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Benchmark signal delivery

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This commit is contained in:
Justine Tunney 2022-08-05 15:01:13 -07:00
parent 449fb2fb59
commit db8217b37b
2 changed files with 61 additions and 5 deletions
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10
libc/str/bcmp.c
View file

@ -23,7 +23,7 @@
typedef uint64_t xmm_t __attribute__((__vector_size__(16), __aligned__(1))); typedef uint64_t xmm_t __attribute__((__vector_size__(16), __aligned__(1)));
static dontinline antiquity int memcmp_sse(const char *p, const char *q, static dontinline antiquity int bcmp_sse(const char *p, const char *q,
size_t n) { size_t n) {
xmm_t a; xmm_t a;
while (n > 32) { while (n > 32) {
@ -38,8 +38,8 @@ static dontinline antiquity int memcmp_sse(const char *p, const char *q,
return !!(a[0] | a[1]); return !!(a[0] | a[1]);
} }
microarchitecture("avx") static int memcmp_avx(const char *p, const char *q, microarchitecture("avx") static int bcmp_avx(const char *p, const char *q,
size_t n) { size_t n) {
xmm_t a, b, c, d; xmm_t a, b, c, d;
if (n > 32) { if (n > 32) {
if (n >= 16 + 64) { if (n >= 16 + 64) {
@ -123,9 +123,9 @@ int bcmp(const void *a, const void *b, size_t n) {
return !!(i ^ j); return !!(i ^ j);
} }
} else if (LIKELY(X86_HAVE(AVX))) { } else if (LIKELY(X86_HAVE(AVX))) {
return memcmp_avx(p, q, n); return bcmp_avx(p, q, n);
} else { } else {
return memcmp_sse(p, q, n); return bcmp_sse(p, q, n);
} }
} }
while (n--) { while (n--) {

56
test/libc/calls/signal_test.c
View file

@ -21,7 +21,9 @@
#include "libc/log/check.h" #include "libc/log/check.h"
#include "libc/log/log.h" #include "libc/log/log.h"
#include "libc/runtime/runtime.h" #include "libc/runtime/runtime.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h" #include "libc/sysv/consts/sig.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h" #include "libc/testlib/testlib.h"
testonly void OnUsr1(int sig) { testonly void OnUsr1(int sig) {
@ -38,3 +40,57 @@ TEST(signal, test) {
ASSERT_NE(-1, raise(SIGUSR1)); ASSERT_NE(-1, raise(SIGUSR1));
__die(); __die();
} }
////////////////////////////////////////////////////////////////////////////////
// signal round-trip delivery takes about 1µs
void OnSigTrap(int sig, struct siginfo *si, struct ucontext *ctx) {
}
void TrapBench(int n) {
for (int i = 0; i < n; ++i) {
asm("int3");
}
}
BENCH(signal, trapBench) {
struct sigaction old;
struct sigaction sabus = {.sa_sigaction = OnSigTrap};
ASSERT_SYS(0, 0, sigaction(SIGTRAP, &sabus, &old));
EZBENCH_N("signal trap", 16, TrapBench(16));
EZBENCH_N("signal trap", 256, TrapBench(256));
EZBENCH_N("signal trap", 1024, TrapBench(1024));
sigaction(SIGTRAP, &old, 0);
}
BENCH(signal, trapBenchSiginfo) {
struct sigaction old;
struct sigaction sabus = {.sa_sigaction = OnSigTrap, .sa_flags = SA_SIGINFO};
ASSERT_SYS(0, 0, sigaction(SIGTRAP, &sabus, &old));
EZBENCH_N("siginfo trap", 16, TrapBench(16));
EZBENCH_N("siginfo trap", 256, TrapBench(256));
EZBENCH_N("siginfo trap", 1024, TrapBench(1024));
sigaction(SIGTRAP, &old, 0);
}
void OnSigHlt(int sig, struct siginfo *si, struct ucontext *ctx) {
ctx->uc_mcontext.rip += 1;
}
void HltBench(int n) {
for (int i = 0; i < n; ++i) {
asm("hlt");
}
}
BENCH(signal, hltBenchSiginfo) {
struct sigaction old[2];
struct sigaction sabus = {.sa_sigaction = OnSigHlt, .sa_flags = SA_SIGINFO};
ASSERT_SYS(0, 0, sigaction(SIGSEGV, &sabus, old + 0));
ASSERT_SYS(0, 0, sigaction(SIGBUS, &sabus, old + 1));
EZBENCH_N("siginfo hlt", 16, HltBench(16));
EZBENCH_N("siginfo hlt", 256, HltBench(256));
EZBENCH_N("siginfo hlt", 1024, HltBench(1024));
sigaction(SIGSEGV, old + 0, 0);
sigaction(SIGBUS, old + 1, 0);
}