The following tables list the pre-defined metric set configurations available
for memory modules. In the xrt.ini
file all of
these metric names should be in lower case and assigned to the metric selector
aie_profile_memory_metrics
.
Metric Name | Event ID | Description |
---|---|---|
Memory Conflict | 76 | Time taken due to data memory conflicts on any of the 8 banks of the
memory module. Note: The
hardware view is 8 banks of 128 bit width. The software view
is 4 banks of 256 width.
|
Cumulative Memory Errors | 86 | Time taken due to ECC errors in any of the Data Memory banks, as well as the 2x MM2S and the 2x S2MM DMAs. |
Memory conflicts happen when two memory chunks reside in the same memory bank and are accessed either by the same AI Engine (using the two read ports) or by two different AI Engines. A potential solution is to constrain the locations of these memories to different banks. In order to get more details about which bank is causing these conflicts, you should analyze the events from an emulation-AI Engine simulation.
Metric Name | Event ID | Description |
---|---|---|
Cumulative DMA Activity | 20 | Time taken due to stalled lock acquires on both the MM2S and S2MM channels of the DMA. |
Cumulative DMA Lock Count | 43 | Lock Stall count on the DMA channels. |
The four DMA channels (2xS2MM and 2xMM2S) are driven by Buffer Descriptors (BDs). The Cumulative DMA Activity is a count of the time taken due to stalled lock acquire events on all channels. All these DMA events will help you understand why some connections through the device are slower than expected.
Metric Name | Event ID | Description |
---|---|---|
S2MM Channel 0 Stalls | 33 | Time S2MM channel 0 was stalled on lock acquire. |
S2MM Channel 1 Stalls | 34 | Time S2MM channel 1 was stalled on lock acquire |
Metric Name | Event ID | Description |
---|---|---|
MM2S Channel 0 Stalls | 35 | Time the MM2S channel 0 stalled on lock acquire. |
MM2S Channel 1 Stalls | 36 | Time the MM2S channel 1 stalled on lock acquire. |
Metric Name | Event ID | Description |
---|---|---|
DMA S2MM Channel 0 Packet Count | 25 | Number of packets written over DMA S2MM channel 0. |
DMA S2MM Channel 1 Packet Count | 26 | Number of packets written over DMA S2MM channel 1. |
Bandwidth of DMA S2MM channel 0 | Derived | Write bandwidth over DMA S2MM Channel 0. This bandwidth is computed with respect to the active time. |
Bandwidth of DMA S2MM channel 1 | Derived | Write bandwidth over DMA S2MM Channel 1. This bandwidth is computed with respect to the active time. |
These metrics allow you to understand how efficiently the DMA S2MM are used.
Metric Name | Event ID | Description |
---|---|---|
DMA MM2S Channel 0 Packet Count | 27 | Number of packets read from DMA MM2S channel 0. |
DMA MM2S Channel 1 Packet Count | 28 | Number of packets read from DMA MM2S channel 1. |
Bandwidth of DMA MM2S channel 0 | Derived | Read bandwidth over DMA MM2S Channel 0. This bandwidth is computed with respect to the active time. |
Bandwidth of DMA MM2S channel 1 | Derived | Read bandwidth over DMA MM2S Channel 1. This bandwidth is computed with respect to the active time. |
These metrics allow you to understand how efficiently the DMA MM2S are used.