Google Developers Blog: freebsd
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By Murray Stokely, Software Engineer and FreeBSD Committer Most CPUs today have built in performance measurement counters (PMCs) that can measure interesting low-level hardware events such as cache misses, branch mispredicts, and tlb misses. FreeBSD's HWPMC(4) driver "virtualizes" these hardware counters, allowing multiple processes to use them, and for multiple hardware counters to be concurrently active. Both simple counting and sampling (profiling) are supported, along with multi-CPU operation. FreeBSD's performance measurement toolset, PmcTools , is built using HWPMC. What is the system doing at this point of time? (e.g. "What hardware events are being seen in unusual numbers?") Which part of the system are the symptoms associated with? (e.g. "Which are the 'hot' locations in the source?") know what you think !
