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https://github.com/ClusterCockpit/cc-metric-collector.git
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37 lines
1.6 KiB
Plaintext
37 lines
1.6 KiB
Plaintext
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SHORT L2 cache bandwidth in MBytes/s
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EVENTSET
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FIXC0 INSTR_RETIRED_ANY
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FIXC1 CPU_CLK_UNHALTED_CORE
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FIXC2 CPU_CLK_UNHALTED_REF
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PMC0 L2_REQUESTS_REFERENCE
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PMC1:MATCH0=0x0002:MATCH1=0x1 OFFCORE_RESPONSE_0_OPTIONS
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METRICS
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Runtime (RDTSC) [s] time
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Runtime unhalted [s] FIXC1*inverseClock
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Clock [MHz] 1.E-06*(FIXC1/FIXC2)/inverseClock
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CPI FIXC1/FIXC0
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L2 non-RFO bandwidth [MBytes/s] 1.E-06*(PMC0)*64.0/time
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L2 non-RFO data volume [GByte] 1.E-09*PMC0*64.0
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L2 RFO bandwidth [MBytes/s] 1.E-06*(PMC1)*64.0/time
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L2 RFO data volume [GByte] 1.E-09*(PMC1)*64.0
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L2 bandwidth [MBytes/s] 1.E-06*(PMC0+PMC1)*64.0/time
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L2 data volume [GByte] 1.E-09*(PMC0+PMC1)*64.0
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LONG
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Formulas:
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L2 non-RFO bandwidth [MBytes/s] = 1.E-06*L2_REQUESTS_REFERENCE*64.0/time
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L2 non-RFO data volume [GByte] = 1.E-09*L2_REQUESTS_REFERENCE*64.0
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L2 RFO bandwidth [MBytes/s] = 1.E-06*(OFFCORE_RESPONSE_0_OPTIONS:MATCH0=0x0002:MATCH1=0x1)*64.0/time
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L2 RFO data volume [GByte] = 1.E-09*(OFFCORE_RESPONSE_0_OPTIONS:MATCH0=0x0002:MATCH1=0x1)*64.0
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L2 bandwidth [MBytes/s] = 1.E-06*(L2_REQUESTS_REFERENCE+OFFCORE_RESPONSE_0_OPTIONS:MATCH0=0x0002:MATCH1=0x1)*64.0/time
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L2 data volume [GByte] = 1.E-09*(L2_REQUESTS_REFERENCE+OFFCORE_RESPONSE_0_OPTIONS:MATCH0=0x0002:MATCH1=0x1)*64.0
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--
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The L2 bandwidth and data volume does not contain RFOs (also called
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write-allocates). The RFO bandwidth and data volume is only accurate when all
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used data fits in the L2 cache. As soon as the data exceeds the L2 cache size,
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the RFO metrics are too high.
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Moreover, with increasing count of measured cores, the non-RFO metrics overcount
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but commonly stay withing 10% error.
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