khatwaniNikhil’s gists

khatwaniNikhil / javaMultiTreadingPart2.md

Created November 5, 2023 18:13 — forked from yclim95/javaMultiTreadingPart2.md

Java Multi-Threading Part II

#Java Multi-Threading Part II

##Lesson4 : Thread Pools

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/*
 * Thread Pools => Managing Lock Threads @ same time

khatwaniNikhil / javaMultiTreadingPart1.md

Created November 5, 2023 18:12 — forked from yclim95/javaMultiTreadingPart1.md

Java Multi-Threading Part I

#Java Multi-Threading Part I

##Lesson1 : Basic Threads ###1. Extends Thread

/*
 * Basic Threads
 * Run Concurently(Simultaneously)
 */

khatwaniNikhil / commands.json

Created April 3, 2023 16:48 — forked from vjeffz/commands.json

A list of all the aws-cli command examples from https://docs.aws.amazon.com/cli/latest/reference/

This file has been truncated, but you can view the full file.

	{
	"acm": {
	"AddTagsToCertificate": [
	"aws acm add-tags-to-certificate --certificate-arn arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012 --tags Key=Admin,Value=Alice Key=Purpose,Value=Website "
	],
	"DeleteCertificate": [
	"aws acm delete-certificate --certificate-arn arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012 "
	],
	"DescribeCertificate": [
	"aws acm describe-certificate --certificate-arn arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012 "

khatwaniNikhil / gist:2398f456d593a98eb5abf5ce08e42f39

Created March 5, 2021 09:34

Java Native memory leak analysis

	Native Leak example 1
	******************************************************************************
	https://technology.blog.gov.uk/2015/12/11/using-jemalloc-to-get-to-the-bottom-of-a-memory-leak/

	leak
	1GB in java.util.zip.Inflater.inflateBytes -> inflate -> updatewindow.

	solution
	stopped the decompression of frontend assets by

khatwaniNikhil / gist:147acdb23b99780b0a977dccf4246eee

Created March 5, 2021 09:30

Python Script - Calculate stack memory used by a Java process (made changes to https://github.com/apangin/jstackmem)

	sudo python ./jstackmem.py 2495

	#!/usr/bin/python
	# -- coding: utf-8 --
	import os
	import bisect
	import re
	import subprocess
	import sys

khatwaniNikhil / gist:8ed23f7ece454edbadf2f68c3892c377

Created February 14, 2021 07:19

Java Profiling Notes

	******************************************************************************************************************************************
	async profiler

	1 installation
	https://github.com/jvm-profiling-tools/async-profiler

	2 for memory profiling, install java debug symbols
	https://www.javaadvent.com/2014/12/recompiling-the-java-runtime-library-with-debug-symbols.html
	https://gist.github.com/khatwaniNikhil/694e44e7c939d96848b23afd5693b175

khatwaniNikhil / debug_jdk.xml

Created February 14, 2021 07:05 — forked from cdman/debug_jdk.xml

Ant script to recompile the JDK runtime with full debug symbols

	<project name="create rt_debug.jar" default="makejar" basedir=".">
	<target name="init">
	<property environment="env"/>
	<property name="project.build" location="build"/>
	<property name="project.src" location="${project.build}/src"/>
	<property name="project.classes" location="${project.build}/classes"/>
	<property name="project.dist" location="${project.build}/dist"/>
	<path id="project.classpath">
	<fileset dir="${env.JAVA_HOME}/jre/lib">
	<include name="*.jar"/>

khatwaniNikhil / README.md

Created May 4, 2018 13:23 — forked from leonardofed/README.md

A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

OP: @leonardofed founder @ plainflow.

Nikhil Khatwani khatwaniNikhil