Question on the jai execution chain

I have an execution chain as follows:
TIFFImage--> wrapnull --> forceComponent --> setLayout -->lookup --> setLayout --> scale --> errordiffusion
where I create my own operator "forceComponent" and implement computeRect() method in it. I found during hte excution of the chain, my computeRect() method was called 27 times. Any reason why this happened?
Thanks,

Just a guess, are you calling the computeRect() in your paint or paintComponent methods?

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I have questions about the chain step name in DEFINE_CHAIN_STEP:
1. Can the step name be a number (e.g. "8")?
2. Should the step name be unique within a chain or across all chains?
I am having this exception:
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After I changed the step names (in DEFINE_CHAIN_STEP), the chain seems to run fine.
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The reason I asked about the step name is to confirm it can handle numbers (it looks it can handle it from the doc).
Why I changed the step names say from "11" to "21", the error goes away, that puzzled me. Because the way I defined steps and the rules for the steps were exactly the same. Just changing the step names made the error goes away?!
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I have a question about the order of the execution of java code.
class myclass
String str1 = new String("str1");
static String str2 = new String("str2");
static
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myclass( )
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hello,
I think there may be one thing can't use println to make sure.
class myclass
static { System.out.println("str1"); };
myclass() { System.out.println("str2"); }
then str1 appear before str2
class myclass
static { String str1 = new String("str1"); };
myclass() { String str2 = new String("str2"); }
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str1 initilized before str2,
str1 get the value str1----->after<----- str2.
Am I right or wrong?

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Hello,
i am just trying to unterstand what advandages the High Troughput Math Funtions have. So i have to ask some Questions.
I always talk about beeing inside a SCTL.
1. In the Image you can see four Add Functions. One with U32 which should use more Ressouces than the one with the U16Datatype which uses mor than the U8. But does my FXP High Througput Math Function use less Ressources than the U8 Version?
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With kind regards
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Solved!
Go to Solution.

I don't see a big rush to answer this, so I'll give it a shot:
1. The HT version uses less resources, but only because it is configured with the smallest data types. You should get exactly the same results with the same data types and an Add function. The only difference with the HT version is the ability to specify an output register, and the handshaking signals that account for that delay. IF the add is implemented in a DSP48, the integrated register can result in better timing, but in practice it is usually equivalent to an Add function followed by a feedback node.
2. The actual delay through an add is proportional to the number of bits, where the critical path is the sequentially computed carry chain. So you could run the last one at the highest clock rate. The FPGA has dedicated fast carry logic, so the difference isn't too significant.
3. The first one will be VERY slightly smaller and faster, just because you're computing one extra output bit on the second one.
4. I would expect the speed to depend only on the number of DSP48s used, so the last 3 should be similar. You'd be likely to see different results in practice, though, due to routing differing numbers of bits to registers for the indicators. This assumes you're not taking advantage of any of the pipelining configuration options in the HT Multiply. Those options, and the associated handshaking signals, are really what differentiates the HT versions from the regular numeric functions. They allow you to achieve higher clock rates and throughput at the expense of latency (ie, it will take more clock cycles to produce a valid result but you can get more data through the function in a given amount of time).
Caveats: All your examples have constant inputs, so the LabVIEW compiler and/or Xilinx tools can and will optimize them to no ops. Small multiplies, multiplies with one constant input, or those just larger than 25x18 may also use some non-DSP48 logic for all or part of the implementation. Note that the HT palettes provide a DSP48E function in case you want control over exactly how a multiply and/or add gets implemented. Placing and routing can result in unexpected behaviors, so estimating timing is much more difficult than simply adding up component delays.

How to get the Server Certificate Chain File?

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Question on the jai execution chain

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