Computing Power Reduction?

Zhangrc · 2021-08-15, 05:00

Statistics showed that yesterday only 291 first prime tests and 481 verified tests have been completed yesterday. But back in May and June, on average about 310 first prime tests and 600 verified tests were completed every day.
Meanwhile, I've also seen a significant reduction in GPU TF activity. Only months ago, there were days when thousands of numbers were factored. Yesterday only 129 numbers were factored.
Why could this happen?

axn · 2021-08-15, 08:06

Quote:

Originally Posted by Zhangrc

Statistics showed that yesterday only 291 first prime tests and 481 verified tests have been completed yesterday. But back in May and June, on average about 310 first prime tests and 600 verified tests were completed every day.

Exponent becomes larges, tests take longer. Maybe that's adequate to explain this.

Quote:

Originally Posted by Zhangrc

Meanwhile, I've also seen a significant reduction in GPU TF activity. Only months ago, there were days when thousands of numbers were factored. Yesterday only 129 numbers were factored.
Why could this happen?

Last TF level reached the end of the GIMPS range and might have wrapped around to the next bit level/lowest exponents. That would reduce the thruput a lot. But also, some of the SRBase firepower is being redirected to low exponents in support of the "2k" project.

ET_ · 2021-08-15, 10:17

Also consider that the temperatures are quite high here in Europe, and most GPU owners stop their computers due to the overheating.
And that the 2 central weeks of August are often chosen for vacation.

kriesel · 2021-08-15, 13:36

There are several factors. Here's another. Possibly more university computers are off for the summer in first half of August than in May. Summer session enrollment tends to be lower than in full length semesters September to May. Some computer labs can be turned off to save power / money. That's the American schedule, which may apply elsewhere too, and may affect curtisc's throughput (University of Central Missouri).

Lately it's been hot enough I'm selectively idling some gear.

2021-08-15, 05:00	#1
Zhangrc "University student" May 2021 Beijing, China 3²×29 Posts	Computing Power Reduction? Statistics showed that yesterday only 291 first prime tests and 481 verified tests have been completed yesterday. But back in May and June, on average about 310 first prime tests and 600 verified tests were completed every day. Meanwhile, I've also seen a significant reduction in GPU TF activity. Only months ago, there were days when thousands of numbers were factored. Yesterday only 129 numbers were factored. Why could this happen?

2021-08-15, 10:17	#3
ET_ Banned "Luigi" Aug 2002 Team Italia 3·5·17·19 Posts	Also consider that the temperatures are quite high here in Europe, and most GPU owners stop their computers due to the overheating. And that the 2 central weeks of August are often chosen for vacation. Last fiddled with by ET_ on 2021-08-15 at 10:17

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2021-08-15, 13:36	#4
kriesel "TF79LL86GIMPS96gpu17" Mar 2017 US midwest 3·5·439 Posts	There are several factors. Here's another. Possibly more university computers are off for the summer in first half of August than in May. Summer session enrollment tends to be lower than in full length semesters September to May. Some computer labs can be turned off to save power / money. That's the American schedule, which may apply elsewhere too, and may affect curtisc's throughput (University of Central Missouri). Lately it's been hot enough I'm selectively idling some gear.