Wednesday, September 16, 2009

Prime Brokerage Risk technology IV (30H

Q: How do you see memory usage by a given unix process?

* I said “ps”. Indeed Linux ps command reports memory usage. See http://linux.die.net/man/1/ps.
** Sometimes ps -ef doesn't show it, but ps aux does.

* I said “/proc has process id directories. In each directory there are many details about that process, including memory”. This is supported on linux. See http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/ref-guide/s1-proc-directories.html

AA: ps # SZ = virt mem used; RSS = real mem used
AA: use top. http://www.unixtop.org/man.shtml says

M      Sort display by memory usage.  Shorthand for "o size".


Q: when do you use static
A: I said “I don’t use static unless …”. In most OO designs, there are far more non-static than static members. Encapsulation, inheritance and polymorphism need non-static.

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http://www.linkedin.com/in/tanbin