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Fix peak performance in KNL

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Dr-Noob
2020-10-20 21:13:04 +02:00
parent f992d0122f
commit 5cc9038f3d
4 changed files with 13 additions and 1 deletions
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6
src/cpuid.c
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@@ -761,6 +761,11 @@ char* get_str_peak_performance(struct cpuInfo* cpu, struct topology* topo, int64
flops = flops*8; flops = flops*8;
else if(cpu->SSE) else if(cpu->SSE)
flops = flops*4; flops = flops*4;
// See https://sites.utexas.edu/jdm4372/2018/01/22/a-peculiar-
// throughput-limitation-on-intels-xeon-phi-x200-knights-landing/
if(is_knights_landing(cpu))
flops = flops * 6 / 7;
if(flops >= (double)1000000000000.0) if(flops >= (double)1000000000000.0)
snprintf(string,size,"%.2f TFLOP/s",flops/1000000000000); snprintf(string,size,"%.2f TFLOP/s",flops/1000000000000);
@@ -768,6 +773,7 @@ char* get_str_peak_performance(struct cpuInfo* cpu, struct topology* topo, int64
snprintf(string,size,"%.2f GFLOP/s",flops/1000000000); snprintf(string,size,"%.2f GFLOP/s",flops/1000000000);
else else
snprintf(string,size,"%.2f MFLOP/s",flops/1000000); snprintf(string,size,"%.2f MFLOP/s",flops/1000000);
return string; return string;
} }

2
src/main.c
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@@ -6,7 +6,7 @@
#include "cpuid.h" #include "cpuid.h"
#include "global.h" #include "global.h"
static const char* VERSION = "0.71"; static const char* VERSION = "0.72";
void print_help(char *argv[]) { void print_help(char *argv[]) {
printf("Usage: %s [--version] [--help] [--levels] [--style \"fancy\"|\"retro\"|\"legacy\"] [--color \"intel\"|\"amd\"|'R,G,B:R,G,B:R,G,B:R,G,B']\n\n\ printf("Usage: %s [--version] [--help] [--levels] [--style \"fancy\"|\"retro\"|\"legacy\"] [--color \"intel\"|\"amd\"|'R,G,B:R,G,B:R,G,B:R,G,B']\n\n\

5
src/uarch.c
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@@ -352,6 +352,11 @@ struct uarch* get_uarch_from_cpuid(struct cpuInfo* cpu, uint32_t ef, uint32_t f,
bool vpus_are_AVX512(struct cpuInfo* cpu) { bool vpus_are_AVX512(struct cpuInfo* cpu) {
return cpu->arch->uarch != UARCH_ICE_LAKE; return cpu->arch->uarch != UARCH_ICE_LAKE;
return cpu->arch->uarch != UARCH_ICE_LAKE;
}
bool is_knights_landing(struct cpuInfo* cpu) {
return cpu->arch->uarch == UARCH_KNIGHTS_LANDING;
} }
int get_number_of_vpus(struct cpuInfo* cpu) { int get_number_of_vpus(struct cpuInfo* cpu) {

1
src/uarch.h
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@@ -9,6 +9,7 @@ struct uarch;
struct uarch* get_uarch_from_cpuid(struct cpuInfo* cpu, uint32_t ef, uint32_t f, uint32_t em, uint32_t m, int s); struct uarch* get_uarch_from_cpuid(struct cpuInfo* cpu, uint32_t ef, uint32_t f, uint32_t em, uint32_t m, int s);
bool vpus_are_AVX512(struct cpuInfo* cpu); bool vpus_are_AVX512(struct cpuInfo* cpu);
bool is_knights_landing(struct cpuInfo* cpu);
int get_number_of_vpus(struct cpuInfo* cpu); int get_number_of_vpus(struct cpuInfo* cpu);
char* get_str_uarch(struct cpuInfo* cpu); char* get_str_uarch(struct cpuInfo* cpu);
char* get_str_process(struct cpuInfo* cpu); char* get_str_process(struct cpuInfo* cpu);