Documentation

Performance Specifications

This section describes only the performance specifications of the Ascend AI Processor of each product, which may differ based on the memory and CPU configurations of the respective product. For details about the product performance specifications, see the official descriptions at the Ascend community.

This section takes a single Ascend AI Processor as an example to describe the performance specifications in basic scenarios, as shown in the table below. The performance at other resolutions can be estimated in the same way.

In the following table, one channel corresponds to one thread, 720p indicates a resolution of 1280 × 720 pixels, 1080p indicates a resolution of 1920 × 1080 pixels, and 4K indicates a resolution of 3840 × 2160 pixels.

Performance Specifications (Atlas inference products)

The following performance data is based on the host server configuration: Intel(R) Xeon(R) CPU E5-2680 v4@2.40 GHz as the CPU frequency, with 14 CPU cores.

Table 1 Ascend AI Processor performance specifications of the Atlas inference products

Scenario

Total Frame Rate

n-channel 720p (1 ≤ n ≤ 12)

n × 480 FPS

For Atlas 300V video analysis cards, when 1 < n ≤ 12, the total frame rate is n × 400 FPS.

n-channel 720p (n > 12)

5760 FPS

For Atlas 300V video analysis cards, when n > 12, the total frame rate is 4800 FPS.

n-channel 1080p (1 ≤ n ≤ 12)

n × 240 FPS

For Atlas 300V video analysis cards, when 1 < n ≤ 12, the total frame rate is n × 200 FPS.

n-channel 1080p (n > 12)

2880 FPS

For Atlas 300V video analysis cards, when n > 12, the total frame rate is 2400 FPS.

n-channel 4K (1 ≤ n ≤ 12)

n × 60 FPS

n-channel 4K (n > 12)

720 FPS
The following table describes the memory usage of each VDEC channel in typical scenarios. The memory usage is calculated as follows:
  • Buffer size for the input streams: input stream width × input stream height × 2.
  • Frame buffer size for the decoded images: 3 MB when resolution = 1080p. For other resolutions, convert the value proportionally.
  • TMV buffer size for the decoded images: 0.5 MB for H.264 1080p input streams; 1 MB for H.265 1080p input streams. For other resolutions, convert the value proportionally.
  • Number of reference frames: Call aclvdecSetChannelDescRefFrameNum to set the value.
  • Number of buffered frames after decoding: 2

Formula

Scenario

Memory Usage

6 MB + Buffer size for the input streams × 2 + (Frame buffer size for the decoded images + TMV buffer size for the decoded images) × (Number of reference frames + Number of buffered frames after decoding + 1)
  • Input stream format: H.264
  • Input stream resolution: 1080p
  • Buffer size for the input streams: 4 MB
  • Frame buffer size for the decoded images: 3 MB
  • TMV buffer size for the decoded images: 0.5 MB
  • Number of buffered frames after decoding: 2

52.5 MB (eight reference frames)

31.5 MB (two reference frames)
  • Input stream format: H.265
  • Input stream resolution: 1080p
  • Buffer size for the input streams: 4 MB
  • Frame buffer size for the decoded images: 3 MB
  • TMV buffer size for the decoded images: 1 MB
  • Number of buffered frames after decoding: 2

58 MB (eight reference frames)

34 MB (two reference frames)

Performance Specifications (Atlas training products)

Table 2 Ascend AI Processor performance specifications of the Atlas training products

Scenario

Total Frame Rate

n-channel 4-process 1080p (n ≤ 32)

n × 30 × 4 FPS

n-channel 4-process 4K (n ≤ 8)

n × 30 × 4 FPS
The following table uses 1080p input streams as an example to describe the formula for calculating the maximum memory used by each VDEC channel. The memory usage is calculated as follows:
  • Buffer size for the input streams: 6 MB when resolution ≤ 1080p; 9 MB when resolution > 1080p.
  • Frame buffer size for the decoded images: 3 MB when resolution = 1080p. For other resolutions, convert the value proportionally.
  • TMV buffer size for the decoded images: 0.5 MB for H.264 1080p input streams; 1 MB for H.265 1080p input streams. For other resolutions, convert the value proportionally.
  • Number of reference frames: The maximum number of reference frames is used as an example. The system adapts to the actual number.

Formula

Scenario

Memory Usage

4 MB + Buffer size for the input streams × 2 + (Frame buffer size for the decoded images + TMV buffer size for the decoded images) × (Number of reference frames + 1)
  • Input stream format: H.264
  • Input stream resolution: 1080p
  • Buffer size for the input streams: 6 MB
  • Frame buffer size for the decoded images: 3 MB
  • TMV buffer size for the decoded images: 0.5 MB

51 MB (nine reference frames)

26.5 MB (two reference frames)
  • Input stream format: H.265
  • Input stream resolution: 1080p
  • Buffer size for the input streams: 6 MB
  • Frame buffer size for the decoded images: 3 MB
  • TMV buffer size for the decoded images: 1 MB

56 MB (nine reference frames)

28 MB (two reference frames)

Performance Specifications (Atlas 200I/500 A2 inference products)

Table 3 Ascend AI Processor performance specifications of the Atlas 200I/500 A2 inference products

Scenario

Total Frame Rate

n-channel 720p (1 ≤ n ≤ 4)

n × 600 FPS

n-channel 720p (n > 4)

2400 FPS

n-channel 1080p (1 ≤ n ≤ 4)

n × 300 FPS

n-channel 1080p (n > 4)

1200 FPS

n-channel 4K (1 ≤ n ≤ 4)

n × 75 FPS

n-channel 4K (n > 4)

300 FPS
The following table describes the memory usage of each VDEC channel in typical scenarios. The memory usage is calculated as follows:
  • Buffer size for the input streams: input stream width × input stream height × 2.
  • Frame buffer size for the decoded images: 3 MB when resolution = 1080p. For other resolutions, convert the value proportionally.
  • TMV buffer size for the decoded images: 0.5 MB for H.264 1080p input streams; 1 MB for H.265 1080p input streams. For other resolutions, convert the value proportionally.
  • Number of reference frames: Call aclvdecSetChannelDescRefFrameNum to set the value.
  • Number of buffered frames after decoding: 2

Formula

Scenario

Memory Usage

6 MB + Buffer size for the input streams × 2 + (Frame buffer size for the decoded images + TMV buffer size for the decoded images) × (Number of reference frames + Number of buffered frames after decoding + 1)
  • Input stream format: H.264
  • Input stream resolution: 1080p
  • Buffer size for the input streams: 4 MB
  • Frame buffer size for the decoded images: 3 MB
  • TMV buffer size for the decoded images: 0.5 MB
  • Number of buffered frames after decoding: 2

52.5 MB (eight reference frames)

31.5 MB (two reference frames)
  • Input stream format: H.265
  • Input stream resolution: 1080p
  • Buffer size for the input streams: 4 MB
  • Frame buffer size for the decoded images: 3 MB
  • TMV buffer size for the decoded images: 1 MB
  • Number of buffered frames after decoding: 2

58 MB (eight reference frames)

34 MB (two reference frames)

Performance Specifications (Atlas A2 training products/Atlas A2 inference products)

Table 4 Ascend AI Processor performance specifications of the Atlas A2 training products/Atlas A2 inference products

Scenario

Total Frame Rate

n-channel 720p (1 ≤ n ≤ 2)

n × 480 FPS

n-channel 720p (n > 2)

960 FPS

n-channel 1080p (1 ≤ n ≤ 2)

n × 240 FPS

n-channel 1080p (n > 2)

480 FPS

n-channel 4K (1 ≤ n ≤ 2)

n × 60 FPS

n-channel 4K (n > 2)

120 FPS
The following table describes the memory usage of each VDEC channel in typical scenarios. The memory usage is calculated as follows:
  • Buffer size for the input streams: input stream width × input stream height × 2.
  • Frame buffer size for the decoded images: 3 MB when resolution = 1080p. For other resolutions, convert the value proportionally.
  • TMV buffer size for the decoded images: 0.5 MB for H.264 1080p input streams; 1 MB for H.265 1080p input streams. For other resolutions, convert the value proportionally.
  • Number of reference frames: Call aclvdecSetChannelDescRefFrameNum to set the value.
  • Number of buffered frames after decoding: 2

Formula

Scenario

Memory Usage

6 MB + Buffer size for the input streams × 2 + (Frame buffer size for the decoded images + TMV buffer size for the decoded images) × (Number of reference frames + Number of buffered frames after decoding + 1)
  • Input stream format: H.264
  • Input stream resolution: 1080p
  • Buffer size for the input streams: 4 MB
  • Frame buffer size for the decoded images: 3 MB
  • TMV buffer size for the decoded images: 0.5 MB
  • Number of buffered frames after decoding: 2

52.5 MB (eight reference frames)

31.5 MB (two reference frames)
  • Input stream format: H.265
  • Input stream resolution: 1080p
  • Buffer size for the input streams: 4 MB
  • Frame buffer size for the decoded images: 3 MB
  • TMV buffer size for the decoded images: 1 MB
  • Number of buffered frames after decoding: 2

58 MB (eight reference frames)

34 MB (two reference frames)
Parent topic: VDEC
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