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[Java JVM - Print Flags Related To Periodic GC]JVM GC Added Periodic GC Option to Some GC Algorithms #java #jvm #gc
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| #!/bin/bash | |
| # | |
| # check for JVM flags pertaining periodic GC (uncommit, periodic, Shenandoa) | |
| java -XX:+PrintFlagsFinal -version | grep -iE "uncommit|periodic|Shenandoa" | |
| # and to show the JVM and OS settings as well the JVM version | |
| java -XshowSettings:all -version | |
| # testing with java8, java11 and java17 | |
| /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java -XX:+PrintFlagsFinal -version | grep -iE "uncommit|periodic|Shenandoa" | |
| /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -XX:+PrintFlagsFinal -version | grep -iE "uncommit|periodic|Shenandoa" | |
| ~/.linuxbrew/bin/java -XX:+PrintFlagsFinal -version | grep -iE "uncommit|periodic|Shenandoa" | |
| # Output Example | |
| # | |
| # $ /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java -XX:+PrintFlagsFinal -version | grep -iE "uncommit|periodic|Shenandoa" | |
| # OpenJDK Runtime Environment (build 1.8.0_292-8u292-b10-0ubuntu1~20.04-b10) | |
| # OpenJDK 64-Bit Server VM (build 25.292-b10, mixed mode) | |
| # | |
| # $ /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -XX:+PrintFlagsFinal -version | grep -iE "uncommit|periodic|Shenandoa" | |
| # ccstr ShenandoahGCHeuristics = adaptive {product} {default} | |
| # ccstr ShenandoahGCMode = satb {product} {default} | |
| # size_t ShenandoahSoftMaxHeapSize = 0 {manageable} {default} | |
| # bool UseShenandoahGC = false {product} {default} | |
| # openjdk version "11.0.11" 2021-04-20 | |
| # OpenJDK Runtime Environment (build 11.0.11+9-Ubuntu-0ubuntu2.20.04) | |
| # OpenJDK 64-Bit Server VM (build 11.0.11+9-Ubuntu-0ubuntu2.20.04, mixed mode, sharing) | |
| # | |
| # $ ~/.linuxbrew/bin/java -XX:+PrintFlagsFinal -version | grep -iE "uncommit|periodic|Shenandoa" | |
| # uintx G1PeriodicGCInterval = 0 {manageable} {default} | |
| # bool G1PeriodicGCInvokesConcurrent = true {product} {default} | |
| # double G1PeriodicGCSystemLoadThreshold = 0.000000 {manageable} {default} | |
| # ccstr ShenandoahGCHeuristics = adaptive {product} {default} | |
| # ccstr ShenandoahGCMode = satb {product} {default} | |
| # bool UseShenandoahGC = false {product} {default} | |
| # bool ZUncommit = true {product} {default} | |
| # uintx ZUncommitDelay = 300 {product} {default} | |
| # openjdk version "17" 2021-09-14 | |
| # OpenJDK Runtime Environment Homebrew (build 17+0) | |
| # OpenJDK 64-Bit Server VM Homebrew (build 17+0, mixed mode, sharing) | |
| # Output of java -XshowSettings:all -version | |
| # | |
| # $ /usr/lib/jvm/java-11-openjdk-amd64/bin/java -XshowSettings:all -version | |
| # VM settings: | |
| # Max. Heap Size (Estimated): 7.77G | |
| # Using VM: OpenJDK 64-Bit Server VM | |
| # | |
| # Property settings: | |
| # awt.toolkit = sun.awt.X11.XToolkit | |
| # file.encoding = UTF-8 | |
| # file.separator = / | |
| # java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment | |
| # java.awt.printerjob = sun.print.PSPrinterJob | |
| # java.class.path = | |
| # java.class.version = 55.0 | |
| # java.home = /usr/lib/jvm/java-11-openjdk-amd64 | |
| # java.io.tmpdir = /tmp | |
| # java.library.path = | |
| # /usr/lib64/openmpi/lib/ | |
| # /usr/java/packages/lib | |
| # /usr/lib/x86_64-linux-gnu/jni | |
| # /lib/x86_64-linux-gnu | |
| # /usr/lib/x86_64-linux-gnu | |
| # /usr/lib/jni | |
| # /lib | |
| # /usr/lib | |
| # java.runtime.name = OpenJDK Runtime Environment | |
| # java.runtime.version = 11.0.11+9-Ubuntu-0ubuntu2.20.04 | |
| # java.specification.name = Java Platform API Specification | |
| # java.specification.vendor = Oracle Corporation | |
| # java.specification.version = 11 | |
| # java.vendor = Ubuntu | |
| # java.vendor.url = https://ubuntu.com/ | |
| # java.vendor.url.bug = https://bugs.launchpad.net/ubuntu/+source/openjdk-lts | |
| # java.version = 11.0.11 | |
| # java.version.date = 2021-04-20 | |
| # java.vm.compressedOopsMode = Zero based | |
| # java.vm.info = mixed mode, sharing | |
| # java.vm.name = OpenJDK 64-Bit Server VM | |
| # java.vm.specification.name = Java Virtual Machine Specification | |
| # java.vm.specification.vendor = Oracle Corporation | |
| # java.vm.specification.version = 11 | |
| # java.vm.vendor = Ubuntu | |
| # java.vm.version = 11.0.11+9-Ubuntu-0ubuntu2.20.04 | |
| # jdk.debug = release | |
| # line.separator = \n | |
| # os.arch = amd64 | |
| # os.name = Linux | |
| # os.version = 5.13.0-7620-generic | |
| # path.separator = : | |
| # sun.arch.data.model = 64 | |
| # sun.boot.library.path = /usr/lib/jvm/java-11-openjdk-amd64/lib | |
| # 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 = /home/mmalva/dev/lava-feature/datacore4 | |
| # user.home = /home/mmalva | |
| # user.language = en | |
| # user.name = mmalva | |
| # user.timezone = | |
| # | |
| # Locale settings: | |
| # default locale = English (United States) | |
| # default display locale = English (United States) | |
| # default format locale = English (United States) | |
| # available locales = , af, af_NA, af_ZA, agq, agq_CM, ak, ak_GH, | |
| # am, am_ET, ar, ar_001, ar_AE, ar_BH, ar_DJ, ar_DZ, | |
| # ar_EG, ar_EH, ar_ER, ar_IL, ar_IQ, ar_JO, ar_KM, ar_KW, | |
| # ar_LB, ar_LY, ar_MA, ar_MR, ar_OM, ar_PS, ar_QA, ar_SA, | |
| # ar_SD, ar_SO, ar_SS, ar_SY, ar_TD, ar_TN, ar_YE, as, | |
| # as_IN, asa, asa_TZ, ast, ast_ES, az, az_AZ_#Cyrl, az_AZ_#Latn, | |
| # az__#Cyrl, az__#Latn, bas, bas_CM, be, be_BY, bem, bem_ZM, | |
| # bez, bez_TZ, bg, bg_BG, bm, bm_ML, bn, bn_BD, | |
| # bn_IN, bo, bo_CN, bo_IN, br, br_FR, brx, brx_IN, | |
| # bs, bs_BA_#Cyrl, bs_BA_#Latn, bs__#Cyrl, bs__#Latn, ca, ca_AD, ca_ES, | |
| # ca_ES_VALENCIA, ca_FR, ca_IT, ccp, ccp_BD, ccp_IN, ce, ce_RU, | |
| # cgg, cgg_UG, chr, chr_US, ckb, ckb_IQ, ckb_IR, cs, | |
| # cs_CZ, cu, cu_RU, cy, cy_GB, da, da_DK, da_GL, | |
| # dav, dav_KE, de, de_AT, de_BE, de_CH, de_DE, de_IT, | |
| # de_LI, de_LU, dje, dje_NE, dsb, dsb_DE, dua, dua_CM, | |
| # dyo, dyo_SN, dz, dz_BT, ebu, ebu_KE, ee, ee_GH, | |
| # ee_TG, el, el_CY, el_GR, en, en_001, en_150, en_AG, | |
| # en_AI, en_AS, en_AT, en_AU, en_BB, en_BE, en_BI, en_BM, | |
| # en_BS, en_BW, en_BZ, en_CA, en_CC, en_CH, en_CK, en_CM, | |
| # en_CX, en_CY, en_DE, en_DG, en_DK, en_DM, en_ER, en_FI, | |
| # en_FJ, en_FK, en_FM, en_GB, en_GD, en_GG, en_GH, en_GI, | |
| # en_GM, en_GU, en_GY, en_HK, en_IE, en_IL, en_IM, en_IN, | |
| # en_IO, en_JE, en_JM, en_KE, en_KI, en_KN, en_KY, en_LC, | |
| # en_LR, en_LS, en_MG, en_MH, en_MO, en_MP, en_MS, en_MT, | |
| # en_MU, en_MW, en_MY, en_NA, en_NF, en_NG, en_NL, en_NR, | |
| # en_NU, en_NZ, en_PG, en_PH, en_PK, en_PN, en_PR, en_PW, | |
| # en_RW, en_SB, en_SC, en_SD, en_SE, en_SG, en_SH, en_SI, | |
| # en_SL, en_SS, en_SX, en_SZ, en_TC, en_TK, en_TO, en_TT, | |
| # en_TV, en_TZ, en_UG, en_UM, en_US, en_US_POSIX, en_VC, en_VG, | |
| # en_VI, en_VU, en_WS, en_ZA, en_ZM, en_ZW, eo, eo_001, | |
| # es, es_419, es_AR, es_BO, es_BR, es_BZ, es_CL, es_CO, | |
| # es_CR, es_CU, es_DO, es_EA, es_EC, es_ES, es_GQ, es_GT, | |
| # es_HN, es_IC, es_MX, es_NI, es_PA, es_PE, es_PH, es_PR, | |
| # es_PY, es_SV, es_US, es_UY, es_VE, et, et_EE, eu, | |
| # eu_ES, ewo, ewo_CM, fa, fa_AF, fa_IR, ff, ff_CM, | |
| # ff_GN, ff_MR, ff_SN, fi, fi_FI, fil, fil_PH, fo, | |
| # fo_DK, fo_FO, fr, fr_BE, fr_BF, fr_BI, fr_BJ, fr_BL, | |
| # fr_CA, fr_CD, fr_CF, fr_CG, fr_CH, fr_CI, fr_CM, fr_DJ, | |
| # fr_DZ, fr_FR, fr_GA, fr_GF, fr_GN, fr_GP, fr_GQ, fr_HT, | |
| # fr_KM, fr_LU, fr_MA, fr_MC, fr_MF, fr_MG, fr_ML, fr_MQ, | |
| # fr_MR, fr_MU, fr_NC, fr_NE, fr_PF, fr_PM, fr_RE, fr_RW, | |
| # fr_SC, fr_SN, fr_SY, fr_TD, fr_TG, fr_TN, fr_VU, fr_WF, | |
| # fr_YT, fur, fur_IT, fy, fy_NL, ga, ga_IE, gd, | |
| # gd_GB, gl, gl_ES, gsw, gsw_CH, gsw_FR, gsw_LI, gu, | |
| # gu_IN, guz, guz_KE, gv, gv_IM, ha, ha_GH, ha_NE, | |
| # ha_NG, haw, haw_US, hi, hi_IN, hr, hr_BA, hr_HR, | |
| # hsb, hsb_DE, hu, hu_HU, hy, hy_AM, ig, ig_NG, | |
| # ii, ii_CN, in, in_ID, is, is_IS, it, it_CH, | |
| # it_IT, it_SM, it_VA, iw, iw_IL, ja, ja_JP, ja_JP_JP_#u-ca-japanese, | |
| # jgo, jgo_CM, ji, ji_001, jmc, jmc_TZ, ka, ka_GE, | |
| # kab, kab_DZ, kam, kam_KE, kde, kde_TZ, kea, kea_CV, | |
| # khq, khq_ML, ki, ki_KE, kk, kk_KZ, kkj, kkj_CM, | |
| # kl, kl_GL, kln, kln_KE, km, km_KH, kn, kn_IN, | |
| # ko, ko_KP, ko_KR, kok, kok_IN, ks, ks_IN, ksb, | |
| # ksb_TZ, ksf, ksf_CM, ksh, ksh_DE, kw, kw_GB, ky, | |
| # ky_KG, lag, lag_TZ, lb, lb_LU, lg, lg_UG, lkt, | |
| # lkt_US, ln, ln_AO, ln_CD, ln_CF, ln_CG, lo, lo_LA, | |
| # lrc, lrc_IQ, lrc_IR, lt, lt_LT, lu, lu_CD, luo, | |
| # luo_KE, luy, luy_KE, lv, lv_LV, mas, mas_KE, mas_TZ, | |
| # mer, mer_KE, mfe, mfe_MU, mg, mg_MG, mgh, mgh_MZ, | |
| # mgo, mgo_CM, mk, mk_MK, ml, ml_IN, mn, mn_MN, | |
| # mr, mr_IN, ms, ms_BN, ms_MY, ms_SG, mt, mt_MT, | |
| # mua, mua_CM, my, my_MM, mzn, mzn_IR, naq, naq_NA, | |
| # nb, nb_NO, nb_SJ, nd, nd_ZW, nds, nds_DE, nds_NL, | |
| # ne, ne_IN, ne_NP, nl, nl_AW, nl_BE, nl_BQ, nl_CW, | |
| # nl_NL, nl_SR, nl_SX, nmg, nmg_CM, nn, nn_NO, nnh, | |
| # nnh_CM, no, no_NO, no_NO_NY, nus, nus_SS, nyn, nyn_UG, | |
| # om, om_ET, om_KE, or, or_IN, os, os_GE, os_RU, | |
| # pa, pa_IN_#Guru, pa_PK_#Arab, pa__#Arab, pa__#Guru, pl, pl_PL, prg, | |
| # prg_001, ps, ps_AF, pt, pt_AO, pt_BR, pt_CH, pt_CV, | |
| # pt_GQ, pt_GW, pt_LU, pt_MO, pt_MZ, pt_PT, pt_ST, pt_TL, | |
| # qu, qu_BO, qu_EC, qu_PE, rm, rm_CH, rn, rn_BI, | |
| # ro, ro_MD, ro_RO, rof, rof_TZ, ru, ru_BY, ru_KG, | |
| # ru_KZ, ru_MD, ru_RU, ru_UA, rw, rw_RW, rwk, rwk_TZ, | |
| # sah, sah_RU, saq, saq_KE, sbp, sbp_TZ, sd, sd_PK, | |
| # se, se_FI, se_NO, se_SE, seh, seh_MZ, ses, ses_ML, | |
| # sg, sg_CF, shi, shi_MA_#Latn, shi_MA_#Tfng, shi__#Latn, shi__#Tfng, si, | |
| # si_LK, sk, sk_SK, sl, sl_SI, smn, smn_FI, sn, | |
| # sn_ZW, so, so_DJ, so_ET, so_KE, so_SO, sq, sq_AL, | |
| # sq_MK, sq_XK, sr, sr_BA, sr_BA_#Cyrl, sr_BA_#Latn, sr_CS, sr_ME, | |
| # sr_ME_#Cyrl, sr_ME_#Latn, sr_RS, sr_RS_#Cyrl, sr_RS_#Latn, sr_XK_#Cyrl, sr_XK_#Latn, sr__#Cyrl, | |
| # sr__#Latn, sv, sv_AX, sv_FI, sv_SE, sw, sw_CD, sw_KE, | |
| # sw_TZ, sw_UG, ta, ta_IN, ta_LK, ta_MY, ta_SG, te, | |
| # te_IN, teo, teo_KE, teo_UG, tg, tg_TJ, th, th_TH, | |
| # th_TH_TH_#u-nu-thai, ti, ti_ER, ti_ET, tk, tk_TM, to, to_TO, | |
| # tr, tr_CY, tr_TR, tt, tt_RU, twq, twq_NE, tzm, | |
| # tzm_MA, ug, ug_CN, uk, uk_UA, ur, ur_IN, ur_PK, | |
| # uz, uz_AF_#Arab, uz_UZ_#Cyrl, uz_UZ_#Latn, uz__#Arab, uz__#Cyrl, uz__#Latn, vai, | |
| # vai_LR_#Latn, vai_LR_#Vaii, vai__#Latn, vai__#Vaii, vi, vi_VN, vo, vo_001, | |
| # vun, vun_TZ, wae, wae_CH, wo, wo_SN, xog, xog_UG, | |
| # yav, yav_CM, yo, yo_BJ, yo_NG, yue, yue_CN_#Hans, yue_HK_#Hant, | |
| # yue__#Hans, yue__#Hant, zgh, zgh_MA, zh, zh_CN, zh_CN_#Hans, zh_HK, | |
| # zh_HK_#Hans, zh_HK_#Hant, zh_MO_#Hans, zh_MO_#Hant, zh_SG, zh_SG_#Hans, zh_TW, zh_TW_#Hant, | |
| # zh__#Hans, zh__#Hant, zu, zu_ZA | |
| # Operating System Metrics: | |
| # Provider: cgroupv1 | |
| # Effective CPU Count: 12 | |
| # CPU Period: 100000us | |
| # CPU Quota: -1 | |
| # CPU Shares: -1 | |
| # List of Processors, 12 total: | |
| # 0 1 2 3 4 5 6 7 8 9 10 11 | |
| # List of Effective Processors, 12 total: | |
| # 0 1 2 3 4 5 6 7 8 9 10 11 | |
| # List of Memory Nodes, 1 total: | |
| # 0 | |
| # List of Available Memory Nodes, 1 total: | |
| # 0 | |
| # CPUSet Memory Pressure Enabled: false | |
| # Memory Limit: Unlimited | |
| # Memory Soft Limit: Unlimited | |
| # Memory & Swap Limit: Unlimited | |
| # Kernel Memory Limit: Unlimited | |
| # TCP Memory Limit: Unlimited | |
| # Out Of Memory Killer Enabled: true | |
| # | |
| # openjdk version "11.0.11" 2021-04-20 | |
| # OpenJDK Runtime Environment (build 11.0.11+9-Ubuntu-0ubuntu2.20.04) | |
| # OpenJDK 64-Bit Server VM (build 11.0.11+9-Ubuntu-0ubuntu2.20.04, mixed mode, sharing) | |
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