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PCM_ACCEL_README.md

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Purpose:

Intel® Xeon® Scalable Processors UNCORE accelerator(start from 4th Gen Intel® Xeon® Scalable Processor (codenamed Sapphire Rapids)) including Intel® In-Memory Analytics Accelerator (Intel® IAA), Intel® Data Streaming Accelerator (Intel® DSA) and Intel® QuickAssist Technology (Intel® QAT), etc are key feature of Intel® Xeon® Scalable Processors that can benefit the Intel architecture platform performance in the data center industry.

The accelerator and related software stack can be a key contributor to data center system performance, but sometimes it’s NOT easy for customer/user to get/understand the performance data of the accelerator like utilization, throughput, etc since low level hardware event sets is complex to understand without the deep knowledge of the accelerator hardware/software architecture.

This pcm-accel tool will sample the performance data from accelerator hardware and show it to end user in an easy-to-understanding format.

The goal is to help the user to quickly and accurately see a high-level performance picture or identify issues related to accelerator with or without solid knowledge of it.

Command syntax:

pcm-accel [target] [options]

the target parameter

Notes: only 1 target is allowed to monitor.

target Default Description
-iaa yes Monitor the IAA accelerator.
-dsa no Monitor the DSA accelerator.
-qat no Monitor the QAT accelerator.

the options parameter

Notes: multiple options is allowed.

options Default Description
-numa no Print NUMA node mapping instead of CPU socket location.
-evt=[cfg.txt] opCode-xxx-accel.txt Specify the event config file name as cfg.txt.
- xxx is the cpu model id, for example 143 for sapphire rapid.
-silent no Silence information output and print only measurements
-csv[=file.csv] no Output compact CSV format to screen or a file in case filename is provided
-csv-delimiter=[value] no Set custom csv delimiter
-human-readable no Use human readable format for output (for csv only)
-i=[value] 0 Allow to determine number of iterations, default is 0(infinite loop) if not specified.
[interval] 3 Time interval in seconds (floating point number is accepted) to sample performance counters, default is 3s if not specified.

Examples:

This example prints IAA counters every second 10 times and exits

pcm-accel -iaa 1.0 -i=10 

This example saves IAA counters twice a second save IAA counter values to test.log in CSV format

pcm-accel -iaa 0.5 -csv=test.log           

This example prints IAA counters every 3 second in human-readable CSV format

pcm-accel -iaa -csv -human-readable

Prerequisites:

Linux* OS:

FreeBSD* OS:

Windows OS:

  • Install and load the required accelerator driver(iaa/dsa, qat driver, etc).

Notes:

  • QAT monitoring and NUMA node display feature is supported only on Linux OS!

Tool UI introduction:

Common indicator(Column field):

  • Accelerator = Accelerator device id.
  • Socket = CPU socket id where accelerator device is located.
  • NUMA Node = NUMA node that accelerator device belongs to.
  • Inbound_BW = Data throughput input to the accelerator device, unit is Bps(Bytes per second).
  • Outbound_BW = Data throughput output from the accelerator device, unit is Bps(Bytes per second).

Specific indicators related to IAA/DSA: 

  • ShareWQ_ReqNb = The number of request submitted to share work queue of accelerator.
  • DedicateWQ_ReqNb = The number of request submitted to dedicate work queue of accelerator.

image image

Specific indicators related to QAT:

  • util_comp0 = The utilization of the compress engine 0, unit is %.(Sapphire Rapids platform has 1 compress and 3 decompress engine per QAT device)

  • util_decomp0 = same as above for decompress engine 0.

  • util_decomp1 = same as above for decompress engine 1.

  • util_decomp2 = same as above for decompress engine 2.

  • util_xlt0 = same as above for translation engine 0.

    image

Event config file:

pcm-accel tool allows the user to customized the monitored performance events with the config file as advance feature.

Customize fields of cfg file:

  • ev_sel and ev_cat field for IAA/DSA monitor event.
  • ev_sel field for QAT monitor event. 
  • multiplier/divider is for event data display calculation.
  • vname is the event name string(column) displayed in the UI.

Please refer to the spec or code to learn more about the event mapping if you want to customize it.

Here is the content of the event cfg file(opCode-143-accel.txt as example)

image