Hi,
I forgot create backup of my wallets before reinstalling system.
What files do I need to recover, and where they need to be placed?
Thanks
Topic: MultiBit - page 17. (Read 336309 times)
Hi Mike,
The wallets are marked as dirty and then there is a background task running every 90 seconds to save the wallet. (I think it was 120 seconds on earlier versions).,
It might also be that I overwrite all the files with nonsense data byte by byte before deleting them.
The wallets are marked as dirty and then there is a background task running every 90 seconds to save the wallet. (I think it was 120 seconds on earlier versions).,
It might also be that I overwrite all the files with nonsense data byte by byte before deleting them.
Jim, what autosave delay are you using? I wonder if the issue is the mmapped chain file or the wallet.
I had some more time today and tracked it down even further, actually its only the barrier=0 mount option that affects this huge slowness/speedup, I have changed my mount options back to the dafault data=ordered again (undid my changes using tune2fs and removing the boot parameter) and the only mount option remaining that makes the difference between 1 minute and 1 second is barrier=0
Hi Prof7bit
Thanks for tracking this down - it has been noticed by a couple of people but we never tracked down what the problem was.
Good that you have identified a workaround.
Thanks for tracking this down - it has been noticed by a couple of people but we never tracked down what the problem was.
Good that you have identified a workaround.
I am suddenly experiencing extreme problems with MultiBit freezing while causing extreme Disk-IO for at least a minute until it becomes responsible again.
* Open MultiBit and wait: after 20 seconds or so it will start showing high disk-IO for one minute.
* Open MultiBit and immediately close it again: writes "saving walllet" to title bar and is frozen for a whole minute before it closes.
* Open MultiBit, click send and then click new: frozen for 1 minute with high disk io. Enter address and amount, click send: frozen for another minute, enter wallet password: frozen for another minute. First confirmation arrives: frozen for another minute.
I previously had this wallet on my old ThinkPad Pentium-M, 1.3GHz with 500MB RAM and extremely slow HDD (and btrfs!) without any problems. Now I have a 6 core AMD machine 6*3.5GHz and SATA3 HDD (ext4), running Kubuntu 12.04, completely fresh install, only 5 days old, installed latest MultiBit, opened same wallet file and these problems began. I already tried resetting the block chain (this went astonishingly fast compared to my old Laptop) but its still showing these symptoms. I tried to preload libeatmydata.so to disable fsync() but it makes no difference.
What could be causing this? It became essentially unusable. How can I help debugging or solving this problem?
Edit:
Found it. It seems MultiBit is doing something that completely overwhelms the journaling mechanism of ext4. Now I followed these instructions: http://blog.smartlogicsolutions.com/2009/06/04/mount-options-to-improve-ext4-file-system-performance/ (and also the one in the comments regarding the change to the grub config before rebooting), now my mount options are (data=writeback,barrier=0,commit=600,noatime,nobh,errors=remount-ro) and the time went down from 1 minute to 1 second!
* Open MultiBit and wait: after 20 seconds or so it will start showing high disk-IO for one minute.
* Open MultiBit and immediately close it again: writes "saving walllet" to title bar and is frozen for a whole minute before it closes.
* Open MultiBit, click send and then click new: frozen for 1 minute with high disk io. Enter address and amount, click send: frozen for another minute, enter wallet password: frozen for another minute. First confirmation arrives: frozen for another minute.
I previously had this wallet on my old ThinkPad Pentium-M, 1.3GHz with 500MB RAM and extremely slow HDD (and btrfs!) without any problems. Now I have a 6 core AMD machine 6*3.5GHz and SATA3 HDD (ext4), running Kubuntu 12.04, completely fresh install, only 5 days old, installed latest MultiBit, opened same wallet file and these problems began. I already tried resetting the block chain (this went astonishingly fast compared to my old Laptop) but its still showing these symptoms. I tried to preload libeatmydata.so to disable fsync() but it makes no difference.
What could be causing this? It became essentially unusable. How can I help debugging or solving this problem?
Edit:
Found it. It seems MultiBit is doing something that completely overwhelms the journaling mechanism of ext4. Now I followed these instructions: http://blog.smartlogicsolutions.com/2009/06/04/mount-options-to-improve-ext4-file-system-performance/ (and also the one in the comments regarding the change to the grub config before rebooting), now my mount options are (data=writeback,barrier=0,commit=600,noatime,nobh,errors=remount-ro) and the time went down from 1 minute to 1 second!
Hey devs, how about a multicoin wallet ? 
Would be the best wallet ever to have BTC, LTC, DOGE, USDe, DGC, SMC and such coins in the same wallet, being able to create addresses for each coin in the same wallet ?
Any change to see something like that in the future.
Would be the best wallet ever to have BTC, LTC, DOGE, USDe, DGC, SMC and such coins in the same wallet, being able to create addresses for each coin in the same wallet ?
Any change to see something like that in the future.
Super program, I love multibit!
How can I find out the Public key to an address?
Like verifyaddress?
See posting #20 over here:
https://bitcointalksearch.org/topic/m.4649637
Thnx!
How can I find out the Public key to an address?
Like verifyaddress
See posting #20 over here:
https://bitcointalksearch.org/topic/m.4649637
Thnx!
@noobyonekenobi
If you could raise bugs on the bugs/ issues database with details like operating system, screenshots etc that would be helpful.
If you could raise bugs on the bugs/ issues database with details like operating system, screenshots etc that would be helpful.
Im having problem with multibit .5.16. Everytime i opend it my desktop lags and after a while the multbit windows becomes black and i cant use it. What do you think seems to be the problem?
6. The wallet looks through the new blocks' transactions and stores (in the wallet) the transactions that either send it bitcoin or that confirm its previous spends.
7. MultiBit stores the headers only of the new blocks into its local copy of the blockchain, It does not store the transactions themselves. This is the main reason the MultiBit blockchain is so much smaller than the bitcoind blockchain.
7. MultiBit stores the headers only of the new blocks into its local copy of the blockchain, It does not store the transactions themselves. This is the main reason the MultiBit blockchain is so much smaller than the bitcoind blockchain.
a) That local copy of the (headers only) blockchain is the multibit.spvchain file?
b) If i 'm getting this right the only case that multibit.spvchain updates is when someone sends me coins or when i send some right?
c) Is b. the problem why we can't see the number of confirmations for each transaction?
Also a question mostly about bitcoinj but i think the issue applies to multibit as well
From bitcoinj's wiki
Code:
The Wallet code doesn't scale, at all. All transactions that were ever relevant to the wallet are loaded into
memory, all the time, and re-written every time the wallet is saved. This results in a simple on-disk format accessible
to many kinds of apps, but has poor performance for heavy users. Also, even if spent transactions are removed, the
algorithms used for selecting coins and working with unspent transactions have quadratic time complexity or worse.
In time we'll probably switch to a log structured wallet file format to solve this.
What does this mean? That every time the multibit.spvchain is loaded in the memory?
Ah, fair enough. And no way to combine either I'd imagine.
I'll be more careful next time.
I'll be more careful next time.
@noodle73
This is almost certainly that the wallets have different private keys/ addresses in them.
It is very easy to get two wallets out of sync so I don't recommend having the same wallet on two different computers.
With the current random key addresses it is just too confusing.
(It will be different with deterministic wallets)
This is almost certainly that the wallets have different private keys/ addresses in them.
It is very easy to get two wallets out of sync so I don't recommend having the same wallet on two different computers.
With the current random key addresses it is just too confusing.
(It will be different with deterministic wallets)
I've got Multibit on two computers, and both are showing different balances.
I've reset the block chain on both but that's not fixing it. Could it be that one doesn't have all the receiving addresses?
What's the best way to synchronise? Is it to re-export and then re-import the keys?
Many thanks
I've reset the block chain on both but that's not fixing it. Could it be that one doesn't have all the receiving addresses?
What's the best way to synchronise? Is it to re-export and then re-import the keys?
Many thanks
You get that if some of the transactions don't accurately match what is on the blockchain (for whatever reason).
If you do a 'Tools ! Reset blockchain and transactions' from the day before the first transaction it will go to a Bitcoin node and recreate everything.
Can't promise you'll end up with $35k though. :-)
i have same problem. I have 2 computers. yesterday I was transferred my 3.14 BTC from one to another. after that, I sent 50$ BTC to my friend.If you do a 'Tools ! Reset blockchain and transactions' from the day before the first transaction it will go to a Bitcoin node and recreate everything.
Can't promise you'll end up with $35k though. :-)
But multibit showed something spendable BTC!
I've been trying to"Reset blockchain and transactions" since yesterday but nothing change!
I experienced the same problem before, i lost 1 BTC 1 months ago!
http://i41.tinypic.com/2r2vzu1.png
http://i39.tinypic.com/2zsa9gj.png
Thanks for your reply.
Did that. Aaaaand it's gone.
This balance glitch is the most emotionally cruel bug I have ever encountered. J
...
Did that. Aaaaand it's gone.
This balance glitch is the most emotionally cruel bug I have ever encountered. J
...
It's not a bug, it's a feature
Thanks for your reply.
Did that. Aaaaand it's gone.
This balance glitch is the most emotionally cruel bug I have ever encountered. J
edit: Don't get me wrong. I like your client. Keep up the good work!
Did that. Aaaaand it's gone.
This balance glitch is the most emotionally cruel bug I have ever encountered. J
edit: Don't get me wrong. I like your client. Keep up the good work!
You get that if some of the transactions don't accurately match what is on the blockchain (for whatever reason).
If you do a 'Tools ! Reset blockchain and transactions' from the day before the first transaction it will go to a Bitcoin node and recreate everything.
Can't promise you'll end up with $35k though. :-)
If you do a 'Tools ! Reset blockchain and transactions' from the day before the first transaction it will go to a Bitcoin node and recreate everything.
Can't promise you'll end up with $35k though. :-)
I am sorry if this has been asked before but I want to be 102% sure.
I found an old wallet.dat and imported it into Multibit and to my suprise it showed a balance of 35,000$. Yay!
But I could not send the coins. The transaction gets confirmed by one peer only. And after resetting the blockchain my balance is 0$. Do'h!
Soo..There is no way that I am rich actually? Just a glitch in the balance display?
I found an old wallet.dat and imported it into Multibit and to my suprise it showed a balance of 35,000$. Yay!
But I could not send the coins. The transaction gets confirmed by one peer only. And after resetting the blockchain my balance is 0$. Do'h!
Soo..There is no way that I am rich actually? Just a glitch in the balance display?
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