Re: Implementation PrevaylerEight

Hi Christian,

Very nice results. I don't know what PrevaylerEight provides in terms
of ACID guarantees. How do you compare PrevaylerEight to Prevayler in
that regard?

I believe 2s for a test run is way too little. Your numbers vary
greatly because of GC interference between runs.

The Prevayler results are still growing almost linearly with 8
threads. You have to increase the number of threads until the result
peaks out, possibly with hundreds or even thousands of threads.

Klaus

On Thu, Oct 16, 2014 at 7:13 AM, Christian Stein <[email protected]> wrote:
> Hi folks,
>
> I recently found some spare time and made the scalability test use the
> PrevaylerEight implementation. See [0] for the outline of its source. A
> single-system-wide lock facade prevayler implementation is used for
> synchronization, at the moment.
>
> The initial results are promising in terms of performance and consistency:
>
> Default Prevayler: 1511,00 operations/second (8 threads)
> PrevaylerEight implementation: 89189,50 operations/second (2 threads)
>
>
> These microbenchmarks are, especially when the consistency checks kicks in,
> very garbage collection dependent. I had to set the
> TransactionTestCheckConsistency to NO, because replaying more the 1.000.000
> transactions into the prevalent system would still be running... Ran the
> benchmark with -verbose:gc and saw after an hour that every 10 deserialized
> transactions a full GC.
>
> So, I had to lower the round duration from 20 to 2 seconds. This change
> makes the results even more dependent on the gc, jit, et al. But, now some
> results are shown. See console output at [0] and [1]. Query runs and JDBC
> runs are switched off.
>
> Next time, I'll integrate Caliper[3] to show more details.
>
> Cheers,
> Christian
>
> [0] PrevaylerEight.java
> https://gist.github.com/sormuras/3fea6f6ade327b2a4249
> [1] Result PrevaylerImpl
> https://gist.github.com/sormuras/ef279705d5838a757964
> [2] Result PrevaylerEight
> https://gist.github.com/sormuras/6f61c6af2066d5f8bf87
> [3] Caliper https://code.google.com/p/caliper/
>
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-- 
Valeu, Klaus.

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