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ruslanskorb / TaskConcurrencyManifesto.md
Created June 2, 2022 19:43 — forked from lattner/TaskConcurrencyManifesto.md
Swift Concurrency Manifesto
@ruslanskorb
ruslanskorb / libdispatch-efficiency-tips.md
Last active May 14, 2022 18:30 — forked from tclementdev/libdispatch-efficiency-tips.md
Making efficient use of the libdispatch (GCD)

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

  • You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

  • Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

@ruslanskorb
ruslanskorb / SwiftConcurrency.md
Created November 15, 2020 15:48 — forked from FWEugene/SwiftConcurrency.md
All about concurrency

Threads

Foundation offers a Thread class, internally based on pthread, that can be used to create new threads and execute closures.

// Detaches a new thread and uses the specified selector as the thread entry point.
Thread.detachNewThreadSelector(selector: Selector>, toTarget: Any, with: Any)

// Subclass
class MyThread: Thread {
@ruslanskorb
ruslanskorb / chia-sh-install-sh-2.log
Created December 21, 2019 18:53
https://www.raspberrypi.org/products/raspberry-pi-4-model-b/specifications/ ; https://ubuntu.com/download/raspberry-pi
Requirement already satisfied: wheel in ./.venv/lib/python3.7/site-packages (0.33.6)
Obtaining file:///home/ubuntu/chia-blockchain
Collecting asyncssh
Using cached https://files.pythonhosted.org/packages/cf/3b/9ac19dc6c722f79b97b7878a4ffc872e36e626071e640532a8947649bbb1/asyncssh-2.1.0-py3-none-any.whl
Collecting autoflake
Using cached https://files.pythonhosted.org/packages/88/88/9a8ae06cc31f68b26078cbbef50ae5df361f4ac0efaafbf03a9fa79ca9c5/autoflake-1.3.1.tar.gz
Collecting black
Using cached https://files.pythonhosted.org/packages/fd/bb/ad34bbc93d1bea3de086d7c59e528d4a503ac8fe318bd1fa48605584c3d2/black-19.10b0-py36-none-any.whl
Collecting blspy
Using cached https://files.pythonhosted.org/packages/da/a6/dd8e0395fc25a18289055b843e79eafd9638d64bbd15489f76bf9756222c/blspy-0.1.13.tar.gz
@ruslanskorb
ruslanskorb / chia-sh-install-sh.log
Last active December 21, 2019 17:45
Raspberry Pi 4, Ubuntu 19.10
Requirement already satisfied: wheel in ./.venv/lib/python3.7/site-packages (0.33.6)
Obtaining file:///home/ubuntu/chia-blockchain
Collecting asyncssh (from chiablockchain==1.2.dev5+g5492bbf.d20191221)
Using cached https://files.pythonhosted.org/packages/cf/3b/9ac19dc6c722f79b97b7878a4ffc872e36e626071e640532a8947649bbb1/asyncssh-2.1.0-py3-none-any.whl
Collecting autoflake (from chiablockchain==1.2.dev5+g5492bbf.d20191221)
Using cached https://files.pythonhosted.org/packages/88/88/9a8ae06cc31f68b26078cbbef50ae5df361f4ac0efaafbf03a9fa79ca9c5/autoflake-1.3.1.tar.gz
Collecting black (from chiablockchain==1.2.dev5+g5492bbf.d20191221)
Using cached https://files.pythonhosted.org/packages/fd/bb/ad34bbc93d1bea3de086d7c59e528d4a503ac8fe318bd1fa48605584c3d2/black-19.10b0-py36-none-any.whl
Collecting blspy (from chiablockchain==1.2.dev5+g5492bbf.d20191221)
Using cached https://files.pythonhosted.org/packages/da/a6/dd8e0395fc25a18289055b843e79eafd9638d64bbd15489f76bf9756222c/blspy-0.1.13.tar.gz
@ruslanskorb
ruslanskorb / chia-create_plots-k30n7-alpha-1-1.txt
Created December 19, 2019 06:41
Device Name: APPLE SSD SM0256L Media Name: AppleAPFSMedia Medium Type: SSD Protocol: PCI-Express Internal: Yes Partition Map Type: Unknown SMART Status: Verified
(.venv) ➜ chia-blockchain git:(master) ✗ python -m scripts.create_plots -k 30 -n 7
Creating 7 plots of size 30, sk_seed dd999d5920aceabd81f489642386e09fccb53187f263557f7518e3cf803aa492 ppk <PublicKey 1030db04c277980405f8bb6f34b2381c4c2817e4ee201f62136323a2c66487f3f7d4103ee991a7c5444f1f416c100353>
Plot plot-0-30-e048926f080fbbf06c7f26b40733d7a7ec01a132b39dcec3a093c46850124dc0.dat already exists
Plot plot-1-30-1c24294a8eb4fe58efd9c23f13969fc5eeef4d9357e33f79757ac949e7b76d61.dat already exists
Plot plot-2-30-96d203865c1531056e1155b6bd3a9daece879b9c6b299b1aeedded8c5f858a44.dat already exists
Plot plot-3-30-71a56b50f796b42c6a818f10ba613d13a4af80239e6d67c120e5db8098153628.dat already exists
Plot plot-4-30-8ca4733c3e5bac6dce23572dd30ae1ef7a5584004a740dddda5b3ffc8c5cb885.dat already exists
Plot plot-5-30-3bc4ab9849dffa2411e63507d0e9308babe182d6f2c01b1d44c70037c2694c1b.dat already exists
Starting plotting progress into file /Users/ruslanskorb/chia-blockchain/plots/plot-6-30-42c67a3b864d7526b924602ab1832e04fe82300653
@ruslanskorb
ruslanskorb / run_farming.logs
Created December 8, 2019 08:19
Run farming errors
Last login: Sun Dec 8 10:17:16 on console
cd% ➜ ~ cd /Volumes/Chia/chia-blockchain
➜ chia-blockchain git:(master) ✗ mongod --fork --dbpath ./db/ --logpath mongod.log
about to fork child process, waiting until server is ready for connections.
forked process: 766
child process started successfully, parent exiting
➜ chia-blockchain git:(master) ✗ . .venv/bin/activate
(.venv) ➜ chia-blockchain git:(master) ✗ sh ./scripts/run_farming.sh
kill: 810: No such process
Traceback (most recent call last):
@ruslanskorb
ruslanskorb / chia-create_plots-k30n3.txt
Last active December 8, 2019 07:56
Device Name: STOR.E ALU 2S Media Name: AppleAPFSMedia Protocol: USB Internal: No Partition Map Type: Unknown
(.venv) ➜ chia-blockchain git:(master) ✗ python -m scripts.create_plots -k 30 -n 3
Creating 3 plots of size 30, sk_seed dd999d5920aceabd81f489642386e09fccb53187f263557f7518e3cf803aa492 ppk <PublicKey 1030db04c277980405f8bb6f34b2381c4c2817e4ee201f62136323a2c66487f3f7d4103ee991a7c5444f1f416c100353>
Plot plot-0-30-e048926f080fbbf06c7f26b40733d7a7ec01a132b39dcec3a093c46850124dc0.dat already exists
Starting plotting progress into file /Volumes/Chia/chia-blockchain/plots/plot-1-30-1c24294a8eb4fe58efd9c23f13969fc5eeef4d9357e33f79757ac949e7b76d61.dat.
Memo:
ID: 1c24294a8eb4fe58efd9c23f13969fc5eeef4d9357e33f79757ac949e7b76d61
Plot size is: 30
Starting phase 1/4: Forward Propagation...
@ruslanskorb
ruslanskorb / chia-create_plots-k30n1.txt
Last active December 7, 2019 07:02
Device Name: APPLE SSD SM0256L Media Name: AppleAPFSMedia Medium Type: SSD Protocol: PCI-Express Internal: Yes Partition Map Type: Unknown SMART Status: Verified
Last login: Thu Dec 5 18:17:32 on ttys001
➜ chia-blockchain git:(master) ✗ . .venv/bin/activate
(.venv) ➜ chia-blockchain git:(master) ✗ python -m scripts.create_plots -k 30 -n 1
Creating 1 plots of size 30, sk_seed dd999d5920aceabd81f489642386e09fccb53187f263557f7518e3cf803aa492 ppk <PublicKey 1030db04c277980405f8bb6f34b2381c4c2817e4ee201f62136323a2c66487f3f7d4103ee991a7c5444f1f416c100353>
Starting plotting progress into file /Users/ruslanskorb/chia-blockchain/plots/plot-0-30-e048926f080fbbf06c7f26b40733d7a7ec01a132b39dcec3a093c46850124dc0.dat.
Memo:
ID: e048926f080fbbf06c7f26b40733d7a7ec01a132b39dcec3a093c46850124dc0
Plot size is: 30
@ruslanskorb
ruslanskorb / ChiaFullNode+Docker.logs
Last active December 6, 2019 04:44
FullNode src.full_node : INFO 04:14:29.998 This is the first block at height 2106, so propagate.
FullNode src.full_node : INFO 04:14:30.011 New best unfinished block at height 2106
FullNode src.server.server : INFO 04:14:30.018 -> unfinished_block to peer ('206.80.236.251', 8444)
FullNode src.server.server : INFO 04:14:30.031 -> unfinished_block to peer ('206.80.236.251', 8444)
FullNode src.server.server : INFO 04:14:31.068 <- unfinished_block from peer ('206.80.236.251', 8444)
FullNode src.server.server : INFO 04:14:31.342 <- unfinished_block from peer ('206.80.236.251', 8444)
FullNode src.server.server : INFO 04:14:33.904 <- unfinished_block from peer ('18.179.4.125', 8444)
FullNode src.server.server : INFO 04:14:37.582 <- unfinished_block from peer ('206.80.236.251', 8444)
FullNode src.server.server : INFO 04:14:40.786 Connection with ('18.232.223.201', 8444) established
FullNode src.server.server : INFO 04:14