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diff --git a/GPUWATTCH_README b/GPUWATTCH_README deleted file mode 100644 index a122baa..0000000 --- a/GPUWATTCH_README +++ /dev/null @@ -1,163 +0,0 @@ -// A Beta README file to allow folks to use GPUWattch - - -1. INTRODUCTION: - -General-purpose GPU architectures are becoming increasingly prevalent in -mainstream computing, and as such they require judicious optimization for -energy efficiency. To enable such research, we propose a new GPU power model -that offers flexibility, adaptability, and stability. Flexibility is achieved -by using a bottom-up methodology and abstracting parameters from the -microarchitectural components as model inputs. Adaptability ensures that both -program and microarchitectural level interactions are captured during -execution, thereby enabling new power-management techniques specifically -targeted at GPUs. Stability is examined by validating the power model against -measurements of two commercial GPUs comprehensively through the leakage power, -average dynamic power, and dynamic power trace. The measured error is within -9.7% and 13.6% across our evaluated benchmark suite for the two target GPUs -(GTX 480 and Quadro FX 5600 respectively) and the model accurately tracks the -relative power consumption trend over time. - -The power model modifies and extends the McPAT CPU power model simulator to -model the power of contemporary GPGPUs and drive the modified McPAT version -with a cycle-accurate simulator, GPGPU-Sim. - -2. Using the Power Model -2.1 Compiling the Power Model - -By default, GPGPU-Sim bypasses the McPAT compilation. Hence, it is not -necessary to install our modified McPAT along with GPGPU-Sim. However, if the -power model is required, our modified version of McPAT will be compiled -alongside GPGPU-Sim into libcudart.so. - -The location of McPAT is specified by the GPGPUSIM_POWER_MODEL environment -variable and is used in GPGPU-Sim's Makefile to compile McPAT. This can either -be set manually or automatically set by the setup_evironment.sh file in -<GPGPU-Sim>/distribution if McPAT is found in the default directory -(<GPGPU-Sim>/mcpat/). - -2.2. Configuration Options - -This sections lists the most relevant configuration options either to describe -model a specific architecture, model a certain improvement, or to produce extra -data from the simulation. Some of these configurations are set in the GPGPU-Sim -config files and others will be set in the McPAT XML configuration files. -GPGPU-Sim configurations mainly force specific changes to the performance -modeling itself or the output format of data, while McPAT configurations mainly -determine specific parameters for the different architectural components that -are reflected in the power modeling of these components. Here, we metion only -GPGPUsim cofigurations: - -1- power_simulation_enabled: Enablle the power model simulator; if enabled, an -output file is genarated to include the detailed Power coefficients for the -simulated configuration and the Average/Maximum/Minimum total power breakdowns -for each kernel. - -2- mcpat_xml_file: The McPAT XML configuration file name; by default it is -mcpat.xml. - -3- gpu_stat_sample_frequency: Determines the sampling frequency used in the -power calculations, the performance counters are reset before each samples and -accumulated during the sampling period, and finaly passed to the power model -(McPAT) at the end of each sample. - -4- power_trace_enabled: If enabled, it produces two output files that details -the power breakdown values, and the accumulative performance counters values -for each sample. - -5- power_per_cycle_dump: Dump detailed power data each sample - -6- steady_power_levels_enabled: If enabled, it tracks the steady state -power level throughout the execution and report the start/end values with the -average power recorded for each componenet. The steady state is determined by -(-steady_state_definition) option. - -7- steady_state_definition: Takes two values. First value detemines the allowed -deviation within the steady state and the second value determines minimum -number of samples required to assume this is a steady state power level. - - -3. Understanding Simulation Output - -In this section, we detail the fromat of the power simulator output. By -default, if the power simulation is enabled at least one output file that -reports the average/maximum/minimum power values for each kernel is produced. -More outputs can be enabled if the corresponding configurations is enabled. - - -1- gpgpusim_power_report_(date&time).log- Requires (-power_simulation_enabled -1): Includes the detailed power coefficients for this configuration and the -Average/Maximum/Minimum total power and their breakdowns for the different -components for each kernel - -2- gpgpusim_power_trace_(date&time).log.gz- Requires (-power_trace_enabled 1): -A compressed file that has a detailed average power breakdown trace in a comma -separated format - -3- gpgpusim_metric_trace_(date&time).log.gz- Requires (-power_trace_enabled 1): -A compressed file that has a detailed performance counters trace in a comma -separated format - -4- gpgpusim_steady_state_tracking_report_(date&time).log.gz- Requires -(-steady_power_levels_enabled 1): It rports the steady state power level -throughout the execution with the start/end values of each interval and the -average power recorded for each componenet during this interval in a comma -separated format - - - -5. Software Design of the Power Model - -This section presents the software design of the power model. - -5.1. File list and brief description - -In this section, we briefly describe the files that were added to interface -GPGPU-Sim with McPAT. - - -1- power_stat.cc/h @ <GPGPU_SIM>/distribution/src/gpgpu-sim/: These files -contain the main structures used for recording GPGPU-Sim performance counters: -power_core_stat_t (for all core related counters) and power_mem_stat_t (for all -memory related counters), which are contained in the wrapper power_stat_t -object. The core and mem stat structures contain multiple counter pointer -arrays with 2 locations per counter (e.g. unsigned *m_counter[2]): [0] -> -pointer to counter with the current value, [1] -> previous sampled value. The -difference, [0]-[1], is used to get the per-sample estimated power in McPAT. - -2- gpgpu_sim_wrapper.cc/h @ <GPGPU_SIM>/mcpat/: These files contain the -gpgpu_sim_wrapper class that contains all of the McPAT structures (such as -Processor, ParseXML, etc), manages the power output files, and passes the -GPGPU-Sim performance counters (described in power_stat.cc/h (1)) into McPAT. -The gpgpu_sim_wrapper structure is used in power_interface.cc/h (3) to separate -the McPAT structures and interface from GPGPU-Sim. - -3- power_interface.cc/h @ <GPGPU_SIM>/distribution/src/gpgpu-sim/: These files -are used to interface GPGPU-Sim with McPAT via two main functions: init_mcpat() -and mcpat_cycle(). init_mcpat() is called from gpgpu_sim::init() in gpu-sim.cc -and through the gpgpu_sim_wrapper object, initializes all of the power related -structures in GPGPU-Sim and McPAT. Similarly, mcpat_cycle() is called from -gpgpu_sim::cycle() in gpu-sim.cc, which passes all of the performance counters -to McPAT (through the gpgpu_sim_wrapper object). - -4- gpgpu_sim.verify @ <GPGPU_SIM>/mcpat/: This file is distributed with our -modified version of McPAT to ensure the correct McPAT version is used with -GPGPU-Sim - - - - - - - - - - - - - - - - - - |