[Gc] Boehm GC and Iphone

Damian damian.pop at gmail.com
Wed Feb 9 22:24:21 PST 2011


Just to add more info:
>From what I saw, xcode executes the following call to gcc:

setenv LANG en_US.US-ASCII
setenv PATH
"/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"

/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -x
objective-c -arch armv7 -fmessage-length=0 -pipe -std=c99 -Wno-trigraphs
-fpascal-strings -Os -mdynamic-no-pic -Wreturn-type -Wunused-variable
-isysroot
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk
-fvisibility=hidden -gdwarf-2 -miphoneos-version-min=4.1 -iquote
/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/gc-test-generated-files.hmap
-I/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/gc-test-own-target-headers.hmap
-I/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/gc-test-all-target-headers.hmap
-iquote
/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/gc-test-project-headers.hmap
-F/Users/damian/Desktop/gc-test/build/Release-iphoneos
-I/Users/damian/Desktop/gc-test/build/Release-iphoneos/include
-I/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/DerivedSources/armv7
-I/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/DerivedSources
-DNS_BLOCK_ASSERTIONS=1 -c /Users/damian/Desktop/gc-test/Classes/main.m -o
/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/Objects-normal/armv7/main.o

And the executable I get crashes. It prints "Abort trap" to the console.
I compiled the file in the command line, on the mac, using almost the same
command, just modified so it also links:

/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 libgc.a -x
objective-c -arch armv7 -fmessage-length=0 -pipe -std=c99 -Wno-trigraphs
-fpascal-strings -Os -mdynamic-no-pic -Wreturn-type -Wunused-variable
-isysroot
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk
-fvisibility=hidden -gdwarf-2 -miphoneos-version-min=4.1 -iquote
/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/gc-test-generated-files.hmap
-I/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/gc-test-own-target-headers.hmap
-I/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/gc-test-all-target-headers.hmap
-iquote
/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/gc-test-project-headers.hmap
-F/Users/damian/Desktop/gc-test/build/Release-iphoneos
-I/Users/damian/Desktop/gc-test/build/Release-iphoneos/include
-I/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/DerivedSources/armv7
-I/Users/damian/Desktop/gc-test/build/gc-test.build/Release-iphoneos/gc-test.build/DerivedSources
-DNS_BLOCK_ASSERTIONS=1 /Users/damian/Desktop/gc-test/Classes/main.m -o main

And the executable I get works, no crashes.
I don't get it. I have no idea what to do now :(

On Thu, Feb 10, 2011 at 12:35 AM, Damian <damian.pop at gmail.com> wrote:

> Hi Ivan,
>
> I've tried with your attached gc.o and it crashed exactly the same, so I've
> decided to make a few tests:
> I've setted up my ipod to be able to compile directly in it and compiled my
> simple test and it works, no crashes at all. The same source file (main.m,
> I'm attaching it), if I compile it in xcode it crashes, if I compile it in
> the ipod it works. Using the same preocompiled library libgc.a that I made
> myself compiling it in the device with the command line you wrote.
>
> So it's not a problem of the library but something related to the final
> executable, or how it's linked, or I don't know...
>
> Do you have any idea of what can be the problem?
> I'll try to find out what parameters xcode is passing to gcc and the
> linker.
>
> Thanks again.
>
> 2011/2/9 Ivan Maidanski <ivmai at mail.ru>
>
> Hi,
>>
>> The attachment contains libgc (gc.o), gctest and your runTest.
>> My development (i.e. I compiled the app directly on the device itself) and
>> target system is: iPhone 3GS
>>
>> I used the following command to compile libgc:
>> gcc -O2 -fno-strict-aliasing -Wall -DNO_EXECUTE_PERMISSION
>> -DALL_INTERIOR_POINTERS -DJAVA_FINALIZATION -DGC_GCJ_SUPPORT -DNO_DEBUGGING
>> -DGC_THREADS -DTHREAD_LOCAL_ALLOC -DPARALLEL_MARK -I include -I
>> libatomic_ops/src -c extra/gc.c
>>
>> Regards.
>>
>> Tue, 8 Feb 2011 22:06:52 -0300  Damian <damian.pop at gmail.com>:
>>
>> > :(
>> >
>> > I did what you said, moved GC_INIT(), GC_enable_incremental() and
>> runTest()
>> > directly to main()
>> > I also added the 3 defines you are using (-DNO_EXECUTE_PERMISSION
>> > -DALL_INTERIOR_POINTERS -DGC_THREADS)
>> > I've also tried building for ARMv6 and ARMv7 and both ways it crashes
>> the
>> > same.
>> >
>> > I'm not calling gcc directly, I'm calling configure and make. I send you
>> > attached the script I've used to call configure with all the parameters.
>> > Because I had to export some variables before calling it so it would
>> build
>> > for ARM and include iOS headers.
>> >
>> > Here is one of the lines is writen to the console, I think these are the
>> > parameters passed to gcc.
>> >
>> > libtool: compile:  gcc -DHAVE_CONFIG_H -I./include -I./include
>> > -I./libatomic_ops/src -I./libatomic_ops/src -fexceptions -arch armv7
>> > -DNO_EXECUTE_PERMISSION -DALL_INTERIOR_POINTERS -DGC_THREADS -isysroot
>> > /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk
>> -MT
>> > dyn_load.lo -MD -MP -MF .deps/dyn_load.Tpo -c dyn_load.c -o dyn_load.o
>> >
>> > Ivan, maybe you can send me the compiled gc that is working for you, so
>> I
>> > can test it on my device to discard that the problem is something
>> related to
>> > the device version / iOS version or something like that.
>> >
>> > Thanks!
>> > Damian
>> >
>> > 2011/2/8 Ivan Maidanski <ivmai at mail.ru>
>> >
>> > > Hi Damian,
>> > >
>> > > I can't reproduce the bug.
>> > >
>> > > Please:
>> > > 1. show me the exact command-line parameters passed to gcc.
>> > > 2. Call GC_INIT() and GC_enable_incremental() directly from main().
>> > >
>> > > I called runTest() directly from main(). I compiled GC using this
>> command
>> > > line:
>> > > gcc -fno-common -Wall -DNO_EXECUTE_PERMISSION -DALL_INTERIOR_POINTERS
>> > > -DGC_THREADS -I include -I libatomic_ops/src -c extra/gc.c
>> > >
>> > >
>> > > PS. At present, I'm modifying iphone-specific part of GC - I'll
>> release it
>> > > in several days.
>> > >
>> > > Regards.
>> > >
>> > > Sat, 29 Jan 2011 22:23:03 -0300 Damian <damian.pop at gmail.com>:
>> > >
>> > > > Hi Ivan, could you find anything about it?
>> > >
>> > > > On Fri, Jan 21, 2011 at 12:24 AM, Damian <damian.pop at gmail.com>
>> wrote:
>> > > > I'm sending you a very small test case attached. It has an xcode
>> project
>> > > too, with some automatically generated files, but the code is just
>> this:
>> > >
>> > > > void** trash;
>> > >
>> > > > void runTest() {
>> > > >  GC_INIT();
>> > > >  GC_enable_incremental(); // REMOVING THIS LINE IT WONT CRASH
>> > > >
>> > > >  trash = GC_MALLOC(sizeof(void*));
>> > > >
>> > > >  while(1){
>> > > >  *trash = GC_MALLOC(16);
>> > > >  }
>> > > > }
>> > >
>> > > > To build the GC I'm using the options: --host=arm-apple-darwin10
>> > > --enable-cplusplus=no --enable-shared=no --enable-full-debug=no
>> > > > If it helps, I added the script I'm using to build it, it's named
>> > > build-iphone.sh
>> > > > Hope it helps!
>> > >
>> > > > Damian
>> > > > 2011/1/20 Ivan Maidanski <ivmai at mail.ru>
>> > > >
>> > >
>> > > > Hello,
>> > > >
>> > > > Send the C/C++ code as an attachment. And specify the building
>> options
>> > > (or link the makefile as an attachment).
>> > > >
>> > > > Regards.
>> > > >
>> > > > Thu, 20 Jan 2011 18:23:45 -0300 Damian Troncoso <
>> damian.pop at gmail.com>:
>> > > >
>> > >
>> > > > > Sure I'll do. I can make an xcode project. Where should I upload
>> it?
>> > > > >
>> > > > > El 20/01/2011, a las 17:54, Ivan Maidanski <ivmai at mail.ru>
>> escribi?:
>> > > >
>> > > > >
>> > > > > > Hi,
>> > > > > >
>> > > > > > Would be nice if you provide a test case (as small as possible).
>> > > > > >
>> > > > > > Meanwhile, I'll run my app eating/recycling lots of memory on
>> iphone
>> > > with
>> > > > > enable incremental.
>> > > > > >
>> > > > > > Regards.
>> > > > > >
>> > > > > > Wed, 19 Jan 2011 20:34:43 -0300 Damian <damian.pop at gmail.com>:
>> > > > > >
>> > > > > >> I tried 3, 5 and 6 and nothing changed.
>> > > > > >> Yes, I'm getting the abort on the first call to exc_server, and
>> > > > > >> catch_exception_raise
>> > > > > >> is never called.
>> > > > > >>
>> > > > > >> 2011/1/19 Ivan Maidanski <ivmai at mail.ru>
>> > > > > >>
>> > > > > >>> Hi,
>> > > > > >>>
>> > > > > >>> 1. Are you getting abort on the first exc_server call?
>> > > > > >>> 2. Is catch_exception_raise called?
>> > > > > >>> 3. Try BROKEN_EXCEPTION_HANDLING
>> > > > > >>> 4. msgh_reserved is not set to any value, that's why it is
>> random.
>> > > > > >>> 5. For ID_STOP, ID_RESUME, it might be not safe to use 1, 2 -
>> try
>> > > other
>> > > > > >>> values.
>> > > > > >>> 6. Try to increase reply/msg.data size in GC_mprotect_thread.
>> > > > > >>>
>> > > > > >>> Regards.
>> > > > > >>>
>> > > > > >>> Wed, 19 Jan 2011 00:23:26 -0300 Damian <damian.pop at gmail.com
>> >:
>> > > > > >>>
>> > > > > >>>> Well I managed to debug the code.
>> > > > > >>>> I really don't get why the exception is produced, I don't
>> even
>> > > know if
>> > > > > >>> the data passed to exc_server looks good or not.
>> > > > > >>>> It's always like the following when the exception is thrown,
>> the
>> > > only
>> > > > > >>> value that changes is 'msgh_reserved':
>> > > > > >>>
>> > > > > >>>> (gdb) p msg.head</div>
>> > > > > >>>> $1 = {
>> > > > > >>>> msgh_bits = 2147488018,
>> > > > > >>>> msgh_size = 76,
>> > > > > >>>> msgh_remote_port = 6147,
>> > > > > >>>> msgh_local_port = 4611,
>> > > > > >>>> msgh_reserved = 3445996780,
>> > > > > >>>> msgh_id = 2401
>> > > > > >>>> }
>> > > > > >>>
>> > > > > >>>> The call to exc_server is like this:
>> > > > > >>>
>> > > > > >>>>
>> > > > > >>>> if(!exc_server(&msg.head, &reply.head))
>> > > > > >>>> ABORT("exc_server failed");
>> > > > > >>>
>> > > > > >>>> msg.head is filled with a call to mach_msg, like this:
>> > > > > >>>
>> > > > > >>>>
>> > > > > >>>> r = mach_msg(&msg.head, MACH_RCV_MSG | MACH_RCV_LARGE |
>> > > > > >>>> (GC_mprotect_state == GC_MP_DISCARDING ? MACH_RCV_TIMEOUT :
>> 0),
>> > > > > >>>> 0, sizeof(msg), GC_ports.exception,
>> > > > > >>>> GC_mprotect_state == GC_MP_DISCARDING ? 0
>> > > > > >>>> : MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
>> > > > > >>>
>> > > > > >>>> I'm lost :(
>> > > > > >>>> 2011/1/18 Ivan Maidanski <ivmai at mail.ru>
>> > > > > >>>> Hi,
>> > > > > >>>>
>> > > > > >>>> Tue, 18 Jan 2011 03:24:33 -0300 Damian <damian.pop at gmail.com
>> >:
>> > > > > >>>>
>> > > > > >>>
>> > > > > >>>>> Hi Ivan, thanks for helping me with this.
>> > > > > >>>>> 1. I defined none of those, should I define any? (I tried
>> both
>> > > after I
>> > > > > >>> read
>> > > > > >>>>> this but I get the same exception)
>> > > > > >>>>
>> > > > > >>>> So, the problem is not there.
>> > > > > >>>>
>> > > > > >>>
>> > > > > >>>>> 2. My app only runs on iphone, but I tried it in the iphone
>> > > simulator
>> > > > > >>> and it
>> > > > > >>>>> does not crash. I built the gc just like for the simulator
>> but
>> > > for x86
>> > > > > >>>>
>> > > > > >>>>> arch and it seems to work.
>> > > > > >>>>
>> > > > > >>>>> 3. How? How do I build the collector with symbols on? I
>> tried
>> > > adding -g
>> > > > > >>> to
>> > > > > >>>>> compiler options and I get a library more than twice bigger
>> so I
>> > > thing
>> > > > > >>> it
>> > > > > >>>>> has the symbols, but when debugging the stack is the same.
>> > > > > >>>>
>> > > > > >>>> I don't know. At least, try to set a break point at exc_sever
>> and
>> > > watch
>> > > > > >>> what is passed to it.
>> > > > > >>>>
>> > > > > >>>> Regards.
>> > > > > >>>>
>> > > > > >>>
>> > > > > >>>>>
>> > > > > >>>>> Thanks again!
>> > > > > >>>>> Damian
>> > > > > >>>>>
>> > > > > >>>>> 2011/1/17 Ivan Maidanski <ivmai at mail.ru>
>> > > > > >>>>>
>> > > > > >>>>>> Hi Damian,
>> > > > > >>>>>>
>> > > > > >>>>>> 1. Is the mode is GC_DISCOVER_TASK_THREADS or
>> > > > > >>> GC_NO_THREADS_DISCOVERY?
>> > > > > >>>>>> 2. Could you try your app on Mac OS X?
>> > > > > >>>>>> 3. Could you debug with symbols on and tell us the reason
>> of
>> > > abort
>> > > > > >>> call?
>> > > > > >>>>>> 4. GC_get_parallel() returns non-zero if 2 or more markers
>> are
>> > > > > >>> running.
>> > > > > >>>>>> 5. Incremental/generation mode is turned on only if either
>> > > > > >>>>>> GC_enable_incremental() is called (unless
>> GC_DISABLE_INCREMENTAL
>> > > env
>> > > > > >>> var is
>> > > > > >>>>>> set) or GC_ENABLE_INCREMENTAL env var is set.
>> > > > > >>>>>>
>> > > > > >>>>>> Regards.
>> > > > > >>>>>>
>> > > > > >>>>>> Sun, 16 Jan 2011 01:18:05 -0300 Damian <
>> damian.pop at gmail.com>:
>> > > > > >>>>>>
>> > > > > >>>>>>> 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
>> > > > > >>>>>>
>> > > > > >>>>>>
>> > > > > >>>>>
>> > > > > >>>>
>> > > > > >>>>> _______________________________________________
>> > > > > >>>>> Gc mailing list
>> > > > > >>>>> Gc at linux.hpl.hp.com
>> > > > > >>>>> http://www.hpl.hp.com/hosted/linux/mail-archives/gc/
>> > > > > >>>>
>> > > > > >>>>
>> > > > > >>>> _______________________________________________
>> > > > > >>>> Gc mailing list
>> > > > > >>>> Gc at linux.hpl.hp.com
>> > > > > >>>> http://www.hpl.hp.com/hosted/linux/mail-archives/gc/
>> > > > > >>>>
>> > > > > >>>
>> > > > > >>>
>> > > > > >>
>> > > > > >> _______________________________________________
>> > > > > >> Gc mailing list
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>> > > > > >> http://www.hpl.hp.com/hosted/linux/mail-archives/gc/
>> > > > > >
>> > > >
>> > > >
>> > > >
>> > > > _______________________________________________
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>> > > >
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>> > >
>>
>>
>
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