On Mon, Jan 31, 2022 at 7:15 PM Murphy, Sean <sean.mur...@centauricorp.com> wrote:
> 1. Creating 60,000 QObjects in a single thread appears to be slow [...] > Ehm, maybe I'm not understanding something, but why do you need objects to begin with? > The actual loop is this: > // generate each tile with its assignment > [snip] > What's the significance of the tiles? As far as I can tell from your requirements, you don't care about the "true geometry" of the data. At least to me it seems you want something like (pseudo algorithm): 1) Start QThread::idealThreadCount threads (QThread::create<> / std::thread) 2) Each thread works on "total samples" / QThread::idealThreadCount buffers that are completely independent. 2.1) Each thread goes through each sample from a partially mapped (from the file) buffer, takes the min/max to get the dynamic range 2.2) Sync the threads to get the global min/max 2.3) Go through each of the buffers a second time to normalize the dynamic range (again no tiles involved, just samples) 3) Done. Note: As each thread works on its own piece of data in both cases there's no sync required at any one point - you just read/write different parts of the same thing. Which is true both for when you load/write from/to a file and from/to memory. What am I missing here? Kind regards, Konstantin.
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