From: Nicolas Morey-Chaisemartin <devel@morey-chaisemartin.com>
Date: Thu, 18 Dec 2008 21:16:57 GMT
Subject: Re: [RFC PATCH 0/2] Add support for multi threaded checkout
Message-ID: <494ABDC9.9060001@morey-chaisemartin.com>
In-Reply-To: <3BA20DF9B35F384F8B7395B001EC3FB3265B2A01@azsmsx507.amr.corp.intel.com>

Pickens, James E a écrit :
> Even in that case it will have *some* impact
> from locking/unlocking the mutex, but I think it would be in the noise.
>
> James
> -
I guess you could do something like :

#define checkout_lock()		core_threaded_checkout ?pthread_mutex_lock(&checkout_mutex) : (void) 0
#define checkout_unlock()		core_threaded_checkout ?pthread_mutex_unlock(&checkout_mutex) : (void) 0

It should be faster when you don't actually use threaded checkouts, as you won't unnecessarily lock/unlock your mutex. 

Have you looked at the perf from local to local? I'm just curious.

Nicolas Morey-Chaisemartin