bitcoind takes 670% CPU usage at first sync #6358

1. 
   Mellnik commented at 8:31 pm on June 30, 2015: none

   and a unix load of 6.41 even though I only have a Quad Core CPU. It renders my machine fully unusable. I set it’s nice value to 10 for now.

   http://puu.sh/iIDtg/021875dd2a.png

2. 
   laanwj commented at 6:19 am on July 1, 2015: member

   Which version? What arguments / bitcoin.conf settings? You’re sure you don’t have -gen=1 enabled?

   You an try e.g. -par=1 to reduce the number of script verification threads. By default it uses as many threads as there are cores available minus one, but it may be mis-estimating this.

   Can you find a message like this in your debug.log:

   02015-06-29 09:35:16 Using 5 threads for script verification
   

3. laanwj added the label Validation on Jul 1, 2015
4. 
   Mellnik commented at 12:07 pm on July 1, 2015: none

   0.10.2 x64

   Config:

    0disablewallet=1
    1maxconnections=1000
    2timeout=10000
    3allowreceivebyip=1
    4
    5bind=213.163.74.163:8333
    6bind=[2a00:1630:2:1901::b7c]:8333
    7rpcuser=bitcoinrpc
    8rpcpassword=xyz
    9
   10addnode=node.bitcoin.xxx
   11addnode=x.jine.se
   12addnode=bitcoin.coinprism.com
   13addnode=btcnode1.evolyn.net
   14addnode=faucet.bitcoin.st
   15
   16addnode=messier.bzfx.net
   

   screen ./bitcoind -server

   By now I rsynced the blockchain from my older node. CPU usage now at 1.8% after all blocks are present.

   02015-06-30 21:05:40 Using 8 threads for script verification
   

   Probably 8 because of HT.

5. 
   laanwj commented at 3:34 pm on July 1, 2015: member

   So it looks like boost::thread::hardware_concurrency(), which is used to determine the default concurrency, also counts ‘fake’ HT cores. It is a bit disappointing but I’m not sure what underlying APIs for querying this that operating systems expose in any case.

   There is also boost::thread::physical_concurrency() maybe it works better, as it claims not to count ‘virtual cores’.

6. laanwj referenced this in commit 401ee9a978 on Jul 1, 2015
7. laanwj referenced this in commit 47162673c7 on Jul 1, 2015
8. luke-jr referenced this in commit fabfc4d39e on Jul 2, 2015
9. 
   sipa commented at 11:15 pm on July 9, 2015: member

   I’m marking this as fixed by #6361. Comment if this is not correct, please.
10. sipa closed this on Jul 9, 2015

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Contributors
Mellnik laanwj sipa

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