justdoit0823

# rtt
tshark -r tcpdump_outfile -Tfields -e frame.time_relative -e tcp.analysis.ack_rtt|awk -F'\t' 'length($2) > 0 {print $2}'

# rto
tshark -r tcpdump_outfile -Tfields -e frame.time_relative -e tcp.analysis.rto|awk -F'\t' 'length($2) > 0 {print $2}'

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# replace 10.73 with your own network and 15138 with port
ss -ti|grep -E '10.73.[[:digit:]]{2,3}.[[:digit:]]{2,3}:15138' -A 1|grep 'ESTAB' -A 1|grep -v -- --|awk '{if(index($0, "ESTAB")) {h = $5} if(index($0, "rtt")) {split($4, a, "rtt:"); split(a[2], b, "/"); if(b[1] > r[h]) {r[h] = b[1]}}} END {for(h in r) print h, r[h]}'

justdoit0823

# total threads memory
grep -A 2 'stack:' /proc/$PID/smaps|grep Rss|awk '{m += $2} END {print m}'

# top ten threads
grep -A 2 'stack:' /proc/$PID/smaps|grep -v -- '--'|awk '{if(index($0, "stack")) {split($NF, a, "stack:"); split(a[2], b, "]"); s[i++] = b[1]} if(index($0, "Rss")) {v[b[1]] = $2}} END {for(t in s) print s[t], v[s[t]]}'|sort -k 2 -nr|head

justdoit0823

import java.util.Arrays;
import java.util.List;

public class PrimitiveType {

  public static void main(String[] args) {
    byte[] x = new byte[]{1};
    char[] y = new char[]{1, 2};
    int[] z = new int[]{1};
    long[] j = new long[]{1L};

justdoit0823

import java.util.Arrays;
import java.util.List;

class DefaultClassShow {
  
  public static void main(String... args) {
    byte[] b = new byte[]{1, 2, 3};
    char[] c = new char[]{1, 2, 3};

justdoit0823

Property Priority

1. Devtools global settings properties in the $HOME/.config/spring-boot folder when devtools is active.
2. @TestPropertySource annotations on your tests.
3. properties attribute on your tests. Available on @SpringBootTest and the test annotations for testing a particular slice of your application.
4. Command line arguments.
5. Properties from SPRING_APPLICATION_JSON (inline JSON embedded in an environment variable or system property).
6. ServletConfig init parameters.
7. ServletContext init parameters.

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import java.net.NetworkInterface;
import java.util.Enumeration;

public class ListInterfaces {

  public static void main(String[] args) {
    try {
      Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
      while (interfaces.hasMoreElements()) {
        System.out.println("interface " + interfaces.nextElement().getName());

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from kafka import KafkaConsumer, TopicPartition


def get_topic_offsets(bootstrap_servers, topic, n_partition, ts):
    consumer = KafkaConsumer(bootstrap_servers=bootstrap_servers)
    return consumer.offsets_for_times({TopicPartition(topic, i): ts for i in range(n_partition)})

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import bs4
import requests


def parse_ts(s):
    s = s.strip()
    v, unit = s.split(' ')[:2]
    v = float(v)
    if unit == 'ms':

justdoit0823

#include "stdio.h"
#include "numpy/arrayobject.h"
#include "numpy/ufuncobject.h"

// compile with comamnd `gcc -I/usr/local/lib/python3.6/site-packages/numpy/core/include $(python3.6m-config --cflags) test_ufunc_type_size.c`

int main(int argc, char * argv[]) {
  printf("ufunc type size is %ld.\n", sizeof(PyUFuncObject));
  return 0;