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From "xiaoming gu" <xiaoming...@gmail.com>
Subject Re: why do_field_sorting turned off when calculating offset for fields?
Date Fri, 19 Dec 2008 08:50:44 GMT
It's worth trying. Thanks. -Xiaoming

On Fri, Dec 19, 2008 at 4:30 PM, Aleksey Shipilev <
aleksey.shipilev@gmail.com> wrote:

> Yeah, Pavel is more correct. That functionality was from very
> beginning and [1] just exposed the options to the public :) Xiaoming,
> you may try to run SPECjvm2008/DaCapo with this option turned on/off
> to measure performance impact.
>
> Thanks,
> Aleksey.
>
> On Fri, Dec 19, 2008 at 11:26 AM, Pavel Pervov <pmcfirst@gmail.com> wrote:
> > These options were always available in DRLVM, and [1] only made them
> > available for configuration from command line.
> >
> > Pavel.
> >
> > P.S. I can also recall some issues related to changing order of fields
> > which were introducing measurable preformance loss on various
> > benchmarks.
> >
> > On Fri, Dec 19, 2008 at 11:16 AM, Aleksey Shipilev
> > <aleksey.shipilev@gmail.com> wrote:
> >> Hi, Xiaoming!
> >>
> >> If I recall correctly, field sorting incurs some performance
> >> degradations on some of SPECjvm2008 benchmarks. But it helps
> >> SPECjbb2005 a lot, say +1-2%. Here's the issue [1], where these
> >> options were introduced.
> >>
> >> Thanks,
> >> Aleksey.
> >>
> >> [1] https://issues.apache.org/jira/browse/HARMONY-5040
> >>
> >> On Fri, Dec 19, 2008 at 10:25 AM, xiaoming gu <xiaoming.gu@gmail.com>
> wrote:
> >>> Hi, all. I'm studying fields' offsets these days. I find there are some
> >>> ordering operations for instance fields and static fields seperately in
> >>> assign_offsets_to_fields() in Prepare.cpp. These orderings are
> according to
> >>> field size to reduce internal fragmentation. I don't know why such
> >>> operations are turned off by default. Is there any concern I missed?
> Thanks.
> >>>
> >>> Xiaoming
> >>>
> >>> --
> >>> I believe that unarmed truth and unconditional love will have the final
> word
> >>> in reality.  --Martin Luther King Jr.
> >>>
> >>
> >
>



-- 
I believe that unarmed truth and unconditional love will have the final word
in reality.  --Martin Luther King Jr.

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