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Decrease default concurrency, fixes #3892

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More threads means more memory usage AND increased glibc memory bloat due to arena contention.  Remember to set MALLOC_ARENA_MAX=2 to minimize your bloat.

You can get the old concurrency by adding `-c 25` to your Sidekiq command line.
This commit is contained in:
Mike Perham 2018-07-20 10:54:31 -07:00
parent e4b7b911f6
commit 8ff96ae0b0
2 changed files with 2 additions and 1 deletions
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Changes.md
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@ -5,6 +5,7 @@
HEAD HEAD
----------- -----------
- **Decrease default concurrency from 25 to 10** [#3892]
- Smoother scheduling for large Sidekiq clusters [#3889] - Smoother scheduling for large Sidekiq clusters [#3889]
- Switch Sidekiq::Testing impl from alias\_method to Module#prepend, for resiliency [#3852] - Switch Sidekiq::Testing impl from alias\_method to Module#prepend, for resiliency [#3852]
- Update Sidekiq APIs to use SCAN for scalability [#3848, ffiller] - Update Sidekiq APIs to use SCAN for scalability [#3848, ffiller]

2
lib/sidekiq.rb
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@ -17,7 +17,7 @@ module Sidekiq
DEFAULTS = { DEFAULTS = {
queues: [], queues: [],
labels: [], labels: [],
concurrency: 25, concurrency: 10,
require: '.', require: '.',
environment: nil, environment: nil,
timeout: 8, timeout: 8,