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Performance hit by a million cuts #4079

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opened 2023-12-08 15:34:38 +00:00 by itamarst · 0 comments
itamarst commented 2023-12-08 15:34:38 +00:00
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Tahoe uses a decent amount of CPU.

Profiling shows just lots and lots and lots of tiny little actions. Question is, is there any obvious culprint beyond "it's Python", and if so, can we do anything about it.

Things already investigated:

  • I measured overhead of using plain Deferreds. I'd estimate it's maybe 1% of CPU usage? So probably not that. In future Python versions this might become more significant depending how good the theoretical proposed JIT ends up being, as callbacks may prevent optimizations at that level. But that's not quite the same thing as overhead.

Things to investigate:

  • inlineCallbacks probably has overhead too. I didn't measure it yet.
  • HTTP overhead. Twisted's HTTP parser probably isn't the fastest.
  • Chunk size. If chunking is done in too small of a unit, this increases all the overhead. Larger chunk sizes will help. See #4080
Tahoe uses a decent amount of CPU. Profiling shows just lots and lots and lots of tiny little actions. Question is, is there any obvious culprint beyond "it's Python", and if so, can we do anything about it. Things already investigated: * I measured overhead of using plain Deferreds. I'd estimate it's maybe 1% of CPU usage? So probably not that. In future Python versions this might become more significant depending how good the theoretical proposed JIT ends up being, as callbacks may prevent optimizations at that level. But that's not quite the same thing as overhead. Things to investigate: * inlineCallbacks probably has overhead too. I didn't measure it yet. * HTTP overhead. Twisted's HTTP parser probably isn't the fastest. * Chunk size. If chunking is done in too small of a unit, this increases all the overhead. Larger chunk sizes will help. See #4080
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itamarst added this to the Performance and Benchmarking milestone 2023-12-08 15:34:38 +00:00
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c/code

catch-all for anything that can be fixed by writing code but isn't classified better

  
c/code-dirnodes

anything involving tahoe directories

  
c/code-encoding

immutable-file encoding format/layout, cap format, encoding/decoding algorithms

  
c/code-frontend

general frontend things: new user-facing interfaces, FTP/SFTP servers, FUSE-like interfaces

  
c/code-frontend-cli

CLI tools

  
c/code-frontend-ftp-sftp

   
c/code-frontend-magic-folder

   
c/code-frontend-web

webapi interfaces, user-facing "WUI" interfaces

  
c/code-mutable

anything involving mutable files: encoding/decoding, share format

  
c/code-network

Introducer, locating storage servers, establishing/maintaining connections to them

  
c/code-nodeadmin

node startup/shutdown, tools to create nodes, logging tools, management/monitoring tools, manhole, disk-space-limiting tools

  
c/code-peerselection

server selection/sorting algorithm, rebalancing code, allocation policy, swarming-download

  
c/code-storage

storage-server implementation, share-storage directory layout, client-to-server share transfer protocol

  
c/contrib

problems with non-core things that live in the source:contrib/ directory

  
c/dev-infrastructure

things that help us build Tahoe: buildbot, automated speed/memory/code-coverage tests and results-displayers, IRC channels, mailing lists, this Trac instance

  
c/docs

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c/operational

things involved in running a tahoe grid, external tools to monitor/maintain a grid (like "nodeadmin" but larger-scale). Was also used for issues with the allmydata.com grid.

  
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