Liam, I'd look at this from a more generic POV (that's all I can do ATM, I'm afraid):
In order for a debug kernel to be useful, it has to record (you guessed it) debug information (in addition to what the kernel records without debug - obviously). This additional recording effort will consume space and CPU cycles. How much is consumed depends on what you're doing and what kind of debug information is recorded. The impact will depend on how much you're doing - if your system is only lightly loaded, the additional load may go unnoticed. So, to get the answer for your specific circumstances, I'd first run your usual job(s)/workloads/whatever using the debug kernel, and record the times various tasks consume. Then repeat the exercise with a non-debug kernel, and compare times. This will give you an idea about *your* situation. HTH Michael On Thu, Jul 10, 2014 at 7:05 AM, Liam Slusser <[email protected]> wrote: > Scott - > > Oh wow, thank you so much for the reply. I'll run on the debug kernel for > a few days to make sure it is stable and then rebuild with no debug. > > thanks, > liam > > > > On Wed, Jul 9, 2014 at 9:59 PM, Scott McClung <[email protected]> wrote: > >> * Liam Slusser ([email protected]) [140709 05:55]: >> > Does running a debug kernel cause a performance impact? Basically I >> build >> > a nightly image with debugging enabled (defaults) and all seems to work >> > great but I'm wondering if there is a performance penalty and I should >> > rebuild without debugging? >> >> I am not an OI developer, but I had reason to build my own >> illumos-gate a few months ago for testing a patch I thought might help >> my particular workload. I found that the debug build was much slower, >> on the order of 1/5th the I/O performance of a non-debug build for our >> iozone benchmarks. >> >> -- >> Scott McClung ([email protected]) >> >> _______________________________________________ >> oi-dev mailing list >> [email protected] >> http://openindiana.org/mailman/listinfo/oi-dev >> > > > _______________________________________________ > oi-dev mailing list > [email protected] > http://openindiana.org/mailman/listinfo/oi-dev > -- Michael Schuster http://recursiveramblings.wordpress.com/
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