Hello Chuck, On Fri, Dec 29, 2023 at 11:00 PM Chuck Caldarale <n82...@gmail.com> wrote:
> > > On Dec 29, 2023, at 19:48, Brian Braun <java08275...@gmail.com> wrote: > > > > First of all: > > Christopher Schultz: You answered an email from me 6 weeks ago. You > helped > > me a lot with your suggestions. I have done a lot of research and have > > learnt a lot since then, so I have been able to rule out a lot of > potential > > roots for my issue. Because of that I am able to post a new more specific > > email. Thanks a lot!!! > > > > Now, this is my stack: > > > > - Ubuntu 22.04.3 on x86/64 with 2GM of physical RAM that has been enough > > for years. > > > I presume the “2GM” above should be “2GB”. > Yes, sorry, I mean to write "2GB". > > > - Java 11.0.20.1+1-post-Ubuntu-0ubuntu122.04 / openjdk 11.0.20.1 > 2023-08-24 > > - Tomcat 9.0.58 (JAVA_OPTS="-Djava.awt.headless=true -Xmx1000m -Xms1000m > > ......") > > - My app, which I developed myself, and has been running without any > > problems for years > > > > Well, a couple of months ago my website/Tomcat/Java started eating more > and > > more memory about after about 4-7 days. The previous days it uses just a > > few hundred MB and is very steady, but then after a few days the memory > > usage suddenly grows up to 1.5GB (and then stops growing at that point, > > which is interesting). Between these anomalies the RAM usage is fine and > > very steady (as it has been for years) and it uses just about 40-50% of > the > > "Max memory" (according to what the Tomcat Manager server status shows). > > The 3 components of G1GC heap memory are steady and low, before and after > > the usage grows to 1.5GB, so it is definitely not that the heap starts > > requiring more and more memory. I have been using several tools to > monitor > > that (New Relic, VisualVM and JDK Mission Control) so I'm sure that the > > memory usage by the heap is not the problem. > > The Non-heaps memory usage is not the problem either. Everything there is > > normal, the usage is humble and even more steady. > > > What does the /proc/<tomcat_pid>/maps file show, both before and after the > problem occurs? This should give you some idea of what .so library is > grabbing the extra memory. (I only have Tomcat installed on macOS at the > moment, so I can’t show you an example; I should be able to bring up Tomcat > on a Linux box tomorrow.) The output may be long, depending on how > fragmented the virtual memory allocations are. > > This is the first time I hear about the "/proc/id/maps" file and how to see the content with "cat". The content is very long and now I suspect that all those strange lines that don't seem to be files are the source of my problem. Are those Linux threads or something like that? At least from the point of view of the JVM there are just 67 threads which I think is normal considering that I am running "New Relic" and also JMX (and the peak was 72 threads). I have reviewed all those java threads and all of them look normal and necessary. I will paste the content at the end of this email. > > And there are no leaks, I'm sure of that. I have inspected the JVM using > > several tools. > > > > There are no peaks in the number of threads either. The peak is the same > > when the memory usage is low and when it requires 1.5GB. It stays the > same > > all the time. > > > > I have also reviewed all the scheduled tasks in my app and lowered the > > amount of objects they create, which was nice and entertaining. But that > is > > not the problem, I have analyzed the object creation by all the threads > > (and there are many) and the threads created by my scheduled tasks are > very > > humble in their memory usage, compared to many other threads. > > > > And I haven't made any relevant changes to my app in the 6-12 months > before > > this problem started occurring. It is weird that I started having this > > problem. Could it be that I received an update in the java version or the > > Tomcat version that is causing this problem? > > > > If neither the heap memory or the Non-heaps memory is the source of the > > growth of the memory usage, what could it be? Clearly something is > > happening inside the JVM that raises the memory usage. And everytime it > > grows, it doesn't decrease. It is like if something suddenly starts > > "pushing" the memory usage more and more, until it stops at 1.5GB. > > > > I think that maybe the source of the problem is the garbage collector. I > > haven't used any of the switches that we can use to optimize that, > > basically because I don't know what I should do there (if I should at > all). > > I have also activated the GC log, but I don't know how to analyze it. > > > I doubt that GC is the problem; if it were, it should show up in the GC > data, which you say is essentially the same before and after the problem > manifests itself.. > > > > I have also increased and decreased the value of "-Xms" parameter and it > is > > useless. > > > Unrelated to your problem, but for server processes, -Xms should be set to > the same value as -Xmx; no sense in thrashing between the two. > > I meant to write "-Xmx", sorry! I have increased and decreased the value of -Xmx but it doesn't seem to be relevant, since the consumption of the heap is humble anyway, so I think that a low value for -Xmx is enough and 1GB is way more than enough. In any case, I have set the value for -Xms with a very small value and also with the same value of -Xmx and I still have the same problem. At the end of the day, I understand that I should give the same value for both parameters. > > > Finally, maybe I should add that I activated 4GB of SWAP memory in my > > Ubuntu instance so at least my JVM would not be killed my the OS anymore > > (since the real memory is just 1.8GB). That worked and now the memory > usage > > can grow up to 1.5GB without crashing, by using the much slower SWAP > > memory, but I still think that this is an abnormal situation. > > > At least you have a workaround, as undesirable as it may be. > > Yes, indeed. Activating the SWAP file has been useful since now the OOM killer is not killing the Tomcat process so I don't need to wake up in the middle of the night to restart the whole Linux. But that is just a palliative so I don't feel proud of just doing that instead of finding the root of the problem and solving it. That is why I really want to understand what is going on. > - Chuck > > root@ip-172-31-72-117:~# cat /proc/458/maps c1800000-dda00000 rw-p 00000000 00:00 0 dda00000-ffe00000 ---p 00000000 00:00 0 ffe00000-ffe48000 rw-p 00b13000 103:01 516126 /usr/lib/jvm/java-11-openjdk-amd64/lib/server/classes.jsa ffe48000-fff00000 rw-p 00000000 00:00 0 fff00000-fff6c000 rw-p 00aa7000 103:01 516126 /usr/lib/jvm/java-11-openjdk-amd64/lib/server/classes.jsa fff6c000-100000000 rw-p 00000000 00:00 0 800000000-800002000 rwxp 00001000 103:01 516126 /usr/lib/jvm/java-11-openjdk-amd64/lib/server/classes.jsa 800002000-800aa6000 rw-p 00003000 103:01 516126 /usr/lib/jvm/java-11-openjdk-amd64/lib/server/classes.jsa 840000000-8409d3000 rw-p 00000000 00:00 0 8409d3000-880000000 ---p 00000000 00:00 0 562587ef1000-562587ef2000 r--p 00000000 103:01 516673 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 562587ef2000-562587ef3000 r-xp 00001000 103:01 516673 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 562587ef3000-562587ef4000 r--p 00002000 103:01 516673 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 562587ef4000-562587ef5000 r--p 00002000 103:01 516673 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 562587ef5000-562587ef6000 rw-p 00003000 103:01 516673 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 562587fa2000-56258af0f000 rw-p 00000000 00:00 0 [heap] 7f54c8000000-7f54c9a1b000 rw-p 00000000 00:00 0 7f54c9a1b000-7f54cc000000 ---p 00000000 00:00 0 7f54d0000000-7f54d3ff5000 rw-p 00000000 00:00 0 7f54d3ff5000-7f54d4000000 ---p 00000000 00:00 0 7f54d4000000-7f54d8000000 rw-p 00000000 00:00 0 7f54d8000000-7f54dbffd000 rw-p 00000000 00:00 0 7f54dbffd000-7f54dc000000 ---p 00000000 00:00 0 7f54dc000000-7f54dfffd000 rw-p 00000000 00:00 0 7f54dfffd000-7f54e0000000 ---p 00000000 00:00 0 7f54e0000000-7f54e3ffd000 rw-p 00000000 00:00 0 7f54e3ffd000-7f54e4000000 ---p 00000000 00:00 0 7f54e4000000-7f54e7ffd000 rw-p 00000000 00:00 0 7f54e7ffd000-7f54e8000000 ---p 00000000 00:00 0 7f54e8000000-7f54ebffa000 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/usr/lib/locale/C.utf8/LC_TELEPHONE 7f55ad4a3000-7f55ad4a4000 r--p 00000000 103:01 7213 /usr/lib/locale/C.utf8/LC_MEASUREMENT 7f55ad4a4000-7f55ad4a5000 ---p 00000000 00:00 0 7f55ad4a5000-7f55ad4a6000 r--p 00000000 00:00 0 7f55ad4a6000-7f55ad4a8000 rw-p 00000000 00:00 0 7f55ad4a8000-7f55ad4aa000 r--p 00000000 103:01 6271 /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 7f55ad4aa000-7f55ad4d4000 r-xp 00002000 103:01 6271 /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 7f55ad4d4000-7f55ad4df000 r--p 0002c000 103:01 6271 /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 7f55ad4df000-7f55ad4e0000 r--p 00000000 103:01 7212 /usr/lib/locale/C.utf8/LC_IDENTIFICATION 7f55ad4e0000-7f55ad4e2000 r--p 00037000 103:01 6271 /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 7f55ad4e2000-7f55ad4e4000 rw-p 00039000 103:01 6271 /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 7fffecd4f000-7fffecd70000 rw-p 00000000 00:00 0 [stack] 7fffecdd8000-7fffecddc000 r--p 00000000 00:00 0 [vvar] 7fffecddc000-7fffecdde000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0 [vsyscall] root@ip-172-31-72-117:~#
