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Bockchain:
1. Optim: Multi-thread long-hash computation when encountering groups of blocks.
2. Optim: Cache verified txs and return result from cache instead of re-checking whenever possible.
3. Optim: Preload output-keys when encoutering groups of blocks. Sort by amount and global-index before bulk querying database and multi-thread when possible.
4. Optim: Disable double spend check on block verification, double spend is already detected when trying to add blocks.
5. Optim: Multi-thread signature computation whenever possible.
6. Patch: Disable locking (recursive mutex) on called functions from check_tx_inputs which causes slowdowns (only seems to happen on ubuntu/VMs??? Reason: TBD)
7. Optim: Removed looped full-tx hash computation when retrieving transactions from pool (???).
8. Optim: Cache difficulty/timestamps (735 blocks) for next-difficulty calculations so that only 2 db reads per new block is needed when a new block arrives (instead of 1470 reads).
Berkeley-DB:
1. Fix: 32-bit data errors causing wrong output global indices and failure to send blocks to peers (etc).
2. Fix: Unable to pop blocks on reorganize due to transaction errors.
3. Patch: Large number of transaction aborts when running multi-threaded bulk queries.
4. Patch: Insufficient locks error when running full sync.
5. Patch: Incorrect db stats when returning from an immediate exit from "pop block" operation.
6. Optim: Add bulk queries to get output global indices.
7. Optim: Modified output_keys table to store public_key+unlock_time+height for single transaction lookup (vs 3)
8. Optim: Used output_keys table retrieve public_keys instead of going through output_amounts->output_txs+output_indices->txs->output:public_key
9. Optim: Added thread-safe buffers used when multi-threading bulk queries.
10. Optim: Added support for nosync/write_nosync options for improved performance (*see --db-sync-mode option for details)
11. Mod: Added checkpoint thread and auto-remove-logs option.
12. *Now usable on 32-bit systems like RPI2.
LMDB:
1. Optim: Added custom comparison for 256-bit key tables (minor speed-up, TBD: get actual effect)
2. Optim: Modified output_keys table to store public_key+unlock_time+height for single transaction lookup (vs 3)
3. Optim: Used output_keys table retrieve public_keys instead of going through output_amounts->output_txs+output_indices->txs->output:public_key
4. Optim: Added support for sync/writemap options for improved performance (*see --db-sync-mode option for details)
5. Mod: Auto resize to +1GB instead of multiplier x1.5
ETC:
1. Minor optimizations for slow-hash for ARM (RPI2). Incomplete.
2. Fix: 32-bit saturation bug when computing next difficulty on large blocks.
[PENDING ISSUES]
1. Berkely db has a very slow "pop-block" operation. This is very noticeable on the RPI2 as it sometimes takes > 10 MINUTES to pop a block during reorganization.
This does not happen very often however, most reorgs seem to take a few seconds but it possibly depends on the number of outputs present. TBD.
2. Berkeley db, possible bug "unable to allocate memory". TBD.
[NEW OPTIONS] (*Currently all enabled for testing purposes)
1. --fast-block-sync arg=[0:1] (default: 1)
a. 0 = Compute long hash per block (may take a while depending on CPU)
b. 1 = Skip long-hash and verify blocks based on embedded known good block hashes (faster, minimal CPU dependence)
2. --db-sync-mode arg=[[safe|fast|fastest]:[sync|async]:[nblocks_per_sync]] (default: fastest:async:1000)
a. safe = fdatasync/fsync (or equivalent) per stored block. Very slow, but safest option to protect against power-out/crash conditions.
b. fast/fastest = Enables asynchronous fdatasync/fsync (or equivalent). Useful for battery operated devices or STABLE systems with UPS and/or systems with battery backed write cache/solid state cache.
Fast - Write meta-data but defer data flush.
Fastest - Defer meta-data and data flush.
Sync - Flush data after nblocks_per_sync and wait.
Async - Flush data after nblocks_per_sync but do not wait for the operation to finish.
3. --prep-blocks-threads arg=[n] (default: 4 or system max threads, whichever is lower)
Max number of threads to use when computing long-hash in groups.
4. --show-time-stats arg=[0:1] (default: 1)
Show benchmark related time stats.
5. --db-auto-remove-logs arg=[0:1] (default: 1)
For berkeley-db only. Auto remove logs if enabled.
**Note: lmdb and berkeley-db have changes to the tables and are not compatible with official git head version.
At the moment, you need a full resync to use this optimized version.
[PERFORMANCE COMPARISON]
**Some figures are approximations only.
Using a baseline machine of an i7-2600K+SSD+(with full pow computation):
1. The optimized lmdb/blockhain core can process blocks up to 585K for ~1.25 hours + download time, so it usually takes 2.5 hours to sync the full chain.
2. The current head with memory can process blocks up to 585K for ~4.2 hours + download time, so it usually takes 5.5 hours to sync the full chain.
3. The current head with lmdb can process blocks up to 585K for ~32 hours + download time and usually takes 36 hours to sync the full chain.
Averate procesing times (with full pow computation):
lmdb-optimized:
1. tx_ave = 2.5 ms / tx
2. block_ave = 5.87 ms / block
memory-official-repo:
1. tx_ave = 8.85 ms / tx
2. block_ave = 19.68 ms / block
lmdb-official-repo (0f4a036437fd41a5498ee5e74e2422ea6177aa3e)
1. tx_ave = 47.8 ms / tx
2. block_ave = 64.2 ms / block
**Note: The following data denotes processing times only (does not include p2p download time)
lmdb-optimized processing times (with full pow computation):
1. Desktop, Quad-core / 8-threads 2600k (8Mb) - 1.25 hours processing time (--db-sync-mode=fastest:async:1000).
2. Laptop, Dual-core / 4-threads U4200 (3Mb) - 4.90 hours processing time (--db-sync-mode=fastest:async:1000).
3. Embedded, Quad-core / 4-threads Z3735F (2x1Mb) - 12.0 hours processing time (--db-sync-mode=fastest:async:1000).
lmdb-optimized processing times (with per-block-checkpoint)
1. Desktop, Quad-core / 8-threads 2600k (8Mb) - 10 minutes processing time (--db-sync-mode=fastest:async:1000).
berkeley-db optimized processing times (with full pow computation)
1. Desktop, Quad-core / 8-threads 2600k (8Mb) - 1.8 hours processing time (--db-sync-mode=fastest:async:1000).
2. RPI2. Improved from estimated 3 months(???) into 2.5 days (*Need 2AMP supply + Clock:1Ghz + [usb+ssd] to achieve this speed) (--db-sync-mode=fastest:async:1000).
berkeley-db optimized processing times (with per-block-checkpoint)
1. RPI2. 12-15 hours (*Need 2AMP supply + Clock:1Ghz + [usb+ssd] to achieve this speed) (--db-sync-mode=fastest:async:1000).
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See eb565a1ce208c543392808559ddea709eb1c935b
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library
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New/updated Makefile targets
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There was a workaround for linking to boost at all on MINGW, but
unfortunately this workaround would not correctly link to boost
statically. This workaround for that workaround works around the issue
that that workaround had.
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Also change LMDB Cmake variables to CACHE rather than upgrading them
through several parent scopes.
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CMakeList as that is not part of standard Unbound
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This reverts commit b21335642e75b35d3b178a754f4cdb2314989cd1.
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Make Cmake things aware of BerkeleyDB and BlockchainBDB
Make the BlockchainDB unit tests aware of BlockchainBDB
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Update of the PR with network limits
works very well for all speeds
(but remember that low download speed can stop upload
because we then slow down downloading of blockchain
requests too)
more debug options
fixed pedantic warnings in our code
should work again on Mac OS X and FreeBSD
fixed warning about size_t
tested on Debian, Ubuntu, Windows(testing now)
TCP options and ToS (QoS) flag
FIXED peer number limit
FIXED some spikes in ingress/download
FIXED problems when other up and down limit
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commands and options for network limiting
works very well e.g. for 50 KiB/sec up and down
ToS (QoS) flag
peer number limit
TODO some spikes in ingress/download
TODO problems when other up and down limit
added "otshell utils" - simple logging (with colors, text files channels)
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Usage:
default is lmdb for blockchain branch:
$ make release
same as:
$ DATABASE=lmdb make release
for original in-memory implementation:
$ DATABASE=memory make release
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Merge branch 'monero-project/master' into blockchain
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Working on Linux, needs verified for other platforms but should be fine.
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update for rebase (warptangent 2015-01-04)
src/cryptonote_core/CMakeLists.txt (edit)
- replace LMDB_LIBRARIES with LMDB_LIBRARY set from autodetection
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Some BlockchainDB unit testing fleshed out (and working), rudimentary
linker flag for lmdb in CMakeLists, but should probably be done
"correctly" at some point (find it on whatever system you're building on
and all that jazz).
update for rebase (warptangent 2015-01-04)
fix conflicts with upstream CMakeLists.txt files
tests/CMakeLists.txt (remove edits from original commit)
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f1eaf88 Prints seed after wallet upgrade. Removed iostream include. (Oran Juice)
70971be Doxygen comments (Oran Juice)
031ca23 Rewrites to old wallet file correctly (Oran Juice)
1f833dc Doxygen comments in (Oran Juice)
0bd88ff Writes seed language while generating wallet. Wallet open fix. (Oran Juice)
09a659e Stores seed language in wallet file. added rapidjson. Yet to test backward compatibility (Oran Juice)
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Unfortunately, this is necessary because CMake doesn't detect whether
mingw libraries are static or shared and doesn't put a -static flag around
the -lfoo argument which then makes the shared library be linked to.
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This causes duplicate symbol errors on msys' mingw install.
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There are Windows-related warnings turned into errors here.
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This tells find_path and find_library to look under this directory first
which is what we want on msys2.
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Older versions of CMake support LINK_{PUBLIC,PRIVATE} while newer
versions prefer PUBLIC and PRIVATE instead, but still support the LINK_
prefix.
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pthread is handled by CMAKE_THREAD_LIBS_INIT while libdl isn't needed.
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CMake will auto-dereference variable names in if statements, so there's
no need to dereference them manually.
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The option was set twice when it only needs to be set once. Also fix a
bogus dereference and spurious whitespace.
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CMAKE_BUILD_TYPE is meant for single-config build tools (e.g., make and
ninja) while CMAKE_CONFIGURATION_TYPES is meant for multi-config build
tools (e.g., Xcode and Visual Studio). They should not be mixed or
manually set.
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Instead of using BoldRed and ColourReset everywhere, wrap it up in a
function.
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compatibility
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correctly finding static libs on various operating systems
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As it turns out, some of CMake's built-in modules for detecting headers
and libraries don't work if you have certain compiler flags set, such as
-Werror=old-style-definition, as they do "int main()" rather than
"int main(void)". Having CMake search for libs before compiler flags
are set alleviates this issue, and I believe the underlying issue will
be fixed in future releases of CMake.
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CMake config file written, but was unable to test/get it working
properly because of a bug in CMake with functions related to
find_package. Simple "-lunbound" flag used in its stead for now. May
not build on non-Linux systems, not sure yet.
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The mingw toolchains override this for now.
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This isn't currently working on mingw
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This should link winpthreads. We really shouldn't be passing these this
way, but that seems to be the existing solution, and it works for now.
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The previous code was assuming Apple == Clang. This change should both
enable LTO when using gcc on Apple and fix Clang when using it on other
platforms.
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The new lto format requires use of the gcc-provided gcc-ar and
gcc-ranlib binaries.
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1. Fixed build error on machines not supporting aes-ni.
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