Performance Tooling Guidance

[yorkie]

Currently only supports the following platform:

• aarch64
• armhf

Simpleperf

Download simpleperf, 32-bit version is available at here.

Then run the following commands to get report:

$ simpleperf record -g \
  -p <your process pid> \
  --duration 10 # the sample recording duration, 10 means 10 seconds

recommend set the duration to 30s.

When you gets the above commands finished, you would get the file data.perf under your working directory.

Report

Just run:

simpleperf report --dsos <your libiotjs.so> -n -g

Then you would get the following reports:

Cmdline: /data/simpleperf record -p 25021 --duration 30 -g
Arch: arm64
Event: cpu-cycles (type 0, config 0)
Samples: 408
Error Callchains: 1, 0.245098%
Event count: 132030003

Children  Self    Command  Pid    Tid    Shared Object                                    Symbol
36.82%    36.82%  iotjs    25021  25021  /usr/lib/libiotjs.so                             jmem_heap_alloc_block_internal
36.82%    0.00%   iotjs    25021  25021  /usr/lib/libiotjs.so                             jmem_heap_gc_and_alloc_block
       |
       -- jmem_heap_gc_and_alloc_block
          |
           -- jmem_heap_alloc_block_internal
19.65%    13.81%  iotjs    25021  25021  /usr/lib/libiotjs.so                             ecma_gc_run
       |
       -- ecma_gc_run
          |
          |--41.27%-- ecma_gc_run
          |
          |--12.78%-- jmem_heap_free_block
          |
          |--1.60%-- ecma_gc_get_object_next.isra.4
          |
          |--1.58%-- jmem_decompress_pointer
          |
           --1.50%-- @plt
8.88%     8.88%   iotjs    25021  25021  /usr/lib/libiotjs.so                             @plt
8.24%     2.43%   iotjs    25021  25021  /usr/lib/libiotjs.so                             ecma_gc_mark
       |
       -- ecma_gc_mark
          |
          |--22.78%-- ecma_gc_set_object_visited.isra.2
          |
          |--20.82%-- ecma_gc_mark
          |
          |--17.72%-- ecma_gc_mark_property
          |
          |--7.67%-- @plt
          |
          |--2.57%-- jmem_decompress_pointer
          |
          |--2.56%-- ecma_get_property_list
          |
           --2.56%-- ecma_get_lex_env_type
6.13%     6.13%   iotjs    25021  25021  /usr/lib/libiotjs.so                             jmem_heap_free_block
3.75%     2.21%   iotjs    25021  25021  /usr/lib/libiotjs.so                             vm_loop