技术

Deep learning memo

by 
1
2
3

import netron
modelPath = "models.onnx"
netron.start(modelPath)

then browse to http://localhost:8080.
onnx to trt

1

./trtexec --onnx=Resnet34_3inputs_448x448_20200609.onnx --saveEngine=Resnet34_3inputs_448x448_20200609.trt --workspace=6000

TensorRT docs https://docs.nvidia.com/deeplearning/tensorrt/api/c_api/classnvinfer1_1_1_i_runtime.html

Precision of time_since_epoch

by 
1
2

#include <chrono>
uint64_t timestamp = std::chrono::system_clock::now().time_since_epoch().count();

'timestamp' is in ns, not in us(μs or microsecond).

1
2
3
4
5
6

1 s = 1000 ms
1 ms = 1000 μs
1 μs = 1000 ns
1 ns = 1000 ps
 
2 GHz = 2 x 10^9 Hz, its 1 circle has 0.5 ns long.

Build protobuf in Windows

by 
git clone https://github.com/protocolbuffers/protobuf.git
cd protobuf
git submodule update --init --recursive

mkdir bld
cd bld
cmake -G "Visual Studio 16 2019" -DCMAKE_INSTALL_PREFIX=%CD%/installed -Dprotobuf_BUILD_TESTS=OFF -Dprotobuf_BUILD_SHARED_LIBS=ON ../cmake/

If the project which we link with the protobuf.so complains "libprotobuf.so.22 is not found", it means we build protobuf in another way, through ./configure.

Cpu Affinity

by

from 宋宝华:
https://www.toutiao.com/article/6937097613720191520/

1
2
3
4
5
6
7
8
9
10
11
12

# grub.cfg, cpu order number starts from 0.
	linux ... isolcpus=2
 
# bash
taskset -cp 2 662
cat /proc/interrupts
cat /proc/irq/44/smp_affinity
 
# make menuconfig
NO_HZ_FULL
NO_HZ_IDLE
Documentation/timers/no_hz.rst

Could NOT find CARES

by

When I built wireshark in ubuntu, it emitted this error.

The correct packages to install are

1
2
3
4
5

sudo apt install libgcrypt20-dev libc-ares-dev libpcap-dev
mkdir bld
cd bld
cmake .. -DCMAKE_INSTALL_PREFIX=`pwd`/installed -DCMAKE_PREFIX_PATH=/home/work/3rdParty/qt/5.15.2/gcc_64
#.

VS Code memo

by

launch.json

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

{
	"version": "0.2.0",
	"configurations": [
		{
			"name": "dbg a.out",
			"type": "cppdbg",
			"request": "launch",
			"program": "${workspaceRoot}/path/to/a.out",
			"args": [
				"-b",
				"sim"
			],
			"stopAtEntry": false,
			"cwd": "${workspaceRoot}/path/to/",
			"environment": [
				{
					"name": "LD_LIBRARY_PATH",
					"value": "./:${workspaceRoot}/path/to/:/usr/local/cuda-11.1/lib64"
				},
				{
					"name": "GST_DEBUG_DUMP_DOT_DIR",
					"value": "/home/work/tmp"
				}
			],
			"externalConsole": false,
			"MIMode": "gdb",
			"setupCommands": [
				{
					"description": "Enable pretty-printing for gdb",
					"text": "-enable-pretty-printing",
					"ignoreFailures": true
				}
			]
		},
		{
			"name": "C++ Attach (GDB)",
			"type": "cppdbg",
			"request": "attach",
			"targetArchitecture": "x64",
			"program": "${workspaceRoot}/path/to/a.out",
			"processId": "${command:pickProcess}"
		}
	]
}

Don't translate tab to spaces,

1

File -> Preferences -> Settings -> Text Editor -> Insert Spaces / Detect Indentation

Display std::string or std::vector content

1

-exec -enable-pretty-printing

Build FFMpeg in Windows

by

In MSYS2 x64 bash,

pacman -S mingw-w64-x86_64-toolchain
pacman -S base-devel
pacman -S yasm nasm gcc

basedir=/d/work/open

cd ${basedir}/x264
./configure --prefix=${basedir}/x264_install --enable-static --extra-cflags="-O0 -g3" --enable-debug
make
make install

cd ${basedir}/ffmpeg
./configure --prefix=${basedir}/ffmpeg_install --enable-static --disable-shared --extra-cflags=-I${basedir}/x264_install/include --extra-ldflags=-L${basedir}/x264_install/lib
make
make install

refer to:
http://events.jianshu.io/p/53ecc4dbe7d0
https://www.videolan.org/developers/x264.html
http://ffmpeg.org/download.html
https://www.msys2.org/
https://git-scm.com/download/win