Previously the benchmark code used an integer division (%) with
a non-constant in the inner-loop. This is quite slow on many
processors, especially ones like ARM that lack a hardware divide.
Even on fairly recent x86_64 like haswell an integer division can
take something like 100 cycles-- making it comparable to the
runtime of siphash.
This change avoids the division by using bitmasking instead. This
was especially easy since the count was only increased by doubling.
This change also restarts the timing when the execution time was
very low this avoids mintimes of zero in cases where one execution
ends up below the timer resolution. It also reduces the impact of
the overhead on the final result.
The formatting of the prints is changed to not use scientific
notation make it more machine readable (in particular, gnuplot
croaks on the non-fixedpoint, and it doesn't sort correctly).
This also hoists out all the floating point divisions out of the
semi-hot path because it was easy to do so.
It might be prudent to break out the critical test into a macro
just to guarantee that it gets inlined. It might also make sense
to just save out the intermediate counts and times and get the
floating point completely out of the timing loop (because e.g.
on hardware without a fast hardware FPU like some ARM it will
still be slow enough to distort the results). I haven't done
either of these in this commit.
2a8b358 Fix typo adddrman to addrman as requested in #8070 (Ethan Heilman)
f4119c6 Remove non-determinism which is breaking net_tests #8069 (EthanHeilman)
bf9266e Use Socks5ErrorString() to decode error responses from socks proxy. (Warren Togami)
94fd1d8 Make Socks5() InterruptibleRecv() timeout/failures informative. (Warren Togami)
0d9af79 SOCKS5 connecting and connected messages with -debug=net. (Warren Togami)
00678bd Make failures to connect via Socks5() more informative and less unnecessarily scary. (Warren Togami)
b4d24e1 Report reindexing progress in GUI (Pieter Wuille)
d3d7547 Add -reindex-chainstate that does not rebuild block index (Pieter Wuille)
fb8fad1 Optimize ActivateBestChain for long chains (Pieter Wuille)
316623f Switch reindexing to AcceptBlock in-loop and ActivateBestChain afterwards (Pieter Wuille)
d253ec4 Make ProcessNewBlock dbp const and update comment (Pieter Wuille)
6075bc4 doc: 32 and 64 bit packages are seperate (Wladimir J. van der Laan)
e5764e6 doc: Remove outdated qt4 install information from README.md (Wladimir J. van der Laan)
5d5e7a0 net: No need to export ConnectNode (Cory Fields)
e9ed620 net: No need to export DumpBanlist (Cory Fields)
8b8f877 net: make Ban/Unban/ClearBan functionality consistent (Cory Fields)
cca221f net: Drop CNodeRef for AttemptToEvictConnection (Cory Fields)
563f375 net: use the exposed GetNodeSignals() rather than g_signals directly (Cory Fields)
9faa490 net: remove unused set (Cory Fields)
52cbce2 net: don't import std namespace (Cory Fields)
a68ec21 Use SipHash-2-4 for address relay selection (Pieter Wuille)
8cc9cfe Switch CTxMempool::mapTx to use a hash index for txids (Pieter Wuille)
382c871 Use SipHash-2-4 for CCoinsCache index (Pieter Wuille)
0b1295b Add SipHash-2-4 primitives to hash (Pieter Wuille)
1475ecf Fix de-serialization bug where AddrMan is corrupted after exception * CAddrDB modified so that when de-serialization code throws an exception Addrman is reset to a clean state * CAddrDB modified to make unit tests possible * Regression test created to ensure bug is fixed * StartNode modifed to clear adrman if CAddrDB::Read returns an error code. (EthanHeilman)
fa83a5d [qa] wallet: Temporarily disable salvagewallet test (MarcoFalke)
fadd048 [doc] Link to clang-format in the developer notes (MarcoFalke)
fa72f7d [doc] Remove outdated line from listunspent RPC help, fix typo (MarcoFalke)
ac40ed7 Increase timeout waiting for pruned blk00000.dat (error10)
