Am 4. April 2020 14:53:17 MESZ schrieb calder <calder....@gmail.com>: >On Fri, Apr 3, 2020 at 8:48 PM Mark Boon <mb...@vmware.com.invalid> >wrote: >> >> For the past few months we’ve been trying to trace what looks like >gradual memory creep. After some long-running experiments it seems due >to memory leaking when >> jni_invoke_static(JNIEnv_*, JavaValue*, _jobject*, JNICallType, >_jmethodID*, JNI_ArgumentPusher*, Thread*) is invoked. Somewhere. >> >> My environment is Tomcat running a proxy webapp. It does TLS >termination, authentication and then forwards the call to local >services. It doesn’t do much else, it’s a relatively small application. >> >> Some (possibly relevant) versions and config parameters: >> Tomcat 8.5 >> Java 8u241 (Oracle) >> Heap size = 360Mb >> MAX_ALLOC_ARENA=2 >> MALLOC_TRIM_THRESHOLD_=250048 >> jdk.nio.maxCachedBufferSize=25600 >> >> We couldn’t find any proof of memory leaking on the Java side. >> When we turn on NativeMemoryTracking=detail and we take a snapshot >shortly after starting, we see (just one block shown): >> >> [0x000003530e462f9a] JNIHandleBlock::allocate_block(Thread*)+0xaa >> [0x000003530e3f759a] JavaCallWrapper::JavaCallWrapper(methodHandle, >Handle, JavaValue*, Thread*)+0x6a >> [0x000003530e3fa000] JavaCalls::call_helper(JavaValue*, >methodHandle*, JavaCallArguments*, Thread*)+0x8f0 >> [0x000003530e4454a1] jni_invoke_static(JNIEnv_*, JavaValue*, >_jobject*, JNICallType, _jmethodID*, JNI_ArgumentPusher*, Thread*) >[clone .isra.96] [clone .constprop.117]+0x1e1 >> (malloc=33783KB type=Internal #110876) >> >> Then we run it under heavy load for a few weeks and take another >snapshot: >> >> [0x000003530e462f9a] JNIHandleBlock::allocate_block(Thread*)+0xaa >> [0x000003530e3f759a] JavaCallWrapper::JavaCallWrapper(methodHandle, >Handle, JavaValue*, Thread*)+0x6a >> [0x000003530e3fa000] JavaCalls::call_helper(JavaValue*, >methodHandle*, JavaCallArguments*, Thread*)+0x8f0 >> [0x000003530e4454a1] jni_invoke_static(JNIEnv_*, JavaValue*, >_jobject*, JNICallType, _jmethodID*, JNI_ArgumentPusher*, Thread*) >[clone .isra.96] [clone .constprop.117]+0x1e1 >> (malloc=726749KB type=Internal #2385226) >> >> While other blocks also show some variation, none show growth like >this one. When I do some math on the number (726749KB - 33783KB) / >(2385226 – 110876) it comes down to a pretty even 312 bytes per >allocation. >> And we leaked just under 700Mb. While not immediately problematic, >this does not bode well for our customers who run this service for >months. >> >> I’d like to avoid telling them they need to restart this service >every two weeks to reclaim memory. Has anyone seen something like this? >Any way it could be avoided? > >I'm a bit confused. Your stated title is "JNI Memory Leak?" >Tomcat, to my intimate knowledge, does not use JNI (correct me if I'm >rwong) >( quick check > user@stimpy:~/Desktop/tomcat-source/apache-tomcat-8.5.53-src> find . >-name *.c -ls > user@stimpy:~/Desktop/tomcat-source/apache-tomcat-8.5.53-src> find . >-name *.cpp -ls > user@stimpy:~/Desktop/tomcat-source/apache-tomcat-8.5.53-src> find . >-name *.asm -ls > user@stimpy:~/Desktop/tomcat-source/apache-tomcat-8.5.53-src> find . >-name *.pas -ls >} > >a) for the "snapshots" provided, there is NO reference to their >association, ie, "what" code are those related to? >b) could you run Mission Control or jvisualvm to locate a stack trace >for this? > >We have two apps that use JNI and run via Tomcat (and another app >server) - one is "so old" that it is limited to 32-bit ..... the one >memory leak we have encountered was related to the "native side" (for >us, the native-compiled Pascal side of things (we also use Assembly >code) via Java's JNI code). > >So, ultimately, I'm confused why we think Tomcat is "to blame" as >there is no evidence it uses JNI. >It's my experience JNI memory issues are related to the Java JNI or >proprietary native code. > >--------------------------------------------------------------------- >To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >For additional commands, e-mail: users-h...@tomcat.apache.org
Hi, I think jni is used via apr in tomcat. Do you use apr http connector? -- Diese Nachricht wurde von meinem Android-Gerät mit K-9 Mail gesendet. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
