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2019-01-24perfmon plugin: 2-way parallel stat collectionDave Barach1-21/+41
As a FUD reduction measure, this patch implements 2-way parallel counter collection. Synthetic stat component counter pairs run at the same time. Running two counters (of any kind) at the same time naturally reduces the aggregate time required by an approximate factor-of-2, depending on whether an even or odd number of stats have been requested. I don't completely buy the argument that computing synthetic stats such as instructions-per-clock will be inaccurate if component counter values are collected sequentially. Given uniform traffic pattern, it must make no difference. As the collection interval increases, the difference between serial and parallel component counter collection will approach zero, see also the Central Limit theorem. Change-Id: I36ebdcf125e8882cca8a1929ec58f17fba1ad8f1 Signed-off-by: Dave Barach <dave@barachs.net>
2018-12-17Improve perfmon json table pickerDave Barach1-22/+90
Built a tool to chew up https://download.01.org/perfmon/mapfile.csv, and output a table in this format: typedef struct { u8 model; u8 stepping; u8 has_stepping; char *filename; } file_by_model_and_stepping_t; static const file_by_model_and_stepping_t fms_table [] = { /* model, stepping, stepping valid, file */ { 0x2E, 0x0, 0, "NehalemEX_core_V2.json" }, { 0x1E, 0x0, 0, "NehalemEP_core_V2.json" }, <snip> { 0x55, 0x5, 1, "cascadelakex_core_v1.00.json" }, { 0x55, 0x6, 1, "cascadelakex_core_v1.00.json" }, { 0x55, 0x7, 1, "cascadelakex_core_v1.00.json" }, <snip> Change-Id: Ie0e8a7e851799e9d060b966047745039c066ec7b Signed-off-by: Dave Barach <dave@barachs.net>
2018-10-23perfmon.c: Register additional cpuids.Paul Vinciguerra1-4/+7
Added/tested additional cpuids from our testbed. Change-Id: Ifd3ea9e8e8231a8901966903bf5eceb635b82482 Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
2018-10-22X86_64 perf counter pluginDave Barach1-0/+615
Change-Id: Ie5a00c15ee9536cc61afab57f6cadc1aa1972f3c Signed-off-by: Dave Barach <dave@barachs.net>