Client VM for 64 bit linux

[David Holmes]

On 28/12/2012 6:26 AM, Helbrass wrote:
> Hi Phil,
>
> First of all, you're always building both server and client for 32 bit,
> what's the big deal with always building it for 64 bit?

Time and space.

But the main point here is that 64-bit client VM is not a supported VM 
configuration. As discussed in the past you can easily modify things to 
build this yourself for your own usage.

In the new build system you only get the VMs that you ask for at 
configure time. So I'm not opposed to changes that simply make it 
possible to ask for the 64-bit client VM (perhaps with a suitable 
warning that it is unsupported?). But it can never be a default as long 
as it is an unsupported configuration.

David
-----

>
> Second, I'm agree that in most cases server VM may be better, but in my
> case I'm programmer, not server administrator, and all day long I'm
> using NetBeans (which is awesome!). And it happened, that NetBeans
> cannot open full OpenJDK project on 64 bit VM because it fails with
> OutOfMemory, and when you're giving him 3GB RAM it still takes huge
> amount of time to scan everything. While on 32 bit client vm it works
> without any problems whatsoever. Unfortunately, I don't know hotspot
> internals to explain why this is happening, but still, cold start on 32
> bit client takes NetBeans 3 seonds, and cold start on 32 bit server vm
> takes 12 seconds. You'll say it's just 10 seconds difference, I'd say
> it's 4 times difference.
>
> I agree that this is minor issue, and openjdk developer team would not
> want to take any responsibilities for this, but for me personally it's
> just a possibility to get client openjdk vm without doing chrooted 32
> bit install of full linux.
>
> On Thu, 27 Dec 2012 20:13:46 +0200, Phil Race <philip.race at oracle.com>
> wrote:
>
>> I am fairly sure we do not want the build system to spit out a 64 bit
>> client VM by default.
>> My recollection from many years ago is that the VM team and
>> performance team determined
>> that the 64 bit server VM was as good as, or better than the 64 bit
>> client VM on all the
>> metrics that mattered and thus there was no reason for the 64 bit
>> client VM to be
>> supported.
>>
>> If you want an option to enable it that's one thing, but below it
>> looks like its always
>> built. Release engineering, product management, SQE and others will
>> object.
>>
>> -phil.
>>
>> On 12/27/2012 1:14 AM, Aekold Helbrass wrote:
>>> Hi David,
>>>
>>> Thanx for your answer. Yes, patches are really small, I hope they
>>> will not
>>> be crippled by email renderer. See patches below.
>>>
>>> And about new build system, can you please link me where can I read more
>>> about it?
>>>
>>> #######################################################################################
>>>
>>> #######################################################################################
>>>
>>> ### APPLY THIS PATCH ONTO HOTSPOT SUBFOLDER
>>> ###########################################
>>> #######################################################################################
>>>
>>> #######################################################################################
>>>
>>> Index: make/Makefile
>>> --- make/Makefile Base (BASE)
>>> +++ make/Makefile Locally Modified (Based On LOCAL)
>>> @@ -183,14 +183,10 @@
>>> @$(ECHO) "No compiler1 ($(VM_TARGET)) for
>>> ARCH_DATA_MODEL=$(ARCH_DATA_MODEL)"
>>> endif
>>> else
>>> - ifeq ($(ARCH_DATA_MODEL), 32)
>>> $(CD) $(OUTPUTDIR); \
>>> $(MAKE) -f $(ABS_OS_MAKEFILE) \
>>> $(MAKE_ARGS) $(VM_TARGET)
>>> - else
>>> - @$(ECHO) "No compiler1 ($(VM_TARGET)) for
>>> ARCH_DATA_MODEL=$(ARCH_DATA_MODEL)"
>>> endif
>>> -endif
>>>
>>> # Build compiler2 (server) rule, different for platforms
>>> generic_build2:
>>> Index: make/linux/makefiles/defs.make
>>> --- make/linux/makefiles/defs.make Base (BASE)
>>> +++ make/linux/makefiles/defs.make Locally Modified (Based On LOCAL)
>>> @@ -116,15 +116,10 @@
>>>
>>> # On 32 bit linux we build server and client, on 64 bit just server.
>>> ifeq ($(JVM_VARIANTS),)
>>> - ifeq ($(ARCH_DATA_MODEL), 32)
>>> JVM_VARIANTS:=client,server
>>> JVM_VARIANT_CLIENT:=true
>>> JVM_VARIANT_SERVER:=true
>>> - else
>>> - JVM_VARIANTS:=server
>>> - JVM_VARIANT_SERVER:=true
>>> endif
>>> -endif
>>>
>>> # determine if HotSpot is being built in JDK6 or earlier version
>>>
>>>
>>>
>>> #######################################################################################
>>>
>>> #######################################################################################
>>>
>>> ### APPLY THIS PATCH ONTO JDK SUBFOLDER
>>> ###############################################
>>> #######################################################################################
>>>
>>> #######################################################################################
>>>
>>> Index: make/java/redist/Makefile
>>> --- make/java/redist/Makefile Base (BASE)
>>> +++ make/java/redist/Makefile Locally Modified (Based On LOCAL)
>>> @@ -109,7 +109,6 @@
>>>
>>> # Hotspot client is only available on 32-bit non-Zero builds
>>> ifneq ($(ZERO_BUILD), true)
>>> -ifeq ($(ARCH_DATA_MODEL), 32)
>>> IMPORT_LIST += $(LIB_LOCATION)/$(CLIENT_LOCATION)/$(JVM_NAME) \
>>> $(LIB_LOCATION)/$(CLIENT_LOCATION)/Xusage.txt
>>> ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
>>> @@ -126,7 +125,6 @@
>>> endif
>>> endif
>>> endif
>>> -endif
>>>
>>> ifeq ($(PLATFORM), windows)
>>> # Windows vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv Windows
>>> @@ -159,7 +157,6 @@
>>>
>>> # Add .map and .pdb files to the import path for client and kernel VMs.
>>> # These are only available on 32-bit windows builds.
>>> -ifeq ($(ARCH_DATA_MODEL), 32)
>>> ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
>>> ifeq ($(ZIP_DEBUGINFO_FILES),1)
>>> # the import JDK may not contain .diz files
>>> @@ -190,7 +187,6 @@
>>> endif
>>> endif
>>> endif
>>> -endif
>>>
>>> $(LIBDIR)/$(JVMLIB_NAME): $(HOTSPOT_LIB_PATH)/$(JVMLIB_NAME)
>>> $(install-import-file)
>>> @@ -311,7 +307,6 @@
>>> endif
>>>
>>> ifneq ($(ZERO_BUILD), true)
>>> -ifeq ($(ARCH_DATA_MODEL), 32)
>>>
>>> IMPORT_LIST += $(LIB_LOCATION)/$(CLIENT_LOCATION)/$(LIBJSIG_NAME)
>>> ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
>>> @@ -423,8 +418,6 @@
>>> # solaris ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ solaris
>>> endif # 32bit solaris
>>>
>>> -endif # 32bit
>>> -
>>> endif # ZERO_BUILD
>>>
>>> # NOT Windows ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ NOT
>>> Windows
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Thu, Dec 27, 2012 at 12:06 AM, David
>>> Holmes<david.holmes at oracle.com>wrote:
>>>
>>>> Hi,
>>>>
>>>> Attachments get stripped by the mailing software. If the patches are
>>>> small
>>>> enough please include them inline, else post them somewhere accessible.
>>>> Changes would be needed for both the old and new build systems.
>>>>
>>>> Thanks,
>>>> David Holmes
>>>>
>>>>
>>>> On 27/12/2012 1:56 AM, Aekold Helbrass wrote:
>>>>
>>>>> Hi All,
>>>>>
>>>>> So, last time when I asked about 64 bit ClientVM someone explained
>>>>> me that
>>>>> it's fully compatible, just not build.
>>>>>
>>>>> I've made 2 patches to build system to build 64 bit client VM for
>>>>> linux.
>>>>> Unfortunately I do not have windows installation to check if it works
>>>>> there, but on linux it works fine, runs NetBeans without problems,
>>>>> and for
>>>>> NetBeans difference between 32 and 64 is huge: 4 seconds cold start
>>>>> against
>>>>> 13 seconds cold start.
>>>>>
>>>>> Please see 2 files in attachment, they should be applied to hotspot
>>>>> and
>>>>> jdk
>>>>> repositories.
>>>>>
>>>>> Regards!
>>>>>
>>
>
>