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Lorenz Huedepohl authored
There is currently no reliable way to measure RAM accesses with PAPI, the previous way by counting load and store instructions is not very useful, as it is unknown how many bytes are transferred in each instruction. On certain CPUs there is a reliable way to measure this via an "uncore" performance counter, one can check if your CPU (and/or Linux kernel version) support this by checking if the files /sys/devices/uncore_imc/events/data_reads /sys/devices/uncore_imc/events/data_writes exist. To access these counter from an unprivileged program one has to set the "paranoia" level of the perf subsystem to at most 0, adjustable via the file /proc/sys/kernel/perf_event_paranoid Along with this change there is a small API/ABI breakage as some keyword arguments related to the memory measurement have been renamed/split-up.
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