thrust | based cross-platform / cross-language application framework
kandi X-RAY | thrust Summary
kandi X-RAY | thrust Summary
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Trending Discussions on thrust
QUESTION
I am trying to use thrust with Opencv classes. The final code will be more complicated including using device memory but this simple example does not build successfully.
...ANSWER
Answered 2021-Jun-14 at 14:06As pointed out in the comments, for the code you have shown, you are getting a warning and this warning can be safely ignored.
For usage in CUDA device code:
For a C++ class to be usable in CUDA device code, any relevant member functions that will be used explicitly or implicitly in CUDA device code, must be marked with the __device__
decorator. (There are a few exceptions e.g. for defaulted constructors which don't apply here.)
The OpenCV class you are attempting to use (cv::KeyPoint
), doesn't meet these requirements for use in device code. It won't be usable as-is.
There may be a few options:
Recast your work using
cv::KeyPoint
to use some class that provides similar functionality, that you write yourself, in such a way as to be properly designed and decorated.Perhaps see if OpenCV built with CUDA has an alternate version here (properly designed/decorated) (my guess would be it probably doesn't)
Rewrite OpenCV itself, taking into account all necessary design changes to allow the
cv::KeyPoint
class to be usable in device code.As a variant of suggestion 1, copy the relevant data
.response
to a separate set of classes or just a bare array, and do your selection work based on that. The selection work done there can be used to "filter" the original array.
QUESTION
This https://aws.amazon.com/blogs/storage/architecting-for-high-availability-on-amazon-s3/#:~:text=Amazon%20S3%20maintains%20redundancy%20even%20within%20one%20of,can%20still%20access%20their%20data%20with%20no%20downtime states the following:
Amazon S3 storage classes replicate their data on more than three Availability Zone (except for S3 One Zone-Infrequent Access).
What's the point of this article https://aws.amazon.com/blogs/startups/large-scale-disaster-recovery-using-aws-regions/ stating:
S3 snapshots: We rely on the cross s3 sync and this works like a charm. We are able to copy the data from our primary to the DR region within a matter of few minutes.
The latter seem superfluous now and is from 2017, so may be it is out-dated? Or is it the thrust that we should also be be placing Amazon S3 copies over over Regions? I see no such need as the AZ's within a Region are physically separated from each other. What am I missing?
...ANSWER
Answered 2021-Jun-11 at 13:30S3 buckets are region specific. When you create a new bucket you need to select the target region for that bucket.
For DR reasons, you can keep backups in another region. Should the primary region fail in a way that the entire region is affected, then you could restore in the backup region.
Your DR strategy will depend on your use case, and your needs for returning services back to normal in case of region wide failure.
For example, let's say you rely on ec2/ebs to operate your service and those services suffer region wide outage for 5 hours. In order to recover your service you would need to move to a region where the resources are available. Assuming you need S3 data for operational processing you would want to have that data ready in the Target recovery region.
QUESTION
I have a custom CUDA extension for pytorch (https://pytorch.org/tutorials/advanced/cpp_extension.html), which used to work fine with pytorch1.4, CUDA10.1, and Titan Xp GPUs. However, recently we changed our system to new A40 GPUs and CUDA11.1. When I try to build my custom pytorch extension using CUDA11.1, pytorch 1.8.1, gcc 9.3.0, and Ubuntu 20.04 I get the following errors:
...ANSWER
Answered 2021-May-10 at 13:55I found the issue. The Intel MKL module wasn't loaded properly and caused the error. After fixing this the compilation worked just fine also with CUDA 11.1 and pytorch 1.8.1!
QUESTION
I have a pretty long string(called 'my_string') without new lines included. I have been trying to use regexp in JavaScript to find specific words in 'my_string'. Below is the code description
...ANSWER
Answered 2021-May-10 at 13:40Other than a few minor mistakes in your regex, you need to use .+?
instead of .+
, because the second one is "greedy" which means, it will match as much as it can get.
QUESTION
I am making a basic lunar lander program in visual basic using windows forms. I have a track bar to adjust thrust. I am also using WASD to control the landers direction. WASD works fine if I haven't used the track bar to adjust the thrust. But the moment I adjust the thrust the trackbar becomes selected and I cannot use the WASD keys anymore. What do I need to do to fix this issue?picture of program
...ANSWER
Answered 2021-May-07 at 08:11To expand on Ahmed's comment, if you set KeyPreview to true then the form will experience the key events before any selected control on the form does.
QUESTION
***
...ANSWER
Answered 2021-May-05 at 02:51forceDirection.Normalize()
alters the forceDirection
vector and returns void
, rather than returning the normalized vector. So you'll need to split the Normalize()
call and the multiplication into separate statements:
QUESTION
when I'm running this piece of code, the compiler says I'm calling a host function from global function. I want to assing something a bit more complicated than zeros to A[i] and B[i] but I just wanted to test the functionality. I need to modify values in both vectors. Later I'd like to reduce the table A.
...ANSWER
Answered 2021-May-04 at 20:52In spite of its naming, a thrust::device_vector
is not directly usable in CUDA device code. The device_vector
is an object/container, and it is intended to be usable in host code only. This is why you get the messages about "calling a host function..."
For the example you have shown here, to access the data directly, you would (in host code) extract device pointers to the underlying data in each container (A
and B
) and pass those pointers to your CUDA kernel.
Something like this:
QUESTION
I think I'm close but also missing something fundamental here with SwiftUI and passing data.
- I have a top-level Color var called "masterColor" which I house in my "DataModel" struct.
- Then in my view "NightLight", I have a system "ColorPicker", where I use a local var "localColor" to reflects whatever value the ColorPicker has.
- Finally I have a "BackgroundControllerView", which sets a background color (which I would like to read the dataModel.masterColor)
What I'm trying to do set the dataModel.masterColor (which my whole app can see) equal to my localColor, which only NightLight can see. I've simplified the structure here a bit but the thrust of the question is about how to take local data and set something global equal to it for the rest of the app to see.
...ANSWER
Answered 2021-May-02 at 17:07There's no need to have a separate localColor
. You can directly pass in $dataModel.masterColor
to the picker.
QUESTION
I tried to make a device functor that essentially performs (unoptimized) matrix-vector multiplication like so
...ANSWER
Answered 2021-Apr-23 at 11:50Forgot to use ceil
when calculating grid dimensions.
QUESTION
I am a newbie with CUDA. I have read that it is necesary to allocate variables with cudaMalloc and then use cudaMemcpy to copy the values to the device variables. Something like this:
...ANSWER
Answered 2021-Apr-20 at 15:54Thrust does all CUDA API calls for you. So while you can use Thrust algorithms on manually allocated memory or pass the memory from a thrust::device_vector
to a kernel, you don't need cudaMalloc
and cudaMemcpy
, as everything is already included in the standard C++ vector interface.
The memory allocated by thrust::device_vector
lives on the GPU (if you are using one. One can use Thrust for parallelizing on the CPU as well). So the constructor calls cudaMalloc
for you.
For data transfer you can use different thrust::device_vector
s and thrust::host_vectors
like normal std::vector
s (e.g. constructors and operator=
are implemented for the different combinations). Thrust knows what to do with each type of vector and will call cudaMemcpy
for you. If this isn't explicit enough for you, you can also use thrust::copy
.
Your code could look the following way:
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