{"id":246,"date":"2023-07-28T15:41:47","date_gmt":"2023-07-28T07:41:47","guid":{"rendered":"https:\/\/boostup.cf\/?p=246"},"modified":"2023-07-28T20:38:33","modified_gmt":"2023-07-28T12:38:33","slug":"vtune","status":"publish","type":"post","link":"https:\/\/189505.xyz\/?p=246","title":{"rendered":"vtune"},"content":{"rendered":"

\nmemory access
\n<\/h1>\n
\n# \/opt\/intel\/oneapi\/vtune\/latest\/bin64\/vtune -help collect memory-access\nIntel(R) VTune(TM) Profiler Command Line Tool\nCopyright (C) 2009-2021 Intel Corporation. All rights reserved.\n\n Measure a set of metrics to identify memory access related issues (for\n example, specific for NUMA architectures). This analysis type is based on\n the hardware event-based sampling collection.\n\n To modify the analysis type, use the configuration options (knobs) as\n follows:\n -collect memory-access -knob =\n Multiple -knob options are allowed and can be followed by additional collect\n action options, as well as global options, if needed.\n\nsampling-interval\n\n  Specify an interval (in milliseconds) between CPU samples.\n\n  Default value: 5\n  Possible values: numbers between 0.01 and 1000\n\nanalyze-mem-objects\n\n  Enable the instrumentation of dynamic memory allocation\/de-allocation and\n  map hardware events to such memory objects. This option may cause\n  additional runtime overhead due to the instrumentation of all system memory\n  allocation\/de-allocation API.\n\n  Default value: false\n  Possible values: true false\n\nmem-object-size-min-thres\n\n  Specify a minimal size of dynamic memory allocations to analyze. This\n  option helps reduce runtime overhead of the instrumentation.\n\n  Default value: 1024\n  Possible values: numbers between -2147483648 and 2147483647\n\ndram-bandwidth-limits\n\n  Evaluate maximum achievable local DRAM bandwidth before the collection\n  starts. This data is used to scale bandwidth metrics on the timeline and\n  calculate thresholds.\n\n  Default value: true\n  Possible values: true false\n\nanalyze-openmp\n\n  Instrument and analyze OpenMP regions to detect inefficiencies such as\n  imbalance, lock contention, or overhead on performing scheduling, reduction\n  and atomic operations.\n\n  Default value: false\n  Possible values: true false\n\n  \/\/ example\n-knob sampling-interval=5  -knob analyze-mem-objects=true\n\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
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