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Starting with DetectorPack 3.10, a utility was added to the VT LPR add-on (see Installing DetectorPack add-ons), which allows you to create GPU neural network caches without using Axxon One. The presence of the cache speeds up the initialization and optimizes video memory consumption.

To optimize the operation of the License plate recognition VT on GPU, do the following:

1. Stop the server (see 
Stopping the server
2. Starting and stopping the Axxon One Server in Linux OS).
   

   Note
   title Attention!
   If the system has the software running on GPU,

it is necessary to

3. you must stop its operation.

4. Login as ngp superuser:

   1. In the command prompt, run the command:

      Code Block
      language bash
      sudo su ngp

   2. Enter the password for the

root

5. 1. superuser.

6. Create a folder with a custom name to store the cache. For example:

   Code Block
   language bash
   mkdir /opt/AxxonSoft/AxxonOne/gpucache

7. Change folder permissions:

   Code Block
   language bash
   chmod -R 777 /opt/AxxonSoft/AxxonOne/gpucache

Create the GPU_CACHE_DIR system variable:

9. Go to the /opt/AxxonSoft/AxxonOne

/ folder

10.  folder:

    Code Block
    language bash
    cd /opt/AxxonSoft/AxxonOne

11. Open the

instance.conf

12. server configuration file for editing:

    Code Block
    language bash
    nano instance.conf

    Note
    title Attention!
    When you use the server in failover mode, you must: Open the /etc/AxxonSoft folder: Code Block cd /etc/AxxonSoft Open the server configuration file for editing: Code Block nano axxon-one.conf Info title Note

Add the following line to the file:

13. Before you make the changes to the axxon-one.conf file, we recommend reading the instructions on the page Creating system variables for the Axxon One server in the failover mode in Linux OS. Add the GPU_CACHE_DIR system variable in the configuration file, wherethevaluewillspecify the pathto the cachelocationfolder. For example: Code Block export GPU_CACHE_DIR="/opt/AxxonSoft/AxxonOne/gpucache" Save the changes in the file. Add the GPU_CACHE_DIR system variable in the /etc/profile file. Code Block export GPU_CACHE_DIR="/opt/AxxonSoft/AxxonOne/gpucache" Run the command: Code Block source /etc/profile

14. Add the GPU_CACHE_DIR system variable,wherethevaluewillspecify the pathto the cachelocationfolder. For example:
    

    Code Block

Code Blocklanguagebash

15. export GPU_CACHE_DIR="/opt/AxxonSoft/AxxonOne/gpucache"

16. Save the server configuration file using the Ctrl+O keyboard shortcut.

17. Exit file editing mode using the Ctrl+X keyboard shortcut.
    

    Note
    title Attention!

If

18. When you change the server configuration (

see 

19. see Changing the configuration of the Axxon One Server in Linux OS) or update to

a

20. the new

version of

21. Axxon One version, the system variables previously added to the instance.conf configuration file will be deleted (

see 

22. see Creating system variables for the Axxon One server in Linux OS).

23. Save the file using the Ctrl+O keyboard shortcut.

24. Exit file editing mode using the Ctrl+X keyboard shortcut.

Run the following command in the terminal
25. In the command prompt, run the command that was usedtoadd the systemvariablewiththepathto the cache location folder. For example:
    

    Code Block

language	bash

26. export GPU_CACHE_DIR="/opt/AxxonSoft/AxxonOne/gpucache"

27. Go to the /opt/AxxonSoft/DetectorPack/ folder:
    

    Code Block

languagebash

28. cd /opt/AxxonSoft/DetectorPack

29. Run the following command:

    Code Block
    language bash
    ./VTGpuCacheGenerator

30. Enter the required
countries in
31. countries in the numeric or alphabetic form.
    

    Expand
    title Expand the list of countries
    0. ad (Andorra) 1. al (Albania) 2. am (Armenia) 3. ar (Argentina) 4. at (Austria) 5. au (Australia) 6. az (Azerbaijan) 7. ba (Bosnia and Herzegovina) 8. be (Belgium) 9. bg Bulgaria 10. bh (Bahrain) 11. bn (Brunei) 12. bo (Bolivia) 13. br (Brazil) 14. bw (Botswana) 15. by (Belarus) 16. ca (Canada) 17. ch (Switzerland) 18. cl (Chile) 19. co (Colombia) 20. cz (Czech Republic) 21. de (Germany) 22. dk (Denmark) 23. dz (Algeria) 24. ec (Ecuador) 25. ee (Estonia) 26. es (Spain) 27. fi (Finland) 28. fr (France) 29. gb (Great Britain) 30. ge (Georgia) 31. gr (Greece) 32. gt (Guatemala) 33. hk (Hong Kong) 34. hn (Honduras) 35. hr (Croatia) 36. hu (Hungary) 37. id (Indonesia) 38. il (Israel) 39. in (India) 40. ir (Iran) 41. it (Italy) 42. jo (Jordan) 43. ke (Kenya) 44. kg (Kyrgyzstan) 45. kr (Republic of Korea) 46. kz (Kazakhstan) 47. li (Liechtenstein) 48. lk (Sri Lanka) 49. lt (Lithuania) 50. lu (Luxembourg) 51. lv (Latvia) 52. mc (Monaco) 53. md (Moldavia) 54. me (Montenegro) 55. mn (Mongolia) 56. mt (Malta) 57. mx (Mexico) 58. my (Malaysia) 59. ng (Nigeria) 60. ni (Nicaragua) 61. nl (Netherlands) 62. no (Norway) 63. nz (New Zealand) 64. pa (Panama) 65. pe (Peru) 66. ph (Philippines) 67. pl (Poland) 68. pt (Portugal) 69. py (Paraguay) 70. ro (Romania) 71. rs (Serbia) 72. ru (Russia) 73. se (Sweden) 74. sg (Singapore) 75. si (Slovenia) 76. sk (Slovakia) 77. su (USSR) 78. sv (El Salvador) 79. tj (Tajikistan) 80. tm (Turkmenistan) 81. tn (Tunisia) 82. tr (Turkey) 83. tw (Taiwan) 84. ua (Ukraine) 85. us (USA) 86. uy (Uruguay) 87. uz (Uzbekistan) 88. vn (Vietnam) 89. za (Republic of South Africa) 90. zm (Jamaica)

32. After you select all required countries, enter done.
33. The default
resolution
34. frame width is
1920x1080
35. 1920 pixels. If
you want to change the resolution
36. necessary, enterthe y value and the required
resolution
37. frame width. For example,
 
38. 2048.
39. To leave the default value, enter n.
    
40. Specify the minimum width of the license plate according to the actual size of the license plate in the frame as a percentage. The minimum allowed value is 0, the maximum value is 100.
    
41. Specify the ID of the required GPU (see Selecting Nvidia GPU when configuring detectors).
42. Press Enter.

As a result, the process of creating cache starts, which takes about 30 minutes. The duration of the process depends on the selected types of cache, number of countries, and Nvidia GPU model.

Optimizing the operation of the License plate recognition VT on GPU is complete.