Force garbage collection on a process

[Ganesh]

Is there a utility by microsoft (or anyone) to force garbage collection in a
process without have access to the process code.

regards
Ganesh

 

[John Spiegel]

Hey Ganesh,

The Sysem namespace has a GC class, which has a collect method...

GC.Collect()

Check the help under Garbage Collection, subtopic: Forcing Garbage
Collection.

HTH,

John

 

[Chris Lyon [MSFT]]

Hi Ganesh

There is no Microsoft tool (and I doubt any 3rd party tool exists). Each process gets its own GC Heap(s), and therefore its own GC Thread(s), so forcing a GC Collection on another
process, as far as I know, is impossible. It's probably not really desirable, since the GC is self-tuning and can decide when to collect based on memory pressure and allocation
patterns (among other things).

-Chris

--------------------

From: "Ganesh" <[email protected]>
Subject: Force garbage collection on a process
Date: Tue, 27 Jul 2004 11:44:18 -0700
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Is there a utility by microsoft (or anyone) to force garbage collection in a
process without have access to the process code.

regards
Ganesh

--

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[Erik Tamminga]

Hi Chris,

I've got another questing about the garbage collector.
The application (a windows service app) I created runs fine on my
development system (Xp), consumes ~50Mb ram and seems to collect garbage
just fine. Running the same app on a production server (W2000 Server) the
process keeps consuming more and more memory. I made sure there is no memory
leak in the application. After running a memory profiler I found out gen2
garbage collection is not happening (enough). The application continues to
consume memory until system resources are empty and the server slows down
tremendously.
The app in question is an network management application and is searching
the network for devices/components. The development system uses the same
network for testing (=same environment).
Both systems have the same amount of physical memory. Development server
shows ~50mb memory and 50Mb virtual memory usage. Production server ~800Mb
memory, 500-1000Mb virtual.

Any tips/hints on how to solve this issue?

Erik Tamminga
MCSD

Hi Ganesh

There is no Microsoft tool (and I doubt any 3rd party tool exists). Each

process gets its own GC Heap(s), and therefore its own GC Thread(s), so
forcing a GC Collection on another

process, as far as I know, is impossible. It's probably not really

desirable, since the GC is self-tuning and can decide when to collect based
on memory pressure and allocation

patterns (among other things).

-Chris

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[Chris Lyon [MSFT]]

Hi Erik

A couple of things you might want to try:
-What version of the runtime are you using? v1.1 has better large memory management than v1.0.
-Is your service running with Workstation or Server GC? You'll get better throughput with Server GC (you can specify this by hosting the runtime. See
http://msdn.microsoft.com/msdnmag/issues/01/03/clr/default.aspx)
-If possible, wait for the latest service packs due this summer (v1.0 SP3, v1.1 SP1)
-Take a look at Rico Mariani's blog (http://weblogs.asp.net/ricom/), in particular posts about recycling objects (http://weblogs.asp.net/ricom/archive/2004/02/11/71143.aspx)
and midlife crisis (http://weblogs.asp.net/ricom/archive/2003/12/04/41281.aspx)

Hope that helps!
-Chris


--------------------

From: "Erik Tamminga" <REVERSE_THIS_agnimmate@REVERSE_THIS_nerrats.ln>
References: <[email protected]> <4#[email protected]>
Subject: Re: Force garbage collection on a process
Date: Wed, 28 Jul 2004 13:04:10 +0200
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Hi Chris,

I've got another questing about the garbage collector.
The application (a windows service app) I created runs fine on my
development system (Xp), consumes ~50Mb ram and seems to collect garbage
just fine. Running the same app on a production server (W2000 Server) the
process keeps consuming more and more memory. I made sure there is no memory
leak in the application. After running a memory profiler I found out gen2
garbage collection is not happening (enough). The application continues to
consume memory until system resources are empty and the server slows down
tremendously.
The app in question is an network management application and is searching
the network for devices/components. The development system uses the same
network for testing (=same environment).
Both systems have the same amount of physical memory. Development server
shows ~50mb memory and 50Mb virtual memory usage. Production server ~800Mb
memory, 500-1000Mb virtual.

Any tips/hints on how to solve this issue?

Erik Tamminga
MCSD

Hi Ganesh

There is no Microsoft tool (and I doubt any 3rd party tool exists). Each

process gets its own GC Heap(s), and therefore its own GC Thread(s), so
forcing a GC Collection on another

process, as far as I know, is impossible. It's probably not really

desirable, since the GC is self-tuning and can decide when to collect based
on memory pressure and allocation

patterns (among other things).

-Chris

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[Chris Lyon [MSFT]]

Hi Shreeman

No, the GC doesn't only collect when the system is idle. If necessary, the GC will pause execution of the application to collect, depending on the GC mode used (on multiproc
machines, Concurrent GC does collections without pausing the application, making it ideal for interactive apps).

Also, collections don't only occur when the system is low on memory. Collections usually happen when an allocation into a particular generation fail. See
http://msdn.microsoft.com/msdnmag/issues/1100/gci/ for more info.

-Chris

--------------------

hi
Though i am not an expert i can share some of my exp on same.while searching the network using wmi and adsi i faced similar problem but my problem was not garbage

collection as i have written a certain service for that and i have disposed my individual instances myself.

so since the garbage collection works only when the system idle and low of memory so will it not be better to componentise ur apps and just the parts ince you are over with it.

may be i am wrong?If you ve solved or have any bettere idea .
mail to me.
i ll be more happy for any comments anfd suggestions.
bye
shreeman
(e-mail address removed)

Hi Chris,

I've got another questing about the garbage collector.
The application (a windows service app) I created runs fine on my
development system (Xp), consumes ~50Mb ram and seems to collect garbage
just fine. Running the same app on a production server (W2000 Server) the
process keeps consuming more and more memory. I made sure there is no memory
leak in the application. After running a memory profiler I found out gen2
garbage collection is not happening (enough). The application continues to
consume memory until system resources are empty and the server slows down
tremendously.
The app in question is an network management application and is searching
the network for devices/components. The development system uses the same
network for testing (=same environment).
Both systems have the same amount of physical memory. Development server
shows ~50mb memory and 50Mb virtual memory usage. Production server ~800Mb
memory, 500-1000Mb virtual.

Any tips/hints on how to solve this issue?

Erik Tamminga
MCSD

Hi Ganesh

There is no Microsoft tool (and I doubt any 3rd party tool exists). Each

process gets its own GC Heap(s), and therefore its own GC Thread(s), so
forcing a GC Collection on another

process, as far as I know, is impossible. It's probably not really

desirable, since the GC is self-tuning and can decide when to collect based
on memory pressure and allocation

patterns (among other things).

-Chris

--------------------
From: "Ganesh" <[email protected]>
Subject: Force garbage collection on a process
Date: Tue, 27 Jul 2004 11:44:18 -0700
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Is there a utility by microsoft (or anyone) to force garbage collection in a
process without have access to the process code.

regards
Ganesh

rights. Use of included script samples are subject to the terms specified at

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originated.

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[Ganesh]

Thanks Chris.
I was facing a similar problem that Erik was facing with the gen2 not being
cleaned up.

Will try out the workarounds given here

thanks
Ganesh

Hi Erik

A couple of things you might want to try:
-What version of the runtime are you using? v1.1 has better large memory management than v1.0.
-Is your service running with Workstation or Server GC? You'll get better

throughput with Server GC (you can specify this by hosting the runtime. See

http://msdn.microsoft.com/msdnmag/issues/01/03/clr/default.aspx)
-If possible, wait for the latest service packs due this summer (v1.0 SP3, v1.1 SP1)
-Take a look at Rico Mariani's blog (http://weblogs.asp.net/ricom/), in

particular posts about recycling objects
(http://weblogs.asp.net/ricom/archive/2004/02/11/71143.aspx)

and midlife crisis (http://weblogs.asp.net/ricom/archive/2003/12/04/41281.aspx)

Hope that helps!
-Chris


--------------------

From: "Erik Tamminga" <REVERSE_THIS_agnimmate@REVERSE_THIS_nerrats.ln>
References: <[email protected]>

Subject: Re: Force garbage collection on a process
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Hi Chris,

I've got another questing about the garbage collector.
The application (a windows service app) I created runs fine on my
development system (Xp), consumes ~50Mb ram and seems to collect garbage
just fine. Running the same app on a production server (W2000 Server) the
process keeps consuming more and more memory. I made sure there is no memory
leak in the application. After running a memory profiler I found out gen2
garbage collection is not happening (enough). The application continues to
consume memory until system resources are empty and the server slows down
tremendously.
The app in question is an network management application and is searching
the network for devices/components. The development system uses the same
network for testing (=same environment).
Both systems have the same amount of physical memory. Development server
shows ~50mb memory and 50Mb virtual memory usage. Production server ~800Mb
memory, 500-1000Mb virtual.

Any tips/hints on how to solve this issue?

Erik Tamminga
MCSD

Hi Ganesh

There is no Microsoft tool (and I doubt any 3rd party tool exists).

Each
process gets its own GC Heap(s), and therefore its own GC Thread(s), so
forcing a GC Collection on another

process, as far as I know, is impossible. It's probably not really

desirable, since the GC is self-tuning and can decide when to collect based
on memory pressure and allocation

patterns (among other things).

-Chris

--------------------
From: "Ganesh" <[email protected]>
Subject: Force garbage collection on a process
Date: Tue, 27 Jul 2004 11:44:18 -0700
Lines: 7
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2800.1437
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Is there a utility by microsoft (or anyone) to force garbage

collection
in a

process without have access to the process code.

regards
Ganesh

rights. Use of included script samples are subject to the terms specified at

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