threadsafe but single threaded

[Erling D. Andersen]

Hi

After reading

https://github.com/flame/blis/wiki/Multithreading

I realize I need

./configure --enable-threading=pthreads ......

to make Blis threadsafe.

However, since I thread myself then I do want Blis to run single threaded independent of the setting of

export BLIS_NUM_THREADS=8

Will the setting

bli_thread_set_num_threads( 1 );

after bli_init achieve this?

[Field G. Van Zee]

Erling,

Sorry for the delayed response. I don't know how this message fell
through the cracks, but it did. Apologies.

Yes, using bli_thread_set_num_threads() to set the number of threads to
1 (after bli_init(), of course) should have the desired effect of BLIS
running single-threaded but also thread-safe.

One caveat: Please make sure that bli_init()/bli_finalize() are outside
of your application's threaded region. I don't recall if these functions
are also thread-safe.

Let us know if you have any other questions.

Field

[Jeff Hammond]

On Wed, Sep 6, 2017 at 12:18 PM, Field G. Van Zee <fi...@cs.utexas.edu> wrote:

Erling,

Sorry for the delayed response. I don't know how this message fell through the cracks, but it did. Apologies.

Yes, using bli_thread_set_num_threads() to set the number of threads to 1 (after bli_init(), of course) should have the desired effect of BLIS running single-threaded but also thread-safe.

One caveat: Please make sure that bli_init()/bli_finalize() are outside of your application's threaded region. I don't recall if these functions are also thread-safe.

If they aren't, it's a simple matter of pthread_once to fix it...

Jeff

 

Let us know if you have any other questions.

Field

On 08/21/2017 02:55 AM, Erling D. Andersen wrote:

Hi

After reading

    https://github.com/flame/blis/wiki/Multithreading

I realize I need

    ./configure --enable-threading=pthreads ......

to make Blis threadsafe.

However, since I thread myself then I do want Blis to run single threaded independent of the setting of

    export BLIS_NUM_THREADS=8

Will the setting

    bli_thread_set_num_threads( 1 );

after bli_init achieve this?
 

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[Erling D. Andersen]

Thanks for the update.