[Gc] Boehm GC and Iphone

Damian damian.pop at gmail.com
Sat Jan 15 20:18:05 PST 2011


Well, I was not calling gc_enable_incremental() so I think it was not
enabled.
Now I added the call but the program execution is aborted with this stack
trace:

   #0  0x31cbcffc in __abort ()

#1  0x31cbd04c in abort ()

#2  0x31c91fcc in internal_catch_exception_raise ()

#3  0x31c81ea4 in _Xexception_raise ()

#4  0x31c81ab0 in exc_server ()

#5  0x00060f20 in GC_mprotect_thread ()

#6  0x31caa284 in _pthread_start ()

#7  0x31c9f2b0 in thread_start ()


Any help?
Thanks!


On Sat, Jan 15, 2011 at 8:14 PM, Damian <damian.pop at gmail.com> wrote:

> Hi, I've just built gc7.2 BDWGC for iphone device, and it's working.
> How can I make sure that generation mode is on and working?
> And, parallel mark doesn't work on single core cpus?
>
> Damian.
>
> 2011/1/13 Ivan Maidanski <ivmai at mail.ru>
>
>> Hi,
>>
>> If the platform is not multi-core then parallel-mark mode should be off
>> (either at compile time or at runtime).
>> But turning on generation mode could reduce the GC pause on a single-core.
>>
>> Regards.
>>
>> Thu, 13 Jan 2011 08:28:55 -0300 Damian <damian.pop at gmail.com>:
>> > None is multicore. Will I get an inprovement anyway?
>> > Ok, I will try to compile gc7.2 BDWGC snapshot tonight.
>> > Thanks!
>> >
>> > 2011/1/13 Ivan Maidanski <ivmai at mail.ru>
>> >
>> > > Hi,
>> > >
>> > > 1. Are you going to run it on a multi-core? (I don't know Apples
>> devices
>> > > internals deeply, so I wonder which of them have multi-core CPUs).
>> > >
>> > > 2. If you start using gc6.8 just because of the reason you mentioned,
>> I
>> > > recommend you to migrate to gc7.2 (get the recent BDWGC snapshot which
>> now
>> > > has generation plus parallel collection enabled).
>> > >
>> > > 3. Incremental/generation collection as well as parallel marking are
>> the GC
>> > > improvements aiming collection pause reduction.
>> > >
>> > > Regards.
>> > >
>> > > Wed, 12 Jan 2011 20:03:02 -0300 Damian <damian.pop at gmail.com>:
>> > >
>> > > > Maybe concurrent + parallel collection does not what I'm expecting.
>> > > > What I need to achieve is to reduce the collection pause.
>> > > > I'm using version 6.8 (because I've found somewhere on the internet
>> > > someone
>> > > > has made it work on iphone with some changes) and I'm having
>> collection
>> > > > cycles of about 120ms. I need to reduce that number. I don't care if
>> > > overall
>> > > > collection time increases as long as the app is not freezed for such
>> a
>> > > long
>> > > > time.
>> > > > Is that possible?
>> > > >
>> > > > Thanks.
>> > > >
>> > > > 2011/1/12 Ivan Maidanski <ivmai at mail.ru>
>> > > >
>> > > > > Hi,
>> > > > >
>> > > > > BTW What Apple devices has a multi-core CPU at present?
>> > > > >
>> > > > > I ran GC test on a single-core with GC_MARKERS=4 - collector
>> appears to
>> > > > > work...
>> > > > >
>> > > > > Wed, 12 Jan 2011 10:04:00 -0300 Damian <damian.pop at gmail.com>:
>> > > > >
>> > > > > > Hi,
>> > > > > > Is it possible to compile boehm gc for iphone enabling
>> generational
>> > > and
>> > > > > parallel collection?
>> > > > >
>> > > > > See the recent post by Hans.
>> > > > >
>> > > > > I try to enable generational collection on multi-cores (regardless
>> > > whether
>> > > > > this slows down the GC in average or not - anyway it is not on by
>> > > default).
>> > > > > FYI: At present, generational collection on multi-cores enabled
>> only on
>> > > > > Win32.
>> > > > >
>> > > > > Regards.
>> > > > >
>> > > > > > I will try to do so; probably I will need help, but for now al
>> least
>> > > I
>> > > > > want to know it it's possible at all.
>> > > > > > Thanks
>> > >
>> > >
>>
>>
>
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