edeNFed

#!/usr/bin/python
# @lint-avoid-python-3-compatibility-imports
#
# profile  Profile CPU usage by sampling stack traces at a timed interval.
#          For Linux, uses BCC, BPF, perf_events. Embedded C.
#
# This is an efficient profiler, as stack traces are frequency counted in
# kernel context, rather than passing every stack to user space for frequency
# counting there. Only the unique stacks and counts are passed to user space
# at the end of the profile, greatly reducing the kernel<->user transfer.

djfdyuruiry

Enable systemd in WSL 2

NOTE: If you have Windows 11 there is now an official way to do this in WSL 2, use it if possible - see MS post here (WINDOWS 11 ONLY)

This guide will enable systemd to run as normal under WSL 2. This will enable services like microk8s, docker and many more to just work during a WSL session. Note: this was tested on Windows 10 Build 2004, running Ubuntu 20.04 LTS in WSL 2.

• To enable systemd under WSL we require a tool called systemd-genie

• Copy the contents of install-sg.sh to a new file /tmp/install-sg.sh:

kolobaev

package seriesList

import (
	"fmt"
	"math"
	"strconv"

	"github.com/go-graphite/carbonapi/expr/helper"
	"github.com/go-graphite/carbonapi/expr/interfaces"
	"github.com/go-graphite/carbonapi/expr/types"

MarioHewardt

By default, EBPF programs will not run on WSL2 due to required kernel modules missing. The following example error is an 
indication of this problem:
  modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.19.84-microso
  ft-standard/modules.dep.bin'
  modprobe: FATAL: Module kheaders not found in directory /lib/modules/4.19.84-microsoft-standard
  chdir(/lib/modules/4.19.84-microsoft-standard/build): No such file or directory

To fix this you need to rebuild the WSL2 kernel with the missing kernel modules. The below instructions are for Ubuntu 18.04 WSL2.

1. git clone https://github.com/microsoft/WSL2-Linux-Kernel.git

narendrans

FROM centos:7

RUN yum install -y python3 python3-devel python3-pip unixODBC unixODBC-devel python3-setuptools gcc gcc-c++ https://download.dremio.com/odbc-driver/dremio-odbc-LATEST.x86_64.rpm && \
	pip3 install apache-superset sqlalchemy_dremio && \
	export LC_ALL=en_US.UTF-8 && \
	superset db upgrade && \
	superset init && \
	export FLASK_APP=superset && \
	flask fab create-admin --username admin --firstname admin --lastname admin --email admin@admin --password admin

alexey-milovidov

SELECT 
    count(), 
    arrayStringConcat(arrayMap(x -> concat(demangle(addressToSymbol(x)), '\n    ', addressToLine(x)), trace), '\n') AS sym
FROM system.trace_log
WHERE (query_id = 'ebca3574-ad0a-400a-9cbc-dca382f5998c') AND (event_date = today())
GROUP BY trace
ORDER BY count() DESC
LIMIT 10

Row 1:

alexey-milovidov

Счётчики, метрики и трейспоинты в ClickHouse (черновик).

Мотивация

В ClickHouse разным образом реализовано некоторое количество функциональности, имеющей общие черты. Это:

• метрики на основе инкрементальных счётчиков (ProfileEvents);
• метрики на основе количества одновременных процессов (Metrics);
• метрики на основе асинхронно получаемых значений (AsynchronousMetrics);
• ограничения на сложность выполнения запроса (встроены в Settings);
• прогресс выполнения запроса (Progress, отправляется клиенту);

jjo

#!/bin/sh
# Launch a Pod ab-using a hostPath mount to land on a Kubernetes node cluster as root
# without requiring `privileged: true`, in particular can abuse `DenyExecOnPrivileged`
# admission controller.
# Pod command in turn runs a privileged container using node's /var/run/docker.sock.
node=${1}
case "${node}" in
"")
    nodeSelector=''
    podName=${USER+${USER}-}docker-any

timvisee

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

• There are always 24 hours in a day.
• February is always 28 days long.
• Any 24-hour period will always begin and end in the same day (or week, or month).

kanekv

# -*- ksh -*-
#
# If you use the GNU debugger gdb to debug the Python C runtime, you
# might find some of the following commands useful.  Copy this to your
# ~/.gdbinit file and it'll get loaded into gdb automatically when you
# start it up.  Then, at the gdb prompt you can do things like:
#
#    (gdb) pyo apyobjectptr
#    <module 'foobar' (built-in)>
#    refcounts: 1