Best Process Monitoring Tools

When a piece of software starts up, the operating system serving it creates a program to run the associated program. Some programs run one, while others are written to work continuously in a loop (daemons).

Processes sometimes hang because they are waiting for a resource that has been locked by another process. Programs are not always written to deal with every eventuality and there can be processes still live, while effectively not doing anything.

It is a good idea to look through the list of processes and kill off any that seem to have stalled and remove suspicious processes that you don’t recognize. However, this can be a time-consuming task and it is better to use an automated tool to monitor and manage processes.

Here is our list of the ten best processing monitoring tools:

  1. SolarWinds Server & Application Monitor EDITOR’S CHOICE A tool to monitor the health of servers and the processes that they run in support of applications. It runs on Windows Server. Start a 30-day free trial.
  2. Site24x7 (FREE TRIAL) A cloud-based monitoring service that has a server and application monitoring module. It can monitor multiple servers on many sites and also cloud servers. Access a 30-day free trial.
  3. ManageEngine Applications Manager (FREE TRIAL) A monitor for applications that also tracks the processes that they spawn and checks the health of the host. It runs on Windows Server and Linux. Download a 30-day free trial.
  4. Paessler PRTG (FREE TRIAL) An infrastructure monitor that covers networks, servers, and applications. The tool is able to present live data on processes. It runs on Windows Server. Download a 30-day free trial.
  5. Nagios XI An infrastructure monitor that includes server monitoring and has thousands of extensions available. It runs on Linux and can be run over a VM on top of Windows.
  6. Icinga 2 A fork of Nagios with a very good interface and great data visualizations. It installs on Linux.
  7. Zabbix An attractive user interface fronts this free monitoring system for networks, servers, and applications. It installs on Linux, macOS, and Unix.
  8. Datadog Infrastructure A cloud-based service that monitors networks, servers, and applications. Security addons are also available.
  9. Sysinternals Process Explorer A free process monitor that is straightforward and easy to use.
  10. Sysinternals Process Monitor An alternative to the Process Explorer and available for free from Microsoft.

Native process monitoring utilities

All operating systems include a utility that shows current processes. In Windows, this utility is the Task Manager. To get it, right-click on the Taskbar and select Task Manager from the pop-up menu that appears.

Windows Task Manager Processes view

This utility list all processes in categories. The first category is Apps, which are the processes that the user sees on the screen. Background Processes are listed next. These usually serve the Apps that the user has launched and also include system utilities and ongoing tools, such as antivirus software. The last and longest list is Windows Processes, which are all of the programs that the operating system runs.

For each process, the Task Manager shows CPU usage and a percentage of total processing power. Memory and Disk Space are expressed in megabytes. Network I/O per process is displayed in Mbps and the last two columns in the Task Master window relate to the power usage of each process. All of these metrics are aggregated as a percentage of available resources.

When the user clicks on a process, an End task button at the bottom of the window becomes active.

In Linux, Unix, and macOS, users need to type in ps -aux to see all running processes. The output from this command shows:

  • The user account that launched the process
  • The process ID (PID)
  • CPU and memory usage as a percentage of total available resources
  • Virtual memory usage (VSZ)
  • Resident set size (RSS)
  • Terminal associated with the process (TT)
  • A process status code (STAT)
  • The date and time that the process started
  • The command that launched the process.

The user needs to issue a kill command with the process ID in order to stop one of the processes.

The best process monitoring tools

What should you look for in process monitoring software? 

We reviewed the market for process monitoring systems and analyzed the options based on the following criteria:

  • Monitors for processes running on servers and PCs
  • A monitoring service that can link processes to underlying resources
  • Alerts for resource exhaustion
  • The ability to run a small program on board a device
  • A monitor with a small processing footprint
  • A free tool or a paid system with a free trial for a no-cost assessment period
  • A paid tool for large systems of a free tool for individual devices

We followed the guidelines of these selection criteria when searching for process monitors and we also made sure to look for large systems that are suitable for large businesses and small device-resident monitors for use by small businesses.

These tools don’t just provide a monitoring view, they perform the monitoring task for you.

1. SolarWinds Server & Application Monitor (FREE TRIAL)

SolarWinds server and application monitor

SolarWinds Server & Application Monitor from SolarWinds takes care of all of the supporting services that make an application work, which means the processes on the host. The tool tracks all of the services that deliver the application all the way through to the network connection. This system enables systems administrators to pinpoint the exact cause of problems with application delivery.

Key Features:

  • Monitors on-premises and cloud servers
  • Live CPU activity
  • Application dependency mapping
  • Resource allocation monitoring
  • Alerts for blocked processes

It doesn’t matter where the server is, the Server & Application Monitor can still watch it. The server could be a cloud resource or on a remote site; the monitor will make it seem as though it is on your local network.

SolarWinds SAM Linux Monitoring

Taking a different perspective, the monitor will also keep track of the overall activity of your server. It will show the resource usage of all of the applications running on it. This extends to metrics on CPU, memory, and storage space. This live data on server load is a useful tool for capacity planning and the system includes alerts for when the server is overloaded. The monitor records when the server hits its processing limits and is also able to show which applications are using the most resources.


  • Designed with large and enterprise networks in mind
  • Supports auto-discovery that builds network topology maps and inventory lists in real-time based on devices that enter the network
  • Has some of the best alerting features that balance effectiveness with ease of use
  • Supports both SNMP monitoring as well as packet analysis, giving you more control over monitoring than similar tools
  • Uses drag and drop widgets to customize the look and feel of the dashboard
  • Robust reporting system with pre-configured compliance templates


  • This is a feature-rich enterprise tool, it may take time to fully explore all features and options available

The SolarWinds Server & Application Monitor installs on Windows Server. You can get a 30-day free trial to check out the tool.


SolarWinds Server & Application Monitor is our first choice for process monitoring because it includes server health checks as well as process monitoring. The monitor shows all of the activity on a server and also all of the supporting services for each application. This double perspective makes it very easy to spot which processes are in trouble.

Get a 30-day free trial:

Operating System: Windows Server

2. Site24x7 (FREE TRIAL)

Site24x7 Website monitor dashboard

Site24x7 is a cloud-based infrastructure monitoring service. It is able to monitor any server anywhere, including cloud servers. As a SaaS offering, this tool includes all supporting services and hardware, so you don’t need to worry about monitoring the server processes of your server monitor.

Key Features:

  • SaaS package
  • Monitors applications and services
  • Identifies resource shortages
  • Alerts for performance issues

The server monitoring features of Site24x7 are part of an infrastructure package. This can be used to monitor networks as well as servers. The system is able to monitor Windows and Linux servers and those servers can be located anywhere – they just need an agent installed on them.

The base package of Site24x7 Infrastructure covers up to 10 servers and larger businesses can add on more. The system monitors processes and their resource usage, including CPU, disk space, and memory. In fact, the system watches 60 different server performance metrics.


  • One of the most holistic monitoring tools available, supporting networks, infrastructure, and real user monitoring in a single platform
  • Uses real-time data to discover devices and build charts, network maps, and inventory reports
  • The platform is intuitive, little training is needed to get it fully functional
  • User monitoring can help bridge the gap between technical issues, user behavior, and business metrics
  • Supports a freeware version


  • Is a very detailed platform that will require time to fully learn all of its features and options

As a SaaS system, Site24x7 is charged for by subscription so there are no upfront software or hardware purchase costs to getting started with the server monitor and there are no set-up fees. You can access the service immediately on a 30-day free trial.

Site24x7 Start 30-day FREE Trial

3. ManageEngine Applications Manager (FREE TRIAL)

ManageEngine Applications Manager

ManageEngine Applications Manager monitors server resources as well as application performance. The system watches over key metrics on the host including the CPU, memory, and disk space used by each running process. The dashboard will show each resource of the server and rank running applications by their resource usage.

Key Features:

  • Resource usage rankings
  • Monitors on-premises and cloud servers
  • Applicaiton detection

The ManageEngine service requires an agent to be installed on the monitored agent if it is off-site. This enables the system to monitor cloud servers as well. In all cases, the Applications manager operates a system of alerts. When the performance of one application falls or if one resource gets overloaded, the IT technicians will get notified by email, SMS, or chat app message, so they know to return to the monitor to sort out the problem.


  • Offers on-premise and cloud deployment options, giving companies more choices for install
  • Can highlight interdependencies between applications to map out how performance issues can impact businesses operations
  • Offers log monitoring to track metrics like memory usage, disk IO, and cache status, providing a holistic view into your database health
  • Can automatically detect databases, server hardware, and devices in real-time


  • Can take time to fully explore all features and options available

ManageEngine Applications manager installs on Windows Server or Linux. You can get it on a 30-day free trial.

ManageEngine Applications Manager Download 30-day FREE Trial

4. Paessler PRTG (FREE TRIAL)

Paessler PRTG Probe Health Sensor

Paessler PRTG monitors networks, servers, and applications. The system is a collection of monitors, which are called sensors. There are sensors in the package that specifically relate to CPU, memory, and disk usage on a host and detail the processes that use up the most resources.

Key Features:

  • Choice of on-premises or SaaS deployment
  • Server resource sensor
  • Based on WMI

One sensor that is particularly important if you want to monitor processes on a Windows computer is the Windows Process Sensor. This monitor interacts with Window Management Instrumentation to present details on how all of the processes on the host are running. It details absolute working sets in bytes, private bytes, number of threads, handles, and instances, and CPU usage per process. It also totals up the memory, CPU, and disk usage of all active processes.

There are many other server monitoring sensors in PRTG and also network monitors that link activity to protocols, so it is easy to see which types of applications are creating the most network traffic.


  • Uses a combination of packet sniffing, WMI, and SNMP to report network performance as well as discover new devices
  • Autodiscovery reflects the latest inventory changes almost instantaneously
  • Drag and drop editor makes it easy to build custom views and reports
  • Supports a wide range of alert mediums such as SMS, email, and third-party integrations into platforms like Slack
  • Each sensor is specifically designed to monitor each application, for example, there are prebuilt sensors whose specific purpose is to capture and monitor VoIP activity
  • Supports a freeware version


  • Is a very comprehensive platform with many features and moving parts that require time to learn

Paessler PRTG installs on Windows Server 2008 or later. It is also offered as a SaaS service in the cloud. You can get a 30-day free trial of the onsite software to check out the process monitoring system.

Paessler PRTG Start 30-day FREE Trial

5. Nagios XI

Nagios XI

Nagios XI is an infrastructure monitoring system that covers networks, servers, and applications. This is a paid tool that is based on a free open-source project, called Nagios Core. Both Nagios XI and Nagios Core include comprehensive process monitoring.

Key Features:

  • Proprietary process monitor
  • Device discovery
  • Free plug-ins for extended functionality

The Nagios system is able to access both Windows Server and Linux to create its own process monitoring service. The screens for the process monitor are well laid out and easy to read. The details for each operating system version of the process monitor cover the same attributes shown by the native process monitors.

The monitor alerts staff if there is a process in trouble because it is hanging or has crashed. This alert mechanism means that technicians can assume that everything is working okay unless they are notified by Nagios.


  • Is open-source and completely free, with a paid option for enterprises
  • Supports autodiscovery for easy device management
  • Can monitor devices through an additional agent


  • The user interface is lacking, could be easier to use
  • Network mapping visualizations need improvement
  • Not as comprehensive as some of our top choices
  • Must pay extra for support

The software for Nagios XI installs on RHEL, CentOS, Oracle Linux, Debian, and Ubuntu. Although the code is not available for Windows, it can be run on that operating system over a virtualization system, such as VMWare or Hyper-V.  It can be run on Linux and can be run over a VM on top of Windows. You can get a 30-day free trial of Nagios XI.

6. Icinga 2

Icinga 2

Icinga 2 has evolved from a fork of Nagios Core. Many people prefer the interface of Icinga 2 and as it is free, the service is very popular.

Key Features:

  • Server resource monitor
  • Takes Nagios plug-ins
  • Free to use

The Icinga 2 monitoring system includes similar process monitors to those of Nagios XI. The Nagios system includes thousands of free extensions, called plugins, and these work in Icinga 2 as well. The process monitor checks on resource utilization for each process, such as CPU, memory, and disk. It also totals all resource utilization of the server to see whether it is overloaded. The monitor will send out an alert to IT department staff if resource thresholds get breached.


  • Monitors for all types of resource utilization and supports alerting when conditions are breached
  • Allows developers to integrate the tool into other data ingesting applications, such as a SIEM
  • Is completely free


  • No version for Windows
  • The interface needs to be reworked, could be made easier to navigate menus

The software for Icinga 2 can be installed on RHEL, CentOS, Debian, Ubuntu, Raspbian, openSUSE, and SLES. There is no version for Windows.

7. Zabbix

Zabbix screenshot

Zabbix is an attractive free, open-source system monitor that includes a section for server process monitoring. This tool lists processes and identifies their live usage of memory, disk, CPU, and network I/O. The service will also watch the performance of the server as a whole and alert when problems arise.

Key Features:

  • Free to use
  • Server monitoring
  • Alerts for resource shortages

The software for Zabbix installs on Linux, IBM AIX, FreeBSD, NetBSD, OpenBSD, HP-UX, macOS, and Solaris. There is no version for Windows but the system can monitor Windows servers with the installation of an agent on those hosts.


  • Open-source transparent tool
  • Uses both SNMP and IPMP for a broader monitoring range
  • Can detect new devices and configuration changes immediately
  • Offers useful templates for quick insights
  • Robust notification system supports SMS, email, custom script, and webhook


  • The interface isn’t as intuitive as solutions such as DataDog or Site24x7
  • Would like to see better-alerting features, specifically related to reducing false positives

8. Datadog Infrastructure

Datadog screenshot

Datadog infrastructure is a network and server monitoring service that is based in the cloud. The server monitoring element of this SaaS package includes process monitoring with attention to the use of resources of the host.

Key Features:

  • SaaS package
  • Process activity graphs
  • Root cause analysis

The infrastructure monitor aims to expose the underlying causes of performance problems. It identifies the resources used by each application. So, if a database is running slowly, it is possible to trace its processes and see whether any of them are hanging in contention for resources or have just fallen over.


  • Has one of the most intuitive interfaces among other network monitoring tools
  • Cloud-based SaaS product allows monitoring with no server deployments or onboarding costs
  • Can monitor both internally and externally giving network admins a holistic view of network performance and accessibility
  • Supports auto-discovery that builds network topology maps on the fly
  • Changes made to the network are reflected in near real-time
  • Allows businesses to scale their monitoring efforts reliably through flexible pricing options


  • Would like to see a longer trial period for testing

The monitoring system is able to watch over any server anywhere. The server will need to have an agent installed on it. Datadog Infrastructure is charged for by subscription and it is available for a 14-day free trial.

9. Sysinternals Process Explorer

Sysinternals Process Explorer

Sysinternals is a group of system monitoring and management tools available for Windows computers. All of these utilities are free to use. Sysinternals is owned by Microsoft and all of the programs can be downloaded from the Microsoft site. Once a tool has been installed, it can be launched from Windows Explorer.

Key Features:

  • Free tool
  • Live process details
  • Produced by Microsoft for Windows

The Process Explorer is the first of two process monitoring and management tools in the Sysinternals range.  The interface for the utility has two panels. The top panel lists all active processes and is subdivided into a tree hierarchy menu and a list of process attributes. The lower panel shows details of a selected process, including its launching program and any files or resources that it is using.

A second screen for this utility shows a performance graph for the host as a whole detailing CPU, memory, and I/O activity over time.


  • Designed specifically for technicians and sysadmins
  • Provides a detailed breakdown of processes, services, and their correlation with resource consumption
  • Can quickly kill processes or explore the process tree of any given application
  • Pairs well with Sysinternals Process Monitor for long-term monitoring


  • Does not offer multi-device management, more of a diagnostic tool

10. Sysinternals Process Monitor

Sysinternals Process Monitor

The second Sysinternals utility for processes is called Process Monitor. This facility is free to use and downloads from the Microsoft site. This tool enables all processes to be shown or a selection based on a search filter.

Key Features:

  • Free tool
  • Searchable process list
  • Produced by Microsoft for Windows

Details of each process include any registry-related activity and file usage. The monitor is constantly active and shows live data. It links related processes together in a parent-child hierarchy, so it is possible to identify processes that create a lot of activity on the host even though the observations of each individual process might seem slight.

Although the two free Sysinternals tools are less comprehensive than the third-party tools on this list, they cost nothing to download and take up very little space, so they would be useful to have in addition to a more comprehensive full system monitoring tool.


  • Uses very few system resources
  • Can easily organize processes based on their parent, allowing you to identify the root cause of issues faster
  • Can be used to identify malware and run long term monitoring on a single machine
  • Designed specifically for technicians and sysadmins


  • Does not offer multi-device management, is more suited for scanning individual machines

Choosing a process monitoring tool

Although the native process monitors are free and don’t need to be installed, they don’t offer much insight and they can be difficult to read. There are a number of very good process monitors available on the market. These have graphical interfaces that interpret process statistics meaningfully and they are also able to examine processes running on devices across the network or even on a different site.

Businesses that run many servers will particularly benefit from a good quality process monitoring tool. These services are able to aggregate the performance of all devices as an overview and they usually include an alert mechanism that will draw the attention of technicians when one process seems to be overloading the system.

Process monitoring FAQs

Why is process monitoring important?

Process monitoring enables technicians to see when server resources are running short and then identify the process or processes that are using the most resources. CPU capacity usage, memorat availability, and disk interactions are the three most important factors to watch.

How do you monitor process performance?

Effective process performance monitoring can only be achieved through a GUI tool – the task is too complex to be performed by a command line tool. You need to be able to see the resource usage of each individual process and also the cumulative demand of all active processes on server resources. Resource shortage is a major cause of application performance impairment.

What are the three main purpose of monitoring?

It is important to monitor processes for three reasons:

  1. To identify resource utilization and plan server capacity.
  2. To spot resource locks and hanging processes so you can make a manual intervention to remove obstacles to smooth operations.
  3. To work out which services or applications use the most resources in order to assess the cost and viability of software purchases.