Re: Client VM for 64 bit linux

Thu, 27 Dec 2012 12:28:50 -0800 

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? 


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.r...@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.hol...@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!






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