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Use atop when you need both a live view of a Linux VPS and evidence you can replay after a spike. It samples CPU, memory, swap, disks, network interfaces, and processes in a terminal. Start with the system summary, then sort or filter the process list to find the workload responsible. Enable raw logging as well: atop -r can replay a recorded interval after an intermittent incident has ended.

The commands below cover package installation, interactive monitoring, historical logs, process attribution, permissions, and the limits of what atop can show on a VPS.

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What atop monitors on a Linux VPS

Atoptool describes atop as “an ASCII full-screen performance monitor for Linux that is capable of reporting the activity of all processes.” Its interface combines a host-level summary with the processes contributing to the current load, rather than showing only one metric such as CPU percentage.

Area What you can examine Important qualification
CPU System-wide CPU use and the processes consuming CPU time Compare successive samples to distinguish a brief burst from sustained work.
Memory and swap Host memory pressure, swap activity, and process memory fields A single screen does not establish a leak; repeated samples or a replayed log are more useful.
Disks System disk activity and, where supported, per-process disk transfers Per-process disk transfer accounting requires root privileges and kernel storage-accounting support in the Debian documentation.
Network Traffic and activity for network interfaces Per-process network attribution needs the optional netatop module and daemon; interface-level totals work without it.
Processes Commands, resource fields, and changing activity over time Unchanged processes are suppressed by default, so switch to the documented activity/all-process view when a quiet process matters.

Atop is principally a terminal monitor and raw-log reader. Its documentation does not provide a web dashboard, alert routing, or fleet-management layer; those functions require complementary tooling.

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Install atop

Use your distribution package

Install the package supplied by your Linux distribution whenever one is available. On Debian or Ubuntu, the usual package workflow is:

sudo apt update
sudo apt install atop

The package normally installs the command, its service configuration, and a background logger. Package names, service behavior, and default paths can differ on other distributions, so inspect the installed service and configuration rather than assuming Debian’s settings apply everywhere.

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Build from upstream source

If your distribution does not provide a suitable package, build the upstream source. The upstream installation instructions list zlib, ncurses, and the glib runtime among the required dependencies. After installing development headers and a compiler through your distribution, build the program and choose the installation target that matches the init system:

make
sudo make install

Use the SysV-init target instead on a SysV system:

make
sudo make sysvinstall

Check the resulting command before troubleshooting a service:

atop -h

The help output is also the authoritative list of options and interactive commands for the version you installed.

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Start a live monitoring session

  1. Launch the monitor. Run atop from an SSH terminal. The documented interactive default is one sample every 10 seconds.
  2. Change the cadence or duration when needed. Pass an interval and, optionally, a sample count. For example, atop 5 12 requests 5-second samples for 12 displays on versions that accept the standard interval/count syntax. A shorter interval catches fast bursts but produces more screen updates; a longer interval is easier to read during steady observation.
  3. Read the host summary first. Establish whether the pressure is CPU, memory or swap, disk, or a network interface before blaming a process.
  4. Inspect the process section. Identify commands whose resource use changes with the host symptom. Atop normally hides processes whose counters have not changed since the previous sample.
  5. Expose quiet or unchanged processes when necessary. Press h to display the interactive command summary, then select the documented activity/all-process control. This is important when a sleeping service, a process that wakes only periodically, or a process that has just exited is relevant to the investigation.
  6. Use the resource-specific view or sort control. The Debian manual documents controls for CPU, memory, and disk sorting and describes the per-process fields. Use the help screen for the exact key labels in your build, because interactive keys can vary by version.

Leave the session running for several samples before drawing a conclusion. A process at the top of one screen may be a short-lived burst, while a process that remains high across samples is a stronger candidate for the underlying load.

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Read each part of the display

CPU pressure

Start by determining whether the host is spending time on user work, kernel work, or waiting for I/O. Then sort or switch to the CPU-focused process view. Look for a command that stays active across successive samples, and inspect its command line so that similarly named workers are not confused. Record the elapsed behavior: a continuously busy process suggests sustained computation, whereas isolated peaks suggest a scheduled job, request burst, or short-lived child process.

Memory and swap pressure

Check available memory and swap activity in the host summary before examining individual processes. A process with a large resident footprint is not automatically the cause of system-wide pressure; several moderate processes can exhaust a small VPS together. Use the memory-focused process fields and compare the same commands over repeated samples. A steadily increasing footprint is more significant than one large but stable allocation.

Disk wait and saturation

When CPU time appears low but requests are slow, inspect system disk activity and wait behavior. If the required accounting support and privileges are present, sort by per-process disk transfers to find readers or writers. Without that support, use the system-level disk counters to establish that storage is the bottleneck, then correlate the interval with application logs or scheduled jobs.

Network load

Begin with the interface-level counters. They show whether the VPS is receiving or transmitting traffic and which interface is busy. Atop cannot attribute that traffic to individual processes unless the optional netatop module and daemon are installed and operating. If those components are absent, do not interpret an interface total as proof that a particular process generated it.

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Find which process caused a spike

Use a repeatable sequence instead of relying on the process at the top of a single screen:

  1. Note the time and symptom: CPU saturation, swap growth, disk wait, or an interface spike.
  2. Confirm the corresponding host-level counter in atop.
  3. Open the matching resource view or sort order from the interactive help.
  4. Switch to the activity/all-process display if the suspected command is not visible because it was unchanged at the last sample.
  5. Follow the leading commands through several samples. Compare their resource fields, command lines, and elapsed behavior.
  6. Correlate the interval with the service’s own logs, job scheduler, deployment record, or request metrics before stopping anything.

This process separates cause from consequence. For example, high CPU may be caused by an application worker, while a backup process may be the cause of disk wait and a database may merely be delayed by it. Atop supplies the system and process counters; service logs explain what the command was doing.

Keep historical evidence with raw logs

Write a raw logfile yourself

For a controlled capture, write atop’s raw counters to a file:

atop -w rawfile

The raw file is intended for later replay, not for casual text viewing. Keep it on storage with enough free space and choose a retention policy appropriate to the VPS.

Replay a capture

Read a raw file with:

atop -r rawfile

Replay lets you move through the recorded samples after the incident. It is particularly useful for a spike that ended before anyone could connect.

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Use the packaged daily logger

Distribution packages commonly run a background logger. Debian’s current atop documentation describes these defaults:

Setting Debian documented default Meaning
LOGINTERVAL 600 seconds One raw sample every 10 minutes.
LOGGENERATIONS 28 Twenty-eight logfile generations are retained.
Filename /var/log/atop/atop_YYYYMMDD Daily files named with the calendar date.
Format Compressed raw system and process data Replay with atop rather than opening the file as ordinary text.

These are Debian package defaults, not universal atop behavior. Check /etc/default/atop and the installed service configuration on another distribution. A 10-minute logging interval can miss a short event; reduce the interval when brief incidents matter, while accounting for the added storage.

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Read today’s log and narrow the time window

Debian examples use atop -r to read the current day’s logfile. To investigate a particular period, supply beginning and ending times with -b and -e; for example:

atop -r -b 14:00 -e 15:00

Accepted time formats and date-selection behavior are version-specific, so confirm them with atop -h or the installed manual. When you need data for scripts or a report rather than the full-screen interface, use the parsable-output option -P together with the metric selections documented by your version.

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Permissions and optional kernel support

Per-process disk accounting

The Debian manual requires root privileges for per-process disk transfer data and notes that the kernel must provide the relevant storage-accounting support. If those counters are blank or unavailable, first verify that atop is running with the required privileges and that the kernel configuration supports the accounting method. System-wide disk activity can still be useful without per-process attribution.

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Per-process network accounting

Install and enable the optional netatop module and daemon when you need to map network load to processes. Without them, atop reports network-interface activity only. Treat the absence of process-level network fields as a capability limitation, not as evidence that no process is using the network.

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Incident playbooks

A CPU spike

  • Confirm host CPU saturation.
  • Choose the CPU-focused sort or view.
  • Track the leading command across multiple samples.
  • Capture its full command line and correlate the start time with jobs, deployments, or requests.

Memory growth or swapping

  • Check host memory and swap counters.
  • Use memory fields to rank processes.
  • Compare repeated samples to distinguish growth from a stable large allocation.
  • Replay the daily raw log if the growth occurred before you connected.

Disk wait

  • Verify system disk activity and wait behavior.
  • Use per-process disk fields only when accounting and privileges are available.
  • Correlate the interval with backups, compaction, database maintenance, or other scheduled work.

Network saturation

  • Identify the busy interface and direction of traffic.
  • Use process attribution only with netatop support.
  • Without it, combine atop’s interface timeline with application or firewall logs.

An intermittent event

  • Ensure the packaged logger is enabled before the next occurrence.
  • Check the actual interval and retention settings rather than assuming Debian defaults.
  • Replay the relevant daily file with atop -r, constrain it with -b/-e, and use -P when extracting selected metrics.

Operational cautions and limits

Do not abruptly terminate atop with kill -9. The manpage warns that this prevents atop from stopping process accounting cleanly and can allow the accounting file to grow excessively. Exit through the program’s normal quit command or stop its service through the init system.

Raw logs are valuable incident evidence, but they consume storage. Set retention deliberately, monitor the log directory, and verify that rotation is actually occurring. A logger that is enabled but writing to an unexpectedly small or full filesystem is not a reliable recovery plan.

Atop gives a compact, process-aware terminal view and replayable counters. It does not by itself provide alert delivery, a browser dashboard, centralized fleet management, or long-term time-series analysis. If those are requirements, retain atop for host-level incident investigation and add a separate monitoring system for dashboards and alerts.

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