Another lesson from this case.
When a machine starts using virtual memory, its performance drops substantially. If you've got a server whose throughput needs to stay high to keep up with demand, this is a disaster. But, worse yet, once things start swapping, it is really hard to recover.
By contrast if that machine had no virtual memory, the failures are much more obvious. Plus there is a good chance that the offending memory hog will die fast, and the server is likely to be able to continue doing everything else it is supposed to do.
Therefore if you have an expensive server, think about getting extra RAM and disabling swap. Or even just disabling swap.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||