I am getting OutOfMemoryExceptions. How can I troubleshoot this?

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

Pavel Biryukov — Sat, 29 Sep 2012 10:10:44 GMT

Thanks! Very useful post!

5 years have passed - but it's still actual for debugging in the production environment :)

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

Roahn Luo — Thu, 06 Aug 2009 11:54:28 GMT

Great post!! It's really good! I almost envy you, Johan!!

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

JohanSt — Wed, 02 Jan 2008 12:45:32 GMT

Please check your version of sos. Try loading it using ".loadby sos mscorwks"

/ Johan

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

HS — Fri, 28 Dec 2007 23:24:25 GMT

Also I was wondering why does the "!dumpheap -stat" doesn't show me the type of objects and their individual sizes when I use this command on the dump that I collected whereas in your case it shows each type and its associated size.

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

Jaszeer — Fri, 21 Dec 2007 16:49:40 GMT

Johan,

Excellent Article! I was looking for this information for almost four years

can you help me in building strategy for toubleshooting OOM in web applications with 10-15 pages

it would be great help

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

orangy — Tue, 19 Jun 2007 12:56:36 GMT

Johan,

Thanks for your answer! Actually, it is .NET 2.0. Is it normal for this version too?

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

JohanSt — Mon, 18 Jun 2007 13:39:46 GMT

Hi Ilya,

This is very common for Framework 1.1.

You'll normally see these small free segments after static arrays. So pay no further attention to them.

/ Johan

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

Ilya Ryzhenkov — Sat, 16 Jun 2007 21:21:05 GMT

Hello, thanks for the article. I'm trying to pinpoint OOM problem and looking at LOH dump I can't understand small objects in the LOH:

0:028> !EEHeap -gc

...

Large object heap starts at 0x04f21000

segment begin allocated size

04f20000 04f21000 05ee4238 0x00fc3238(16527928)

31d60000 31d61000 32489e00 0x00728e00(7507456)

Total Size 0x9aec2a0(162448032)

...

0:028> !dumpheap 04f21000 05ee4238

Address MT Size

04f21000 03d25350 16 Free

04f21010 79124228 4096

04f22010 03d25350 16 Free

04f22020 79124228 4096

04f23020 03d25350 16 Free

04f23030 79124228 528

04f23240 03d25350 16 Free

04f23250 79124228 4096

04f24250 03d25350 16 Free

04f24260 79124228 6952

04f25d88 03d25350 16 Free

04f25d98 79124228 4096

04f26d98 03d25350 16 Free

04f26da8 79124228 4096

04f27da8 79124228 4096

04f28da8 03d25350 16 Free

04f28db8 79124228 4096

04f29db8 79124228 528

04f29fc8 03d25350 16 Free

04f29fd8 79124228 528

04f2a1e8 03d25350 16 Free

...

:028> !do 04f29fd8

Name: System.Object[]

...

Size: 528(0x210) bytes

Array: Rank 1, Number of elements 128, Type CLASS

Element Type: System.Object

Those objects of 528 bytes are object[128] filled with strings (those are stored in Gen2 heap). I have no idea, what are those 16 Free bytes in the LOH between arrays.

Could you please shed some light on this dumps? Or may be I'm doing something wrong?

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

vikram — Tue, 23 Jan 2007 14:15:00 GMT

you are GOD..... got just want i wanted.....

re: I am getting OutOfMemoryExceptions. How can I troubleshoot this?

JohanSt — Tue, 16 Jan 2007 12:10:56 GMT

Hi Heather,

Well if you're not done with the images, then I can only assume there's something else on the heap that needs to be dealt with.

I'd get a hangdump right before loading the images and analyze what's on the heap at that time. Do you have any data connections, streams, etc. that need to be closed?

/ Johan