4/19/2023 0 Comments Cudalaunch kernel out of memory![]() ![]() ![]() If you check /var/log/messages you can see that demo3.out invoked oom-killer and kernel killed java process Oct 17 22:54:52 kernel: demo3.out invoked oom-killer: gfp_mask=0x14280ca(GFP_HIGHUSER_MOVABLE|_GFP_ZERO), nodemask=0, order=0, oom_score_adj=0 Oct 17 22:54:52 kernel: demo3.out cpuset=/ mems_allowed=0 …. ➜ ~ + 19668 killed java -Xmx4g DemoLimit > /dev/null demo3.out > /dev/null & 19713Īfter some time oom killed 19668 pid of java. Now run the C program ➜ ~ gcc demo3.c -o demo3.out ➜ ~. Now if we look at the score of above process 19668 below are the oom scores ➜ ~ more /proc/19668/oom_adj 0 ➜ ~ more /proc/19668/oom_score_adj 0 ![]() When demo3 (with same oom score) process asked memory, oom killed java process ➜ ~ java -Xmx4g DemoLimit > /dev/null & 19668 I used below java program, which requests memory in a loop.īefore adjusting oom score for java process. One way to resolve this is by having low oom score for application process. Now the issue here is we will not be able to find any memory leaks happening at JVM level if it is killed by oom-killer. Note: If /bin/java is asking for more memory, and if no virtual memory is available then oom killer kills /bin/java process. STATUS | wrapper | 8 11:12:24 | Launching a JVM. ERROR | wrapper | 8 11:12:20 | JVM exited unexpectedly. STATUS | wrapper | 8 11:12:20 | JVM process is gone. Then you might see below logs in wrapper logs STATUS | wrapper | 8 11:12:20 | JVM received a signal SIGKILL (9). If you are using any java service wrapper like Whenever oom killer is invoked, you can check system logs at /var/log/messages, you will similar logs like below Oct 8 11:12:20 app-4427800876 kernel: splunkd invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0 … Oct 8 11:12:20 app-4427800876 kernel: Out of memory: Kill process 27364 (java) score 933 or sacrifice child Where to see if oom killer killed your process? Kernel invoking oom killer on a process with high oom score Here /bin/java is the main backend application and splunkd is the splunk forwarder to forward the logs of /bin/java process. If splunkd asked for more memory and if there is no enough virtual memory kernel invokes oom killer on any process which has high oom score in this case its /bin/java. bash-4.1$ ps -ef | grep /bin/java | grep -v grep | awk '/oom_score 0Īs you can see /bin/java process has 881 oom score where as splunkd and sshd has 0 oom score. In Linux based systems, every process has a oom score, you can find oom score for a process like below. The purpose of this article is to explain how a kernel can invoke (out-of-memory) oom killer to abruptly kill a process which might be a java or node process of your application and what steps we can take to resolve such type of issues. ![]()
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