topic Thank you for your response. in Software Archive

Phi Card Power Problem

Oscar_Y_ — Mon, 10 Aug 2015 06:54:40 GMT

I used "micsmc-gui" command to see the Phi Card Status. But I have two questions.

Please to see the picture on the attachment.

1.What's different type between "system %" and "user %" ?

2.Why can't go to 300 Watt when user % up to 100% ?

system % = this is how much

Frances_R_Intel — Mon, 10 Aug 2015 17:55:40 GMT

system % = this is how much of the coprocessor is being used to run the kernel and daemons; the kernel only uses one thread on a single core; so system time is small

user % = this is how much of the coprocessor is being used to run user code (code run in user space); so if you are the only person on the coprocessor, this is the percent of the machine you are using; I'm not sure if system calls by your program count as user time or not - I haven't checked the code - but usually they do.

I didn't see what type of card you have - different cards have different power nominal power levels. If you have a 5110P, it has the lowest power - 225 W. If you do have a 5110P, you might want to read section 5.1 in Intel® Xeon Phi™ Coprocessor: Datasheet. There are a couple of reasons why the power may be low - how much power is being provided and whether the operating frequency has been decreased due to high temperatures. A temperature of 82 wouldn't cause throttling - but that doesn't mean that the coprocessor hasn't cut the operating frequency in order to maintain that temperature.

Thank you for your response.

Oscar_Y_ — Tue, 11 Aug 2015 00:43:31 GMT

Thank you for your response.

Phi Card number is SC7120PEB. And I discover power ascension when high temperatures.

Is this issue relate to memory usage?

The 7120P has a TPD of 300W.

Frances_R_Intel — Tue, 11 Aug 2015 01:39:21 GMT

The 7120P has a TPD of 300W. It is the core usage more than memory usage that affects power usage and temperature. It would be power usage which is driving the temperature rise, not the other way around. If, when you say "I discover power ascension when high temperatures", you mean that the temperature is getting above 82C, you will need to provide additional cooling for the card. Preferably it should be well below 82; around 82 is at the top of the range. If it getting above that, please look at increasing cooling before you proceed. There are a number of threads on finding original and interesting ways to cool your coprocessor if your system cannot provide the required cooling.