platinumthinker

Общая статистика:
```
sudo perf stat -g -- ./dgemm

      40002.711133      cpu-clock (msec)          #    4.000 CPUs utilized          
           430,879      context-switches          #    0.011 M/sec                  
             3,104      cpu-migrations            #    0.078 K/sec                  
             9,119      page-faults               #    0.228 K/sec                  
    59,508,881,346      cycles                    #    1.488 GHz                    
    43,869,839,589      instructions              #    0.74  insn per cycle <-- Менее 1 при полной загрузке всех ядер!!

platinumthinker

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

platinumthinker

Threads	1000 Msgs/sec	Miss L1 %	Miss LLC %	BMiss	IPC
4000	350	6.7	54	0.38	1.34
2000	400	6.3	49	0.44	1.39
1000	400	6.4	31	0.35	1.51
500	450	6.6	14	0.34	1.64
200	490	6.2	10	0.40	1.72
100	510	7.5	6.6	0.5	1.70
32	510	7.3	7	0.5	1.70
8	550	6.5	6.2	0.5	1.70

platinumthinker

id	CPU Family	CPU (cpu x core x thread)	RAM	Res shell	Res
elbrus	Elbrus	4C 1891ВМ8Я 800 MHz 4x4x1	DDR3 1600	12910	28710
boris	Yorkfield	Core 2 Quad Q8300 2.5GHz 1x4x1	DDR3 1333	105420	221796
alpha	Ivy Bridge	i5-3570K 3.40GHz 1x4x1	DDR3 1600 (2 channels)	172413	410515
anton	Sandy Bridge E	i7-3820 3.60GHz 1x4x2	DDR3 1600 (4 сhannels)	185185	459399
thinker	Haswell	i5-4590 3.30GHz 1x4x1	DDR3 1600 (2 channels)	357143	653885
ibm	Haswell	i3-4160 3.60GHz 1x2x2	????	357142
rabbit	Kaby Lake	i3-7100 3.90GHz 1x2x2	DDR4 2133 (2 channels)	476190	830651

platinumthinker

Run in console:

dd bs=1M count=256 if=/dev/zero of=test conv=fdatasync oflag=dsync

Disk	SATA Gb/s	Speed with oflag Mb/s	Speep without oflag Mb/s
Intel SSD 540S	1.5	43.4	106
Intel SSD 530 ( SSDSC2BW12 )	1.5	41	310

platinumthinker

Autorize from k8s pod:

export KUBE_TOKEN=$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)
curl -sSk -H "Authorization: Bearer $KUBE_TOKEN" https://$KUBERNETES_SERVICE_HOST:$KUBERNETES_PORT_443_TCP_PORT/api/v1/namespaces/$POD_NAMESPACE/

Connect to docker in minikube from host:

eval $(minikube docker-env)

platinumthinker

[Unit]
Description=CAPWAP Datapath element

[Service]
ExecStart=/usr/local/bin/capwap-dp -c /etc/ergw-capwap-node/capwap-dp.conf
ExecStartPost=/bin/ip link set tap0 up
ExecStartPost=/bin/ip addr add 192.168.85.1/24 dev tap0
Restart=always
Type=simple
;User=thinker

platinumthinker

Backup:

1. Create snapshot:

> nodetool snapshot thingsboard (or you cat set you namespace) Requested creating snapshot(s) for [all keyspaces] with snapshot name [1522059918232] and options {skipFlush=false} Snapshot directory: 1522059918232

2. Copy snapshot on another directory:

platinumthinker

#!/usr/bin/env escript

-include_lib("kernel/include/inet.hrl").
-include_lib("kernel/include/inet_sctp.hrl").

main([Protocol, IP, Port, Len, Cnt]) ->
    bench(list_to_atom(Protocol), inet:parse_address(IP),
	  list_to_integer(Port), list_to_integer(Len), list_to_integer(Cnt));
main(_) ->
    io:format("invalid arguments~n~n"),

platinumthinker

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import re
import socketserver
import http.server
from http import HTTPStatus

regex = re.compile(r"^(\S+)\s*(\S+)$")

class Handler(http.server.SimpleHTTPRequestHandler):