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Message-ID: <3BA2C7F3.9010004@cnet.com>
Date: Fri, 14 Sep 2001 20:16:03 -0700
From: Ian Holsman <ianh@cnet.com>
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To: Ian Holsman <ianh@cnet.com>
CC: Aaron Bannert <aaron@clove.org>, dev@apr.apache.org
Subject: Re: [proposal] apr_thread_setconcurrency()
References: <20010914154448.V11014@clove.org> <3BA2BD23.8060004@cnet.com>
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Ian Holsman wrote:

> Aaron Bannert wrote:
> 
>> I'd like to propose we add a call that gives a hint to the OS as to
>> the level of concurrency we wish to have. This would mirror
>> pthread_setconcurrency(), and would be a simple call to that on
>> operating systems that have it available. On other platforms it
>> would be simple noop.
>>
>> Give me some +1s and I'll submit a patch.
>>
>> -aaron
>>
> 
> +1 IF the number you set it to is a hint, and solaris can changes the
> concurrency afterwards according to the load on the system/internal
> guidelines.
> 
> Oh...
> I ran the the testlockperf code on the 8-way box, with
> the pthread_setconcurrency calls commented out, and with
> the concurrency calls put in (setting them to 8).
> results are as follows
> 
> (without setconcurrency)
> APR Lock Performance Test
> ==============
> 
> apr_lock(INTRAPROCESS, MUTEX) Lock Tests
>     Initializing the apr_lock_t                             OK
>     Starting all the threads                                OK
> microseconds: 9373710 usec
> apr_thread_mutex_t Tests
>     Initializing the apr_thread_mutex_t                     OK
>     Starting all the threads                                OK
> microseconds: 7304314 usec
> apr_lock(INTRAPROCESS, READWRITE) Lock Tests
>     Initializing the apr_lock_t                             OK
> microseconds: 11247506 usec
> apr_thread_mutex_t Tests
>     Initializing the apr_thread_mutex_t                     OK
> 
> microseconds: 8148914 usec
> 
> (with pthread_setconcurrency(8) where you put the comments)
> APR Lock Performance Test
> ==============
> 
> apr_lock(INTRAPROCESS, MUTEX) Lock Tests
>     Initializing the apr_lock_t                             OK
>     Starting all the threads                                OK
> microseconds: 20054346 usec
> apr_thread_mutex_t Tests
>     Initializing the apr_thread_mutex_t                     OK
>     Starting all the threads                                OK
> microseconds: 16979410 usec
> apr_lock(INTRAPROCESS, READWRITE) Lock Tests
>     Initializing the apr_lock_t                             OK
> 

microseconds: 247538114 usec
apr_thread_mutex_t Tests
     Initializing the apr_thread_mutex_t                     OK
microseconds: 250328270 usec

(I didn't wait long enough)


> --It just sits at this point....
> (CVS Code is a couple of day old if that makes a difference)