Snort mailing list archives
Re: [Fwd: snort-2.6rc1 using a lot of memory]
From: Steven Sturges <steve.sturges () sourcefire com>
Date: Wed, 19 Apr 2006 09:30:05 -0400
Nerijus-- As noted in the RELEASE.NOTES, there was a change in the default pattern matching engine from Wu-Manber to standard Aho-Corasick which is faster but consumes more memory. This effectively replaced an implicit config of config detection: search-method mwm with config detection: search-method ac The Aho-Corasick implementation in snort has a few different memory models, standard, full, banded, sparse, and sparse banded. The sparse and spare-banded ones consume much less memory... To use them, add a snort.conf line, as desired, for example. Wu-Manber is being deprecated in the next release. config detection: search-method ac-sparsebands There is also the lowmem method, which is slow, but uses very little memory. Cheers. -steve
While running a test instance of snort-2.6rc1 (and the same was with 2.6beta) on Linux, noticed that it is very memory hungry. At the moment it's 865Mb in resident size with almost all preprocessors enabled and almost all VRT, community and bleeding rules. Is that normal and we should expect that 2.6 series will demand that much RAM? Of course, with this kind of setup one can expect that snort will consume a bit bigger amount of RAM, but not in such numbers. For example, 2.4.4 running with the same config (as much as it is possible, taking into account the differences between 2.4 and 2.6 series) is 125Mb in resident size. That's nearly 7 times less. If any of the developers are interested in my config -- just tell me. :)
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Current thread:
- Re: [Fwd: snort-2.6rc1 using a lot of memory] Steven Sturges (May 10)
- Re: [Fwd: snort-2.6rc1 using a lot of memory] Nerijus Krukauskas (Apr 20)