Re: [Prevayler-discussion] Implementation PrevaylerEight

[Marcel O. <mar...@gm...>]

Hi,

Just finished testing Prevayler and p8 code with the Scalability test.
Some results:
Peak performance with prevayler, disc sync = true, 5968 transactions/second
@ 1469 threads
Peak performance with prevayler, disc sync = false, 55195
transactions/second @ 3 threads

Peak performance with p8: 31610 transactions/second @ 1 thread

Unfortunately I couldn't get P8 (or PrevaylerEight) to run at more than 1
thread in the scalability test, anything more than 1 thread and I get an
Exception. [0]

And because I felt like it, here are some results with PostgreSQL: [1]
Peak performance with postgresql, file sync = true, 2866
transactions/second @ 140 threads
Peak performance with postgresql, file sync = false, 6184
transactions/second @ 12 threads

Best,
Marcel

[0] It seems every time I run P8 with more than 1 thread I get one of these
exceptions:
java.io.NotActiveException: not in readObject invocation or fields already
read
java.io.StreamCorruptedException: invalid type code: 00
java.lang.Error: java.lang.NullPointerException at
org.prevayler.contrib.p8.Journal.copy(Journal.java:132)

[1] http://imgur.com/vQ0ZzYO



On Wed, Oct 22, 2014 at 9:46 AM, Christian Stein <sor...@gm...> wrote:

>
> On Tue, Oct 21, 2014 at 11:01 PM, Flavio W. Brasil <fwb...@gm...>
> wrote:
>
>>  Hi Christian,
>>
>> Thanks for sharing Prevayler8, it looks promising! I tried to implement
>> something similar in the past, but didn’t have time to finish.
>>
>> I think http://databen.ch could be a good tool to test the scalability
>> and correctness of the implementation. I can help with it if you want.
>>
>>
> Appreciated! Today I'll cleanup some hacks in the implementation today and
> share them on github.
> After that, I'll fork(?) databen.ch and integrate P8. ;-)
>
> Thanks and cheers,
> Christian
>
>
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