gem5/ext/mcpat/cacti/crossbar.cc

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/*****************************************************************************
* McPAT/CACTI
* SOFTWARE LICENSE AGREEMENT
* Copyright 2012 Hewlett-Packard Development Company, L.P.
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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* Copyright (c) 2010-2013 Advanced Micro Devices, Inc.
* All Rights Reserved
*
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* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
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* neither the name of the copyright holders nor the names of its
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ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
***************************************************************************/
#include "crossbar.h"
#define ASPECT_THRESHOLD .8
#define ADJ 1
Crossbar::Crossbar(
double n_inp_,
double n_out_,
double flit_size_,
TechnologyParameter::DeviceType *dt
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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): n_inp(n_inp_), n_out(n_out_), flit_size(flit_size_), deviceType(dt) {
min_w_pmos = deviceType->n_to_p_eff_curr_drv_ratio * g_tp.min_w_nmos_;
Vdd = dt->Vdd;
CB_ADJ = 1;
}
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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Crossbar::~Crossbar() {}
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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double Crossbar::output_buffer() {
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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//Wire winit(4, 4);
double l_eff = n_inp * flit_size * g_tp.wire_outside_mat.pitch;
Wire w1(g_ip->wt, l_eff);
//double s1 = w1.repeater_size *l_eff*ADJ/w1.repeater_spacing;
double s1 = w1.repeater_size * (l_eff < w1.repeater_spacing ?
l_eff * ADJ / w1.repeater_spacing : ADJ);
double pton_size = deviceType->n_to_p_eff_curr_drv_ratio;
// the model assumes input capacitance of the wire driver = input capacitance of nand + nor = input cap of the driver transistor
TriS1 = s1 * (1 + pton_size) / (2 + pton_size + 1 + 2 * pton_size);
TriS2 = s1; //driver transistor
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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if (TriS1 < 1)
TriS1 = 1;
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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double input_cap = gate_C(TriS1 * (2 * min_w_pmos + g_tp.min_w_nmos_), 0) +
gate_C(TriS1 * (min_w_pmos + 2 * g_tp.min_w_nmos_), 0);
// input_cap += drain_C_(TriS1*g_tp.min_w_nmos_, NCH, 1, 1, g_tp.cell_h_def) +
// drain_C_(TriS1*min_w_pmos, PCH, 1, 1, g_tp.cell_h_def)*2 +
// gate_C(TriS2*g_tp.min_w_nmos_, 0)+
// drain_C_(TriS1*min_w_pmos, NCH, 1, 1, g_tp.cell_h_def)*2 +
// drain_C_(TriS1*min_w_pmos, PCH, 1, 1, g_tp.cell_h_def) +
// gate_C(TriS2*min_w_pmos, 0);
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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tri_int_cap = drain_C_(TriS1 * g_tp.min_w_nmos_, NCH, 1, 1, g_tp.cell_h_def) +
drain_C_(TriS1 * min_w_pmos, PCH, 1, 1, g_tp.cell_h_def) * 2 +
gate_C(TriS2 * g_tp.min_w_nmos_, 0) +
drain_C_(TriS1 * min_w_pmos, NCH, 1, 1, g_tp.cell_h_def) * 2 +
drain_C_(TriS1 * min_w_pmos, PCH, 1, 1, g_tp.cell_h_def) +
gate_C(TriS2 * min_w_pmos, 0);
double output_cap = drain_C_(TriS2 * g_tp.min_w_nmos_, NCH, 1, 1,
g_tp.cell_h_def) +
drain_C_(TriS2 * min_w_pmos, PCH, 1, 1, g_tp.cell_h_def);
double ctr_cap = gate_C(TriS2 * (min_w_pmos + g_tp.min_w_nmos_), 0);
tri_inp_cap = input_cap;
tri_out_cap = output_cap;
tri_ctr_cap = ctr_cap;
return input_cap + output_cap + ctr_cap;
}
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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void Crossbar::compute_power() {
Wire winit(4, 4);
double tri_cap = output_buffer();
assert(tri_cap > 0);
//area of a tristate logic
double g_area = compute_gate_area(INV, 1, TriS2 * g_tp.min_w_nmos_,
TriS2 * min_w_pmos, g_tp.cell_h_def);
g_area *= 2; // to model area of output transistors
g_area += compute_gate_area (NAND, 2, TriS1 * 2 * g_tp.min_w_nmos_,
TriS1 * min_w_pmos, g_tp.cell_h_def);
g_area += compute_gate_area (NOR, 2, TriS1 * g_tp.min_w_nmos_,
TriS1 * 2 * min_w_pmos, g_tp.cell_h_def);
double width /*per tristate*/ = g_area / (CB_ADJ * g_tp.cell_h_def);
// effective no. of tristate buffers that need to be laid side by side
int ntri = (int)ceil(g_tp.cell_h_def / (g_tp.wire_outside_mat.pitch));
double wire_len = MAX(width * ntri * n_out,
flit_size * g_tp.wire_outside_mat.pitch * n_out);
Wire w1(g_ip->wt, wire_len);
area.w = wire_len;
area.h = g_tp.wire_outside_mat.pitch * n_inp * flit_size * CB_ADJ;
Wire w2(g_ip->wt, area.h);
double aspect_ratio_cb = (area.h / area.w) * (n_out / n_inp);
if (aspect_ratio_cb > 1) aspect_ratio_cb = 1 / aspect_ratio_cb;
if (aspect_ratio_cb < ASPECT_THRESHOLD) {
if (n_out > 2 && n_inp > 2) {
CB_ADJ += 0.2;
//cout << "CB ADJ " << CB_ADJ << endl;
if (CB_ADJ < 4) {
this->compute_power();
}
}
}
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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power.readOp.dynamic =
(w1.power.readOp.dynamic + w2.power.readOp.dynamic +
(tri_inp_cap * n_out + tri_out_cap * n_inp + tri_ctr_cap +
tri_int_cap) * Vdd * Vdd) * flit_size;
power.readOp.leakage = n_inp * n_out * flit_size * (
cmos_Isub_leakage(g_tp.min_w_nmos_ * TriS2 * 2, min_w_pmos * TriS2 * 2,
1, inv) * Vdd +
cmos_Isub_leakage(g_tp.min_w_nmos_ * TriS1 * 3, min_w_pmos * TriS1 * 3,
2, nand) * Vdd +
cmos_Isub_leakage(g_tp.min_w_nmos_ * TriS1 * 3, min_w_pmos * TriS1 * 3,
2, nor) * Vdd +
w1.power.readOp.leakage + w2.power.readOp.leakage);
power.readOp.gate_leakage = n_inp * n_out * flit_size * (
cmos_Ig_leakage(g_tp.min_w_nmos_ * TriS2 * 2, min_w_pmos * TriS2 * 2,
1, inv) * Vdd +
cmos_Ig_leakage(g_tp.min_w_nmos_ * TriS1 * 3, min_w_pmos * TriS1 * 3,
2, nand) * Vdd +
cmos_Ig_leakage(g_tp.min_w_nmos_ * TriS1 * 3, min_w_pmos * TriS1 * 3,
2, nor) * Vdd +
w1.power.readOp.gate_leakage + w2.power.readOp.gate_leakage);
// delay calculation
double l_eff = n_inp * flit_size * g_tp.wire_outside_mat.pitch;
Wire wdriver(g_ip->wt, l_eff);
double res = g_tp.wire_outside_mat.R_per_um * (area.w + area.h) +
tr_R_on(g_tp.min_w_nmos_ * wdriver.repeater_size, NCH, 1);
double cap = g_tp.wire_outside_mat.C_per_um * (area.w + area.h) + n_out *
tri_inp_cap + n_inp * tri_out_cap;
delay = horowitz(w1.signal_rise_time(), res * cap, deviceType->Vth /
deviceType->Vdd, deviceType->Vth / deviceType->Vdd, RISE);
Wire wreset();
}
ext: McPAT interface changes and fixes This patch includes software engineering changes and some generic bug fixes Joel Hestness and Yasuko Eckert made to McPAT 0.8. There are still known issues/concernts we did not have a chance to address in this patch. High-level changes in this patch include: 1) Making XML parsing modular and hierarchical: - Shift parsing responsibility into the components - Read XML in a (mostly) context-free recursive manner so that McPAT input files can contain arbitrary component hierarchies 2) Making power, energy, and area calculations a hierarchical and recursive process - Components track their subcomponents and recursively call compute functions in stages - Make C++ object hierarchy reflect inheritance of classes of components with similar structures - Simplify computeArea() and computeEnergy() functions to eliminate successive calls to calculate separate TDP vs. runtime energy - Remove Processor component (now unnecessary) and introduce a more abstract System component 3) Standardizing McPAT output across all components - Use a single, common data structure for storing and printing McPAT output - Recursively call print functions through component hierarchy 4) For caches, allow splitting data array and tag array reads and writes for better accuracy 5) Improving the usability of CACTI by printing more helpful warning and error messages 6) Minor: Impose more rigorous code style for clarity (more work still to be done) Overall, these changes greatly reduce the amount of replicated code, and they improve McPAT runtime and decrease memory footprint.
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void Crossbar::print_crossbar() {
cout << "\nCrossbar Stats (" << n_inp << "x" << n_out << ")\n\n";
cout << "Flit size : " << flit_size << " bits" << endl;
cout << "Width : " << area.w << " u" << endl;
cout << "Height : " << area.h << " u" << endl;
cout << "Dynamic Power : " << power.readOp.dynamic*1e9 *
MIN(n_inp, n_out) << " (nJ)" << endl;
cout << "Leakage Power : " << power.readOp.leakage*1e3 << " (mW)"
<< endl;
cout << "Gate Leakage Power : " << power.readOp.gate_leakage*1e3
<< " (mW)" << endl;
cout << "Crossbar Delay : " << delay*1e12 << " ps\n";
}