Re: maximum .net process can use
- From: "Zen" <zen@xxxxxxxxxxxxxx>
- Date: Wed, 18 Jan 2006 08:16:48 -0800
I used taskmanager that came with window to look at the memory usage info.
Would it help if I add another G or 2 to the server? Apparently each process
can use only up to 2G max of memory, but other items including the OS itself
would occupy a big junk of total memory leaving less memory for the asp.net.
I don't know the answer the question to that because the following 2 items
contradicting to each other:
1) With virtual memory system and enough harddisk space, the asp.net process
is already virtually working with 2G of memory, so adding physical memory
would only speed up (less swapping with page faults) but woudn't help
reducing OOM exception likelihood. My max page file size on harddisk is
1.5G.
2) However, when I moved from 1G to 2G physical memory, the system no longer
ran into OOM as often as before. With 1G, it could never load all my data
into memory for processing without seeing OOMs. Apparently adding more
physical memory did help.
To rephrase my original question, if I can afford any memory size I want,
which amount would be the max I can benefit from? There must be a stopping
point somewhere. I thought it was 2G but I could be wrong and hoping that
I'm wrong because making my code to work with smaller memory amount would be
very costly.
thanks!
zeng
"Willy Denoyette [MVP]" <willy.denoyette@xxxxxxxxxx> wrote in message
news:eWT1WfCHGHA.3752@xxxxxxxxxxxxxxxxxxxxxxx
>
> "Zen" <zen@xxxxxxxxxxxxxx> wrote in message
> news:%23IbVdJ9GGHA.2036@xxxxxxxxxxxxxxxxxxxxxxx
> | Hi,
> |
> | My production machine has 2G of memory, when aspnet_wp.exe goes up to
> about
> | ~1.2G of memory usage, I start get out-of-memory exception. Other
> processes
> | don't use as much memory and I added all the peak memory usage of all
> the
> | processes (including aspnet_wp.exe), it goes up to no more than 1.5.
> |
> | How is that possible? Would anyone know please help? thanks!
> |
> |
>
> The amount of RAM is one thing, but the most important is the amount of
> Virtual memory your process has allocated.
> Each windows process (32 bit not /4GT enabled) has a maximum of 2GB
> Virtual
> Address Space (VAS). This space is used to map the code of the ASP.NET
> worker the CLR the C runtime and a couple of other DLL's plus your
> application code (the IL and JIT'd code) the native process heaps and the
> GC
> heaps.
> So when you say that aspnet_wp.exe goes up to ~1.2GB you have to know
> exactly what you are looking at and what tool you are using for this.
> Anyway, you should never assume you have 2GB available, you should profile
> your application and have a close look at your allocation patterns and the
> type of objects you are allocating, take care about large objects (>85kb)
> these tend to fragment the large object heap (especially in v1.x), and you
> should always be prepared to get OOM exceptions thrown on you especially
> in
> server applications.
>
> Willy.
>
>
.
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