Bitcoin Forum
December 08, 2016, 12:11:03 AM *
News: To be able to use the next phase of the beta forum software, please ensure that your email address is correct/functional.
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Big fluctuations in total network hashing power  (Read 1739 times)
malevolent
can into space
Staff
Legendary
*
Offline Offline

Activity: 1624



View Profile
January 21, 2012, 11:27:24 PM
 #1

How is it possible that there are changes of total network hashing by 20-50% in 24-48h?

From what I read this can happen for a day or two after a difficulty change but from what I see it also happens before (now).
Or is there a problem with network monitors (bitcoin.sipa.be and others)
1481155863
Hero Member
*
Offline Offline

Posts: 1481155863

View Profile Personal Message (Offline)

Ignore
1481155863
Reply with quote  #2

1481155863
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Costia
Newbie
*
Offline Offline

Activity: 28



View Profile
January 21, 2012, 11:50:43 PM
 #2

maybe some people are testing their new Ghash/s FPGAs or pools being DDoSed
kjj
Legendary
*
Offline Offline

Activity: 1302



View Profile
January 22, 2012, 02:07:52 AM
 #3

There are no measurements of the network speed, just estimates.  The estimates are very noisy, particularly on short time frames.

p2pcoin: a USB/CD/PXE p2pool miner - 1N8ZXx2cuMzqBYSK72X4DAy1UdDbZQNPLf - todo
I routinely ignore posters with paid advertising in their sigs.  You should too.
BinaryMage
Hero Member
*****
Offline Offline

Activity: 546


Ad astra.


View Profile
January 22, 2012, 11:25:13 PM
 #4

maybe some people are testing their new Ghash/s FPGAs or pools being DDoSed

ABCPool was DDOS'd a few days ago, that probably had a small effect. Mostly it's just fluctuation though - network hashrate estimates are based on the number of blocks found in a certain time period, which varies based on luck. (or pseudo-luck)

-- BinaryMage -- | OTC | PGP
malevolent
can into space
Staff
Legendary
*
Offline Offline

Activity: 1624



View Profile
January 22, 2012, 11:59:45 PM
 #5

maybe some people are testing their new Ghash/s FPGAs or pools being DDoSed

ABCPool was DDOS'd a few days ago, that probably had a small effect. Mostly it's just fluctuation though - network hashrate estimates are based on the number of blocks found in a certain time period, which varies based on luck. (or pseudo-luck)

I wouldnt say it was a ddos because similiar fluctuations happen all the time, I think it changes so wildly because of the variance of luck.
cpt_howdy
Member
**
Offline Offline

Activity: 70



View Profile
February 08, 2012, 09:05:52 PM
 #6

I assumed a lot of variation was due to hashing power following the price of electricity over the course of a day. Does seem to be a strong component with a period of ~24 hours.
DeathAndTaxes
Donator
Legendary
*
Offline Offline

Activity: 1218


Gerald Davis


View Profile
February 08, 2012, 09:17:36 PM
 #7

There are no measurements of the network speed, just estimates.  The estimates are very noisy, particularly on short time frames.

The correct answer seems to have been missed.

There is no way to know the hashrate of the network.  We can only estimate it by looking at block completion time.

IF global network hashing rate was 9,000,000,000,000 hashes/s exactly and never varied the graph would still show variance because it is indirectly estimated hashing power based on block completion time.
BinaryMage
Hero Member
*****
Offline Offline

Activity: 546


Ad astra.


View Profile
February 09, 2012, 12:52:05 AM
 #8


The correct answer seems to have been missed.

There is no way to know the hashrate of the network.  We can only estimate it by looking at block completion time.

IF global network hashing rate was 9,000,000,000,000 hashes/s exactly and never varied the graph would still show variance because it is indirectly estimated hashing power based on block completion time.

ABCPool was DDOS'd a few days ago, that probably had a small effect. Mostly it's just fluctuation though - network hashrate estimates are based on the number of blocks found in a certain time period, which varies based on luck. (or pseudo-luck)

It wasn't missed.  Wink

But thanks for the good intentions anyways.

-- BinaryMage -- | OTC | PGP
Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!