What does free heap memory mean?

[meistermn]

The amount of free memory in the vmkernel for ESX Server SV010001 is running low. Only 8321,00 KB of free heap memory remains.

This rule checks for adequate Heap memory on ESX servers. Add more physical memory to the server or use VMotion to better balance utilization across servers in the cluster.

What does free heap memory mean? And why do I get this message although on new esx servers without any workload.

[ablej]

If you haven't already I would run a memtest on the memory. I have seen somthing to this degree and it was caused by bad memory

http://www.memtest86.com/

David Strebel

www.holy-vm.com

[RParker]

What does free heap memory mean?

According to VM Ware, there is a patch for this. What build/version of ESX are you running?

http://kb.vmware.com/selfservice/search.do?cmd=displayKC&docType=kc&externalId=1004424&sliceId=1&doc...

Heap Memory

Heap is the memory allocated in runtime during program

execution. When memory is allocated using malloc() or calloc() for any

pointer in a program, the size of the memory is allocated from the heap

memory area and is assigned to the pointer. Until the pointer is freed

using free() the heap memory is used by the pointer variable.

[meistermn]

esx 3.5 update 1 and 2

[TomHowarth]

|The amount of free memory in the vmkernel for ESX Server SV010001 is running low. Only 8321,00 KB of free heap memory remains.|

|This rule checks for adequate Heap memory on ESX servers. Add more physical memory to the server or use VMotion to better balance utilization across servers in the cluster.|

What does free heap memory mean? And why do I get this message although on new esx servers without any workload.

Heap memory is an internal memory pool created at the startup of a process that tasks use to dynamically allocate memory as needed. it is a programming thing.

Tom Howarth

VMware Communities User Moderator

[JDLangdon]

I knew it! Blame the programmers. :smileyangry:

________________________________

Jason D. Langdon

This space is for rent.

[doubleH]

are you using vFoglight?

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[JDLangdon]

Hey DoubleH,

I'm still running a demo version of vFoglight and I've got 10 ESX servers with this heap memory error.

________________________________

Jason D. Langdon

This space is for rent.

[doubleH]

yes i have this to. i created a case back in october with vmware. they have an internal kb that i'll share.....

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The user reports an error such as

The amount of free memory in the vmkernel for ESX Server ykesx02.yk.udlp.com is running low. Only 8045.00 KB of free heap memory remains.

This rule checks for adequate Heap memory on ESX servers. Add more physical memory to the server or use VMotion to better balance utilization across servers in the cluster.

Resolution

This is not an ESX error but caused by a 3rd party utiliity called vfoglight.

The proc node that this utility is reading is /proc/vmware/mem for System heap free

However 8 mb is well within acceptable range which means the 3rd party utuily default threashold are too high.

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I think i then went to vizioncore and created a case. I'll see if I can dig that up.

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[JDLangdon]

Thanks H.

vFoglight is a great product but I don't like these false errors.

________________________________

Jason D. Langdon

This space is for rent.