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README.md

Performance Monitor (perfmon) example

(See the README.md file in the upper level 'examples' directory for more information about examples.)

Overview

This example illustrates usage of perfmon APIs to monitor and profile functions. The example will calculate performance statistic for simple test function. The simple test function could be exchanged to one from the user.

The example contain test function that will be executed with perfmon component and collect CPU statistic. The test function will be executed 200 times in each test case. The first test case collect statistic from all available performance counters, and second test just from defined in the list.

How to use example

Hardware Required

Example should be able to run on any commonly available ESP32 development board.

Configure the project

make menuconfig
  • Set serial port under Serial Flasher Options.

Build and Flash

Enter make -j4 flash monitor if you are using GNU Make based build system or enter idf.py build flash monitor if you' are using CMake based build system.

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

  1. Example starts and call first test. The first test call test function 'exec_test_function'

I (288) example: Start I (288) example: Start test with printing all available statistic Value = 750, select = 0, mask = 0001. Counts cycles. Amount of cycles Value = 0, select = 1, mask = 0001. Overflow of counter. Overflow counter Value = 0, select = 2, mask = 0001. Successfully Retired Instructions.

              JX instructions

Value = 0, select = 2, mask = 0002. Successfully Retired Instructions.

              CALLXn instructions

Value = 3, select = 2, mask = 0004. Successfully Retired Instructions.

              return instructions (RET, RETW, ...)

Value = 0, select = 2, mask = 0008. Successfully Retired Instructions.

              supervisor return instructions (RFDE, RFE, RFI, RFWO, RFWU)

Value = 100, select = 2, mask = 0010. Successfully Retired Instructions.

              Conditional branch instructions where execution
              transfers to the target (aka. taken branch),
               or loopgtz/loopnez instr where execution skips
               the loop (aka. not-taken loop)

Value = 0, select = 2, mask = 0020. Successfully Retired Instructions.

              J instr

Value = 1, select = 2, mask = 0040. Successfully Retired Instructions.

              CALLn instr

Value = 0, select = 2, mask = 0080. Successfully Retired Instructions.

              Conditional branch instr where execution
               falls through (aka. not-taken branch)

Value = 0, select = 2, mask = 0100. Successfully Retired Instructions.

              Loop instr where execution falls into loop (aka. taken loop)

Value = 0, select = 2, mask = 0400. Successfully Retired Instructions.

              Last inst of loop and execution transfers
               to LBEG (aka. loopback taken)

Value = 0, select = 2, mask = 0800. Successfully Retired Instructions.

              Last inst of loop and execution falls
               through to LEND (aka. loopback fallthrough)

Value = 309, select = 2, mask = 8000. Successfully Retired Instructions.

              Non-branch instr (aka. non-CTI)

Value = 0, select = 3, mask = 0002. Data-related GlobalStall cycles. Store buffer full stall Value = 0, select = 3, mask = 0004. Data-related GlobalStall cycles. Store buffer conflict stall Value = 0, select = 3, mask = 0008. Data-related GlobalStall cycles. Data Cache-miss stall (unused) Value = 0, select = 3, mask = 0010. Data-related GlobalStall cycles. Data RAM/ROM/XLMI busy stall Value = 0, select = 3, mask = 0020. Data-related GlobalStall cycles. Data inbound-PIF request stall (includes s32c1i) Value = 0, select = 3, mask = 0040. Data-related GlobalStall cycles. MHT lookup stall Value = 0, select = 3, mask = 0080. Data-related GlobalStall cycles. Uncached load stall (included in MHT lookup stall below) Value = 0, select = 3, mask = 0100. Data-related GlobalStall cycles. Bank-conflict stall Value = 0, select = 4, mask = 0001. Instruction-related and Other Glob alStall cycles. ICache-miss stall Value = 0, select = 4, mask = 0002. Instruction-related and Other Glob alStall cycles. Instruction RAM/ROM busy stall Value = 0, select = 4, mask = 0004. Instruction-related and Other Glob alStall cycles. Instruction RAM inbound-PIF request stall Value = 0, select = 4, mask = 0008. Instruction-related and Other Glob alStall cycles. TIE port stall Value = 0, select = 4, mask = 0010. Instruction-related and Other Glob alStall cycles. External RunStall signal status Value = 0, select = 4, mask = 0020. Instruction-related and Other Glob alStall cycles. Uncached fetch stall Value = 1, select = 4, mask = 0040. Instruction-related and Other Glob alStall cycles. FastL32R stall Value = 0, select = 4, mask = 0080. Instruction-related and Other Glob alStall cycles. Iterative multiply stall Value = 0, select = 4, mask = 0100. Instruction-related and Other Glob alStall cycles. Iterative divide stall Value = 0, select = 5, mask = 0001. Exceptions and Pipeline Replays. Other Pipeline Replay (i.e. excludes cache miss etc.) Value = 0, select = 5, mask = 0002. Exceptions and Pipeline Replays. Level-1 interrupt Value = 0, select = 5, mask = 0004. Exceptions and Pipeline Replays. Greater-than-level-1 interrupt Value = 0, select = 5, mask = 0008. Exceptions and Pipeline Replays. Debug exception Value = 0, select = 5, mask = 0010. Exceptions and Pipeline Replays. NMI Value = 0, select = 5, mask = 0020. Exceptions and Pipeline Replays. Window exception Value = 0, select = 5, mask = 0040. Exceptions and Pipeline Replays. Allocate exception Value = 0, select = 5, mask = 0080. Exceptions and Pipeline Replays. Other exceptions Value = 0, select = 5, mask = 0100. Exceptions and Pipeline Replays. HW-corrected memory error Value = 0, select = 6, mask = 0001. Hold and Other Bubble cycles. Processor domain PSO bubble Value = 0, select = 6, mask = 0004. Hold and Other Bubble cycles. R hold caused by Data Cache miss(unused) Value = 0, select = 6, mask = 0008. Hold and Other Bubble cycles. R hold caused by Store release Value = 0, select = 6, mask = 0010. Hold and Other Bubble cycles. R hold caused by register dependency Value = 0, select = 6, mask = 0020. Hold and Other Bubble cycles. R hold caused by MEMW, EXTW or EXCW Value = 0, select = 6, mask = 0040. Hold and Other Bubble cycles. R hold caused by Halt instruction (TX only) Value = 322, select = 6, mask = 0080. Hold and Other Bubble cycles. CTI bubble (e.g. branch delay slot) Value = 0, select = 6, mask = 0100. Hold and Other Bubble cycles. WAITI bubble i.e. a cycle spent in WaitI power down mode. Value = 417, select = 7, mask = 0001. Instruction TLB Accesses (per inst ruction retiring). ITLB Hit Value = 0, select = 7, mask = 0002. Instruction TLB Accesses (per inst ruction retiring). Replay of instruction due to ITLB miss Value = 0, select = 7, mask = 0004. Instruction TLB Accesses (per inst ruction retiring). HW-assisted TLB Refill completes Value = 0, select = 7, mask = 0008. Instruction TLB Accesses (per inst ruction retiring). ITLB Miss Exception Value = 0, select = 8, mask = 0001. Instruction Memory Accesses (per i nstruction retiring). Instruction Cache Hit Value = 0, select = 8, mask = 0002. Instruction Memory Accesses (per i nstruction retiring). Instruction Cache Miss Value = 420, select = 8, mask = 0004. Instruction Memory Accesses (per i nstruction retiring). All InstRAM or InstROM accesses Value = 0, select = 8, mask = 0008. Instruction Memory Accesses (per i nstruction retiring). Bypass (i.e. uncached) fetch Value = 3, select = 9, mask = 0001. Data TLB Accesses. DTLB Hit Value = 0, select = 9, mask = 0002. Data TLB Accesses. Replay of load/store due to DTLB miss Value = 0, select = 9, mask = 0004. Data TLB Accesses. HW-assisted TLB Refill completes Value = 0, select = 9, mask = 0008. Data TLB Accesses. DTLB Miss Exception Value = 0, select = 10, mask = 0001. Load Instruction (Data Memory). Data Cache Hit(unused) Value = 0, select = 10, mask = 0002. Load Instruction (Data Memory). Data Cache Miss(unused) Value = 3, select = 10, mask = 0004. Load Instruction (Data Memory). Load from local memory i.e. DataRAM, DataROM, InstRAM, InstROM

Value = 0, select = 10, mask = 0008. Load Instruction (Data Memory). Bypass (i.e. uncached) load Value = 0, select = 13, mask = 0001. Load Instruction (Data Memory). Data Cache Hit(unused) Value = 0, select = 13, mask = 0002. Load Instruction (Data Memory). Data Cache Miss(unused) Value = 0, select = 13, mask = 0004. Load Instruction (Data Memory). Load from local memory i.e. DataRAM, DataROM, InstRAM, InstROM

Value = 0, select = 13, mask = 0008. Load Instruction (Data Memory). Bypass (i.e. uncached) load Value = 0, select = 16, mask = 0001. Load Instruction (Data Memory). Data Cache Hit (unused) Value = 0, select = 16, mask = 0002. Load Instruction (Data Memory). Data Cache Miss (unused) Value = 0, select = 16, mask = 0004. Load Instruction (Data Memory). Load from local memory i.e. DataRAM, DataROM, InstRAM, InstROM

Value = 0, select = 16, mask = 0008. Load Instruction (Data Memory). Bypass (i.e. uncached) load Value = 0, select = 11, mask = 0001. Store Instruction (Data Memory). Data Cache Hit (unused) Value = 0, select = 11, mask = 0002. Store Instruction (Data Memory). Data Cache Miss (unused) Value = 0, select = 11, mask = 0004. Store Instruction (Data Memory). Store to local memory i.e. DataRAM, InstRAM Value = 0, select = 11, mask = 0008. Store Instruction (Data Memory). PIF Store Value = 0, select = 14, mask = 0001. Store Instruction (Data Memory). Data Cache Hit(unused) Value = 0, select = 14, mask = 0002. Store Instruction (Data Memory). Data Cache Miss(unused) Value = 0, select = 14, mask = 0004. Store Instruction (Data Memory). Store to local memory i.e. DataRAM, InstRAM Value = 0, select = 14, mask = 0008. Store Instruction (Data Memory). PIF Store Value = 0, select = 17, mask = 0001. Store Instruction (Data Memory). Data Cache Hit (unused) Value = 0, select = 17, mask = 0002. Store Instruction (Data Memory). Data Cache Miss (unused) Value = 0, select = 17, mask = 0004. Store Instruction (Data Memory). Store to local memory i.e. DataRAM, InstRAM Value = 0, select = 17, mask = 0008. Store Instruction (Data Memory). PIF Store Value = 0, select = 12, mask = 0001. Accesses to Data Memory (Load, Sto re, S32C1I, ...). Cache Miss Value = 0, select = 15, mask = 0001. Accesses to Data Memory (Load, Sto re, S32C1I, ...). Cache Miss Value = 0, select = 18, mask = 0001. Accesses to Data Memory (Load, Sto re, S32C1I, ...). Cache Miss Value = 415, select = 22, mask = 0001. Multiple Load/Store. 0 stores and 0 loads Value = 3, select = 22, mask = 0002. Multiple Load/Store. 0 stores and 1 loads Value = 0, select = 22, mask = 0004. Multiple Load/Store. 1 stores and 0 loads Value = 0, select = 22, mask = 0008. Multiple Load/Store. 1 stores and 1 loads Value = 0, select = 22, mask = 0010. Multiple Load/Store. 0 stores and 2 loads Value = 0, select = 22, mask = 0020. Multiple Load/Store. 2 stores and 0 loads Value = 0, select = 23, mask = 0001. Outbound PIF. Castout Value = 0, select = 23, mask = 0002. Outbound PIF. Prefetch Value = 0, select = 24, mask = 0001. Inbound PIF. Data DMA Value = 0, select = 24, mask = 0002. Inbound PIF. Instruction DMA Value = 0, select = 26, mask = 0001. Prefetch. I prefetch-buffer-lookup hit Value = 0, select = 26, mask = 0002. Prefetch. D prefetch-buffer-lookup hit Value = 0, select = 26, mask = 0004. Prefetch. I prefetch-buffer-lookup miss Value = 0, select = 26, mask = 0008. Prefetch. D prefetch-buffer-lookup miss Value = 0, select = 26, mask = 0020. Prefetch. Direct fill to (L1) Data Cache (unused) Value = 0, select = 27, mask = 0001. iDMA. active cycles Value = 0, select = 28, mask = 0001. Length of Instructions. 16-bit Value = 0, select = 28, mask = 0002. Length of Instructions. 24-bit Value = 0, select = 28, mask = 0004. Length of Instructions. 32-bit Value = 0, select = 28, mask = 0008. Length of Instructions. 40-bit Value = 0, select = 28, mask = 0010. Length of Instructions. 48-bit Value = 0, select = 28, mask = 0020. Length of Instructions. 56-bit Value = 0, select = 28, mask = 0040. Length of Instructions. 64-bit Value = 0, select = 28, mask = 0080. Length of Instructions. 72-bit Value = 0, select = 28, mask = 0100. Length of Instructions. 80-bit Value = 0, select = 28, mask = 0200. Length of Instructions. 88-bit Value = 0, select = 28, mask = 0400. Length of Instructions. 96-bit Value = 0, select = 28, mask = 0800. Length of Instructions. 104-bit Value = 0, select = 28, mask = 1000. Length of Instructions. 112-bit Value = 0, select = 28, mask = 2000. Length of Instructions. 120-bit Value = 0, select = 28, mask = 4000. Length of Instructions. 128-bit ```

  1. Example calls second test.

I (1588) example: Start test with user defined statistic Value = 743, select = 0, mask = 0001. Counts cycles. Amount of cycles Value = 417, select = 2, mask = 8dff. Successfully Retired Instructions.

              JX instructions
              CALLXn instructions
              return instructions (RET, RETW, ...)
              supervisor return instructions (RFDE, RFE, RFI, RFWO, RFWU)
              Conditional branch instructions where execution
              transfers to the target (aka. taken branch),
               or loopgtz/loopnez instr where execution skips
               the loop (aka. not-taken loop)
              J instr
              CALLn instr
              Conditional branch instr where execution
               falls through (aka. not-taken branch)
              Loop instr where execution falls into loop (aka. taken loop)
              Last inst of loop and execution transfers
               to LBEG (aka. loopback taken)
              Last inst of loop and execution falls
               through to LEND (aka. loopback fallthrough)
              Non-branch instr (aka. non-CTI)

Value = 3, select = 10, mask = 0004. Load Instruction (Data Memory). Load from local memory i.e. DataRAM, DataROM, InstRAM, InstROM

Value = 0, select = 11, mask = 0004. Store Instruction (Data Memory). Store to local memory i.e. DataRAM, InstRAM Value = 321, select = 6, mask = 01ed. Hold and Other Bubble cycles. Processor domain PSO bubble R hold caused by Data Cache miss(unused) R hold caused by Store release R hold caused by MEMW, EXTW or EXCW R hold caused by Halt instruction (TX only) CTI bubble (e.g. branch delay slot) WAITI bubble i.e. a cycle spent in WaitI power down mode. Value = 0, select = 6, mask = 0010. Hold and Other Bubble cycles. R hold caused by register dependency Value = 0, select = 1, mask = 0001. Overflow of counter. Overflow counter I (1788) example: The End

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