сборка продукта
го java-веб-приложения, развернутого в tomcat8 на компьютере с Linux, произошла утечка собственной памяти, я попытался определить источник утечки с помощью профилирования jemalloc, как описано здесь:https://github.com/jeffgriffith/native-jvm-leaks Вывод инструмента профилирования с дампом кучи на сервере, работающем более 24 часов:
Total: 794708494 B
789734456 99.4% 99.4% 789987533 99.4% JVM_FindSignal
3421211 0.4% 99.8% 3421211 0.4% Java_java_util_zip_ZipFile_getZipMessage
1036965 0.1% 99.9% 1036965 0.1% inflateBackEnd
262784 0.0% 100.0% 262784 0.0% __GI__dl_allocate_tls
253077 0.0% 100.0% 598675182 75.3% SUNWprivate_1.1
0 0.0% 100.0% 938397 0.1% 0x00007fb133688ef8
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0 0.0% 100.0% 6146839 0.8% 0x00007fb13369b553
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0 0.0% 100.0% 131136 0.0% 0x00007fb1336a6403
0 0.0% 100.0% 266290 0.0% 0x00007fb1336a7819
0 0.0% 100.0% 296275 0.0% 0x00007fb1336a7827
0 0.0% 100.0% 139434 0.0% 0x00007fb1336a845a
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0 0.0% 100.0% 663829 0.1% 0x00007fb1336a87f7
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0 0.0% 100.0% 2012412 0.3% 0x00007fb133929d07
0 0.0% 100.0% 159413372 20.1% 0x00007fb1339be9a5
0 0.0% 100.0% 279249 0.0% 0x00007fb1339e897b
0 0.0% 100.0% 148137 0.0% 0x00007fb133a94545
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0 0.0% 100.0% 266346 0.0% 0x00007fb133ab523b
0 0.0% 100.0% 444413 0.1% 0x00007fb133ac8727
0 0.0% 100.0% 4622703 0.6% 0x00007fb133b4c74a
0 0.0% 100.0% 270666 0.0% 0x00007fb133b91ee7
0 0.0% 100.0% 28347870 3.6% 0x00007fb133c61c4a
0 0.0% 100.0% 135210 0.0% 0x00007fb133c94425
0 0.0% 100.0% 3064228 0.4% 0x00007fb133d7c611
0 0.0% 100.0% 131080 0.0% 0x00007fb133dfc067
0 0.0% 100.0% 270421 0.0% 0x00007fb133dfc9f3
0 0.0% 100.0% 136258 0.0% 0x00007fb1340590c9
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0 0.0% 100.0% 676053 0.1% 0x00007fb13447aba7
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0 0.0% 100.0% 431231 0.1% 0x00007fb134c861a7
0 0.0% 100.0% 136258 0.0% 0x00007fb135122400
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0 0.0% 100.0% 136258 0.0% 0x00007fb135807ed1
0 0.0% 100.0% 136258 0.0% 0x00007fb135822eaf
0 0.0% 100.0% 297823 0.0% 0x00007fb135f85154
0 0.0% 100.0% 136258 0.0% 0x00007fb1368a7c42
0 0.0% 100.0% 1313955 0.2% 0x00007fb136e464e5
0 0.0% 100.0% 922058 0.1% 0x00007fb137245e69
0 0.0% 100.0% 408775 0.1% 0x00007fb13734a4aa
0 0.0% 100.0% 1226327 0.2% 0x00007fb13734a4d3
0 0.0% 100.0% 272517 0.0% 0x00007fb137e0760f
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0 0.0% 100.0% 136258 0.0% 0x00007fb137ea8aa4
0 0.0% 100.0% 136258 0.0% 0x00007fb13876c9e9
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0 0.0% 100.0% 136258 0.0% 0x00007fb139ee2f9c
0 0.0% 100.0% 408775 0.1% 0x00007fb13a03f0be
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0 0.0% 100.0% 272517 0.0% 0x00007fb13a04e64e
0 0.0% 100.0% 136258 0.0% 0x00007fb13a920fca
0 0.0% 100.0% 136258 0.0% 0x00007fb13a92130b
0 0.0% 100.0% 136258 0.0% 0x00007fb13af0b151
0 0.0% 100.0% 136258 0.0% 0x00007fb13b7609a2
0 0.0% 100.0% 136258 0.0% 0x00007fb13b770cb0
0 0.0% 100.0% 408775 0.1% 0x00007fb13bd55409
0 0.0% 100.0% 136258 0.0% 0x00007fb13c062aea
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0 0.0% 100.0% 698085685 87.8% AsyncGetCallTrace
0 0.0% 100.0% 162799014 20.5% JNI_CreateJavaVM
0 0.0% 100.0% 35102689 4.4% JNI_GetCreatedJavaVMs
0 0.0% 100.0% 131296 0.0% JNU_NewObjectByName
0 0.0% 100.0% 4766447 0.6% JVM_DefineClass
0 0.0% 100.0% 29155153 3.7% JVM_DefineClassWithSource
0 0.0% 100.0% 1204712 0.2% JVM_DoPrivileged
0 0.0% 100.0% 444413 0.1% JVM_FillInStackTrace
0 0.0% 100.0% 266346 0.0% JVM_FindClassFromBootLoader
0 0.0% 100.0% 270421 0.0% JVM_FindClassFromCaller
0 0.0% 100.0% 279249 0.0% JVM_FindLoadedClass
0 0.0% 100.0% 131080 0.0% JVM_GetClassDeclaredConstructors
0 0.0% 100.0% 824436 0.1% JVM_GetClassDeclaredFields
0 0.0% 100.0% 942399 0.1% JVM_GetClassDeclaredMethods
0 0.0% 100.0% 135210 0.0% JVM_GetClassName
0 0.0% 100.0% 159413372 20.1% JVM_InternString
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0 0.0% 100.0% 431231 0.1% JVM_MonitorWait
0 0.0% 100.0% 409855 0.1% JVM_RawMonitorExit
0 0.0% 100.0% 1707451 0.2% JVM_StartThread
0 0.0% 100.0% 714622614 89.9% JVM_handle_linux_signal
0 0.0% 100.0% 253077 0.0% Java_java_lang_ClassLoader_00024NativeLibrary_load
0 0.0% 100.0% 29155153 3.7% Java_java_lang_ClassLoader_defineClass1
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0 0.0% 100.0% 270421 0.0% Java_java_lang_Class_forName0
0 0.0% 100.0% 444413 0.1% Java_java_lang_Throwable_fillInStackTrace
0 0.0% 100.0% 131136 0.0% Java_java_lang_reflect_Proxy_defineClass0
0 0.0% 100.0% 1036965 0.1% Java_java_util_zip_Inflater_inflateBytes
0 0.0% 100.0% 3064228 0.4% Java_java_util_zip_ZipFile_open
0 0.0% 100.0% 131296 0.0% Java_sun_management_Flag_getFlags
0 0.0% 100.0% 356982 0.0% ZIP_Open
0 0.0% 100.0% 3421211 0.4% ZIP_Unlock
0 0.0% 100.0% 569857981 71.7% __clone
0 0.0% 100.0% 253077 0.0% __dlopen_check
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0 0.0% 100.0% 253077 0.0% _dl_catch_error
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0 0.0% 100.0% 393920 0.0% fork1
0 0.0% 100.0% 1036965 0.1% inflate
0 0.0% 100.0% 569857981 71.7% start_thread
Как график:
Я также использовал инструмент отслеживания собственной памяти Java, чтобы точно определить утечкуhttps://docs.oracle.com/javase/8/docs/technotes/guides/vm/nmt-8.html NMT сообщил об утечке памяти в разделе «Внутренний». График вызовов показывает, что JVM_FindSignal вызывается в результате start_thread, однако инструмент NMT diff сообщил, что количество потоков приложений почти постоянное и остается на уровне ~ 300.
Варианты JVM:
-Xms24920m -Xmx24920m -XX:MaxMetaspaceSize=512m -XX:+AlwaysPreTouch
-XX:+UseG1GC -XX:G1HeapWastePercent=10
-XX:+UseTLAB
-XX:+ScavengeBeforeFullGC -verbose:gc
-XX:+PrintGCDetails
-XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution
-XX:+PrintGCApplicationConcurrentTime
-XX:+PrintGCApplicationStoppedTime
-Djava.rmi.server.hostname=XXXXX
-Dcom.sun.management.jmxremote.port=XXXXX
-Dcom.sun.management.jmxremote.ssl=false
Итак, JVM_FindSignal выделил и не выпустил 789 мегабайт собственной памяти, есть ли у кого-нибудь представление о том, что делает JVM_FindSignal и почему он будет постоянно выделять память?