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Gophers Code Reading Party records
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20210708 Gophers Code Reading Party #7

Closed budougumi0617 closed 1 year ago

budougumi0617 commented 3 years ago

2021/07/08（木） 15:00~16:00@ Zoom, BASE BANK, Inc.

https://chouseisan.com/s?h=5c804ff51e9648598471b2a02ca5283f

参加者

お題

budougumi0617 commented 3 years ago

2021年後半もよろしくおねがいします！！ また遅くなってしまいましたが日程調整です 🙏 https://chouseisan.com/s?h=5c804ff51e9648598471b2a02ca5283f

budougumi0617 commented 3 years ago

お題候補 ゼロから作る時系列データベースエンジン https://zenn.dev/nakabonne/articles/d300838a1500c7 https://github.com/nakabonne/tstorage

budougumi0617 commented 3 years ago

2021/07/08（木） 15:00~16:00にしようと思います、よろしくお願いいたします！ （BASEメンバーはカレンダー招待済み）

budougumi0617 commented 3 years ago

今日はこちらのzoomでお願いします！！！ https://zoom.us/j/91783735964?pwd=cktGSW51clAvdVJQcmtlN2pVQm1xZz09

hgsgtk commented 3 years ago

今日は参加できるかなぁって思ってたんですけど...

budougumi0617 commented 3 years ago

このまえみたtestime、Parallel + テーブル駆動テストでもちゃんと動くようになっていた！ https://tenntenn.dev/ja/posts/2021-07-06-testtime/

hgsgtk commented 3 years ago

最近proxy serverの知見を3年ぶりに読み返したら面白かったという論理コメントだけおくだけしてね...

https://engineering.mercari.com/blog/entry/2018-12-05-105737/

budougumi0617 commented 3 years ago

aliの中でつかっているらしい。 https://github.com/nakabonne/ali

https://github.com/basebank/gophers-code-reading-party/issues/7#issuecomment-871564471

daisuzu commented 3 years ago

https://github.com/patrickmn/go-cache

budougumi0617 commented 3 years ago

今日のお題

デバッグどうするんや！！！

daisuzu commented 3 years ago

https://github.com/go-delve/delve

cureseven commented 3 years ago

みんなgoland。補完便利 daisuzuさんはvim test カバレッジとるためにvimで吐いてエディタで開くをやっている 最近golandでもできるようになったかも知れない

hgsgtk commented 3 years ago

最近VSCodeも手に馴染んできました (InteliJ Key bindのおかげで）

hgsgtk commented 3 years ago

BGM的に聞きに来ました（別の仕事をしながらですが...

budougumi0617 commented 3 years ago

VSCodeもデバッグできるよ！！ 適当にブレークポイントをはったあと、main関数にフォーカスをあててF5でデバッグを開始すればサーバのデバッグもできる （Docker上のサーバとかだとちょっとめんどくさい

cureseven commented 3 years ago

delveは最初go toolsインストール時に入っている dockerのプロセスで実行したいならlaunch.jsonをいじる必要がある curlで普通に実行する分には止まってくれそう

hgsgtk commented 3 years ago

チョットだけ観戦して @cureseven さんの悩みが解決して 888888 って思いました（あと清水さんのあのツイートのあれこれはそういう背景だったんですねっていう知見を得ました（ハイコンテキスト

（次予定の準備で抜けますmm

budougumi0617 commented 3 years ago

リモートサーバ上のプロセスに対してデバッグしたいときは↓のやりかたで接続できます https://github.com/go-delve/delve/blob/c223ef656da3ddbab3a58ea87108d4217731a01c/Documentation/faq.md#how-can-i-use-delve-for-remote-debugging

daisuzu commented 3 years ago

こっちは結構前から差分が出せたけど、いつの間にか go tool pprof でも差分が見られるようになってた https://github.com/google/pprof

daisuzu commented 3 years ago 
$ go tool pprof -h
usage:

Produce output in the specified format.

   pprof <format> [options] [binary] <source> ...

Omit the format to get an interactive shell whose commands can be used
to generate various views of a profile

   pprof [options] [binary] <source> ...

Omit the format and provide the "-http" flag to get an interactive web
interface at the specified host:port that can be used to navigate through
various views of a profile.

   pprof -http [host]:[port] [options] [binary] <source> ...

Details:
  Output formats (select at most one):
    -callgrind       Outputs a graph in callgrind format
    -comments        Output all profile comments
    -disasm          Output assembly listings annotated with samples
    -dot             Outputs a graph in DOT format
    -eog             Visualize graph through eog
    -evince          Visualize graph through evince
    -gif             Outputs a graph image in GIF format
    -gv              Visualize graph through gv
    -kcachegrind     Visualize report in KCachegrind
    -list            Output annotated source for functions matching regexp
    -pdf             Outputs a graph in PDF format
    -peek            Output callers/callees of functions matching regexp
    -png             Outputs a graph image in PNG format
    -proto           Outputs the profile in compressed protobuf format
    -ps              Outputs a graph in PS format
    -raw             Outputs a text representation of the raw profile
    -svg             Outputs a graph in SVG format
    -tags            Outputs all tags in the profile
    -text            Outputs top entries in text form
    -top             Outputs top entries in text form
    -topproto        Outputs top entries in compressed protobuf format
    -traces          Outputs all profile samples in text form
    -tree            Outputs a text rendering of call graph
    -web             Visualize graph through web browser
    -weblist         Display annotated source in a web browser

  Options:
    -call_tree       Create a context-sensitive call tree
    -compact_labels  Show minimal headers
    -divide_by       Ratio to divide all samples before visualization
    -drop_negative   Ignore negative differences
    -edgefraction    Hide edges below <f>*total
    -focus           Restricts to samples going through a node matching regexp
    -hide            Skips nodes matching regexp
    -ignore          Skips paths going through any nodes matching regexp
    -intel_syntax    Show assembly in Intel syntax
    -mean            Average sample value over first value (count)
    -nodecount       Max number of nodes to show
    -nodefraction    Hide nodes below <f>*total
    -noinlines       Ignore inlines.
    -normalize       Scales profile based on the base profile.
    -output          Output filename for file-based outputs
    -prune_from      Drops any functions below the matched frame.
    -relative_percentages Show percentages relative to focused subgraph
    -sample_index    Sample value to report (0-based index or name)
    -show            Only show nodes matching regexp
    -show_from       Drops functions above the highest matched frame.
    -source_path     Search path for source files
    -tagfocus        Restricts to samples with tags in range or matched by regexp
    -taghide         Skip tags matching this regexp
    -tagignore       Discard samples with tags in range or matched by regexp
    -tagshow         Only consider tags matching this regexp
    -trim            Honor nodefraction/edgefraction/nodecount defaults
    -trim_path       Path to trim from source paths before search
    -unit            Measurement units to display

  Option groups (only set one per group):
    granularity      
      -functions       Aggregate at the function level.
      -filefunctions   Aggregate at the function level.
      -files           Aggregate at the file level.
      -lines           Aggregate at the source code line level.
      -addresses       Aggregate at the address level.
    sort             
      -cum             Sort entries based on cumulative weight
      -flat            Sort entries based on own weight

  Source options:
    -seconds              Duration for time-based profile collection
    -timeout              Timeout in seconds for profile collection
    -buildid              Override build id for main binary
    -add_comment          Free-form annotation to add to the profile
                          Displayed on some reports or with pprof -comments
    -diff_base source     Source of base profile for comparison
    -base source          Source of base profile for profile subtraction
    profile.pb.gz         Profile in compressed protobuf format
    legacy_profile        Profile in legacy pprof format
    http://host/profile   URL for profile handler to retrieve
    -symbolize=           Controls source of symbol information
      none                  Do not attempt symbolization
      local                 Examine only local binaries
      fastlocal             Only get function names from local binaries
      remote                Do not examine local binaries
      force                 Force re-symbolization
    Binary                  Local path or build id of binary for symbolization
    -tls_cert             TLS client certificate file for fetching profile and symbols
    -tls_key              TLS private key file for fetching profile and symbols
    -tls_ca               TLS CA certs file for fetching profile and symbols

  Misc options:
   -http              Provide web interface at host:port.
                      Host is optional and 'localhost' by default.
                      Port is optional and a randomly available port by default.
   -no_browser        Skip opening a browser for the interactive web UI.
   -tools             Search path for object tools

  Legacy convenience options:
   -inuse_space           Same as -sample_index=inuse_space
   -inuse_objects         Same as -sample_index=inuse_objects
   -alloc_space           Same as -sample_index=alloc_space
   -alloc_objects         Same as -sample_index=alloc_objects
   -total_delay           Same as -sample_index=delay
   -contentions           Same as -sample_index=contentions
   -mean_delay            Same as -mean -sample_index=delay

  Environment Variables:
   PPROF_TMPDIR       Location for saved profiles (default $HOME/pprof)
   PPROF_TOOLS        Search path for object-level tools
   PPROF_BINARY_PATH  Search path for local binary files
                      default: $HOME/pprof/binaries
                      searches $name, $path, $buildid/$name, $path/$buildid
   * On Windows, %USERPROFILE% is used instead of $HOME
daisuzu commented 3 years ago

https://logmi.jp/tech/articles/322787

yuzuy commented 3 years ago

ISUCONのためのpprofというタイムリーなやつ(GoCon 19 Summer in Fukuoka) https://fukuoka.gocon.jp/speakers/seike460/

budougumi0617 commented 3 years ago

pprofのことGoCon2019 automnではっぴょうしたひとがいそう？ https://twitter.com/karupanerura/status/1188676863675076609

探してみる A.I. @budougumi0617

cureseven commented 3 years ago

alp良さそう kataribeよりみやすそう alpも正規表現によるgroupingは必要そう alpは本などでよく解析ツールとして使われているのを見る

budougumi0617 commented 3 years ago

ISUCONだと初手pprofつかうよりまずアクセスログ見ることが多いかも https://github.com/matsuu/kataribe https://github.com/tkuchiki/alp

budougumi0617 commented 3 years ago

先週のGolang weeklyのトピック e-book 100 Go Mistakes (2022) https://medium.com/solvingalgo/100-go-mistakes-2022-4debd9449a72

rscがめちゃくちゃ良いブログ（たぶん）かいてるよ メモリモデル https://research.swtch.com/mm

budougumi0617 commented 3 years ago

go fuzzリリースへの道

[dev.fuzz] all: tracking issue for release-blocking fuzzing work https://github.com/golang/go/issues/47037

budougumi0617 commented 3 years ago

go getからgo install へ https://utcc.utoronto.ca/~cks/space/blog/programming/GoAndDeprecatingGoGet

daisuzu commented 3 years ago

go install golang.org/x/tools/gopls@master golang.org/x/tools@master が使えるようになる？

cureseven commented 3 years ago

ghq getはバイナリファイル生成までできない go get go installはバイナリファイル生成するまで

budougumi0617 commented 3 years ago

https://github.com/basebank/gophers-code-reading-party/issues/7#issuecomment-876175674

pprofのことGoCon2019 automnではっぴょうしたひとがいそう？

やっぱりorisanoパイセンだった（具体的な使い方とかはスライドからは読み取れなかった） https://speakerdeck.com/orisano/oss-performance-tuning-tips?slide=54

budougumi0617 commented 3 years ago

2021/07/08 サマリ

雑トピック

Goでデバッグどうやってやるの？

pprofの話