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Hi, folks. And thank you for reporting issues with WpfPerf Performance Profiling tool. Now it was fixed, so, download and use new and fixed version.
Keep reporting, as you can see, you have the power to change!
Imaginary by Malcolm Dare
October 10th, 2008 · Comments (3)
Three days ago, I announced the new release of WPF Performance Profiling Tool. A couple hours after this was announced, I got a number of comments from you, readers. It was about issues with running this tool. I checked the issue and forwarded it to development team from Microsoft. The problem was in bad parsing of comma and point characters in this tool, when using it on non-US locale. Dev team took care about it and hopefully they will provide a fix soon.
Thank you for reading my blog, reporting and your awareness of such issues. This is very important to me and I’m really appreciate your efforts to help us to develop WPF community.
I’ll update you as soon as the patch will be available.
Thank you and Shana Tova!
September 28th, 2008 · Comments (3)
Finally, after a long time of silence, the new version of WPF Performance Profiling Tool is available for download for x32 and x64 OSs. So, what’s new there?
Ton of UI improvements for Visual Profiler
New search function to quick find elements in visual tree
Hot path (critical path) of CPU usage aside with CPU usage for single element
Configuration of tint for overlay windows
Live preview, ability to split columns, slider of graph duration, expanders to have cleaner screen and much much more
Perforator also got new UI and has history now.
There is new tool, named String allocation profiler
This tool is very useful for viewing and managing strings inside your application (another step toward normal localization support for WPF? Probably)
There are also some improvements in Event tracing tool. Select process for example
And much much more. Great thank to Josef and his team for this great work
September 25th, 2008 · Comments (10)
I tired to write about programming, code and similar nerd stuff. So today I’ll write about … batteries. How is it?
Today, batteries are in use all over our life. We have a battery in our mobile phone, computer, camera, mp3 player, even microwave, alarm and hand clock. So, the main problem with batteries, scientists all over the world work about is how to extend the working and life time. Let’s try to understand how to know whether the battery is good for us.
How to measure batteries
The number, can tell us whether the battery will work longer for us is charge (or actual). We measure charge in Ampere/hours (Ah). One ampere-hour is equals to 3600 coulombs (ampere-seconds) and represents an amount of charge, transferred by a steady current of one ampere for one hour. As higher this number is, your battery will work longer for the same consumer.
What does “steady current” means?
Steady current is the power in watts, associated with an amount of electricity, named voltage (V). So, constant voltage, associated with one Ah produces the power of the battery in Watts per hour (Wh). So, why we cannot measure batteries in Wh? The problem is, that the power vary during charge and discharge process. So, the exact energy is the integral over time of the instantaneous voltage time and the current. Calculation of those three parameters is simple:
W = V * A
Today’s battery contains large number of elements (cells) with different fillings. As higher the number of elements, this your battery will work longer. Total work time may vary because of different parameters: charging methods, temperature, the way we’re charging it, number of charge-discharge cycles, etc.
Types of batteries
There are various batteries, however the most famous are following:
Li-ION (lithium-ion): Number of charge-discharge cycles is between 500 and 700. The number of it depends on the depth of discharge. As more the battery discharged, this less number of cycles the battery will provide. It necessary to make a number of cycles for 14-16 hours until the battery will provide its nominal capacity. Each cycle the battery’s current will be increased until the nominal.
Pros: Good energy to weight ration – the battery rather small in compare to the current because of their high energy density.
No memory effect (no loss of maximum energy capacity on repeatedly recharge after partial discharge)
Slow loss of charge when not in use
Cons: Those batteries might explode under certain conditions.
Energy loss starts directly after first charge, thus don’t buy this battery if you need spare battery and will not use it directly after purchase.
NiCd (Nickel-Cadmium): Number or charge-discharge cycles is between 1000-1500. This number might increase if you’re using the battery properly. However, you need to “train” this battery to assure maximum performance.
Pros: Tolerate to deep discharge for long period.
High energy density
Low self-discharge rate – about 20%/month
Cons: Cadmium is toxic material
Memory effect – wrong usage pattern may cause to “false bottom” effect. The battery will stop charging, before the total capacity gathered.
Negative temperature coefficient – As the cell temperature rose, the internal resistance fell.
NiMH (Nickel-metal hydride): Number of charge-discharge cycles is under 1000 and depends on depth of discharging. Those batteries are very similar to NiCd, however those batteries can have two or three times the capacity of an equivalent size NiCd, but discharge rate is also higher.
Pros: Less toxic, price effective and have higher capacity then NiCd
Cons: High self discharge rate
High application discharge rate
Voltage drop near as it nears full discharge
Li-Pol (Lithium-polymer): Number of charge-discharge cycles is very low 100-150 and depends on depth of discharging. Newer Li-Pol batteries has higher cycle durability, however they are still expensive. This is successor of Li-ION batteries.
Pros: Energy density is over 20% higher, then that of Li-ION.
High charge rate, about 1-3 minutes for cell
Greater life cycle degradation rate in comparison to Li-ION
Very efficient current per size ration
Cons: High cost
Low charge-discharge rate
Today, most of batteries are Li-ION, in spite of the fact, that it has high life cycle degradation rate. This is about two years by now for general user. Also, those batteries degrades, even when not in use inside devices. You cannot leave uncharged battery unattended, because of the fact, that recharge may become impossible if the current drops under certain level. Also, those batteries are sensitive to temperature changes. On very low or high temperature the current degrades.
Ni-Cad batteries provides the most optimal life cycle degradation rate, however it very sensitive to the way, you’re using it. The ideal pattern for such batteries is “full charge – full discharge – full charge”, else you’ll suffer from the “memory effect”, I spoke earlier.
As you already understand, there is a wide range of battery types, so chargers are also different for those types of batteries. So, how to know if the charger we have is good for me and what to choose.
The best charger for your battery is the one, you got with the device. It tuned for the battery you have. But can we use 3rd party chargers? The answer is: yes, we can, however it’s very important to understand, that if you have Li-ION battery and slow charger, you might be unable to charge it, even if you’ll put it in forever.
Slow chargers works with current equals to about 1/10 of nominal battery current, thus it will take about 10-12 hours to full recharge cycle. Quick chargers uses 1/2-1 of nominal battery current, so recharge cycle can take between 1 to 3 hours.
In both cases, do not leave NiCd and NiMH batteries in charger for a long time after the end of charging process. Even after the end of charge, those batteries keep charging, thus the quality will degrade. The story is different for Li-ION and Li-Pol batteries, those types of batteries are indifferent for overcharging. They usually have controllers to stop charging process after full recharge.
Car chargers are not very healthy devices to charge batteries. Each time you’re turn your car on, it initiate new charge cycle, thus the quality of battery will degrade.
How to prolong battery life time?
Let’s assume, that most of devices have Li-ION battery. Once, you got a new device do not start using it with minimal capacity, also do not want to full discharge. Recharge it number of times until the capacity will be equal to almost equal to the nominal power.
Also, switch your device to turn into idle mode after reasonable amount of time. It’s better, if it possible to switch or hibernate the device, rather then turn it into idle. Turn off all unused modules (such as GPS, Wi-Fi, Blootooth for mobile phones). Large number of concurrently running processes are also degrade the power quickly, so you can use Vista Battery Saver to decrease this number in Windows Vista. In PDAs, almost all plugins for battery level and processes performance measurement usually only use the battery, rather then provide usable information. If you can, turn GPRS in your mobile phones and use only GSM, this might save about 30% of energy without QoS degradation. Also, in places without coverage mobile phones increase the level of signal, so decrease the time, you can use the device.
If during the charging process, the temperature of battery exceeds 60C (140F), stop charging immediately and recycle the charger. If the battery become swollen, recycle the battery. If Ni-MH battery discharges very quick, it’s possible to restore it, however restore is impossible for Li-ION batteries. If you’re feeling, that the capacity of Ni-MH battery degrades, you can calibrate it. Never train Li-ION batteries, the quality will degrade.
Do not store your battery empty. Charge it unto 40%-50% of nominal capacity and store in 15C (60F) in fridge. Also it worth to recharge unused batteries once a half-year. However, the best you can do is to use battery. This what it designed for.
September 19th, 2008 · Comments (9)
If you’re “in” WPF and/or Silverlight development and want to learn more about high performance programming in WPF or your ability to develop once for WPF and Silverlight, you’re invited to vote for my session in Dev Academy 3 and attend it:
- High performance programming with WPF in .NET framework 3.5 SP1
.NET 3.5 SP1 (Arrowhead) brings you full power of WPF by taking into account huge performance enhancements for Line-Of-Business by using data virtualization and high graphical applications by access to DirectX surfaces. This session will round up all new features to Arrowhead
- Unified development experience with Windows Presentation Foundation and Silverlight 2.0
Two years ago, Microsoft introduced Windows Presentation Foundation (WPF) to provide a unified platform for Rich Windows Client Applications development. A year later Silverlight was introduced as similar platform for Rich Internet Applications. Is it possible to use XAML based approach to share and reuse code for both frameworks? In this session we will learn how to develop reusable code base for productive, usable and well branded Client and Internet applications to wider distribution, demanded today.
Also, you can advice another session, you might be interested in via comments in this post
Thank you and see you there…
September 8th, 2008 · Comments (2)
Huge amount of people asked me about DataGrid control in WPF. There are some 3rd parties providing this control for free and not, However, I always adviced them to wait until Microsoft will release it with (or after) Arrowhead. So here comes the King. Some boys and girls from MS WPF dev team have OS initiative and released WPF toolkit. It’s absolutely free and includes all sources. Also it renewed with WPF DataGrid CTP and other tasty Futures inside with full source aside.
August 11th, 2008 · Comments (4)
For all those who asked, .NET 3.5 SP1 is final and available for download. What’s inside?
- ASP.NET Dynamic data
- Core improvements for CLR
- A lot of performance improvements in WPF
- ClickOnce enhancements
- ADO.NET with Data Services and Entity Framework
- LINQ2SQL and Data Provider for SQL Server 2008, that was released last week
- WCF with easier DataContract serialization
August 10th, 2008 · Comments (3)
If you are “in” WPF imaging, you, definitely, should read this post of Dwayne Need (who is SDM of WPF in Microsoft) about customizing BitmapSource. A ton of information about how to make Bitmap Source for your needs, what WIC is and how to use it. Also he has a lot of samples in CodePlex. Great work, Dwayne.
June 21st, 2008 · Comments (4)
Recently, I already wrote about PixelShader effects, introduced in .NET framework 3.5 SP1 (WPF). However it looks like for most people this syntax is still hard to understand. Today we’ll try to lean it more. In order to do this, I wrote small program, that helps you to write and debug pixel shader effects quickly. This how it looks like
Hit Open to load image, Write your code and hit Execute to compile and apply bitmap dx effect to the image. Let’s start from very beginning. Effect, that does nothing:
sampler2D input : register(s0);
float4 main(float2 uv : TEXCOORD) : COLOR
Color = tex2D( input , uv.xy);
This is the results:
What was done? We got pixel. Read it color and return it as it to the shader. Let’s do something more interesting.
Actually we can get float2 as coordinate, this means, that it can be spitted to uv.x and uv.y. Also color is float4 (argb), thus we can change color. Let’s multiply color by 3
Color = tex2D( input , uv.xy)*3;
And the result is bright image
We also can make operations with variables.
Color = tex2D( input , uv.xy)*uv.x;
We not have to change whole color. We can also change only its part. Blue for example
Color = tex2D( input , uv.xy);
Color.b = Color.b*2;
Or execute math operations
Color = tex2D( input , uv.xy);
Color.r = Color.r*sin(uv.x*100)*2;
Color.g = Color.g*cos(uv.x*150)*2;
Color.b = Color.b*sin(uv.x*50)*2;
Color is not only thing we can operate. Actually we’re sampling coordinates, so operations done with coordinates should work. Let’s try to stretch image
uv.x = uv.x * 0.5;
Color = tex2D( input , uv.xy);
Why 0.5? Should not it make it smaller? Actually not, you’re multiplying coordinates, so to make the image smaller, you should divide
uv.x = uv.x / 0.5;
Color = tex2D( input , uv.xy);
Some math could be fun here also
uv.y = uv.y + (sin(uv.y*100)*0.03);
Color = tex2D( input , uv.xy);
There are a ton of interesting effects you can do by using pixel shaders. Here for example color shift
Color = tex2D( input , uv);
Color.r -= tex2D( input , uv +(somevar/100)).r;
Color.g += tex2D( input , uv+ (somevar/200)).g;
Color.b -= tex2D( input , uv+ (somevar/300)).b;
Or, even cooler efects
Color -= tex2D(input , uv.xy-0.003)*2.7f;
Color += tex2D( input , uv.xy+0.003)*2.7f;
Color.rgb = (Color.r+Color.g+Color.b)/3.0f;
You can also use cases and ifs for even cooler effects
Color.rgb = (Color.r+Color.g+Color.b)/3.0f;
if (Color.r<0.2 || Color.r>0.9) Color.r = 0; else Color.r = 1.0f;
if (Color.g<0.2 || Color.g>0.9) Color.g = 0; else Color.g = 1.0f;
if (Color.b<0.2 || Color.b>0.9) Color.b = 0; else Color.b = 1.0f;
Other words, the sky is the limit.
Please note, that Pixel Shaders done in GPU only, thus it is the most efficient method to manipulate your images. Actually, you can apply effect to any UIElement, thus the sky is really the limit.
Have a nice day and be good people. Download code for this article. Notice, that you’ll need DirectX SDK to compile pixel shader files and use this program
June 17th, 2008 · Comments (20)
This TechEd, there are four sessions assigned to me:
Creating Rich Applications with Windows Presentation Foundation (300)
Completely new session about how to enrich user experience, by decreasing development efforts with WPF. In order to do this, we’ll try to take some application and completely recreate it, by using XAML only without any single code line.
Target audience: Developers and decide makers, who what to understand what can be done with WPF and how easy you can do it.
Understanding Reflection (400)
This is also new session for lazy developers. It’s not only about what reflection is or what’s new about reflection in latest frameworks (including .NET 3.5 and Silverlight), but also how to use it to make developer’s life easier. We’ll enter a bit into IL to understand what’s going on under the hoods, but most of session is about appliance of this technology for everyday developers’ tasks and challenges.
Target audience: Developers, have an experience with .NET programming
WPF Performance (400)
Session very similar to one, I had in Dev Academy 2. However this time it will focus on performance enhancements in .NET framework 3.5 SP1. I’ll speak about virtualization, parallel processing, DX surface direct access and more…
Target audience: Developers, have an experience with WPF development.
Game Development Using Microsoft’s Latest Technologies (300)
Fun session, I had in TechEd Israel with very complicated setup. Here the sneak preview of how it looks like. It listed as a 300 level, because the fact, that except this session’s fun, you can learn a lot of new there.
Target audience: Everyone, who love technology and want to have fun hour in the morning before advanced sessions will begin.
If you’re reading my blog, and you’re going TechEd Africa. Come and say me hello, ‘cos it would be really nice to see the faces of the people I’m writing to in this blog
More information about other sessions in this TechEd can be found in Ahmed Salijee blog, who is developer evangelist in Microsoft Africa and arranges this event.
See you there.
June 12th, 2008 · Comments (8)
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