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Write some lock contention tests

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This commit is contained in:
Justine Tunney 2022-06-16 09:06:09 -07:00
parent 42c38bc3e3
commit c06ffd458c
19 changed files with 205 additions and 76 deletions
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99
test/libc/intrin/pthread_mutex_lock_test.c
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@ -22,7 +22,9 @@
#include "libc/intrin/kprintf.h"
#include "libc/intrin/pthread.h"
#include "libc/intrin/spinlock.h"
#include "libc/intrin/wait0.internal.h"
#include "libc/nexgen32e/threaded.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/stack.h"
#include "libc/sysv/consts/clone.h"
@ -32,24 +34,23 @@
#include "libc/testlib/testlib.h"
#include "libc/thread/thread.h"
static char tls[64];
#define THREADS 8
#define ITERATIONS 512
int PutProcessInThreadingMode(void *p) {
return 0;
}
char *stack[THREADS];
char tls[THREADS][64];
void SetUp(void) {
clone(PutProcessInThreadingMode,
mmap(0, GetStackSize(), PROT_READ | PROT_WRITE,
MAP_STACK | MAP_ANONYMOUS, -1, 0),
GetStackSize(),
CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
CLONE_SETTLS,
0, 0, __initialize_tls(tls), sizeof(tls), 0);
__attribute__((__constructor__)) void init(void) {
__enable_tls();
__enable_threads();
}
TEST(pthread_mutex_lock, normal) {
pthread_mutex_t lock;
pthread_mutexattr_t attr;
ASSERT_EQ(0, pthread_mutexattr_init(&attr));
ASSERT_EQ(0, pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL));
ASSERT_EQ(0, pthread_mutex_init(&lock, &attr));
ASSERT_EQ(0, pthread_mutex_init(&lock, 0));
ASSERT_EQ(0, pthread_mutex_lock(&lock));
ASSERT_EQ(0, pthread_mutex_unlock(&lock));
@ -89,6 +90,78 @@ TEST(pthread_mutex_lock, errorcheck) {
ASSERT_EQ(0, pthread_mutexattr_destroy(&attr));
}
int count;
_Atomic(int) finished;
_Alignas(64) char slock;
pthread_mutex_t lock;
int MutexWorker(void *p) {
int i;
for (i = 0; i < ITERATIONS; ++i) {
pthread_mutex_lock(&lock);
++count;
pthread_mutex_unlock(&lock);
}
return 0;
}
TEST(pthread_mutex_lock, contention) {
int i;
count = 0;
for (i = 0; i < THREADS; ++i) {
clone(MutexWorker,
(stack[i] = mmap(0, GetStackSize(), PROT_READ | PROT_WRITE,
MAP_STACK | MAP_ANONYMOUS, -1, 0)),
GetStackSize(),
CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID | CLONE_SETTLS,
0, 0, __initialize_tls(tls[i]), sizeof(tls[i]),
(int *)(tls[i] + 0x38));
}
for (i = 0; i < THREADS; ++i) {
_wait0((int *)(tls[i] + 0x38));
}
ASSERT_EQ(THREADS * ITERATIONS, count);
for (i = 0; i < THREADS; ++i) {
munmap(stack[i], GetStackSize());
}
}
int SpinlockWorker(void *p) {
int i;
for (i = 0; i < ITERATIONS; ++i) {
_spinlock(&slock);
++count;
_spunlock(&slock);
}
++finished;
return 0;
}
TEST(_spinlock, contention) {
int i;
count = 0;
finished = 0;
for (i = 0; i < THREADS; ++i) {
clone(SpinlockWorker,
(stack[i] = mmap(0, GetStackSize(), PROT_READ | PROT_WRITE,
MAP_STACK | MAP_ANONYMOUS, -1, 0)),
GetStackSize(),
CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID | CLONE_SETTLS,
0, 0, __initialize_tls(tls[i]), sizeof(tls[i]),
(int *)(tls[i] + 0x38));
}
for (i = 0; i < THREADS; ++i) {
_wait0((int *)(tls[i] + 0x38));
}
ASSERT_EQ(THREADS, finished);
ASSERT_EQ(THREADS * ITERATIONS, count);
for (i = 0; i < THREADS; ++i) {
munmap(stack[i], GetStackSize());
}
}
BENCH(pthread_mutex_lock, bench) {
char schar = 0;
pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
@ -100,4 +173,6 @@ BENCH(pthread_mutex_lock, bench) {
(_spinlock_tiny(&schar), _spunlock(&schar)));
EZBENCH2("_spinlock_coop", donothing,
(_spinlock_cooperative(&schar), _spunlock(&schar)));
EZBENCH2("content mut", donothing, pthread_mutex_lock_contention());
EZBENCH2("content spin", donothing, _spinlock_contention());
}