Multiple bitcoind on one machine - page 2.

markm

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Quote from: payb.tc on August 06, 2011, 08:07:24 AM

Quote from: 2112 on August 05, 2011, 09:19:01 PM

The overhead can be stupendous though.

You mean as in ram usage or are you talking about something else?

i was able to get 2 running successfully for a while on a test server.

I wonder what the record is for the most amount of bitcoind instances running together successfully... anyone running 3 or more?

Even my quite old machines are not having any problems running multiple *coind instances all at once and all on the same user account. (bitcoind botcoind britcoind cdnbitcoind czbitcoind devcoind gmcbitcoind grfbitcoind groupcoind multicoind namecoind unbitcoind ...)

-MarkM-

payb.tc

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Quote from: 2112 on August 06, 2011, 09:45:33 AM

Quote from: payb.tc on August 06, 2011, 09:06:05 AM

so i guess the solution is to modify bitcoind so that it can perform the functions of multiple bitcoind instances?
run several wallets at the same time, separately, all from the one binary and one set of ports.

I think I responded to you in the PHP thread. Your only hope is that libbitcoin development group delivers something useable. The core development team is actively working against this goal. What you have here is the essence of using obfuscated C++ code for the purpose of guerrilla warfare amongst the competing software development teams. Satoshi is/was a grand-master of it.

which goal? what's wrong with one instance of bitcoind managing multiple wallets?

2112

legendary

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Quote from: payb.tc on August 06, 2011, 09:06:05 AM

so i guess the solution is to modify bitcoind so that it can perform the functions of multiple bitcoind instances?
run several wallets at the same time, separately, all from the one binary and one set of ports.

I think I responded to you in the PHP thread. Your only hope is that libbitcoin development group delivers something useable. The core development team is actively working against this goal. What you have here is the essence of using obfuscated C++ code for the purpose of guerrilla warfare amongst the competing software development teams. Satoshi is/was a grand-master of it.

payb.tc

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Activity: 812

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so i guess the solution is to modify bitcoind so that it can perform the functions of multiple bitcoind instances?

run several wallets at the same time, separately, all from the one binary and one set of ports.

2112

legendary

Activity: 2128

Merit: 1073

Quote from: payb.tc on August 06, 2011, 08:07:24 AM

You mean as in ram usage or are you talking about something else?

RAM doesn't seem to be a problem. The worst are: disk access queues and disk space usage. Then there's a CPU use spikes and network traffic spikes during operation when separate daemons duplicate their work. Last but not least is the outgoing network connectivity which gets close to launching a non-distributed DoS on the servers when your multi-bitcoind machine restarts after maintenance.

Overall it isn't pretty and it would be hard to maintain and troubleshoot.

Furyan

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Quote from: payb.tc on August 06, 2011, 08:07:24 AM

Quote from: 2112 on August 05, 2011, 09:19:01 PM

The overhead can be stupendous though.

You mean as in ram usage or are you talking about something else?

i was able to get 2 running successfully for a while on a test server.

I wonder what the record is for the most amount of bitcoind instances running together successfully... anyone running 3 or more?

I heard of someone running 8. I never did hear how that worked out

payb.tc

hero member

Activity: 812

Merit: 1000

Quote from: 2112 on August 05, 2011, 09:19:01 PM

The overhead can be stupendous though.

You mean as in ram usage or are you talking about something else?

i was able to get 2 running successfully for a while on a test server.

I wonder what the record is for the most amount of bitcoind instances running together successfully... anyone running 3 or more?

Furyan

full member

Activity: 175

Merit: 102

Quote from: 2112 on August 05, 2011, 09:19:01 PM

Quote from: MrJoshua on August 05, 2011, 09:04:05 PM

Is is possible to run multiple bitcoind instances on a single machine?

Yes. Each one has to be under a different account and use "-rpcport" (documented) and "-port" (undocumented) or "-nolisten". The overhead can be stupendous though.

Instead of "-port" you can use -connectnode and have it connect to an already-running bitcoin to do the peer communication.

And you don't have to run them on a different account, you can just use the -datadir flag to point the second instance to a different folder. It will rebuild its own block chain, or you can copy over the existing one to that data dir. They'll have separate wallets though.

See Gavin Andresen's instructions here:

https://bitcointalksearch.org/topic/running-on-a-port-other-than-8333-589

2112

legendary

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Quote from: MrJoshua on August 05, 2011, 09:04:05 PM

Is is possible to run multiple bitcoind instances on a single machine?

Yes. Each one has to be under a different account and use "-rpcport" (documented) and "-port" (undocumented) or "-nolisten". The overhead can be stupendous though.

MrJoshua

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Merit: 12

Is is possible to run multiple bitcoind instances on a single machine?

I'm trying to develop some web services. One of those services needs the ability to process unique wallet files / private keys for each user. Currently this is impractical because the amount of time it takes to flush and relaunch bitcoind with rescan to load unique wallets. Even though this takes time, it could be somewhat manageable if I can run a bitcoind for every active user session. I can use multiple servers, but I'd like to be able run more then one bitcoind per server instance to make more effective use of each server's resources.

I suspect dynamic wallet switching directly in bitcoind is still a bit far off right?

Thanks,
j

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