an easy task thanks to JMH[1], supplied by the jdk
> itself. I kickstarted [2] and added a 'DecryptionBenchmark', see the
> output as an example[3]
> 
> Although The JMH project recommends to create a separate project I find
> it would be less trivial to people to contribute benchmarks let alone
> just playing around with current code they want to test.
> 
> - So, (when it will be merged) you add your benchmark under
>  backend/manager/modules/benchmarks/MyBenchmark.java
> 
> - run it from intellij using the jmh plugin exactly like a unit-test
> OR
> - mvn test -P benchmarks -pl org.ovirt.engine:benchmarks
> OR
> - java -jar benchmarks.jar
> 
> I hope this would serve all of us well, please review and add your
> benchmarks.
> 
> PS - this will not run in the CI atm.
> 
> [1] http://openjdk.java.net/projects/code-tools/jmh/
> [2] https://gerrit.ovirt.org/74537 microbenchmarks: Introduce
> microbenchmarks using JMH
> [3] DecryptionBenchmark output (short version):
> 
> # Run complete. Total time: 00:09:06
> 
> Benchmark                             Mode  Samples    Score  Score error  Units
> b.DecryptionBenchmark.decryption     thrpt       50  101.258        1.270  ops/s
> b.DecryptionBenchmark.encryption     thrpt       50  238.587        4.667  ops/s
> b.DecryptionBenchmark.decryption      avgt       50    0.010        0.000   s/op
> b.DecryptionBenchmark.encryption      avgt       50    0.004        0.000   s/op
> b.DecryptionBenchmark.decryption    sample     5544    0.010        0.000   s/op
> b.DecryptionBenchmark.encryption    sample    13067    0.004        0.000   s/op
> b.DecryptionBenchmark.decryption        ss       50    0.014        0.001      s
> b.DecryptionBenchmark.encryption        ss       50    0.009        0.001      s
> 
> Process finished with exit code 0
> 

Very interesting Roy, thanks.

What was the root cause of the host edit taking minutes?