Archives Discussions

[afo]

Getting back data from stream is about 80x slower than sending...

Dear people,

I am using SDK1.4 with Brook+ to do integer matrix operations. In my application I see that using stream.write is 80x slower than using stream.read for the same amount of data. Is that normal? Is there something that I can do to have the same performance in both operations? Thanks in advance for any insight to this.

best regards,

Alfonso

[gaurav_garg]

I am not sure if you have measured the performance correctly. streamRead is an asynchronous operation whereas streamWrite is blocking and it also include wait for any other operations on stream (read or kernel call).

You should time it like this-

stream.finish();

//timer_start();

// operation on stream - stream.read() or strream.write()

stream.finish();

// timer_stop();

[afo]

Thanks for the info. I corrected the code that measures time.

best regards,

Alfonso