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perf: resolve review comments
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> Framework for linux performance counter measurements.
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- Gather basic performance counter stats for a command:
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- Display basic performance counter stats for a command `gcc -c -O3 hello.c`:
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`perf stat {{command}}`
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`perf stat {{gcc -c -O3 hello.c}}`
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- Display system-wide real time performance counter profile:
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`sudo perf top`
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- Run a command and record its profile into perf.data:
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- Run a command and record its profile into "perf.data":
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`sudo perf record {{command}}`
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- Read perf.data (created by perf record) and display the profile:
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- Read "perf.data" (created by `perf record`) and display the profile:
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`sudo perf report`
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