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### Description <!-- Describe your changes. --> Use UseMultiToolTask and limit the number of cl.exe instances running. MultiToolTask info: https://devblogs.microsoft.com/cppblog/improved-parallelism-in-msbuild/ Info on why limiting CL_MPCount can help: https://github.com/Microsoft/checkedc-clang/wiki/Parallel-builds-of-clang-on-Windows The current CIs have 4 cores (both physical and logical). Hardcoded the GPU build in win-ci.yml to use CL_MPCount of 2 as that seems to work fine. Can adjust if needed to base it on the actual number of cores or to use build.py to build. Caveat: I've run about 16 builds and haven't seen a slow build yet, but as the root cause of the slow builds isn't really known this isn't guaranteed to be a fix. ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> Try and prevent super slow GPU builds by reducing number of tasks potentially running in parallel. |
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