Downgrade Tess 5 to 3 for performance boost?

[Evon O Smith]

I'm experiencing very slow performance since I upgraded from Tess 3 to Tess 5.  Should i downgrade to get better performance?  I won't be converting my handwriting anyway (since Tess is terrible at it) so it shouldn't be an issue right?

[Zdenko Podobny]

Hello,

you are not very specific (OS, HW, tesseract version, language data type, how did measure performance, etc), so it is difficult to help you. Seems like you skipped reading docs and searching the issue tracker, so I would suggest solving your problem with reading at least this information 

1. https://github.com/tesseract-ocr/tessdoc/blob/main/Benchmarks.md
   
2. https://github.com/tesseract-ocr/tesseract/issues/263
   

Zdenko

so 16. 4. 2022 o 1:31 Evon O Smith <strivingf...@gmail.com> napísal(a):

I'm experiencing very slow performance since I upgraded from Tess 3 to Tess 5.  Should i downgrade to get better performance?  I won't be converting my handwriting anyway (since Tess is terrible at it) so it shouldn't be an issue right?

--
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 tesseract-oc...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/5151bdcd-fab8-42f3-a99c-ac7e34a1a1ean%40googlegroups.com.

[Evon O Smith]

Thanks I did read those posts before posting.  I will go through them again.  I don't know how to run a benchmark but I am running Tess on Opensuse Leap 15.3 on a DL320e Gen 8 server.

[Zdenko Podobny]

What processor is there? Does it have support for Advanced Vector Extensions [1] , SSE etc?

[1] https://en.wikipedia.org/wiki/Advanced_Vector_Extensions

Zdenko

so 16. 4. 2022 o 15:06 Evon O Smith <strivingf...@gmail.com> napísal(a):

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/5b7687d0-7f59-4b83-9fb7-27c96d751716n%40googlegroups.com.

[Evon O Smith]

This is the processor I have.  Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz.  According to this site https://www.techpowerup.com/cpu-specs/xeon-e3-1220-v2.c1033, it supports AVE. 

[Zdenko Podobny]

Well according to that information it should support AVX and SSE4.2, so performance should be similar to 3.x...

Can you provide the output of "tesseract -v" from that server?

Zdenko

po 18. 4. 2022 o 15:24 Evon O Smith <strivingf...@gmail.com> napísal(a):

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/834724e3-5800-4dd6-b7dd-b9224c59e163n%40googlegroups.com.

[Evon O Smith]

Here's the output of 'tesseract -v'

` tesseract 5.1.0

leptonica-1.78.0

libgif 5.1.4 : libjpeg 8d (libjpeg-turbo 1.5.3) : libpng 1.6.34 : libtiff 4.0.9 : zlib 1.2.11 : libwebp 1.0.3

Found AVX

Found SSE4.1

Found OpenMP 201511` 

[Zdenko Podobny]

So you should get the same/similar speed of recognition as with 3.x version based on our test.

Maybe try to use OMP_THREAD_LIMIT=1 as most of openmp negative experience comes from linux.

Zdenko

po 18. 4. 2022 o 19:12 Evon O Smith <strivingf...@gmail.com> napísal(a):

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/22384dbd-81dc-4ab8-8554-74db12e4cc82n%40googlegroups.com.

[Evon O Smith]

I get this error when I use that command read_params_file: Can't open OMP_THREAD_LIMIT=1

Is it safe to assume I don't have openmp installed?

[Zdenko Podobny]

You wrote:

Found OpenMP 201511

Zdenko

po 18. 4. 2022 o 20:02 Evon O Smith <strivingf...@gmail.com> napísal(a):

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/99488ced-97ad-46b2-a861-71120882a5a4n%40googlegroups.com.

[Evon O Smith]

Don't know what did it but I updated my system and installed a package called openmpi and it works light lightning now.

[Zdenko Podobny]

Good to hear. BTW:  OMP_THREAD_LIMIT is the environment variable and not the tesseract parameter.

Zdenko

po 18. 4. 2022 o 22:37 Evon O Smith <strivingf...@gmail.com> napísal(a):

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/6eeb5732-d82d-431c-aaa0-571dde64646en%40googlegroups.com.