This feature requires strace to be installed too. In the same idea than the file trace, htop allows you to trace all system call made and signals received by a process. Simply select the process and use the shortcut l. If lsof is installed, you even don’t need to switch from one utility to another anymore. In addition the nich thing is that you can select the signal you want to send to the process.ĭuring your analysis if you have identified some processes using htop, you may want to check the files accessed by them. Instead entering a PID, now you just need to tag the process(es) you want to kill. The kill function has been made much more handy. You untag a process by pressing the space bar again or easily untag all processes using the shortcut U (shift + u) Using the space bar, you will be able to tag processes and then run an action on all of them.
If you need to run the same action such kill or renice on several processes, htop offers the Tag function for this purpose. Then processes having child processes can be expended using the + or – key, which allows also to collapse the tree. The Tree View can be activated using F5 or the t shortcut. This should ease the switch for top users to htop.īeside these “cosmetic” enhancement, the coolest features in htop are: This means that if now F9 is designed to kill a process the shortcut k is still available. This seems to be trivial but is quite useful while starting to use the tool or for people not using it often.Īs htop is based on the same principle than top, it also integrates almost the same shortcuts. Then an other good idea in the tool is that unlike top the main functions are displayed at the bottom. In addition this part can be fully customized through the Setup (F2 or shift + s) It provides a pretty good overview using colors, which is close from the principle used in nmon and really easy and fast to read. The first point I found nice once I started htop was the visual representation of the server load. In my examples below, I have started htop by filtering on the oracle user to get an eye on my databases processes. Note that if you want to be able to display the files used by a process within htop, then lsof must be installed too. However if like me you do not have it in a repo, you can easily find the binaries and sources on the project web site įor my tests, I installed it on Oracle Enterprise Linux 5.7 using the RHEL binaries Htop is available on most of the Linux distribution and even already included in several repositories such the canonical or the EPEL one. Pretty good visual representation of CPU, Memory and Swap usage.Actions on multiple processes through tagging using the space bar.Kill or renice processes (already in top).
Htop is an interactive process viewer developed by Hisham Muhammad. To get started with performance checks and analysis, a interesting utility is available: htop What is htop However trying to dig in processes analysis and looking for files and processes relations may be quite painful. In order to analyse such cases several tools and utilities, like top, nmon, fuser or lsof are available under Linux. I’m pretty sure that most of you already struggled with some low performance systems.
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