Autarchy of the Private Cave » mtrace https://bogdan.org.ua Tiny bits of bioinformatics, [web-]programming etc Wed, 28 Dec 2022 16:09:04 +0000 en-US hourly 1 https://wordpress.org/?v=3.8.27 Bad memory handling and server stabilityhttps://bogdan.org.ua/2009/07/13/bad-memory-handling-and-server-stability.html https://bogdan.org.ua/2009/07/13/bad-memory-handling-and-server-stability.html#comments Mon, 13 Jul 2009 09:29:27 +0000 http://bogdan.org.ua/?p=813 The two graphs below (clickable) are for CPU and RAM use during a period of a program going wild between 23:17 and 23:41 (24+ minutes of server’s downtime). The program was run non-root, it just consumed all the memory it could. It was killed by kernel, so the server started responding without any interventions – which were hard to perform, because none of the services (including ssh) were responding during downtime.
cpugraph
memgraph

If you happen to be developing a C/C++ program – do use mtrace and valgrind, those are huge helpers against the problems akin to that shown on the graphs.

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