added comments and @author
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6 changed files with 137 additions and 39 deletions
159
apps/membench.c
159
apps/membench.c
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@ -16,8 +16,10 @@
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*
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* This file is part of MetalSVM.
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*/
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/*
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* Based on:
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/**
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* @author Steffen Vogel <steffen.vogel@rwth-aachen.de>
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*
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* Based on:
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* www.cs.berkeley.edu/~richie/bebop/notes/matmul/files/membench/
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*/
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@ -28,67 +30,146 @@
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#include <asm/processor.h>
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#include <asm/pmc.h>
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#define SAMPLES 40
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#define CLKS 1e9
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#define RANGE_MIN 1024 /* 1 KiB */
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#define RANGE_MAX (16*1024*1024) /* 16 MiB */
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#define SAMPLES 1000
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#define CLKS 1000000000L
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#define STRIDE_MIN 1
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#define RANGE_MIN (32) /* 32 Byte */
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#define RANGE_MAX (32*1024*1024) /* 32 MiB */
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#define FLUSH 1
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static inline void warmup(char* memory)
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{
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#ifdef FLUSH
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tlb_flush();
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flush_cache();
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#else
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int index;
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for (index = 0; index < RANGE_MAX; index++) {
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memory[index] = 0;
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}
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#endif
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}
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int membench(void* arg)
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{
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kprintf("======= Starting membench\n");
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/* Init PMCs */
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struct pmc_caps* cap = pmc_init();
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kprintf("PMC architecural version: %u\n", cap->version);
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kprintf("There are %u general purpose PMCs (%u bit wide) available\n", cap->gp_count, cap->gp_width);
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kprintf("There are %u fixed function PMCs (%u bit wide) available\n", cap->ff_count, cap->ff_width);
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int i;
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uint16_t tests[][2] = {
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#if 0
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{PMC_EVT_MEM_LOAD_RETIRED_DTLB_MISS, 0}
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{PMC_EVT_MEM_LOAD_RETIRED_L1D_MISS, 0}
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{PMC_EVT_MEM_LOAD_RETIRED_L2_MISS, 0}
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#elif 0
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{PMC_EVT_PAGE_WALK_CLKS, PMC_EVT_PAGE_WALK_COUNT}
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#else
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{PMC_EVT_DTLB_MISS_ANY, PMC_EVT_DTLB_MISS_LD},
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{PMC_EVT_DTLB_MISS_ANY, PMC_EVT_DTLB_MISS_L0_LD},
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{PMC_EVT_DTLB_MISS_ANY, PMC_EVT_DTLB_MISS_ST},
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#endif
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};
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char *memory = palloc(RANGE_MAX, 0);
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kprintf("Allocated test memory: %#lx bytes at %p\n", RANGE_MAX, memory);
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kprintf("%12s%12s%12s%12s\n", "reads", "range", "stride", "clks");
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kprintf("#%12s%12s%12s%12s%12s%12s\n", "range", "stride", "steps", "runs", "reads", "results");
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irq_disable();
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/* Setup PMCs */
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pmc_stop_all();
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pmc_ff_config(1, PMC_FIXED_OS); // CPU_CLK_UNHALTED.CORE
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/* Variables for PMC values */
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uint64_t gp[2], ff[3];
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uint64_t gp_ovh[2], ff_ovh[3];
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int64_t gp_real[2], ff_real[3];
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uint64_t run, steps, tsteps, index, runs, reads;
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uint64_t range, stride;
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volatile char temp;
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/* Run the timing experiments */
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register uint64_t range, stride;
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for (range = RANGE_MIN; range <= RANGE_MAX; range *= 2) {
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for (stride = 1; stride < range/2; stride *= 2) {
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register uint64_t t0, t1, t2;
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register uint64_t run, steps, tsteps, temp, index;
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for (stride = STRIDE_MIN; stride < range; stride *= 2) {
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runs = SAMPLES * stride / range + 1;
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/* Time the loop with strided access + loop overhead */
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steps = 0;
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tsteps = 0;
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for (i = 0; i < sizeof(tests) / 4; i++) {
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pmc_gp_config(0, tests[i][0], PMC_EVTSEL_OS | PMC_EVTSEL_EN, 0, 0);
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pmc_gp_config(1, tests[i][1], PMC_EVTSEL_OS | PMC_EVTSEL_EN, 0, 0);
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// TODO: setup and start PMCs
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steps = 0;
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tsteps = 0;
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t0 = rdtsc();
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do {
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for (run = 0; run < SAMPLES; run++) {
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for (index = 0; index < range; index += stride) {
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memory[index]++;
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/* Time the loop with strided access + loop overhead */
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warmup(memory);
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pmc_reset_all();
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pmc_start_all();
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do {
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for (run = 0; run < runs; run++) {
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for (index = 0; index < range; index += stride) {
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temp = memory[index];
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}
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}
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}
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steps++;
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t1 = rdtsc() - t0;
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} while (t1 < CLKS);
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steps++;
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} while (pmc_ff_read(1) < CLKS);
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// TODO: read and stop PMCs
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pmc_stop_all();
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/* Try to time just the overheads */
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t0 = rdtsc();
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do {
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for (run = 0; run < SAMPLES; run++) {
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for (index = 0; index < range; index += stride) {
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temp++;
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gp[0] = pmc_gp_read(0);
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gp[1] = pmc_gp_read(1);
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ff[1] = pmc_ff_read(1);
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/* Try to time just the overheads */
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warmup(memory);
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pmc_reset_all();
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pmc_start_all();
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do {
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for (run = 0; run < runs; run++) {
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for (index = 0; index < range; index += stride) {
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temp++;
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}
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}
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}
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tsteps++;
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t2 = rdtsc() - t0;
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} while (tsteps < steps);
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tsteps++;
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} while (tsteps < steps);
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pmc_stop_all();
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/* Report on the average time per read/write */
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int64_t clks = t1 - t2;
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uint64_t reads = SAMPLES * steps * range / stride;
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gp_ovh[0] = pmc_gp_read(0);
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gp_ovh[1] = pmc_gp_read(1);
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ff_ovh[1] = pmc_ff_read(1);
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kprintf("%12d%12d%12d%12llu\n", reads, range, stride, 1000 * clks / reads);
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gp_real[0] = gp[0] - gp_ovh[0];
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gp_real[1] = gp[1] - gp_ovh[1];
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ff_real[1] = ff[1] - ff_ovh[1];
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reads = runs * steps * range / stride;
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if (i == 0)
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kprintf("%12llu%12llu%12llu%12llu%12llu%12llu", range, stride, steps, runs, reads, ff_real[1]);
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kprintf("%12llu", gp[0]);
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kprintf("%12llu", gp[1]);
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kprintf("\t");
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}
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kprintf("\n");
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}
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kprintf("\n");
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}
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irq_enable();
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return 0;
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}
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* This file is part of MetalSVM.
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*/
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/**
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* @author Steffen Vogel <steffen.vogel@rwth-aachen.de>
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*/
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#include <metalsvm/stdlib.h>
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#include <metalsvm/stdio.h>
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#include <metalsvm/stdarg.h>
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#include <asm/uart.h>
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#include <asm/io.h>
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/**
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* @author Steffen Vogel <steffen.vogel@rwth-aachen.de>
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*/
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static inline int is_transmit_empty()
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{
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return inportb(UART_PORT + 5) & 0x20;
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#include <asm/multiboot.h>
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#include <asm/apic.h>
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/**
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* @author Steffen Vogel <steffen.vogel@rwth-aachen.de>
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*/
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/*
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* Virtual Memory Layout of the standard configuration
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* (1 GB kernel space)
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* This file is part of MetalSVM.
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*/
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/**
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* @author Steffen Vogel <steffen.vogel@rwth-aachen.de>
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*/
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#ifndef __MALLOC_H__
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#define __MALLOC_H__
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/**
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* @author Stefan Lankes
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* @author Steffen Vogel <steffen.vogel@rwth-aachen.de>
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* @file include/metalsvm/vma.h
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* @brief VMA related sructure and functions
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*/
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