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sigdump

(★ 192)

Use signal to show stacktrace of a Ruby process without restarting it

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# Installation Guide

1. Get the code

git clone https://github.com/fluent/sigdump

Downloads the entire project code from GitHub to your computer.

cd sigdump

Moves into the project folder you just downloaded.

2. Ruby

Easy Recommended

Prerequisites

Git Needed to download the project code from GitHub.
Ruby Ruby is required to use the bundle command.

/srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:32:in `dump_backtrace'

Type this command into your terminal and run it.

/srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:19:in `block in dump_all_thread_backtrace'

Type this command into your terminal and run it.

/srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:18:in `each'

Type this command into your terminal and run it.

/srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:18:in `dump_all_thread_backtrace'

Type this command into your terminal and run it.

/srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:9:in `block (2 levels) in install_thread_dump_handler'

Type this command into your terminal and run it.

✅ If bundle install finishes without errors, continue with the run command from the README (e.g. rails server).

Pulled directly from this repo's README.

// repository documentation

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# sigdump

In short: *SIGQUIT of Java VM for Ruby.*

Server applications (like Rails apps) cause performance problems, deadlock or memory swapping from time to time. But it's difficult to reproduce such kind of problems. `sigdump` makes it possible to get information from a running process without restarting. Just sending `SIGCONT` signal will dump backtrace and memory profile to `/tmp/sigdump-<pid>.log` file.

`sigdump` dumps following information (see also [Sample output](#sample-outout)):

* Backtrace of all threads
* Number of allocated objects per class
* GC profiler reports if GC profiler is enabled (`GC::Profiler.enable` is called)
* Stacktrace of Java threads for each Ruby threads if the runtime is JRuby

## Install

Just install `sigdump` gem and add `require 'sigdump/setup'` line to your code. Or you can use Bundler as following:

```ruby
# Gemfile
gem 'sigdump', require: 'sigdump/setup'
```

Note for [Resque](https://github.com/resque/resque):

You need to change the default signal (`SIGCONT`) because Rescue traps `SIGCONT` and it conflicts with sigdump.
To change the signal, set name of a signal to `SIGDUMP_SIGNAL` environment variable. For Rails, you can add following lines to `environment.rb` file:

```ruby
# setup sigdump: https://github.com/frsyuki/sigdump
ENV['SIGDUMP_SIGNAL'] = 'TSTP'
require 'sigdump/setup'
```

## Usage

Send `SIGCONT` signal to the Ruby process. It dumps backtrace and memory profile to `/tmp/sigdump-<pid>.log` file.

```shell
$ kill -CONT <pid>
$ cat /tmp/sigdump-<pid>.log
```

Set `SIGDUMP_SIGNAL` environment variable to change the signal (default: SIGCONT).

Set `SIGDUMP_PATH` environment variable to change the output path (default: /tmp/sigdump-\<pid\>.log). You can set "-" here to dump to STDOUT, or "+" to STDERR.

## Sample outout

$ cat /tmp/sigdump-9218.log
    Sigdump at 2013-04-24 16:57:12 +0000 process 9218 (unicorn worker[3] -E staging -c /etc/unicorn/staging.rb -E staging)
      Thread #<Thread:0x00000001424518> status=run priority=0
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:32:in `dump_backtrace'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:19:in `block in dump_all_thread_backtrace'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:18:in `each'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:18:in `dump_all_thread_backtrace'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:9:in `block (2 levels) in install_thread_dump_handler'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:91:in `open'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:91:in `_open_dump_path'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/sigdump-0.1.0/lib/sigdump.rb:7:in `block in install_thread_dump_handler'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:626:in `call'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:626:in `select'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:626:in `worker_loop'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:487:in `spawn_missing_workers'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:137:in `start'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/bin/unicorn:121:in `<top (required)>'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/bin/unicorn:23:in `load'
          /srv/staging/current/vendor/bundle/ruby/1.9.1/bin/unicorn:23:in `<main>'
      GC stat:
          count: 34
          heap_allocated_pages: 1366
          heap_sorted_length: 1368
          heap_allocatable_pages: 0
          heap_available_slots: 556777
          heap_live_slots: 551708
          heap_free_slots: 5069
          heap_final_slots: 0
          heap_marked_slots: 363350
          heap_swept_slots: 58807
          heap_eden_pages: 1366
          heap_tomb_pages: 0
          total_allocated_pages: 1367
          total_freed_pages: 1
          total_allocated_objects: 2438499
          total_freed_objects: 1886791
          malloc_increase_bytes: 650416
          malloc_increase_bytes_limit: 16777216
          minor_gc_count: 25
          major_gc_count: 9
          remembered_wb_unprotected_objects: 5122
          remembered_wb_unprotected_objects_limit: 5222
          old_objects: 348964
      Built-in objects:
       367,492: TOTAL
       208,193: T_STRING
        61,817: T_ARRAY
        37,343: T_DATA
        28,293: T_NODE
        10,678: T_OBJECT
         6,385: T_HASH
         5,957: T_CLASS
         2,300: T_ICLASS
         2,184: T_REGEXP
         1,547: T_MODULE
           900: T_FLOAT
           677: T_STRUCT
           497: T_BIGNUM
           432: T_MATCH
           251: T_RATIONAL
            29: T_FILE
             8: FREE
             1: T_COMPLEX
      All objects:
       207,335: String
        32,987: Array
        28,665: RubyVM::InstructionSequence
         5,863: Hash
         3,759: RubyVM::Env
         3,680: Proc
         2,338: Class
         2,184: Regexp
         1,632: MIME::Type
         1,547: Module
         1,040: Gem::Version
           982: Gem::Requirement
           945: Float
           920: Journey::Nodes::Cat
           804: Time
           660: Gem::Dependency
           497: Bignum
      ...
      String 7,556,137 bytes
       Array 821 elements
        Hash 90 pairs