How we’ve remade sys threads in Manticore Search

Posted on by Alexey Vinogradov

Recently we’ve remade our system threads. Since we’ve forked from Sphinx and earlier searchd had all system tasks made in an often-rise-up style. Each service worked in a dedicated thread which wakes up every 50ms and checks whether it has something to do or not. That means that even an idle daemon wakes 200 times a sec ‘just to check’ a task. Having 6 such tasks will make 1200 wakes a sec, and it became noticeable especially by clients on Amazon AWS which counts CPU usage. Those internal tasks were: […]

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There are often optimizations that can be made to a Sphinx / Manticore setup by changing some simple directives in the configuration or making quick changes to an index definition.

Some common mistakes and issues can include:

  • doing main+delta without kill-lists, even if the delta does include updated records found in the main
  • using wildcarding with very short prefix/infix which can hammer performance in some cases
  • disabled (unintentional) seamless rotates and getting stalls on index rotations
  • adding texts as string attributes even if they are not using for any kind of operation (filtering, grouping, sorting) or mandatory to be present in results
  • using deprecated settings 

Having a quick look on the configuration can show issues or potential issues, this is why we want to offer a gift to our growing community!

When uploading your configuration file, we recommend to remove any database credentials first.

We suggest also you give as many possible details about your setup: how big is the data you have, how typical queries look and what issues you experience.

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