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devilutionX/Packaging/OpenDingux/rg99-pgo.md

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RG99 profile-guided optimization

The RG99 build must be PGO'd for reasonable performance.

Here are the instructions for producing a PGO'd build.

  1. Install https://github.com/diasurgical/devilutionx-mpq-tools

  2. Build the OPK for profiling data collection:

    TOOLCHAIN=/opt/rs90-toolchain Packaging/OpenDingux/build.sh rg99 --profile-generate

  3. Copy the OPK to RG99 (rg99 is 10.1.1.3):

    scp -O build-rg99/devilutionx-rg99.opk rg99:/media/sdcard/apps

  4. Now, run the OPK. It will run the timedemo instead of the actual game and will take about 1 hour (due to heavy swapping).

  5. Copy the profiling data from RG99:

    rm -rf /tmp/devilutionx-profile
scp -r -O rg99:/media/data/local/home/devilutionx-profile /tmp/devilutionx-profile

  6. Build the OPK use the collected profiling data:

    TOOLCHAIN=/opt/rs90-toolchain Packaging/OpenDingux/build.sh rg99 --profile-use --profile-dir /tmp/devilutionx-profile

  7. The final package is at build-rg99/devilutionx-rg99.opk.