March 2019
Intermediate to advanced
394 pages
11h 4m
English
Content preview from Mastering MongoDB 4.x - Second Edition
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WiredTiger performance strategies
As discussed earlier in this chapter, WiredTiger uses an internal cache to optimize performance. On top of it, there is always the filesystem cache that the operating system (and MMAPv1) uses to fetch data from disk.
By default, we have 50% of RAM dedicated to the filesystem cache and 50% to the WiredTiger internal cache.
The filesystem cache will keep data compressed as it is stored on disk. The internal cache will decompress it as follows:
- Strategy 1: Allocate 80% or more to the internal cache. This has the goal of fitting our working set in WiredTiger's internal cache.
- Strategy 2: Allocate 80% or more to the filesystem cache. Our goal here is to avoid using the internal cache as much as possible, and ...
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