Java 几个有用的命令 - All Options, Memory Options, GC Options, System Properties, Thread Dump, Heap Dump

-XX:InitialHeapSize=134209344 -XX:MaxHeapSize=2147349504 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

java -XshowSettings
VM settings:
Max. Heap Size (Estimated): 1.05G
Ergonomics Machine Class: server
Using VM: Java HotSpot(TM) 64-Bit Server VM

Property settings:
awt.toolkit = sun.awt.X11.XToolkit
file.encoding = UTF-8
file.encoding.pkg = sun.io
file.separator = /
java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment
java.awt.printerjob = sun.print.PSPrinterJob
java.class.path = /XXXXX
java.class.version = 51.0
java.endorsed.dirs = /ptc/Windchill_10.2/Java/jre/lib/endorsed
java.ext.dirs = /ptc/Windchill_10.2/Java/jre/lib/ext
/usr/java/packages/lib/ext
java.home = /ptc/Windchill_10.2/Java/jre
java.io.tmpdir = /tmp
java.library.path = /usr/java/packages/lib/amd64
/usr/lib64
/lib64
/lib
/usr/lib
java.runtime.name = Java(TM) SE Runtime Environment
java.runtime.version = 1.7.0_72-b14
java.specification.name = Java Platform API Specification
java.specification.vendor = Oracle Corporation
java.specification.version = 1.7
java.vendor = Oracle Corporation
java.vendor.url = http://java.oracle.com/ java.vendor.url.bug = http://bugreport.sun.com/bugreport/ java.version = 1.7.0_72
java.vm.info = mixed mode
java.vm.name = Java HotSpot(TM) 64-Bit Server VM
java.vm.specification.name = Java Virtual Machine Specification
java.vm.specification.vendor = Oracle Corporation
java.vm.specification.version = 1.7
java.vm.vendor = Oracle Corporation
java.vm.version = 24.72-b04
line.separator = \n
os.arch = amd64
os.name = Linux
os.version = 2.6.18-371.8.1.el5
path.separator = :
sun.arch.data.model = 64
sun.boot.class.path = /ptc/Windchill_10.2/Java/jre/lib/resources.jar
/ptc/Windchill_10.2/Java/jre/lib/rt.jar
/ptc/Windchill_10.2/Java/jre/lib/sunrsasign.jar
/ptc/Windchill_10.2/Java/jre/lib/jsse.jar
/ptc/Windchill_10.2/Java/jre/lib/jce.jar
/ptc/Windchill_10.2/Java/jre/lib/charsets.jar
/ptc/Windchill_10.2/Java/jre/lib/jfr.jar
/ptc/Windchill_10.2/Java/jre/classes
sun.boot.library.path = /ptc/Windchill_10.2/Java/jre/lib/amd64
sun.cpu.endian = little
sun.cpu.isalist =
sun.desktop = gnome
sun.io.unicode.encoding = UnicodeLittle
sun.java.launcher = SUN_STANDARD
sun.jnu.encoding = UTF-8
sun.management.compiler = HotSpot 64-Bit Tiered Compilers
sun.os.patch.level = unknown
user.country = US
user.dir = /ptc/Windchill_10.2/Windchill/codebase/wt/workflow/expr
user.home = /home/wcadmin
user.language = en
user.name = wcadmin
user.timezone =

Locale settings:
default locale = English
default display locale = English (United States)
default format locale = English (United States)
available locales = ar, ar_AE, ar_BH, ar_DZ, ar_EG, ar_IQ, ar_JO, ar_KW,
ar_LB, ar_LY, ar_MA, ar_OM, ar_QA, ar_SA, ar_SD, ar_SY,
ar_TN, ar_YE, be, be_BY, bg, bg_BG, ca, ca_ES,
cs, cs_CZ, da, da_DK, de, de_AT, de_CH, de_DE,
de_LU, el, el_CY, el_GR, en, en_AU, en_CA, en_GB,
en_IE, en_IN, en_MT, en_NZ, en_PH, en_SG, en_US, en_ZA,
es, es_AR, es_BO, es_CL, es_CO, es_CR, es_DO, es_EC,
es_ES, es_GT, es_HN, es_MX, es_NI, es_PA, es_PE, es_PR,
es_PY, es_SV, es_US, es_UY, es_VE, et, et_EE, fi,
fi_FI, fr, fr_BE, fr_CA, fr_CH, fr_FR, fr_LU, ga,
ga_IE, hi_IN, hr, hr_HR, hu, hu_HU, in, in_ID,
is, is_IS, it, it_CH, it_IT, iw, iw_IL, ja,
ja_JP, ja_JP_JP_#u-ca-japanese, ko, ko_KR, lt, lt_LT, lv, lv_LV,
mk, mk_MK, ms, ms_MY, mt, mt_MT, nl, nl_BE,
nl_NL, no, no_NO, no_NO_NY, pl, pl_PL, pt, pt_BR,
pt_PT, ro, ro_RO, ru, ru_RU, sk, sk_SK, sl,
sl_SI, sq, sq_AL, sr, sr_BA, sr_BA_#Latn, sr_CS, sr_ME,
sr_ME_#Latn, sr_RS, sr_RS_#Latn, sr__#Latn, sv, sv_SE, th, th_TH,
th_TH_TH_#u-nu-thai, tr, tr_TR, uk, uk_UA, vi, vi_VN, zh,
zh_CN, zh_HK, zh_SG, zh_TW