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My application seems to hang. What do I do? – Part 1

September 28, 2006 Sep 28, 2006 09/28/06
maoni
Defining “hang” is a good place to start.   When people say “hang” they could mean all sorts of things. When I say “hang” I mean the process is not making progress – the threads in the process are either blocked (eg. deadlocked, or not scheduled because of threads from other processes) or executing code (madly) but not doing...

Understand the problem before you try to find a solution

September 1, 2006 Sep 1, 2006 09/1/06
maoni
So far I’ve never written a blog entry that gives out philosophical advices on doing performance work. But lately I thought perhaps it’s time to write such an entry because I’ve seen enough people who looked really hard at some performance counters (often not correct ones) or some other data and asked tons of questions such as “is this...

I Am a Happy Janitor – Part 1: Finding garbage

August 18, 2006 Aug 18, 2006 08/18/06
maoni
Indeed what I do is very much like the job of the janitors – like the ones who clean your building, or janitors you see at a food court, or yourself when you are taking care of garbage at your house. Doubtful you say? Let me prove it to you. Finding garbage What do you do when you are having lunch with your friends at a food court and ...

Suspending and resuming threads for GC

June 7, 2006 Jun 7, 2006 06/7/06
maoni
First of all, suspension and resumption of threads is not really part of the GC. GC calls functions to do the suspension and the resumption as a service provided in the CLR. Other components in the CLR also use this service such as the debugger implementation. But it’s true that suspending and resuming because of the GC is the most ...

When memory is running low…

June 6, 2006 Jun 6, 2006 06/6/06
maoni
When I say memory I mean physical memory. Let’s assume that you have enough virtual memory space. When the physical memory gets low you may start getting OOMs or start paging. You can experiment and see how you can avoid getting into the low memory situation but sometimes it’s hard to predict and hard to test all scenarios your app can get...

Large Object Heap

April 19, 2006 Apr 19, 2006 04/19/06
maoni
LOH (Large Object Heap) contains objects that are 85,000 bytes or bigger (there’s also some objects that are less than 85,000 bytes that are allocated on the LOH by the runtime itself but usually they are very small and we’ll ignore them for this discussion).   The way LOH is implemented changed dramatically from 1.0 to 1.1. In 1.0 ...

Workstation GC for server applications?

March 1, 2006 Mar 1, 2006 03/1/06
maoni
In Using GC Efficiently – Part 2 I talked about different flavors of GC that exist in the CLR and how you choose which flavor is good for your applications, and I said that the Server GC flavor is designed for server applications. As with any performance tuning there are always exceptions – there’s no one-rule-fits-all. Recently I worked...

What do you want to know?

January 9, 2006 Jan 9, 2006 01/9/06
maoni
In my previous Using GC Efficiently entries I've basically covered all the big areas of GC in the CLR. There are of course a lot of things to write about GC but I want to keep GC users as my target audience, not GC designers/implementors. So I would really like to hear from you - our customers of the .NET Framework - if you have ...

So, what’s new in the CLR 2.0 GC?

October 4, 2005 Oct 4, 2005 10/4/05
maoni
Certainly that’s one of the most frequently asked questions I get (at the PDC too!). So since PDC already happened I can tell the rest of you about the new stuff happened in GC in CLR 2.0. The slides can be downloaded here. And I will be referring to some of the slides. I must apologize for your having to click on the link to see the slide ...