You limit number of used threads by environment variable. E.g. set before running demo program this:
set OMP_NUM_THREADS=1 or use omp_set_num_threads[1] function within your program. [1] https://gcc.gnu.org/onlinedocs/libgomp/omp_005fset_005fnum_005fthreads.html Zdenko st 18. 12. 2024 o 9:50 Xingtong Chen <[email protected]> napísal(a): > Apologize for my unclear expression. There are 2 tesseracts on my machine: > > 1. One is built from the github release (5.5.0). I use the > --disable-openmp flag to conigure and I get a build without multithread. > > 2. I install libtesseract5 (5.3.0-2 amd64) from debian apt and the api > head file is in my /usr/include folder. I compile a demo using g++ with > version “gcc version 12.2.0 (Debian 12.2.0-14)”.When I run the executable > file, the process use 4 threads on my machine. > > I find it by checking htop command results. > > I just tried using OpenMP to perform multithreaded recognition operations > with tesseract::TessBaseAPI* (using libtesseract5), but it seems the > multithreading effect has disappeared. That's weird to me. > > Thank you for your patience ;) > > 在2024年12月17日星期二 UTC-8 22:43:21<zdenop> 写道： > >> So you build the tesseract library without openmp, but when you use it >> (by calling api) multithreading is there? >> Do I understand you correctly? How did you find it out? >> >> Zdenko >> >> >> st 18. 12. 2024 o 6:43 Xingtong Chen <[email protected]> napísal(a): >> >>> In tesseract document, I found that if I need to disable multithread, I >>> need the configure option >>> >>> ../../configure --disable-openmp >>> >>> This works well on my machine. >>> >>> But I still cannot figure out how to disable multithread tesseract when >>> using teseract api. >>> >>> I have tried -DOPENMP_SIMD_FALSE, but this didn't work. Is there any >>> compile flag to disable openmp? >>> >>> I use g++ compiler with version "gcc version 12.2.0 (Debian 12.2.0-14)". >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "tesseract-ocr" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion visit >>> https://groups.google.com/d/msgid/tesseract-ocr/554ec663-9411-4844-8fbf-8939c84fe594n%40googlegroups.com >>> <https://groups.google.com/d/msgid/tesseract-ocr/554ec663-9411-4844-8fbf-8939c84fe594n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > You received this message because you are subscribed to the Google Groups > "tesseract-ocr" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/tesseract-ocr/acc5239c-cd91-4110-9825-479467105598n%40googlegroups.com > <https://groups.google.com/d/msgid/tesseract-ocr/acc5239c-cd91-4110-9825-479467105598n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/tesseract-ocr/CAJbzG8y%3DU0Lt-0kcaNkVj%3D4vak%2B5n7BPd0-HJcBht10MqN2xuw%40mail.gmail.com.
