#ifstatement

[lifelonglearnerr]

¡Aprende a dominar el poder del condicional 'if' en PHP! 💪✨ Esta poderosa declaración te permite tomar decisiones en tu código según ciertas condiciones. 🤔💻 Ya sea que quieras validar datos, controlar el flujo de tu programa o personalizar la experiencia del usuario, el 'if' es tu mejor aliado. 🙌✨📝🌐

[qcs01]

System Monitoring and Performance Tuning in RHEL

Red Hat Enterprise Linux (RHEL) offers a variety of tools and best practices to monitor and optimize system performance. Here's a guide to help you get started with system monitoring, identifying performance bottlenecks, and tuning your RHEL system for optimal performance.

Monitoring System Performance with Built-in Tools

top: Displays real-time system summary information, including CPU usage, memory usage, and process information.

Command: top

htop: An enhanced version of top with a more user-friendly interface and additional features.

Install: yum install htop

Command: htop

vmstat: Reports information about processes, memory, paging, block IO, traps, and CPU activity.

Command: vmstat 1

iostat: Monitors system input/output device loading to help identify performance issues related to storage.

Install: yum install sysstat

Command: iostat

mpstat: Reports CPU statistics.

Install: yum install sysstat

Command: mpstat

sar: Collects, reports, or saves system activity information.

Install: yum install sysstat

Command: sar

free: Displays the amount of free and used memory in the system.

Command: free -m

netstat: Provides network-related information, including active connections and listening ports.

Command: netstat -tuln

ss: Another tool for examining network sockets and connections.

Command: ss -tuln

dstat: Combines the functionality of vmstat, iostat, netstat, and ifstat.

Install: yum install dstat

Command: dstat

Identifying and Resolving Performance Bottlenecks

CPU Bottlenecks:

Use top, htop, mpstat, and sar to monitor CPU usage.

Look for processes consuming high CPU and consider renicing or killing them if necessary.

Check for excessive context switching or CPU waits

Memory Bottlenecks:

Use free, vmstat, and sar to monitor memory usage.

Identify processes consuming large amounts of memory and consider optimization or additional hardware.

Monitor swap usage; excessive swapping indicates a need for more physical memory.

Disk I/O Bottlenecks:

Use iostat, vmstat, and sar to monitor disk I/O performance.

Look for high I/O wait times and high utilization of disk devices.

Consider using faster storage, RAID configurations, or optimizing disk-intensive applications.

Network Bottlenecks:

Use netstat, ss, and sar to monitor network performance.

Identify high network usage or dropped packets.

Optimize network configurations, upgrade network hardware, or balance the load across multiple interfaces.

Best Practices for Optimizing RHEL Performance

Regular Monitoring:

Set up regular monitoring and alerting using tools like Nagios, Zabbix, or Prometheus.

Review performance logs periodically to identify trends and potential issues.

Resource Allocation:

Ensure appropriate allocation of CPU, memory, and disk resources based on the workload.

Use cgroups to limit resource usage of processes and containers.

Kernel Tuning:

Tune kernel parameters using sysctl based on the workload requirements.

Example: Increase file descriptor limits for high-load web servers.

Command: sysctl -w fs.file-max=100000

Application Tuning:

Optimize applications for better performance.

Example: Configure web server settings for optimal concurrency and caching.

Regular Updates:

Keep the system and applications updated to benefit from performance improvements and bug fixes.

System Configuration:

Optimize system configurations, such as filesystem mount options and network settings.

Example: Use noatime mount option for filesystems to reduce disk I/O.

Capacity Planning:

Plan for future growth by regularly reviewing resource usage and projecting future needs.

Ensure the infrastructure can scale to meet increasing demands.

By utilizing these tools and best practices, you can effectively monitor and optimize the performance of your RHEL system.

[bpaeducators]

Master Excel 2019's coolest trick: the IF statement! 🎩📊 Learn how to make cells automatically display values based on specific conditions. 💻✨

#bpa #bpaeducators

#execlshortcut #datefunction

#Excel2019 #IFStatement #AutomateTasks

[msexcelvba]

How to use IF Formula

[techiio]

It takes time to master highly specialized and complex IT domains like software development and automation. But with time at a premium, you would often be required to deliver projects quickly. So, what do you do in that case? You look for simple solutions, right.

If you are tired of searching for easy-to-execute and straightforward steps to run the Github Actions Workflow, this post is for you. Because time is at a premium, we won't waste any more of it. Let's dive straight into the discussion.

[cndro]

Conditional statements in Python are used to decide the flow of execution of a program or code. In Python, conditional statements are handled with "IF". Click this link to learn the different IF statements in Python using a practical approach.⏬⏬⏬ https://cndro.com/blog/if-statements-in-python/ Follow @cndrollc for updates . . . . #pythonstring #pythonstudents #ifstatements #ifstatement #pythonprogrammingcourse #pythonprogram #python#ide #jupyter #pythoncodesnippets #pythonprogramminglanguages #webdevelopmentservices #discoverwithcndro https://www.instagram.com/p/CBiXcoDAPh9/?igshid=106oedy58gjt1

[heartcentrictech]

Let's talk about feature toggle today💁‍♀️ A feature toggle which is also called as feature switch, feature flag or conditional feature is a technique in software development to separate deployment from the release🔥and allow us to change the system behavior without changing the source code✨ We simply isolate the code block with an if statement which is our toggle to switch on or off depending on circumstances⚡️ The benefits of using feature toggle are reducing the deployment risks and merge conflicts whereas it could introduce a technical debt-dead code in case it has been used for a long time🙌 #heartcentrictech #heartcentrictechmentoring #featuretoggle #featureswitch #conditionalfeature #deadcode #softwaredevelopment #softwaredevelopers #tech #technology #featuretoggling #release #deployment #sourcecode #codeblock #ifstatement (at Stockholm, Sweden) https://www.instagram.com/p/CAxQ40hHJVk/?igshid=d11nkkbpo7u1

[lachlanjeastaugh-blog]

IF statements

Today we learnt about if statements, here is some of the code that we had to play around with 

A quick breakdown of this code basically means, if we are pushing the spacebar, the speed increases every tick at the rate of the current speed + the thrust value, however if its over the value of the maxThrust, then it will default to the maxThrust speed. 

If we are not pushing the spacebar down, the speed will decrease at the rate of current speed - the thrust value every tick. However, if the speed is below the minThrust value, it will simply default to that thereby giving it a minimum speed as well as the maximum.  However, things didnt always go to plan

Good thing I have this guy to sort things out with 

[sololinuxes]

Monitorizar el sistema con dstat

Monitorizar el sistema con dstat. Dstat es una excelente herramienta (escrita en python) que nos ofrece las estadísticas y datos sobre el uso del sistema. Esta aplicación reúne las mejores características de vmstat, iostat, netstat, nfsstat e ifstat. De hecho, podríamos atrevernos a decir que dstat supera alguna de las limitaciones de las herramientas mencionadas y agrega características adicionales, más contadores y flexibilidad. Dstat es útil para monitorear sistemas y depurar problemas, ya sea en sistemas de producción o en fase de pruebas. Una de las principales virtudes de "dstat" es que nos ofrece una salida legible para el ser humano, tanto en tiempo predefinido como en tiempo real. Una característica importante que nos ofrece el comando, es que nos permite enviar los datos recolectados a un archivo CSV, de forma que podamos analizar los datos de manera más minuciosa. Principales características: Combina vmstat, iostat, ifstat, netstat, etc... Muestra las estadísticas recolectadas bien organizadas cronológicamente. Nos permite habilitar y ordenar los contadores que necesitemos. Diseño modular. Permite ver resúmenes y totales de los dispositivos de red. Visualizar las interrupciones de un dispositivo. Es muy preciso incluso en un sistema sobrecargado. Muestra los valores tomados de manera exacta. Diferencia los tipos de valores por colores. Cuando por algún motivo existe un retraso en la medición, muestra los resultados intermedios. Permite exportar a CSV. Las opciones principales son las siguientes: -c, --cpu enable cpu stats -C 0,3,total include cpu0, cpu3 and total -d, --disk enable disk stats -D total,hda include hda and total -g, --page enable page stats -i, --int enable interrupt stats -I 5,eth2 include int5 and interrupt used by eth2 -l, --load enable load stats -m, --mem enable memory stats -n, --net enable network stats -N eth1,total include eth1 and total -p, --proc enable process stats -r, --io enable io stats (I/O requests completed) -s, --swap enable swap stats -S swap1,total include swap1 and total -t, --time enable time/date output -T, --epoch enable time counter (seconds since epoch) -y, --sys enable system stats --aio enable aio stats --fs, --filesystem enable fs stats --ipc enable ipc stats --lock enable lock stats --raw enable raw stats --socket enable socket stats --tcp enable tcp stats --udp enable udp stats --unix enable unix stats --vm enable vm stats --plugin-name enable plugins by plugin name (see manual) --list list all available plugins -a, --all equals -cdngy (default) -f, --full automatically expand -C, -D, -I, -N and -S lists -v, --vmstat equals -pmgdsc -D total --float force float values on screen --integer force integer values on screen --bw, --blackonwhite change colors for white background terminal --nocolor disable colors (implies --noupdate) --noheaders disable repetitive headers --noupdate disable intermediate updates --output file write CSV output to file  

Monitorizar el sistema con dstat

Normalmente dstat no viene instalada en ninguna distribución linux, pero si esta en sus repositorios oficiales. Su instalación es sencilla. Ubuntu, Debian, Linux Mint y derivados: sudo apt-get install dstat CentOS y derivados: yum install dstat Fedora: dnf install dstat OpenSuse, Suse y derivados: zypper in dstat   Una vez instalado vemos su sintaxis y algunos ejemplos de uso. Sintaxis de la herramienta: Usage: dstat ] Ejemplos de uso de dstat De manera predeterminada: dstat

Monitorizar el sistema con la herramienta dstat   Uso con "Vmstst": dstat -Vmstat

Monitorizar el sistema con dstat -Vmstat   Con las siguientes opciones monitorizamos... -c : uso de la cpu. –top-cpu : procesos que hacen uso de más cpu. -dn : estadísticas del disco de almacenamiento y la red. –top-mem : proceso que consume más memoria. dstat -c --top-cpu -dn --top-mem

Monitorizar el sistema con dstat - opciones   Para exportar los datos obtenidos de manera predeterminada a un archivo CSV, tan solo debes definir la ruta. dstat --output /home/sololinux/registro_dstat.csv También podemos definir los datos que queremos exportar, incluso el numero de lineas del monitoreo que queremos guardar en CSV (en el ejemplo definimos de la linea 1 a la 6) . dstat --time --cpu --mem --load --output report.csv 1 6

Exportar datos de dstat a csv   Como has podido comprobar es una excelente herramienta que todos deberíamos tener en cuanta, ademas tiene muchísimas extensiones y complementos. Puedes ver los complementos instalados con el siguiente comando. dstat --list ejemplo de salida... sergio@SoloLinux:~> dstat --list internal: aio, cpu, cpu24, disk, disk24, disk24old, epoch, fs, int, int24, io, ipc, load, lock, mem, net, page, page24, proc, raw, socket, swap, swapold, sys, tcp, time, udp, unix, vm /usr/share/dstat: battery, battery-remain, cpufreq, dbus, disk-tps, disk-util, dstat, dstat-cpu, dstat-ctxt, dstat-mem, fan, freespace, gpfs, gpfs-ops, helloworld, innodb-buffer, innodb-io, innodb-ops, lustre, memcache-hits, mysql-io, mysql-keys, mysql5-cmds, mysql5-conn, mysql5-io, mysql5-keys, net-packets, nfs3, nfs3-ops, nfsd3, nfsd3-ops, ntp, postfix, power, proc-count, qmail, rpc, rpcd, sendmail, snooze, squid, test, thermal, top-bio, top-bio-adv, top-childwait, top-cpu, top-cpu-adv, top-cputime, top-cputime-avg, top-int, top-io, top-io-adv, top-latency, top-latency-avg, top-mem, top-oom, utmp, vm-memctl, vmk-hba, vmk-int, vmk-nic, vz-cpu, vz-io, vz-ubc, wifi sergio@SoloLinux:~> Además, las posibilidades de la herramienta dstat se pueden ampliar utilizando complementos, entre los mejores nos encontramos con los siguientes: dstat_app - los procesos que más consumen por aplicación dstat_battery: porcentaje de carga de la batería (requiere ACPI) dstat_cpufreq - frecuencia de la CPU (requiere ACPI) dstat_dbus: el número de conexiones dbus (requiere python-dbus) dstat_freespace - ver el uso del disco por partición dstat_gpfs - IO de lectura / escritura de GPFS dstat_gpfsop - operaciones del sistema de archivos GPFS dstat_nfs3 - operaciones del cliente NFS v3 dstat_nfs3op - trabajos extendidos del cliente de NFS v3 dstat_nfsd3 - las operaciones del servidor NFS v3 dstat_nfsd3op - las operaciones extendidas del servidor NFS v3 dstat_postfix - contadores de las diferentes colas (necesita postfix) dstat_rpc - llamadas de cliente RPC dstat_rpcd - llamadas del servidor RPC dstat_sendmail - contadores de la cola mail (necesita sendmail) dstat_thermal - temperatura de la CPU dstat_utmp - número de sesiones utmp (necesita python-utmp) dstat_wifi: señal de conexión inalámbrica y el ruido (necesita python-wifi)   En Sololinux.es seguimos creciendo gracias a nuestros lectores, puedes colaborar con el simple gesto de compartir nuestros artículos en tu sitio web, blog,  foro o redes sociales.   Read the full article

[learnwithgkr]

If else statement in Java:-

In this tutorial is explain about how to use if else conditions statements with explanation and given example of Java Programming.

If else Statement:-  If statement is conditional branch statement. Its can be used to program execution through two different paths. Ifstatement closed with curlybraces.  The conditions return a Boolean value.

Syntex:-

If(condition){

      // If condition is true then execution this part of program

}else{

// If condition is false then execution this part of program

}

Most Read:- What is looping ? How many types of loop in Java and describe?

Example:-

1.      If condition is true then:-

int a=10;

int b= 6;

if(a>b){

System.out.println(“a is greater then b”);

}else{

System.out.println(“a is smaller then b”);

}

Learn more visit my website

[msexcelvba]

How to use IF Formula

[hugochamberblog]

Programming Basics: Statements & Functions: Crash Course Computer Science #12 Today, Carrie Anne is going to start o... #hugochamber #conditional #controlflowstatements #crashcourse #crashcourse #education #elsestatement #forloop #functions #gracehopper #hankgreen #harvardmark1 #ifstatement #johngreen #libraries #modularizing #programming #programminglanguages #statements #variables #vlogbrothers #whileloop Source: https://hugochamber.org/programming-basics-statements-functions-crash-course-computer-science-12/?feed_id=13231&_unique_id=5f33d6df15beb

[alexminhtran2]

Programming Basics: Statements & Functions: Crash Course Computer Science #12 Today, Carrie Anne is going to start o... #cyrrion #conditional #controlflowstatements #crashcourse #crashcourse #education #elsestatement #forloop #functions #gracehopper #hankgreen #harvardmark1 #ifstatement #johngreen #libraries #modularizing #programming #programminglanguages #statements #variables #vlogbrothers #whileloop https://cyrrion.com/programming-basics-statements-functions-crash-course-computer-science-12/?feed_id=4113&_unique_id=5f26b0cddc5e0

[phungthaihy]

Introduction - Excel Crash Course Part 1 of 7 | Corporate Finance Institute http://ehelpdesk.tk/wp-content/uploads/2020/02/logo-header.png [ad_1] Excel Crash Course for Finance P... #accounting #advancedexcelcourse #algorithmictrading #autosum #cfa #cfi #concatenate #corporatefinanceinstitute #daytrading #eomonth #excel #excel101 #excelcourse #excelcrashcourse #excelforbegginers #excelformulas #excellesson #excelninja #excelshortcuts #filldown #fillright #finance #financefundamentals #financialanalysis #financialmanagement #financialmodeling #financialmodelingexcel #financialtrading #finanicalmodelinginexcel #forex #ifstatements #iferror #index #investing #investmentbanking #learnexcel #match #optionstrading #pastespecial #personalfinance #ribbonshortcuts #stocktrading #sumproduct #technicalanalysis #today #vlookup #xirr #xnpv #year #yearfrac

[finallyimnotafish-blog]

(vía GUGUEL, BASE DE DATOS E IF STATEMENTS. DOS. | Lo que pensamos y no decimos)