script examples monitoring system calls (volume per process) examples of SystemTap scripts monitoring system calls (volume per process) monitoring system calls (volume per process) examples of SystemTap scripts system calls volume (per process), monitoring examples of SystemTap scripts uses systemtap/testsuite/systemtap.examples/process/syscalls_by_p*.stp This section illustrates how to determine which processes are performing the highest volume of system calls. In previous sections, we've described how to monitor the top system calls used by the system over time (). We've also described how to identify which applications use a specific set of "polling suspect" system calls the most (). Monitoring the volume of system calls made by each process provides more data in investigating your system for polling processes and other resource hogs. lists the top 20 processes performing the highest number of system calls. It also lists how many system calls each process performed during the time period. Refer to for a sample output. Collecting data... Type Ctrl-C to exit and display results #SysCalls Process Name 1577 multiload-apple 692 synergyc 408 pcscd 376 mixer_applet2 299 gnome-terminal 293 Xorg 206 scim-panel-gtk 95 gnome-power-man 90 artsd 85 dhcdbd 84 scim-bridge 78 gnome-screensav 66 scim-launcher [...] If you prefer the output to display the process IDs instead of the process names, use the following script instead. As indicated in the output, you need to manually exit the script in order to display the results. You can add a timed expiration to either script by simply adding a timer.s() probe; for example, to instruct the script to expire after 5 seconds, add the following probe to the script: probe timer.s(5) { exit() }