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Why Is Docker Performance So Slow on macOS?

Linda Hamilton

Nov 11, 2024 am 11:44 AM

Why Is Docker Performance So Slow on macOS?

Docker Performance Woes on MacOs

Docker's sluggish behavior on MacOs has been a persistent issue for users seeking to run Docker containers efficiently.

Root of the Problem

Unlike Linux, MacOs and Windows lack a native Linux kernel required for optimal Docker performance. Instead, they employ a client-based architecture with an abstraction layer separating Docker containers from the host kernel. This difference in architecture introduces a performance penalty due to filesystem incompatibilities.

Performance Implications

The impact of this architectural limitation is evident in the performance metrics of Symfony applications running on Docker within MacOs environments. A significant slowdown in execution time is observed, particularly during the initial rendering phase. Caching mechanisms implemented in Symfony and Docker provide marginal improvements but fail to match the performance achieved when running Symfony natively on MacOs without Docker.

Mitigation Techniques

While it's impossible to fully eliminate the performance overhead associated with running Docker on MacOs, certain practices can help minimize its impact. One approach involves utilizing volumes in the following manner:

volumes:
        - .:/application:cached

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