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• Forensic Analysis of the OOM-Killer

  - by Oddthinking

  Ubuntu's Out-Of-Memory Killer wreaked havoc on my server, quietly assassinating my applications, sendmail, apache and others. I've managed to learn what the OOM Killer is, and about its "badness" rules. While my machine is small, my applications are even smaller, and typically only half of my physical memory is in use, let alone swap-space, so I…

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• OOM-Killer, jboss and kernel panic

  - by user32425

  Hi, We are running RedHat 3.4.6(x32) on VMWareEsx3.5(x64) with 6GB RAM. A few java processes(including jboss) are running in the background. The problem is that the java processes consume lots of memory, and sometimes they are killed by the OOM-killer. When OOM-killer is about to act, the free physical memory is very low 100MB-200MB, but the…

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• Virtual dedicated server repetitive draining RAM, OOM constantly

  - by Deerly

  My linux (fedora red hat 7) virtual dedicated server has been experiencing OOM multiple times a day for the past several days. I thought the issue was with spamd/spamassassin but after disabling this the errors remains. The highest usage displayed on ps faux --cumulative: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME…

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• Turn off the Linux OOM killer by default?

  - by Peter Eisentraut

  The OOM killer on Linux wreaks havoc with various applications every so often, and it appears that not much is really done on the kernel development side to improve this. Would it not be better, as a best practice when setting up a new server, to reverse the default on the memory overcommitting, that is, turn it off (vm.overcommit_memory=2)…

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• Weird console problem in linux, usually right before OOM

  - by Kevin Quinn

  So I've noticed this happen more than once. If I remember correctly, this usually happens right before OOM, and/or kernel panic that if you type into a tty and then try to backspace it, the same characters are printed back in reverse. This has been merely an interesting oddity to me in the past, but it happened again recently, and I've…

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• Virtual dedicated surver repetitive draining RAM, OOM constantly

  - by Deerly

  My linux (fedora red hat 7) virtual dedicated server has been experiencing OOM multiple times a day for the past several days. I thought the issue was with spamd/spamassassin but after disabling this the errors remains. The highest usage displayed on ps faux --cumulative: USER PID %CPU %MEM VSZ RSS TTY STAT START…

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• Virtual dedicated server repetitive draining RAM, OOM constantly

  - by Deerly

  My linux (fedora red hat 7) virtual dedicated server has been experiencing OOM multiple times a day for the past several days. I thought the issue was with spamd/spamassassin but after disabling this the errors remains. The highest usage displayed on ps faux --cumulative: USER PID %CPU %MEM VSZ RSS TTY STAT START…

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• Android - BitmapFactory.decodeByteArray - OutOfMemoryError (OOM)

  - by Bob Keathley

  I have read 100s of article about the OOM problem. Most are in regard to large bitmaps. I am doing a mapping application where we download 256x256 weather overlay tiles. Most are totally transparent and very small. I just got a crash on a bitmap stream that was 442 Bytes long while calling BitmapFactory.decodeByteArray(....). The…

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• OOM-Killer called every now and then..

  - by SpyrosP

  Hello there, i have a dedicated server where i've installed apache2, as well as Rails Passenger. Although i have 2GBs of RAM and most times about 1,5GB is free, there are some random times when i lose ssh and generic connectivity because oom-killer is killing processes. I suppose there is a memory leak but i cannot find out where…

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• How to read oom-killer syslog messages?

  - by Grant

  I have a Ubuntu 12.04 server which sometimes dies completely - no SSH, no ping, nothing until it is physically rebooted. After the reboot, I see in syslog that the oom-killer killed, well, pretty much everything. There's a lot of detailed memory usage information in them. How do I read these logs to see what caused the OOM…

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• How to diagnose causes of oom-killer killing processes

  - by dunxd

  I have a small virtual private server running CentOS and www/mail/db, which has recently had a couple of incidents where the web server and ssh became unresponsive. Looking at the logs, I saw that oom-killer had killed these processes, possibly due to running out of memory and swap. Can anyone give me some pointers at…

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• Staggering java linux process startup to prevent OOM

  - by ctennis

  I am running a number of java processes on a single Linux machine. From a memory and computing standpoint, everything is fine when things are static. However, periodically we use a configuration management package up upgrade the jar or war files, and restart the java process. The problem is, that is restarts them all…

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• how to make war file take up less memory

  - by Myy

  I need help on how to decrease the memory usage of my web app. so I can fit more into my webserver. so I'm building a java web app with JSF 2.0 developing in eclipse helios and running on an Apache tomcat Server. And I have a dedicated virtual server with a tomcat aswell where I deploy these war files. the webApp is about…

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• How to detect Out Of Memory condition?

  - by Jaromir Hamala

  I have an application running on Websphere Application Server 6.0 and it crashes nearly every day because of Out-Of-Memory. From verbose GC is certain there are the memory leaks(many of them) Unfortunately the application is provided by external vendor and getting things fixed is slow & painful process. As part of…

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• Sending big file by webservice and OOM exception

  - by phenevo

  Hi, I have webservice, with method: [WebMethod] public byte[] GetFile(string FName) { System.IO.FileStream fs1 = null; fs1 = System.IO.File.Open(FName, FileMode.Open, FileAccess.Read); byte[] b1 = new byte[fs1.Length]; fs1.Read(b1, 0, (int)fs1.Length); fs1.Close(); return b1; } …

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• Android, displaying a bitmap of arbitrary size without running out of memory.

  - by Robert Foss

  How do I display an image of arbitrary size without OOMing or downscaling the image. I dont want to downscale due to zooming and dragging of the picture? If it isnt possible to display an image of arbitrary size, how do I determine the maximum possible size of the image to display, without causing a OOM?

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• Displaying a bitmap of arbitrary size without running out of memory.

  - by Robert Foss

  How do I display an image of arbitrary size without OOMing or downscaling the image. I dont want to downscale due to zooming and dragging of the picture? If it isnt possible to display an image of arbitrary size, how do I determine the maximum possible size of the image to display, without causing a OOM?

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• swapping or trashing with vast amounts of unmapped pagecache

  - by Marco

  I'm using kubuntu jaunty (i386 32bit), kernel 2.6.28-13-generic. I've 4Gb of RAM, of which only 3317Mb are seen by the system (I guess because of the 32bit system). I'm seeing that the pagecache utilization is continually growing, up to the point that the system is unusable (after a few days). This happens also when I…

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• swapping or thrashing with vast amounts of unmapped pagecache

  - by Marco

  EDIT: I noticed that this is more appropriate for superuser.com, I apologize. I don't know how to delete this question. I'm using kubuntu jaunty (i386 32bit), kernel 2.6.28-13-generic. I've 4Gb of RAM, of which only 3317Mb are seen by the system (I guess because of the 32bit system). I'm seeing that the pagecache…

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• How to reliably take Java Heap Dumps?

  - by karlcyr

  My team is running into difficulties when trying to take good heap dumps triggered by OutOfMemoryErrors. For specific reasons we are currently taking the dumps with jmap called from a bash script instead of using the HeapDumpOnOutOfMemoryError flag. We're using a 64-bit 1.6 JVM with a heap size around 3 GB. Our…

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• can a OOM be caused by not finding enough contiguous memory?

  - by raticulin

  I start some java code with -Xmx1024m, and at some point I get an hprof due to OOM. The hprof shows just 320mb, and give me a stack trace: at java.util.Arrays.copyOfRange([CII)[C (Arrays.java:3209) at java.lang.String.<init>([CII)V (String.java:215) at…

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• weblogic 9 - best way of manually forcing a heap dump - not at OOM.

  - by monojohnny

  Is there a simple commandline that can be issued to weblogic 9.2 to force the JVM to produce a heap dump ? Thanks,

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• Memory Leak Looping cfmodule inside cffunction

  - by orangepips

  Hoping someone else can confirm or tell me what I'm doing wrong. I am able to consistently reproduce an OOM running by calling the file oom.cfm (shown below). Using jconsole I am able to see the request consumes memory and never releases it until complete. The…

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• Auto restart server if virtual memory is too low

  - by Sukhjinder Singh

  There are quite number of software running on my server: httpd, varnish, mysql, memcache, java.. Each of them is using a part of the virtual memory and varnish was configured to be allocated 3GB of memory to run. Due to high traffic load which is 100K, our…

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• Large memory chunk not garbage collected

  - by Niels

  In a hunt for a memory-leak in my app I chased down a behaviour I can't understand. I allocate a large memory block, but it doesn't get garbage-collected resulting in a OOM, unless I explicit null the reference in onDestroy. In this example I have two…

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