If you're running Kernel 4.14+ you can get more advanced Linux memory usage metrics like Proportional Set Size (PSS), Unique Set Size (USS), proportional swap usage and others (see the documentation for what you can get from /proc/]įor me, it was important to have structured output so that I could more easily consume it for analysis. Procpath can also visualise RSS of the target process into an SVG out of the box like this: $ procpath plot -d tgt.sqlite -f tgt.svg -q rss -p $PID Using a SQLite GUI can be a more convenient to explore and query the database (e.g. $ sqlite3 tgt.sqlite "SELECT ts, stat_rss * 4 rss_kib FROM record WHERE stat_pid = $PID" When you think it has recorded enough datapoints, Ctrl+C it and this will give you the recordings. A really good tool is pmap which list the current usage of memory for a certain process: pmap -d PID For more information about it see the man page man pmap and also have a look at 20 Linux System Monitoring Tools Every SysAdmin Should Know, which list great tools I always use to get information about my Linux box. By default it makes a recording per 10 seconds (for the target process, its ancestors and descendants). When we create a big xml file from a DB a curve goes. That means it shows memory curve which corresponds to reality. In the simplest case you point it to the PID of interest and let it record its Procfs metrics including Resident Set Size (RSS). System.gc () Runtime rt Runtime.getRuntime () long usedMB (rt.totalMemory () - rt.freeMemory ()) / 1024 / 1024 rmation (this, 'memory usage' + usedMB) This code works fine. Yes, can achieve exactly this, a bit more with Procpath (author here). We'll also look at reading /proc/meminfo directly. In this roundup, we'll cover the most commonly used command-line methods: free, vmstat, and top. I want to monitor memory usage of a process, and I want this data to be logged. Reading /proc/meminfo There are plenty of ways you can get the lowdown on memory usage within your Linux system.
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