lestrrat

Tips On How To Look Good In A YAPC::Asia Photo

ref http://yapcasia.org/2014/photos

• PCばかり見るのはやめましょう。
• 画面ばかり見上げるのはやめましょう。
• 良い笑顔を見せましょう。
• 身振り手振りを時折入れましょう
• もし視界にカメラマンの人が見えたら、あちこち歩き回るのは一瞬やめてバックパネルの前に陣取りましょう
• もし視界にカメラマンの人が見えたら、そちらの方向に体を向けてあげましょう

lestrrat

RFC: Omnidep

Install mode

• Fetch from git repository
• Satisfy deps by reading tbd.json (git repo + SHA1/commit-ish) and recursively run install
• Run hooks (e.g. perl Makefile.PL)
• Optionally, run tests

Packaging mode

lestrrat

140725 09:41:39 ha_queue: /usr/local/src/mysql-5.6.19/storage/q4m/src/ha_queue.cc:2008: starting table compaction: ./XXXXXXX/queue_XXXXXXXX (begin: 491349793, end: 491349793, rows: 18446744073709551613)
140725 09:41:40 ha_queue: /usr/local/src/mysql-5.6.19/storage/q4m/src/ha_queue.cc:2134: finished table compaction: ./XXXXXXX/queue_XXXXXXXX (begin: 4096, end: 4096, rows: 0)
mysqld: /usr/local/src/mysql-5.6.19/storage/q4m/src/dllist.h:38: T* dllist<T, Cnt>::detach(T*&, size_t) [with T = queue_connection_t, long unsigned int Cnt = 1ul]: Assertion `_prev[idx] != __null' failed.
2014-07-25 09:41:40 4645 [ERROR] Got error 145 when reading table './XXXXXXX/queue_XXXXXXXX'
00:41:40 UTC - mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help
diagnose the prob

lestrrat

shoebill% go test -v .
=== RUN Test_appliance
--- PASS: Test_appliance (0.00 seconds)
=== RUN Test_blank
--- PASS: Test_blank (0.00 seconds)
=== RUN Test_crawler_google
--- PASS: Test_crawler_google (0.00 seconds)
=== RUN Test_crawler_nonmajor
--- PASS: Test_crawler_nonmajor (0.00 seconds)
=== RUN Test_crawler

lestrrat

struct passwd {
        char    *pw_name;               /* user name */
        char    *pw_passwd;             /* encrypted password */
        uid_t   pw_uid;                 /* user uid */
        gid_t   pw_gid;                 /* user gid */
        __darwin_time_t pw_change;              /* password change time */
        char    *pw_class;              /* user access class */
        char    *pw_gecos;              /* Honeywell login info */
        char    *pw_dir;                /* home directory */
        char    *pw_shell;              /* default shell */

lestrrat

# DockerでCPANインストール祭りを繰り返してたらいい加減cpanmとかに並列処理が欲しくなってきた。
# で、とりあえずgoでラッパーを作って、
# 1) 先にMETA.yamlを読み込み、依存関係を解析
# 2) キューに突っ込んで goroutineでそれぞれcpanmを起動してインストール
# という簡単な処理をしてみてどういう差が出るかやってみた
#
# 試すには go install github.com/lestrrat/go-cpan-maybe-faster/cli/go-cpan
# https://github.com/lestrrat/go-cpan-maybe-faster

$ time go-cpan --notest --local-lib-contained=local Moose

lestrrat

I disabled stat() on the cache file if the same file has been stat within the last second, and voila, go-xslate is FASTER!

# p5-xslate (cache DISABLED)
iter (10)
* Elapsed: 0.058350 seconds
* Secs per iter: 0.005835 secs/iter
* Iter per sec: 171.379606 iter/sec
iter (100)
* Elapsed: 0.132784 seconds
* Secs per iter: 0.001328 secs/iter

lestrrat

(pprof) top10
Total: 665 samples
     417  62.7%  62.7%      425  63.9% syscall.Syscall
      26   3.9%  66.6%       59   8.9% runtime.mallocgc
      16   2.4%  69.0%       32   4.8% syscall.ByteSliceFromString
      15   2.3%  71.3%       15   2.3% etext
      15   2.3%  73.5%       15   2.3% scanblock
      10   1.5%  75.0%       10   1.5% sweepspan
       7   1.1%  76.1%        7   1.1% runtime.markallocated
       6   0.9%  77.0%      110  16.5% github.com/lestrrat/go-xslate/loader.(*CachedByteCodeLoader).Load

lestrrat

# p5-xslate (cache DISABLED)
iter (10)
* Elapsed: 0.058262 seconds
* Secs per iter: 0.005826 secs/iter
* Iter per sec: 171.638461 iter/sec
iter (100)
* Elapsed: 0.122816 seconds
* Secs per iter: 0.001228 secs/iter
* Iter per sec: 814.226159 iter/sec
iter (1000)

lestrrat

# p5-xslate (cache DISABLED)
iter (10)
* Elapsed: 0.077450 seconds
* Secs per iter: 0.007745 secs/iter
* Iter per sec: 129.115558 iter/sec
iter (100)
* Elapsed: 0.175402 seconds
* Secs per iter: 0.001754 secs/iter
* Iter per sec: 570.118927 iter/sec
iter (1000)