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Home » Archived » DSDP - Real-Time Software Components (RTSC) » Iterate over all heap instances?
Iterate over all heap instances? [message #537582] Thu, 03 June 2010 02:08 Go to next message
Chris Ring is currently offline Chris RingFriend
Messages: 16
Registered: July 2009
Location: Santa Barbara, CA
Junior Member
Is there a way to, at runtime, iterate over all heap instances?

My concrete use case is to periodically call Memory_getStats() on all heap instances to determine the memory usage in my app, as well as detect any memory leaks when it completes. The first arg to Memory_getStats() is a heap instance handle, so I'm looking to enumerate all the heap instance handles and call Memory_getStats() on each one.

Thanks.

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Re: Iterate over all heap instances? [message #537791 is a reply to message #537582] Thu, 03 June 2010 16:00 Go to previous messageGo to next message
Dave Russo is currently offline Dave RussoFriend
Messages: 172
Registered: July 2009
Senior Member
On 6/2/2010 7:08 PM, Chris Ring wrote:
> Is there a way to, at runtime, iterate over all heap instances?
>
Yes. You need to know the module to get the instances, however. Every
module that manages instances provides a function that allows one to
iterate over all dynamic (or static) instances.

See http://rtsc.eclipse.org/docs-tip/C_-_Object_first

> My concrete use case is to periodically call Memory_getStats() on all
> heap instances to determine the memory usage in my app, as well as
> detect any memory leaks when it completes. The first arg to
> Memory_getStats() is a heap instance handle, so I'm looking to enumerate
> all the heap instance handles and call Memory_getStats() on each one.
>
> Thanks.

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Re: Iterate over all heap instances? [message #537815 is a reply to message #537791] Thu, 03 June 2010 17:45 Go to previous messageGo to next message
Chris Ring is currently offline Chris RingFriend
Messages: 16
Registered: July 2009
Location: Santa Barbara, CA
Junior Member
Thanks. Doesn't quite meet my use case, though. By design(!) I have no idea what Modules will in my system when I compile my library.

Maybe I can, in my meta-only module's .xdt file, loop over all Modules in the system that inherit from IHeap and somehow generate a function that does what I need. (I can't find all Modules that inherit from IHeap at runtime, can I?)

Given all the <Mod>'s that inherit IHeap, I guess I can then use <Mod>_Object_first()/next() for any dynamic instances and <Mod>_Object_count()/get() for the static instances. Given all that, I could probably call this autogenerated fxn.

Any other suggestions? This isn't trivial to put together, and if there's an easier way, I'm looking for it. Rolling Eyes Thanks in advance.

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Re: Iterate over all heap instances? [message #537871 is a reply to message #537815] Fri, 04 June 2010 00:05 Go to previous messageGo to next message
Dave Russo is currently offline Dave RussoFriend
Messages: 172
Registered: July 2009
Senior Member
On 6/3/2010 10:45 AM, Chris Ring wrote:
> Thanks. Doesn't quite meet my use case, though. By design(!) I have no
> idea what Modules will in my system when I compile my library.
>
> Maybe I can, in my meta-only module's .xdt file, loop over all Modules
> in the system that inherit from IHeap and somehow generate a function
> that does what I need. (I can't find all Modules that inherit from IHeap
> at runtime, can I?)
Right (and Right)
>
> Given all the <Mod>'s that inherit IHeap, I guess I can then use
> <Mod>_Object_first()/next() for any dynamic instances and
> <Mod>_Object_count()/get() for the static instances. Given all that, I
> could probably call this autogenerated fxn.
Right.
>
> Any other suggestions? This isn't trivial to put together, and if
> there's an easier way, I'm looking for it. :roll: Thanks in advance.
Unfortunately, there is no better way today. Although it is possible to
create the data structures to scan all instances that are created by
modules that inherit a specific interface this would result in a fair
amount of data in systems that don't need (and can't afford) the overhead.

Obviously this can can a configurable option. Contributions are welcome.

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Re: Iterate over all heap instances? [message #538052 is a reply to message #537582] Fri, 04 June 2010 16:52 Go to previous message
Dave Russo is currently offline Dave RussoFriend
Messages: 172
Registered: July 2009
Senior Member
FWIW: The first heap example in the RTSC-pedia illustrates a technique
for monitoring memory and checking for memory leaks/overflow and uses
the Object_get() methods to loop over all instances of a heap module:
http://rtsc.eclipse.org/docs-tip/Extending_xdc.runtime_Memor y/Example_1


On 6/2/2010 7:08 PM, Chris Ring wrote:
> Is there a way to, at runtime, iterate over all heap instances?
>
> My concrete use case is to periodically call Memory_getStats() on all
> heap instances to determine the memory usage in my app, as well as
> detect any memory leaks when it completes. The first arg to
> Memory_getStats() is a heap instance handle, so I'm looking to enumerate
> all the heap instance handles and call Memory_getStats() on each one.
>
> Thanks.

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