What are the best JVM settings for Eclipse? -

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what best jvm settings have found running eclipse?

it time of year again: "eclipse.ini take 3" settings strike back!

eclipse helios 3.6 , 3.6.x settings

alt text http://www.eclipse.org/home/promotions/friends-helios/helios.png

after settings eclipse ganymede 3.4.x , eclipse galileo 3.5.x, here in-depth @ "optimized" eclipse.ini settings file eclipse helios 3.6.x:

(by "optimized", mean able run full-fledge eclipse on our crappy workstation @ work, old p4 2002 2go ram , xpsp3. have tested same settings on windows7)

eclipse.ini

alt text

warning: non-windows platform, use sun proprietary option -xx:maxpermsize instead of eclipse proprietary option --launcher.xxmaxpermsize.
is: unless using latest jdk6u21 build 7. see oracle section below.

-data ../../workspace -showlocation -showsplash org.eclipse.platform --launcher.defaultaction openfile -vm c:/prog/java/jdk1.6.0_21/jre/bin/server/jvm.dll -vmargs -dosgi.requiredjavaversion=1.6 -declipse.p2.unsignedpolicy=allow -xms128m -xmx384m -xss4m -xx:permsize=128m -xx:maxpermsize=384m -xx:compilethreshold=5 -xx:maxgcpausemillis=10 -xx:maxheapfreeratio=70 -xx:+cmsincrementalpacing -xx:+unlockexperimentalvmoptions -xx:+useg1gc -xx:+usefastaccessormethods -dcom.sun.management.jmxremote -dorg.eclipse.equinox.p2.reconciler.dropins.directory=c:/prog/java/eclipse_addons

note:
adapt p2.reconciler.dropins.directory external directory of choice.
see so answer. idea able drop new plugins in directory independently eclipse installation.

the following sections detail in eclipse.ini file.

the dreaded oracle jvm 1.6u21 (pre build 7) , eclipse crashes

andrew niefer did alert me situation, , wrote blog post, non-standard vm argument (-xx:maxpermsize) , can cause vms other vendors not start @ all.
eclipse version of option (--launcher.xxmaxpermsize) not working new jdk (6u21, unless using 6u21 build 7, see below).

the final solution on eclipse wiki, , for helios on windows 6u21 pre build 7 only:

 (eclipse_home)/plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.0.v20100503

that's it. no setting tweak here (again, helios on windows 6u21 pre build 7).
non-windows platform, need revert sun proprietary option -xx:maxpermsize.

the issue based 1 regression: jvm identification fails due oracle rebranding in java.exe, , triggered bug 319514 on eclipse.
andrew took care of bug 320005 - [launcher] --launcher.xxmaxpermsize: issunvm should return true oracle, helios 3.6.1.
francis upton, eclipse committer, reflects on situation.

update u21b7, july, 27th:
oracle have regressed change next java 6 release , won't implement again until jdk 7.
if use jdk6u21 build 7, can revert --launcher.xxmaxpermsize (eclipse option) instead of -xx:maxpermsize (the non-standard option).
auto-detection happening in c launcher shim eclipse.exe still "sun microsystems" string, 6u21b7, work - again.

for now, still keep -xx:maxpermsize version (because have no idea when launch eclipse right jdk).

implicit `-startup` , `--launcher.library`

contrary previous settings, exact path modules not set anymore, convenient since can vary between different eclipse 3.6.x releases:

  • startup: if not specified, executable in plugins directory org.eclipse.equinox.launcher bundle highest version.
  • launcher.library: if not specified, executable looks in plugins directory appropriate org.eclipse.equinox.launcher.[platform] fragment highest version , uses shared library named eclipse_* inside.

use jdk6

the jdk6 explicitly required launch eclipse:

-dosgi.requiredjavaversion = 1.6

this so question reports positive incidence development on mac os.

+unlockexperimentalvmoptions

the following options part of of experimental options of sun jvm.

-xx:+unlockexperimentalvmoptions -xx:+useg1gc -xx:+usefastaccessormethods

they have been reported in blog post potentially speed eclipse.
see jvm options here , in official java hotspot options page.
note: detailed list of options reports usefastaccessormethods might active default.

see "update jvm":

as reminder, g1 new garbage collector in preparation jdk 7, used in version 6 release u17.

opening files in eclipse command line

see blog post andrew niefer reporting new option:

--launcher.defaultaction openfile

this tells launcher if called command line contains arguments don't start "-", arguments should treated if followed "--launcher.openfile".

eclipse myfile.txt

this kind of command line launcher receive on windows when double click file associated eclipse, or select files , choose "open with" or "send to" eclipse.

relative paths resolved first against current working directory, , second against eclipse program directory.

see bug 301033 reference. bug 4922 (october 2001, fixed 9 years later).

p2 , unsigned dialog prompt

if tired of dialog box during installation of many plugins:

alt text

, add in eclipse.ini:

-declipse.p2.unsignedpolicy=allow

see blog post chris aniszczy, , bug report 235526.

i want security research supports fact less prompts better.
people ignore things pop in flow of want done.

for 3.6, should not pop warnings in middle of flow - no matter how simplify, people ignore them.
instead, should collect problems, not install bundles problems, , instead bring user point in workflow can fixup - add trust, configure security policy more loosely, etc. called 'safe staging'.

---------- http://www.eclipse.org/home/categories/images/wiki.gif alt text http://www.eclipse.org/home/categories/images/wiki.gif alt text http://www.eclipse.org/home/categories/images/wiki.gif

additional options

those options not directly in eclipse.ini above, can come in handy if needed.

the `user.home` issue on windows7

when eclipse starts, read keystore file (where passwords kept), file located in user.home.
if reason user.home doesn't resolve full-fledge path, eclipse won't start.
raised in this question, if experience this, need redefine keystore file explicit path (no more user.home resolve @ start)

add in eclipse.ini:

-eclipse.keyring  c:\eclipse\keyring.txt

this has been tracked bug 300577, has been solve in other question.

debug mode

wait, there's more 1 setting file in eclipse.
if add eclipse.ini option:

-debug

, enable debug mode , eclipse another setting file: .options file can specify osgi options.
, great when adding new plugins through dropins folder.
add in .options file following settings, described in blog post "dropins diagnosis":

org.eclipse.equinox.p2.core/debug=true org.eclipse.equinox.p2.core/reconciler=true

p2 inform bundles found in dropins/ folder, request generated, , plan of installation. maybe not detailed explanation of happened, , went wrong, should give strong information start:

  • was bundle in plan?
  • was installation problem (p2 fault)
  • or maybe not optimal include feature?

that comes bug 264924 - [reconciler] no diagnosis of dropins problems, solves following issue like:

unzip eclipse-sdk-3.5m5-win32.zip ..../eclipse unzip mdt-ocl-sdk-1.3.0m5.zip ..../eclipse/dropins/mdt-ocl-sdk-1.3.0m5

this problematic configuration since ocl depends on emf missing.
3.5m5 provides no diagnosis of problem.

start eclipse.
no obvious problems. nothing in error log.

  • help / / plugin details shows org.eclipse.ocl.doc, not org.eclipse.ocl.
  • help / / configuration details has no (diagnostic) mention of org.eclipse.ocl.
  • help / installation / information installed software has no mention of org.eclipse.ocl.

where nice error markers?

manifest classpath

see blog post:

  • in galileo (aka eclipse 3.5), jdt started resolving manifest classpath in libraries added project’s build path. worked whether library added project’s build path directly or via classpath container, such user library facility provided jdt or 1 implemented third party.
  • in helios, behavior changed exclude classpath containers manifest classpath resolution.

that means of projects might no longer compile in helios.
if want revert galileo behavior, add:

-dresolvereferencedlibrariesforcontainers=true

see bug 305037, bug 313965 , bug 313890 references.

ipv4 stack

this so question mentions potential fix when not accessing plugin update sites:

-djava.net.preferipv4stack=true

mentioned here in case in configuration.

jvm1.7x64 potential optimizations

this article reports:

for record, fastest options have found far bench test 1.7 x64 jvm n windows are: 

-xincgc  -xx:-dontcompilehugemethods  -xx:maxinlinesize=1024   -xx:freqinlinesize=1024

but still working on it...


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