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SergeyKostrov
Valued Contributor II
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Minimal Averaged Delta of Intel RDTSC and RDTSCP instructions

*** Minimal Averaged Delta of Intel RDTSC and RDTSCP instructions ***
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SergeyKostrov
Valued Contributor II
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[ Abstract ] Time-Interval Measurements using TSC Intel CPU's a Time Stamp Counter ( TSC ) is a special 64-bit register that increments every clock cycle. Two instructions, RDTSC and RDTSCP, could read a value of TSC into General Purpose Registers ( GPR ). Intel doesn't provide any information on latencies of these two instructions, however througputs for both instructions are given in Intel 64 and IA-32 Architectures Optimization Reference Manual.
SergeyKostrov
Valued Contributor II
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[ List of Abbreviations ] CPU - Central Processing Unit ILP - Instruction Level Parallelism TSC - Time Stamp Counter ( number of clock cycles since the CPU is powered on ) GPR - General Purpose Registers NIL - Native Internal Latency OEL - Observed External Latency MAD - Minimal Averaged Delta ( number of clock cycles between two calls to RDTSC or RDTSCP instructions ) DOU - Degree of Uncertainty ( unknowns related to Superscalar processing with ILP ) ATV - Absolute TSC Value DTV - Difference TSC Value UTV - Uncorrected TSC Value CTV - Corrected TSC Value
SergeyKostrov
Valued Contributor II
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[ Details ] There are two point of views among Software Engineers and Computer Scientists if a latency of RDTSC or RDTSCP instructions, officially not known, need to be taken into account when dealing with a precise time measurements. Here is a list of terms that will be used: - a Native Internal Latency ( NIL ) for RDTSC and RDTSCP instructions - an Observed External Latency ( OEL ) for RDTSC and RDTSCP instructions - a Minimal Averaged Delta ( MAD ) for RDTSC and RDTSCP instructions - a Degree of Uncertainty ( DUO ) of Instruction Level Parallelism of a CPU with a superscalar architecture NIL of RDTSC or RDTSCP instructions is a minimal number of clock cycles needed to move a 64-bit value of TSC to EDX:EAX or RDX:RAX GPRs before the value becomes available for an external program. OEL is a minimal difference between two TSC values after two uninterrupted by an OS calls of RDTSC or RDTSCP instructions and calculated as follows: OEL = ( TSC2 - TSC1 ) * DOU where TSC1 = READ_TSC TSC2 = READ_TSC When DOU is set to 1.0 it is assumed that there is no Instruction Level Parallelism and instructions are executed one after another. Only positive numbers are valid for DOU and 0.0 value of DOU is excluded. DOU is a very empirical number because some instructions are designed for out-of-order execution by a CPU. MAD is a number of clock cycles it takes to execute one RDTSC or RDTSCP instruction in a series of calls to RDTSC or RDTSCP instructions. A series of calls of the same instruction needs to be executed in order to fill a CPU pipeline and to retire non RDTSC or RDTSCP instructions. MAD is calculated as follows: MAD = ( ( TSC2 - TSC1 - SAVE_TSC1_LATENCY ) / NumOfInstructionsToFillPipeline ) * DOU where TSC1 = READ_TSC TSC2 = READ_TSC SAVE_TSC1_LATENCY is a latency of MOV instruction to save EAX or RAX GPRs Note: EDX or RDX registers are Not saved to improve accuracy of measurements and it is possible that overflow of values in EAX and RAX GPRs could happen. It is a very speculative matter that a NIL of RDTSC or RDTSCP instructions is about 1-2 clock cycles for 32-bit CPUs and 64-bit CPUs. However, it is clear that Intel CPU micro-codes should read and move TSC value to GPRs as faster as possible. A set of properties of a NIL could be as follows: - NIL is always a constant for a given CPU architecture - NIL can not be estimated externally because it is not clear how many micro-ops of a CPU are needed to complete RDTSC or RDTSCP instructions - NIL can not be measured externally because it is always hidden and is a part of MAD An OEL is always higher than NIL for a given CPU and could be equal to MAD when DOU is 1.0. A series of tests implemented in C language with some portion of codes in inline assembler are completed and MAD values are calculated.
SergeyKostrov
Valued Contributor II
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[ Pseudo-code of Tests ] A pseudo-code of tests to evaluate MAD of RDTSC or RDTSCP instructions is as follows: SET_PRIORITY_TO_REALTIME TSC1 = READ_TSC SAVE_TSC1 ;; Its latency is SAVE_TSC1_LATENCY ;; Fill CPU pipeline RDTSC() ;; 1 RDTSC() ;; 2 RDTSC() ;; 3 RDTSC() ;; 4 RDTSC() ;; 5 RDTSC() ;; 6 RDTSC() ;; 7 RDTSC() ;; 8 RDTSC() ;; 9 RDTSC() ;; 10 ;; TSC2 = READ_TSC MAD = ( ( TSC2 - TSC1 - SAVE_TSC1_LATENCY ) / 10 ) * DOU SET_PRIORITY_TO_NORMAL where DOU = 1.0
SergeyKostrov
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[ Computer Systems used for evaluations ] ** Dell Precision Mobile M4700 ** Intel Core i7-3840QM ( 2.80 GHz ) Ivy Bridge / 4 cores / 8 logical CPUs / ark.intel.com/products/70846 32GB RAM 320GB HDD NVIDIA Quadro K1000M ( 192 CUDA cores / 2GB memory ) Windows 7 Professional 64-bit SP1 Size of L3 Cache = 8MB ( shared between all cores for data & instructions ) Size of L2 Cache = 1MB ( 256KB per core / shared for data & instructions ) Size of L1 Cache = 256KB ( 32KB per core for data & 32KB per core for instructions ) Display resolution: 1366 x 768 ** Dell Dimension 4400 ** Intel Pentium 4 ( 1.60 GHz / 1 core ) 1GB RAM Seagate 20GB HDD ( * ) Seagate 3TB HDD ( ** ) EVGA GeForce 6200 Video Card 512MB DDR2 AGP 8x Video Card Windows XP Professional 32-bit SP3 Size of L2 Cache = 256KB Size of L1 Cache = 8KB Display resolution: 1440 x 990 ( * ) Seagate Barracuda 20GB IDE Hard Disk Drive ST320011A 3.5" 7200 Rpm 2MB Cache IDE Ultra ATA100 / ATA-iV/6 Average Rotational Latency : 4.17 ms Average Seek Times Read : 9.0ms Average Seek Times Write : 10.0ms Maximum Internal Transfer Rate : 69.4MB/sec Average External Transfer Rate : 100MB/sec ( Read and Write ) Maximum External Transfer Rate : 150MB/sec ( Read ) Note: Barracuda ATA IV Family ( ** ) Seagate Barracuda 3TB IDE Hard Disk Drive ST3000DM001 3.5" 7200 Rpm 64MB Cache SATA III ( 6GB/sec ) Average Rotational Latency : 4.16 ms Average Seek Times Read : 8.5ms Average Seek Times Write : 9.5ms Maximum Internal Transfer Rate : 268MB/sec Average External Transfer Rate : 156MB/sec ( Read and Write ) Maximum External Transfer Rate : 210MB/sec ( Read )
SergeyKostrov
Valued Contributor II
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[ List of tests ] Four tests are completed for every CPU tested with different C++ compilers: [ Sub-Test002.01.A - RDTSC ] - pure C language [ Sub-Test002.01.B - RDTSC ] - C language with inline assembler [ Sub-Test002.01.C - RDTSCP ] - pure C language [ Sub-Test002.01.D - RDTSCP ] - C language with inline assembler
SergeyKostrov
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Four possible use cases for __rdtscp intrinsic function need to be considered. The function is declared as follows: ... extern unsigned __int64 __ICL_INTRINCC __rdtscp( unsigned int * ); ... Note: Let's denote uiTscValue as 1st value, and iRetValue as 2nd value. Use Case 1 - 1st value used / 2nd value used: ... unsigned int iRetValue = 0; unsigned __int64 uiTscValue = __rdtscp( &iRetValue ); ... C++ compiler should generate ordered MOV instructions to save 1st value and 2nd value at some addresses. Use Case 2 - 1st value used / 2nd value not used: ... unsigned __int64 uiTscValue = __rdtscp( NULL ); ... C++ compiler should not generate MOV instructions to save 2nd value at NULL address. Currently, Intel C++ compiler tries to save 2nd value to NULL address and Access Violation exception is generated. Use Case 3 - 1st value not used / 2nd value used: ... unsigned int iRetValue = 0; __rdtscp( &iRetValue ); ... C++ compiler should not generate MOV instructions to save 1st value at some address. Use Case 4 - 1st value not used / 2nd value not used: ... __rdtscp( NULL ); ... C++ compiler should not generate MOV instructions to save 1st value and 2nd value at some addresses.
SergeyKostrov
Valued Contributor II
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[ CPU: Pentium 4 - Microsoft C++ compiler - 32-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Started TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles Latency of 'MOV ecx, eax' instruction is 1 clock cycle(s) [ Sub-Test002.01.B - RDTSC ] - Completed [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
Valued Contributor II
129 Views

[ CPU: Pentium 4 - Borland C++ compiler - 32-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.40 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Not Supported [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
Valued Contributor II
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[ CPU: Pentium 4 - Intel C++ compiler - 32-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 81.20 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Started TSC Minimal Averaged Delta is 80.30 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles TSC Minimal Averaged Delta is 79.90 clock cycles Latency of 'MOV ecx, eax' instruction is 1 clock cycle(s) [ Sub-Test002.01.B - RDTSC ] - Completed [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
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[ CPU: Pentium 4 - MinGW C++ compiler - 32-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Not Supported [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
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[ CPU: Pentium 4 - Watcom C++ compiler - 32-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 80.40 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles TSC Minimal Averaged Delta is 80.00 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Not Supported [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
Valued Contributor II
129 Views

[ CPU: Ivy Bridge - Microsoft C++ compiler - 32-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 25.80 clock cycles TSC Minimal Averaged Delta is 26.20 clock cycles TSC Minimal Averaged Delta is 27.40 clock cycles TSC Minimal Averaged Delta is 28.20 clock cycles TSC Minimal Averaged Delta is 26.60 clock cycles TSC Minimal Averaged Delta is 28.20 clock cycles TSC Minimal Averaged Delta is 26.60 clock cycles TSC Minimal Averaged Delta is 28.60 clock cycles TSC Minimal Averaged Delta is 28.20 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Started TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 26.70 clock cycles TSC Minimal Averaged Delta is 26.70 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 26.70 clock cycles TSC Minimal Averaged Delta is 27.50 clock cycles TSC Minimal Averaged Delta is 26.70 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 26.70 clock cycles TSC Minimal Averaged Delta is 26.70 clock cycles Latency of 'MOV ecx, eax' instruction is 1 clock cycle(s) [ Sub-Test002.01.B - RDTSC ] - Completed [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
Valued Contributor II
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[ CPU: Ivy Bridge - Microsoft C++ compiler - 64-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 26.20 clock cycles TSC Minimal Averaged Delta is 26.20 clock cycles TSC Minimal Averaged Delta is 26.60 clock cycles TSC Minimal Averaged Delta is 26.20 clock cycles TSC Minimal Averaged Delta is 25.80 clock cycles TSC Minimal Averaged Delta is 26.20 clock cycles TSC Minimal Averaged Delta is 26.20 clock cycles TSC Minimal Averaged Delta is 26.20 clock cycles TSC Minimal Averaged Delta is 26.20 clock cycles TSC Minimal Averaged Delta is 25.80 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Not Supported [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
Valued Contributor II
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[ CPU: Ivy Bridge - Borland C++ compiler - 32-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 25.80 clock cycles TSC Minimal Averaged Delta is 28.30 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Not Supported [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
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[ CPU: Ivy Bridge - Borland C++ compiler - 64-bit ] [ Sub-Test002.01.A - RDTSC ] - Not Supported [ Sub-Test002.01.B - RDTSC ] - Not Supported [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
Valued Contributor II
129 Views

[ CPU: Ivy Bridge - Intel C++ compiler - 32-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 29.00 clock cycles TSC Minimal Averaged Delta is 25.40 clock cycles TSC Minimal Averaged Delta is 32.60 clock cycles TSC Minimal Averaged Delta is 29.60 clock cycles TSC Minimal Averaged Delta is 28.60 clock cycles TSC Minimal Averaged Delta is 26.20 clock cycles TSC Minimal Averaged Delta is 37.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 28.20 clock cycles TSC Minimal Averaged Delta is 25.80 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Started TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 26.70 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles TSC Minimal Averaged Delta is 27.10 clock cycles Latency of 'MOV ecx, eax' instruction is 1 clock cycle(s) [ Sub-Test002.01.B - RDTSC ] - Completed [ Sub-Test002.01.C - RDTSCP ] - Started TSC Minimal Averaged Delta is 33.40 clock cycles TSC Minimal Averaged Delta is 34.20 clock cycles TSC Minimal Averaged Delta is 34.20 clock cycles TSC Minimal Averaged Delta is 33.40 clock cycles TSC Minimal Averaged Delta is 33.80 clock cycles TSC Minimal Averaged Delta is 33.80 clock cycles TSC Minimal Averaged Delta is 34.20 clock cycles TSC Minimal Averaged Delta is 33.40 clock cycles TSC Minimal Averaged Delta is 34.20 clock cycles TSC Minimal Averaged Delta is 33.40 clock cycles [ Sub-Test002.01.C - RDTSCP ] - Completed [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
Valued Contributor II
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[ CPU: Ivy Bridge - Intel C++ compiler - 64-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Not Supported [ Sub-Test002.01.C - RDTSCP ] - Started TSC Minimal Averaged Delta is 33.80 clock cycles TSC Minimal Averaged Delta is 33.80 clock cycles TSC Minimal Averaged Delta is 33.80 clock cycles TSC Minimal Averaged Delta is 33.40 clock cycles TSC Minimal Averaged Delta is 33.40 clock cycles TSC Minimal Averaged Delta is 33.80 clock cycles TSC Minimal Averaged Delta is 33.80 clock cycles TSC Minimal Averaged Delta is 33.40 clock cycles TSC Minimal Averaged Delta is 33.40 clock cycles TSC Minimal Averaged Delta is 33.80 clock cycles [ Sub-Test002.01.C - RDTSCP ] - Completed [ Sub-Test002.01.D - RDTSCP ] - Started TSC Minimal Averaged Delta is 34.70 clock cycles TSC Minimal Averaged Delta is 34.70 clock cycles TSC Minimal Averaged Delta is 34.70 clock cycles TSC Minimal Averaged Delta is 34.70 clock cycles TSC Minimal Averaged Delta is 34.70 clock cycles TSC Minimal Averaged Delta is 34.70 clock cycles TSC Minimal Averaged Delta is 34.70 clock cycles TSC Minimal Averaged Delta is 34.30 clock cycles TSC Minimal Averaged Delta is 34.70 clock cycles TSC Minimal Averaged Delta is 34.30 clock cycles Latency of 'MOV rcx, rax' instruction is 1 clock cycle(s) [ Sub-Test002.01.D - RDTSCP ] - Completed
SergeyKostrov
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[ CPU: Ivy Bridge - MinGW C++ compiler - 32-bit ] [ Sub-Test002.01.A - RDTSC ] - Not Supported [ Sub-Test002.01.B - RDTSC ] - Not Supported [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
SergeyKostrov
Valued Contributor II
115 Views

[ CPU: Ivy Bridge - MinGW C++ compiler - 64-bit ] [ Sub-Test002.01.A - RDTSC ] - Started TSC Minimal Averaged Delta is 28.20 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 27.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles TSC Minimal Averaged Delta is 25.00 clock cycles [ Sub-Test002.01.A - RDTSC ] - Completed [ Sub-Test002.01.B - RDTSC ] - Not Supported [ Sub-Test002.01.C - RDTSCP ] - Not Supported [ Sub-Test002.01.D - RDTSCP ] - Not Supported
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