On Oracle Solaris platforms, you can collect data from a running process using the Collector. If the process is already under the control of dbx, you can pause the process and enable data collection using the methods described in previous sections. Starting data collection on a running multithreaded process is not supported on Linux platforms.
If the process is not under the control of dbx, the collect –P pid command can be used to collect data from a running process, as described in Collecting Data From a Running Process Using the collect Utility. You can also attach dbx to it, collect performance data, and then detach from the process, leaving it to continue. If you want to collect performance data for selected descendant processes, you must attach dbx to each process.