Agreed, you need to consider DoS attacks.  I have that in my mind under security and not performance. I'd imagine the test methodology would be completely different since you no longer are attempting to simulate real world traffic.


On Thu, Oct 4, 2012 at 5:55 AM, Joel Joonatan Kaartinen <> wrote:
For script evaluation benchmarking, I don't think just a good
approximation of real-world traffic is enough. You really need to
benchmark the worst case scenarios, otherwise you could be creating a
DoS vulnerability.

- Joel

ke, 2012-10-03 kello 13:57 -0400, Ian Miers kirjoitti:
> Script evaluation performance was what I was primarily concerned
> with.  I'm fooling around with adding some new instruction types.
> The tricky part is that to test how that effects performance, you need
> to be able to intersperse transactions with the new instructions with
> existing ones.  For accuracy, you'd like your simulated traffic to at
> least approximate the real world traffic.
> Also, is there any bench-marking / instrumentation in bitcoind ?
> Ian
> On Wed, Oct 3, 2012 at 1:43 PM, Jeff Garzik <>
> wrote:
>         On Wed, Oct 3, 2012 at 1:38 PM, Ian Miers <>
>         wrote:
>         > Whats the best way to get performance numbers for
>         modifications to bitcoin ?
>         > Profiling it while running on testnet might work, but that
>         would take a
>         > rather long time to get data.
>         > Is there anyway to speed this up  if we only needed to
>         provide  relative
>         > performance between tests. (in a sense a fast performance
>         regression test).
>         You have to be specific about what you're measuring, because
>         "performance" is vague.
>         You can measure many aspects of blockchain performance by
>         importing
>         blocks via -loadblock=FILE.
>         Other performance measurements like "how fast does a block
>         relay
>         through the network" cannot be as easily measured.
>         --
>         Jeff Garzik
>         exMULTI, Inc.
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