BIND9 and libpthread performance

[Julian Elischer]

Pawel Worach wrote:
> Hi,
> 
> I did some simple benchmarking with libpthread vs. libc_r and BIND.
> The numbers puzzle me. Are pthreads supposed to this much slower?
> 
> Tests done using BIND9 with a authoritative root zone. The queryperf
> tool from bind-9.3.0/contrib/queryperf was used to get the numbers.
> Queries where done for ". SOA". (queryperf -s 127.0.0.1 -l 30)
> 
> This is on -CURRENT from Oct 6th, WITNESS, INVARIANTS off and
> libpthread built without _LOCK_DEBUG and _PTHREADS_INVARIANTS.
> Hardware is a dual IBM x345 2.8ghz Xeon box with HTT on. SCHED_4BSD,
> PREEMPTION and ADAPTIVE_GIANT are in the kernel config, malloc.conf
> symlinked to 'aj'.
> 
> Results (queries per second according to queryperf):
> x libpthread-system-scope
> + libc_r
> +--------------------------------------------------------------------------+ 
> 
> |x                                                           +++        
> + +|
> |A                                                          
> |__M__A______| |
> +--------------------------------------------------------------------------+ 
> 
>     N           Min           Max        Median           Avg        Stddev
> x   5     2074.3131     2094.7966     2087.3796     2086.4217      7.579802
> +   5     8179.1707     9535.1741     8448.1802     8763.1869     619.70126
> Difference at 95.0% confidence
>         6676.77 +/- 639.13
>         320.01% +/- 30.6328%
>         (Student's t, pooled s = 438.228)
> 
> Any ideas why the difference is so big, is there anything else to tune?

try libthr (use libmap.conf) and why are you using scope_system?

>