[syslog-ng] log failback groups

Balazs Scheidler bazsi at balabit.hu
Mon Mar 22 19:56:52 CET 2010

On Mon, 2010-03-22 at 12:54 -0500, Martin Holste wrote:
> That's definitely some heavy-duty regex.  You'd be a good candidate
> for the pattern db, as the pattern matching engine is orders of
> magnitude faster than PCRE because it uses trie-based pattern
> searching.  It also allows for extracting the matches and using them
> in the output macros, so you wouldn't have to sacrifice any
> functionality.  I would estimate that it would drop your CPU usage
> down to around 25-30% while doing all of the work in a single thread.
> @Balabit: You know what goes great with pattern matching?  CUDA
> support with Nvidia cards for GPU-based pattern matching acceleration.
> They've got preliminary support for it in the Open Information
> Security Foundation's (OISF) Suricata IDS engine.  That project is
> GPL, so you could port most of that code directly into the pattern db
> matcher for the OSE version of SyslogNG.  $500 USD will buy a GPU with
> 480 stream processors, so you could match 480 patterns simultaneously,
> per card.  You can link up to four cards together, so you could match
> 1920 patterns in parallel, offloaded from the CPU, on commodity
> hardware.  So, a server costing under $5,000 could probably process
> (maybe not store) 250,000+ messages per second.  Even if there wasn't
> much speed increase, the CPU offload alone would probably be worth it
> for busy log servers.

Thanks for the hint, I've downloaded the docs, I'll definitely look into


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