Base64 encoding algorithm enhancements for ppc64 ?

[Baesken, Matthias]

> Your idea would be to use the VSX for Base64 encoding using SIMD
> instructions, right?

Hi Gustavo , I haven't looked into the details yet  but thought about something like this .

> 
> BTW, I discuss from time to time with Martin, Volker, and Goetz features
> pending
> and possibly interesting to be implemented on PPC64 (like GHASH - which is
> in
> my TODO list). What do you think about creating a Wiki section, like in [1], to
> track these things?
>

Sounds like a good idea !


Best regards, Matthias



> -----Original Message-----
> From: Gustavo Romero [mailto:gromero at linux.vnet.ibm.com]
> Sent: Freitag, 20. Juli 2018 16:03
> To: Baesken, Matthias <matthias.baesken at sap.com>; Simonis, Volker
> <volker.simonis at sap.com>; ppc-aix-port-dev at openjdk.java.net
> Cc: Lindenmaier, Goetz <goetz.lindenmaier at sap.com>; Doerr, Martin
> <martin.doerr at sap.com>
> Subject: Re: Base64 encoding algorithm enhancements for ppc64 ?
> 
> Hi Matthias,
> 
> On 07/19/2018 01:05 PM, Baesken, Matthias wrote:
> > Hello, when looking into  some jtreg  test issues I came across  that  for
> x86_64  some enhancements
> >
> > to Base64 encoding   were contributed  recently .
> >
> > Please see :
> >
> > JDK-8205528 <https://bugs.openjdk.java.net/browse/JDK-8205528>
> :  Base64 encoding algorithm using AVX512 instructions
> >
> > https://bugs.openjdk.java.net/browse/JDK-8205528
> >
> > http://hg.openjdk.java.net/jdk/jdk/rev/480a96a43b62
> >
> > Do we have something similar  for  ppc64  ?
> 
> No, not currently in the PPC64 / JVM.
> Your idea would be to use the VSX for Base64 encoding using SIMD
> instructions, right?
> You probably already have references on hand, but just in case there are a
> few
> refs (on Intel - I don't know any on Power so far) on this page:
> http://0x80.pl/notesen/2016-01-12-sse-base64-encoding.html
> 
> 
> > If not do you think it's worth  doing it for  this architecture as well ?
> 
> I'm not sure. On our side I'm not aware of any workload relying heavily on
> that so I did not see any comments on it being worth to be implemented for
> PPC64.
> On Intel it looks like that it's possible to get at least a 2x improvement, so
> maybe an initial quick test could be done outside the JVM to get a feeling
> about
> it on PPC64? I can help to run/test it on POWER9. If it proves reasonable, I
> think it's a matter of available manpower to do that :)
> 
> BTW, I discuss from time to time with Martin, Volker, and Goetz features
> pending
> and possibly interesting to be implemented on PPC64 (like GHASH - which is
> in
> my TODO list). What do you think about creating a Wiki section, like in [1], to
> track these things?
> 
> 
> Best regards,
> Gustavo
> 
> [1] https://wiki.openjdk.java.net/pages/viewpage.action?pageId=13041681