[Pkg-openldap-devel] Bug#421946: openldap2.3: build against newer Berkeley DB

[Howard Chu]

Clint Adams wrote:
> On Mon, Oct 08, 2007 at 09:00:17PM -0700, Howard Chu wrote:
>> I've just rerun my tests using both BDB 4.2.52 and 4.6.21 and the
>> behavior is as expected. On an otherwise idle machine, both perform well,
>> completing our concurrency test in about 31 seconds.
>>
>> With a CPU-hog running in the background, the test with BDB 4.2.52 takes
>> only 37 seconds, while BDB 4.6.21 takes 1:42. Watching with top you can
>> see that BDB 4.6.21 gets a lot less CPU than BDB 4.2.52. This is the
>> problem with using yield() on an NPTL system - whereas on most POSIX
>> systems yield() only yields control to some other thread in the current
>> process, on NPTL yield() gives up the CPU for the entire process.
>
> Were these run with or without a ShmKey / DB_SYSTEM_MEM ?
>
Both with and without DB_SYSTEM_MEM; that's really irrelevant to the poor 
locking behavior.

-- 
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/